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The influence of moisture, temperature, coal rank, and differential enthalpy on the methane (CH4) and carbon dioxide (CO2) sorption capacity of coals of different rank has been investigated by using high-pressure sorption isotherms at 303, 318, and 333 K (CH4) and 318, 333, and 348 K (CO2), respectively. The variation of sorption capacity was studied as a function of burial depth of coal seams using the corresponding Langmuir parameters in combination with a geothermal gradient of 0.03 K/m and a normal hydrostatic pressure gradient. Taking the gas content corresponding to 100% gas saturation at maximum burial depth as a reference value, the theoretical CH4 saturation after the uplift of the coal seam was computed as a function of depth. According to these calculations, the change in sorption capacity caused by changing pressure, temperature conditions during uplift will lead consistently to high saturation values. Therefore, the commonly observed undersaturation of coal seams is most likely related to dismigration (losses into adjacent formations and atmosphere). Finally, we attempt to identify sweet spots for CO2-enhanced coalbed methane (CO2-ECBM) production. The CO2-ECBM is expected to become less effective with increasing depth because the CO2-to-CH4 sorption capacity ratio decreases with increasing temperature and pressure. Furthermore, CO2-ECBM efficiency will decrease with increasing maturity because of the highest sorption capacity ratio and affinity difference between CO2 and CH4 for low mature coals.

Show more American Association of Petroleum Geologists (AAPG)
Desktop /Portals/0/PackFlashItemImages/WebReady/Bulletin-cover-Feb-14-400px.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Gas saturation and CO2 enhancement potential of coalbed methane reservoirs as a function of depth
 

The origin of thermogenic natural gas in the shallow stratigraphy of northeastern Pennsylvania is associated, in part, with interbedded coal identified in numerous outcrops of the Upper Devonian Catskill and Lock Haven Formations. Historically documented and newly identified locations of Upper Devonian coal stringers are shown to be widespread, both laterally across the region and vertically throughout the stratigraphic section of the Catskill and Lock Haven Formations. Coal samples exhibited considerable gas source potential with total organic carbon as high as 44.40% by weight, with a mean of 13.66% for 23 sample locations analyzed. Upper Devonian coal is thermogenically mature; calculated vitrinite reflectances range from 1.25% to 2.89%, with most samples falling within the dry-gas window. Source potential is further supported by gas shows observed while drilling through shallow, identifiable coal horizons, which are at times located within fresh groundwater aquifers. Thermogenic gas detected in area water wells during predrill baseline sampling is determined not only to be naturally occurring, but also common in the region.

Show more American Association of Petroleum Geologists (AAPG)
Desktop /Portals/0/PackFlashItemImages/WebReady/geologic-and-baseline-groundwater-evidence-for.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Geologic and baseline groundwater evidence for naturally occurring, shallowly sourced, thermogenic gas in northeastern Pennsylvania
 

Not oil, not shale, but a huge resource! Industry interest in developing oil shale production technology rises and falls with oil prices and the availability of cheaper options. Shale oil in formations like the Bakken is currently more economically attractive and less risky. Chevron, Shell and Exxon-Mobil have ended their oil shale projects in the past year, but Red Leaf Resources is moving ahead.

American Association of Petroleum Geologists (AAPG)
Desktop /Portals/0/PackFlashItemImages/WebReady/oil-shale-may-almost-be-commercial-or-not-2014-01jan.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Oil Shale May Almost Be Commercial, or Not
 

Using examples from shale reservoirs worldwide, I demonstrate the diversity of shale-hosted fracture systems and present evidence for how and why various fractures systems form. Core and outcrop observations, strength tests on shale and on fractures in core, and geomechanical models allow prediction of fracture patterns and attributes that can be taken into account in well placement and hydraulic fracture treatment design. Both open and sealed fractures can interact with and modify hydraulic fracture size and shape. Open fractures can enhance reservoir permeability but may conduct treatment fluids great distances, in some instances possibly aseismically.

Show more American Association of Petroleum Geologists (AAPG)
Desktop /Portals/0/images/_site/AAPG-newlogo-vertical-morepadding.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Natural Fractures in Shale Hydrocarbon Reservoirs
 

Hydrocarbon exploration beneath the shallow allochthonous salt canopy of the ultra-deepwater central Gulf of Mexico has encountered three thick, sand-rich, submarine fan successions that punctuate an otherwise relatively condensed and fine-grained basin center stratigraphy. These sand-rich fans are Late Paleocene, Early Miocene, and Middle Miocene in age and each coincide with periods of very high sediment flux and basin margin instability. They are the primary exploration targets in most ultra-deepwater fields, recent discoveries, and failed exploration tests.

Show more American Association of Petroleum Geologists (AAPG)
Desktop /Portals/0/images/_site/AAPG-newlogo-vertical-morepadding.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true The Influence of Salt Structures and Salt Deformation on Petroleum Exploration in the Deep-water Northern Gulf of Mexico
 
Desktop /Portals/0/images/_site/AAPG-newlogo-vertical-morepadding.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Diagenetic Controls on Reservoir Quality in Deep to Ultradeep Paleogene Wilcox Sandstones, Gulf of Mexico
 

The following short course option was developed for geology and geophysics students that have not had much exposure to how geoscience is applied in industry. It can be tailored for undergraduate juniors and seniors or graduate students. The agenda can be modified to meet specific needs and time constraints. Contact the presenter to discuss options.

Show more American Association of Petroleum Geologists (AAPG)
Desktop /Portals/0/images/_site/AAPG-newlogo-vertical-morepadding.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Short Course Lecture Geology & Geophysics Applied to Industry
 

The recent National Academies’ Institute of Medicine (IOM) report on its late-April 2012 workshop, “Health Impact Assessment of Shale Gas Extraction,” describes many potential health impacts of shale gas development and identifies the data gaps.

American Association of Petroleum Geologists (AAPG)
Desktop /Portals/0/PackFlashItemImages/WebReady/EXPLORER-cover-2014-01jan-thumb.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Report Shows Need for Data in Health Debate
 

New geosteering tools are helping to drive eye-raising crude oil production levels in the Bakken shale play.

American Association of Petroleum Geologists (AAPG)
Desktop /Portals/0/PackFlashItemImages/WebReady/3d-seismic-drives-geosteering-advances-hero.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true 3-D Seismic Drives Geosteering Advances
 

The second annual Playmaker Forum will build on the success of last year’s event, offering professional development, networking, and tricks of the trade from some of the best oil finders in the world.

American Association of Petroleum Geologists (AAPG)
Desktop /Portals/0/PackFlashItemImages/WebReady/sternbach-charles.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Veterans will share success secrets Popular Playmaker Forum Returns to Houston
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In-Person Training
Austin Texas United States 23 July, 2017 23 July, 2017 39084 Desktop /Portals/0/PackFlashItemImages/WebReady/URTeC2017-hero-955x400.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Member, Geochemistry and Basin Modeling, Oil and Gas Analysis, Shale Gas
 
Austin, Texas, United States
23 July 2017

This class is designed to give attendees a better understanding of unconventional “shale” hydrocarbon reservoirs, based on the geology, detailed mineralogy, organic-richness, and hydrocarbon content and demonstrate (with examples) various ways for collaboration between petrophysicists and other disciplines to achieve efficient unconventional asset development through better understanding of lateral landing selection and proper completion optimization designs.

Cape Town Western Cape South Africa 20 June, 2017 23 June, 2017 38348 Desktop /Portals/0/PackFlashItemImages/WebReady/gtw-ar-exploration-and-development-of-unconventional-hydrocarbon-hero.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Alternative Resources, Coal, Business and Economics, Economics, Resource Estimates, Risk Analysis, Engineering, Development and Operations, Conventional Drilling, Infill Drilling, Drive Mechanisms, Production, Depletion Drive, Hydraulic Fracturing, Primary Recovery, Secondary Recovery, Gas Injection, Water Flooding, Tertiary Recovery, Chemical Flooding Processes, Miscible Recovery, Thermal Recovery Processes, Reservoir Characterization, Environmental, Ground Water, Monitoring, Natural Resources, Pollution, Water Resources, Geochemistry and Basin Modeling, Basin Modeling, Maturation, Migration, Oil and Gas Analysis, Oil Seeps, Petroleum Systems, Source Rock, Thermal History, Oil Shale
 
Cape Town, Western Cape, South Africa
20-23 June 2017

This workshop provides the opportunity to learn and discuss the latest knowledge, techniques & technologies applied to unconventional reservoirs which can be utilized to explore for and develop these reservoirs. The workshop will provide a set-up for networking, interacting & sharing expertise with fellow petroleum scientists interested in developing and producing unconventional hydrocarbon resources.

Cape Town Western Cape South Africa 22 June, 2017 23 June, 2017 38474 Desktop /Portals/0/PackFlashItemImages/WebReady/fs-the-karoo-basin-hero.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Alternative Resources, Geochemistry and Basin Modeling, Business and Economics, Engineering, Environmental, Basin Modeling, Source Rock, Migration, Petroleum Systems, Thermal History, Oil Seeps, Oil and Gas Analysis, Maturation, Resource Estimates, Risk Analysis, Economics, Reservoir Characterization, Development and Operations, Production, Oil Shale, Coal, Conventional Drilling, Infill Drilling, Hydraulic Fracturing, Primary Recovery, Secondary Recovery, Water Flooding, Gas Injection, Tertiary Recovery, Chemical Flooding Processes, Thermal Recovery Processes, Miscible Recovery, Drive Mechanisms, Depletion Drive, Ground Water, Water Resources, Monitoring, Pollution, Natural Resources
 
Cape Town, Western Cape, South Africa
22-23 June 2017

Led by De Ville Wickens (Geo-Routes Petroleum, Cape Town) and Doug Cole (Council for Geoscience, Bellville)

Participants of this field excursion will be introduced to the stratigraphy of the southwestern Karoo Basin by visiting the prime outcrop areas of the Dwyka and Ecca Groups in the Laingsburg and Tanqua Karoo regions. The southwestern Karoo Basin hosts a considerable amount of information on glaciogenic, deep-water and deltaic sedimentation with present day erosion allowing 3D-viewing of laterally continuous (tens of kilometres) outcrops. The Ecca Group in these areas, for example, hosts the world's best examples of deep-water basin floor to slope fan complexes, making it the most sought after “open air laboratory” for studying fine-grained deep-water sedimentation.

The objective of this field trip is to gain a better understanding of the tectono-sedimentary history and stratigraphic evolution of southwestern part of the Karoo Basin, basic depositional processes, facies development, controls on sedimentation patterns and post-depositional diagenetic and structural changes. It further aims to integrate different scales of observation and interpretation, namely the basin (exploration) and the development and production scale (facies distribution and bed-scale stratigraphy). This two-day field trip will focus on show-casing the glaciogenic Dwyka Group, and the Prince Albert and Whitehill Formations of the Ecca Group, which are main targets for shale gas development in South Africa.

Rio de Janeiro Brazil 22 August, 2017 23 August, 2017 38190 Desktop /Portals/0/PackFlashItemImages/WebReady/gtw-lacr-optimization-of-e-p-projects-integrating-geosciences-and-engineering-from-block-acquisition-through-production-hero.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Development and Operations, Engineering, Infill Drilling, Directional Drilling, Coring, Conventional Drilling, Reservoir Characterization, Geochemistry and Basin Modeling, Basin Modeling, Petroleum Systems, Geophysics, Seismic, Petrophysics and Well Logs, Fractured Carbonate Reservoirs, Stratigraphic Traps, Subsalt Traps
 
Rio de Janeiro, Brazil
22-23 August 2017

AAPG and ABGP invite you to participate in an interactive, multidisciplinary workshop featuring presentations and discussions exploring opportunities to improve companies’ efficiency and effectiveness throughout the E&P cycle, from block acquisition and exploration to development and production.

Georgetown Barima-Waini Guyana 09 November, 2017 10 November, 2017 38161 Desktop /Portals/0/PackFlashItemImages/WebReady/sc-lacr-reservoir-characterization-of-deep-water-systems-impact-from-exploration-to-production-hero.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Business and Economics, Risk Analysis, Production, Engineering, Primary Recovery, Secondary Recovery, Geochemistry and Basin Modeling, Petroleum Systems, Petrophysics and Well Logs, Clastics, Sedimentology and Stratigraphy, Conventional Sandstones, Deep Sea / Deepwater, Deepwater Turbidites, Low Stand Deposits, Marine, Regressive Deposits, Slope, Structure, Tectonics (General), Deep Basin Gas, Shale Gas, Stratigraphic Traps, Tight Gas Sands
 
Georgetown, Barima-Waini, Guyana
9-10 November 2017

This course emphasizes key changes in reservoir models that have a major impact in exploration and production of these reservoirs. The course will include lectures, exercises, and observations from cores, well logs and seismic profiles. Participants will learn how to interpret and map environments of deposition (EoD’s) in deep water systems and understand how the different EoD’s and sub-EoD’s behave as reservoirs.

Marrakech Morocco 01 November, 2017 04 November, 2017 37903 Desktop /Portals/0/PackFlashItemImages/WebReady/gtw-afr-the-paleozoic-hydrocarbon-potential-of-north-africa-past-lessons-and-future-potential-2017-17apr17-hero.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Engineering, Development and Operations, Production, Infill Drilling, Geochemistry and Basin Modeling, Petroleum Systems, Source Rock, Thermal History, Geophysics, Clastics, Sedimentology and Stratigraphy, Conventional Sandstones, Sequence Stratigraphy, Structure, Compressional Systems, Extensional Systems, Tectonics (General), Deep Basin Gas, Stratigraphic Traps, Structural Traps
 
Marrakech, Morocco
1-4 November 2017

This workshop provides the opportunity to learn and discuss the latest knowledge, techniques & technologies applied to petroleum reservoirs in the Paleozoic of North Africa which can be utilized to explore for and develop these reservoirs. The workshop will provide a set-up for networking, interacting & sharing expertise with fellow petroleum scientists interested in developing and producing hydrocarbon resources within the Paleozoic of North Africa.

Saskatoon Saskatchewan Canada 18 November, 2016 18 November, 2016 34465 Desktop /Portals/0/PackFlashItemImages/WebReady/dl-kitty-milliken-univ-saskatchewan-hero.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Student, Engineering, Reservoir Characterization, Geochemistry and Basin Modeling, Source Rock, Sedimentology and Stratigraphy, Oil Shale, Shale Gas
 
Saskatoon, Saskatchewan, Canada
18 November 2016

Short Course: “Micro to Nano-Scale Features of Mudrocks”
Lecture Title: “Mudrocks (shales, mudstones) at the Scale of Grains and Pores: Current Understanding.”
Venue: University of Saskatchewan, Department of Geological Sciences, 114 Science Place, Saskatoon, SK SK7 3H5
Time: 3:30pm

Saskatoon Saskatchewan Canada 18 November, 2016 18 November, 2016 34482 Desktop /Portals/0/PackFlashItemImages/WebReady/dl-kitty-milliken-univ-saskatchewan-hero.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Geochemistry and Basin Modeling, Sedimentology and Stratigraphy, Engineering, Source Rock, Reservoir Characterization, Oil Shale, Shale Gas, Student
 
Saskatoon, Saskatchewan, Canada
18 November 2016

Short Course: “Micro to Nano-Scale Features of Mudrocks”
Lecture Title: “Mudrocks (shales, mudstones) at the Scale of Grains and Pores: Current Understanding.”
Venue: University of Saskatchewan, Department of Geological Sciences, 114 Science Place, Saskatoon, SK SK7 3H5
Time: 9:00am

Online Training
23 April, 2015 23 April, 2015 16809 Desktop /Portals/0/PackFlashItemImages/WebReady/an-analytical-model-for-shale-gas-permeability-hero.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true
 
23 April 2015
Recent laboratory studies have revealed previously unknown behaviors in shale gas which unlock secrets of permeability and sweet spots in shale gas reservoirs. The presentation presents the findings and also goes into detail about how the new information can be applied in order to potentially improve recovery in reservoirs.
19 March, 2015 19 March, 2015 16283 Desktop /Portals/0/PackFlashItemImages/WebReady/New-Insights-into-the-Stratigraphic-Framework-hero.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true
 
19 March 2015

A detailed biostratigraphic analysis and stratigraphic framework of the Paleocene and Eocene Chicontepec Formation in the Tampico-Misantla basin, onshore eastern Mexico, was conducted using 33 wells.

02 December, 2014 02 December, 2014 11967 Desktop /Portals/0/PackFlashItemImages/WebReady/esymp-multiscale-modeling-of-gas-transport-hero.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true
 
2 December 2014

The gas transport in organic-rich shales involves different length-scales, from organic and inorganic pores to macro- and macrofractures. In order to upscale the fluid transport from nanoscale (flow through nanopores) to larger scales (to micro- and macrofractures), multicontinuum methodology is planned to be used.

30 October, 2014 30 October, 2014 11390 Desktop /Portals/0/PackFlashItemImages/WebReady/sc-kerogen-maturity-determinations.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true
 
30 October 2014

Cross disciplinary workflows play an important part of successful characterization of shale reservoirs. This course discusses how the artificial kerogen maturity of organic-rich Green River shale affects the petrophysical, micro-structural, geochemical and elastic properties.

02 October, 2014 02 October, 2014 10593 Desktop /Portals/0/PackFlashItemImages/WebReady/esymp-concepts-of-scale-horizontal-development-of-wolfcamp-shale-oil-of-the-southern-midland-basin-hero.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true
 
2 October 2014
This course is ideal for individuals involved in Midland Basin exploration and development. Successful development of Wolfcamp shale oil relies on complex inter-relationships (ultimately interdependencies) within and between a wide variety of scientific disciplines, financial entities, and company partnerships. 
01 January, 2014 01 January, 9999 3160 Desktop /Portals/0/PackFlashItemImages/WebReady/oc-toc-strategic-decision-making.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true
 
1 January 2014 - 1 January 9999

Learn to critically evaluate current issues that can impact growth and sustainability of oil and gas ventures.

09 February, 2012 09 February, 2012 1477 Desktop /Portals/0/PackFlashItemImages/WebReady/oc-es-seismic-reservoir-characterization-of-us-shales.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true
 
9 February 2012

Projects in several shales will be discussed, including Marcellus, Eagle Ford, Haynesville, Fayetteville, Montney, and Barnett, as will several seismically-detectable drivers for success including lithofacies, stress, pre-existing fractures, and pore pressure.

29 September, 2011 29 September, 2011 1478 Desktop /Portals/0/PackFlashItemImages/WebReady/oc-es-application-of-inversion-and-clustering-analysis.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true
 
29 September 2011

This study will focus in the combination of λρ – μρ inversion with clustering analysis techniques in order to discriminate brittle zones in the Barnett Shale.

24 October, 2013 24 October, 2013 1499 Desktop /Portals/0/PackFlashItemImages/WebReady/oc-es-geomechanical-data-from-petrophysical-logs.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true
 
24 October 2013

This e-symposium will be introducing signal processing techniques as a means to maximize extracting geomechanical data from petrophysical logs.

20 January, 2012 20 January, 2012 1482 Desktop /Portals/0/PackFlashItemImages/WebReady/oc-es-eagle-ford-shale-prospecting-with-3d-seismic-data.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true
 
20 January 2012

The Eagle Ford Shale in South Texas is one of the more exciting shale plays in the United States at the current time.

Request a Visit
 

Production from unconventional petroleum reservoirs includes petroleum from shale, coal, tight-sand and oil-sand. These reservoirs contain enormous quantities of oil and natural gas but pose a technology challenge to both geoscientists and engineers to produce economically on a commercial scale. These reservoirs store large volumes and are widely distributed at different stratigraphic levels and basin types, offering long-term potential for energy supply. Most of these reservoirs are low permeability and porosity that need enhancement with hydraulic fracture stimulation to maximize fluid drainage. Production from these reservoirs is increasing with continued advancement in geological characterization techniques and technology for well drilling, logging, and completion with drainage enhancement. Currently, Australia, Argentina, Canada, Egypt, USA, and Venezuela are producing natural gas from low permeability reservoirs: tight-sand, shale, and coal (CBM). Canada, Russia, USA, and Venezuela are producing heavy oil from oilsand. USA is leading the development of techniques for exploring, and technology for exploiting unconventional gas resources, which can help to develop potential gas-bearing shales of Thailand.

The main focus is on source-reservoir-seal shale petroleum plays. In these tight rocks petroleum resides in the micro-pores as well as adsorbed on and in the organics. Shale has very low matrix permeability (nano-darcies) and has highly layered formations with differences in vertical and horizontal properties, vertically non-homogeneous and horizontally anisotropic with complicate natural fractures. Understanding the rocks is critical in selecting fluid drainage enhancement mechanisms; rock properties such as where shale is clay or silica rich, clay types and maturation , kerogen type and maturation, permeability, porosity, and saturation. Most of these plays require horizontal development with large numbers of wells that require an understanding of formation structure, setting and reservoir character and its lateral extension.

The quality of shale-gas resources depend on thickness of net pay (>100 m), adequate porosity (>2%), high reservoir pressure (ideally overpressure), high thermal maturity (>1.5% Ro), high organic richness (>2% TOC), low in clay (<50%), high in brittle minerals (quartz, carbonates, feldspars), and favourable in-situ stress.

During the past decade, unconventional shale and tight-sand gas plays have become an important supply of natural gas in the US, and now in shale oil as well. As a consequence, interest to assess and explore these plays is rapidly spreading worldwide. The high production potential of shale petroleum resources has contributed to a comparably favourable outlook for increased future petroleum supplies globally.

Application of 2D and 3D seismic for defining reservoirs and micro seismic for monitoring fracturing, measuring rock properties downhole (borehole imaging) and in laboratory (mineralogy, porosity, permeability), horizontal drilling (downhole GPS), and hydraulic fracture stimulation (cross-linked gel, slick-water, nitrogen or nitrogen foam) is key in improving production from these huge resources with low productivity factors.

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