Coming Soon!
Recent Posts
No posts yet.

Seismic correlations and well data confirm that deep-water carbonate beds of Mesozoic age have been found above the shallow allochthonous salt canopy in the northern Gulf of Mexico. These rafts of carbonate strata often overlie equivalent age Mesozoic carbonates in their correct stratigraphic position below the salt canopy.

The origin of keel structures is presently not well understood. As deformation occurs after shallow canopy emplacement, the keels are fairly recent developments geologically. Volumetrically few but intriguing observations suggest possible basement involvement in keel formation.

Desktop /Portals/0/images/_site/AAPG-newlogo-vertical-morepadding.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true 846

"The Great American Carbonate Bank" sounds like a great read, doesn't it? Hear what Bill Morgan has to share about this memoir from a great sedimentologist, paleontologist and educator - James Lee Wilson.

Desktop /Portals/0/PackFlashItemImages/WebReady/memoir-a-lasting-tribute-fig1.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true 2674

Field analogs allow a better characterization of fracture networks to constrain naturally fractured reservoir models. In analogs, the origin, nature, geometry, and other attributes of fracture networks can be determined and can be related to the reservoir through the geodynamic history. In this article, we aim to determine the sedimentary and diagenetic controls on fracture patterns and the genetic correlation of fracture and diagenesis with tectonic and burial history. We targeted two outcrops of Barremian carbonates located on both limbs of the Nerthe anticline (southeastern France). We analyzed fracture patterns and rock facies as well as the tectonic, diagenetic, and burial history of both sites. Fracture patterns are determined from geometric, kinematic, and diagenetic criteria based on field and lab measurements. Fracture sequences are defined based on crosscutting and abutting relationships and compared with geodynamic history and subsidence curves. This analysis shows that fractures are organized in two close-to-perpendicular joint sets (i.e., mode I). Fracture average spacing is 50 cm (20 in.). Fracture size neither depends on fracture orientation nor is controlled by bed thickness. Neither mechanical stratigraphy nor fracture stratigraphy is observed at outcrop scale. Comparing fracture sequences and subsidence curves shows that fractures existed prior to folding and formed during early burial. Consequently, the Nerthe fold induced by the Pyrenean compression did not result in any new fracture initiation on the limbs of this fold. We assume that the studied Urgonian carbonates underwent early diagenesis, which conferred early brittle properties to the host rock.

Desktop /Portals/0/PackFlashItemImages/WebReady/tectonic-versus-diagenetic-origin-of-fractures.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true 5726

The Distinguished Lecture program, funded in part by the AAPG Foundation, is the Association’s flagship initiative for spreading the latest in science, technology and professional information.

Desktop /Portals/0/images/_site/AAPG-newlogo-vertical-morepadding.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true 133

Last month in this space we analyzed the relations of fracture patterns and layer curvature in clay models. This month we examine these relations in a central Oklahoma field developed by Pathfinder Exploration, Norman, Okla.

Desktop /Portals/0/PackFlashItemImages/WebReady/quantitative-curvature-analysis-a-case-study-2013-08aug-hero.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true 2615

After decades spent visiting Morocco and neighboring Algeria, an AAPG member who's led countless field trips to some of the earth's most exotic places says the two old countries are evolving into modern times.

Desktop /Portals/0/PackFlashItemImages/WebReady/changing-north-africa-2013-08aug-hero.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true 2605

Prolific hydrocarbon discoveries in the subsalt, commonly known as the “presalt,” section of Brazil and the conjugate African margin have created a business imperative to predict reservoir quality in lacustrine carbonates. Geothermal convection is a style of groundwater flow known to occur in rift settings, which is capable of diagenetic modification of reservoir quality. We simulated variable density groundwater flow coupled with chemical reactions to evaluate the potential for diagenesis driven by convection in subsalt carbonates.

Rates of calcite diagenesis are critically controlled by temperature gradient and fluid flux following the principles of retrograde solubility. Simulations predict that convection could operate in rift carbonates prior to salt deposition, but with rates of dissolution in the reservoir interval only on the order of 0.01 vol. %/m.y., which is too low to significantly modify reservoir quality. The exception is around permeable fault zones and/or unconformities where flow is focused and dissolution rates are amplified to 1 to 10 vol. %/m.y. and could locally modify reservoir quality. After salt deposition, simulations also predict convection with a critical function for salt rugosity. The greatest potential for dissolution at rates of 0.1 to 1 vol. %/m.y. occurs where salt welds, overlying permeable carbonates thin to 500 m (1640 ft) or less. With tens of million years residence times feasible, convection under these conditions could locally result in reservoir sweet spots with porosity modification of 1% to 10% and potentially an order of magnitude or more in reservoir permeability. Integrating quantitative model–derived predictive diagenetic concepts with traditional subsurface data sets refines exploration to production scale risking of carbonate reservoir presence and quality.

Desktop /Portals/0/PackFlashItemImages/WebReady/geothermal-convection-in-south-atlantic-subsalt.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true 5682
Understanding the distribution and geometry of reservoir geobodies is crucial for net-to-gross estimates and to model subsurface flow. This article focuses on the process of dolomitization and resulting geometry of diagenetic geobodies in an outcrop of Jurassic host rocks from northern Oman. Field and petrographic data show that a first phase of stratabound dolomite is crosscut by a second phase of fault-related dolomite. The stratabound dolomite geobodies are laterally continuous for at least several hundreds of meters (sim1000 ft) and probably regionally and are one-half meter (1.6 ft) thick. Based on petrography and geochemistry, a process of seepage reflux of mesosaline or hypersaline fluids during the early stages of burial diagenesis is proposed for the formation of the stratabound dolomite. In contrast, the fault-related dolomite geobodies are trending along a fault that can be followed for at least 100 m (328 ft) and vary in width from a few tens of centimeters to as much as 10 m (sim1–33 ft). Petrography, geochemistry, and high homogenization temperature of fluid inclusions all point to the formation of the dolomite along a normal fault under deep burial conditions during the Middle to Late Cretaceous. The high 87Sr/86Sr ratio in the dolomite and the high salinity measured in fluid inclusions indicate that the dolomitizing fluids are deep basinal brines that interacted with crystalline basement. The dolomitization styles have an impact on the dimension, texture, and geochemistry of the different dolomite geobodies, and a modified classification scheme (compared to the one from Jung and Aigner, 2012) is proposed to incorporate diagenetic geobodies in future reservoir modeling.
Desktop /Portals/0/PackFlashItemImages/WebReady/linking-process-dimension-texture-and-geochemistry.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true 3772

West Edmond field, located in central Oklahoma, is one of the largest oil accumulations in the Silurian–Devonian Hunton Group in this part of the Anadarko Basin. Production from all stratigraphic units in the field exceeds 170 million barrels of oil (MMBO) and 400 billion cubic feet of gas (BCFG), of which approximately 60 MMBO and 100 BCFG have been produced from the Hunton Group. Oil and gas are stratigraphically trapped to the east against the Nemaha uplift, to the north by a regional wedge-out of Hunton strata, and by intraformational diagenetic traps. Hunton Group reservoirs are the Bois d'Arc and Frisco Limestones, with lesser production from the Chimneyhill subgroup, Haragan Shale, and Henryhouse Formation.

Hunton Group cores from three wells that were examined petrographically indicate that complex diagenetic relations influence permeability and reservoir quality. Greatest porosity and permeability are associated with secondary dissolution in packstones and grainstones, forming hydrocarbon reservoirs. The overlying Devonian–Mississippian Woodford Shale is the major petroleum source rock for the Hunton Group in the field, based on one-dimensional and four-dimensional petroleum system models that were calibrated to well temperature and Woodford Shale vitrinite reflectance data. The source rock is marginally mature to mature for oil generation in the area of the West Edmond field, and migration of Woodford oil and gas from deeper parts of the basin also contributed to hydrocarbon accumulation.

Desktop /Portals/0/PackFlashItemImages/WebReady/Bulletin-hero-2013-07jul.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true 3770

The Upper Jurassic Arab Formation in the Arabian Peninsula, the most prolific oil-bearing interval of the world, is a succession of interbedded thick carbonates and evaporites that are defined stratigraphically upsection as the Arab-D, Arab-C, Arab-B, and Arab-A. The Arab-D reservoir is the main reservoir in Khurais field, one of the largest onshore oil fields of the Kingdom of Saudi Arabia.

In Khurais field, the Arab-D reservoir is composed of the overlying evaporitic Arab-D Member of the Arab Formation and the underlying upper part of the Jubaila Formation. It contains 11 lithofacies, listed from deepest to shallowest: (1) hardground-capped skeletal wackestone and lime mudstone; (2) intraclast floatstone and rudstone; (3) pelletal wackestone and packstone; (4) stromatoporoid wackestone, packstone, and floatstone; (5) Cladocoropsis wackestone, packstone, and floatstone; (6) Clypeina and Thaumatoporella wackestone and packstone; (7) peloidal packstone and grainstone; (8) ooid grainstone; (9) crypt-microbial laminites; (10) evaporites; and (11) stratigraphically reoccurring dolomite.

The Arab-D reservoir lithofacies succession represents shallowing-upward deposition, which, from deepest to shallowest, reflects the following depositional environments: offshore submarine turbidity fans (lithofacies 1 and 2); lower shoreface settings (lithofacies 3); stromatoporoid reef (lithofacies 4); lagoon (lithofacies 5 and 6); shallow subtidal settings (lithofacies 7 and 8); peritidal settings (lithofacies 9); and sabkhas and salinas (lithofacies 10). The depositional succession of the reservoir represents a prograding, shallow-marine, reef-rimmed carbonate shelf that was subjected to common storm abrasion, which triggered turbidites.

Desktop /Portals/0/PackFlashItemImages/WebReady/arabian-carbonate-reservoirs-a-depositional-model.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true 3771
«« First |1 2 3 4 5 6 7 8 9 10 ... 11 12 13 14 15 16 | Last ››
In-Person Training
Abilene Texas United States 11 January, 2016 11 January, 2016 23513 Desktop /Portals/0/PackFlashItemImages/WebReady/aapg-southwest-section.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Geochemistry and Basin Modeling, Sedimentology and Stratigraphy, Engineering, Petrophysics and Well Logs, Clastics, Carbonates, Reservoir Characterization, Eolian Sandstones, Fluvial Deltaic Systems, Marine, Deepwater Turbidites
Abilene, Texas, United States
11 January 2016

The AAPG Southwest Section presents the 2016 Bill Hailey Memorial Short Course in Abilene, Texas. Dr. Matthew J. Pranter will be speaking on "Fundamentals of Reservoir Characterization and Modeling".

Questions? Contact Jean Campbell, Continuing Education Committee Chair.

Fort Worth Texas United States 12 January, 2016 12 January, 2016 23511 Desktop /Portals/0/PackFlashItemImages/WebReady/aapg-southwest-section.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Engineering, Reservoir Characterization, Sedimentology and Stratigraphy, Petrophysics and Well Logs, Clastics, Fluvial Deltaic Systems, Eolian Sandstones, Marine, Deepwater Turbidites, Carbonates, Geochemistry and Basin Modeling
Fort Worth, Texas, United States
12 January 2016

The AAPG Southwest Section presents the 2016 Bill Hailey Memorial Short Course in Fort Worth, Texas. Dr. Matthew J. Pranter will be speaking on "Fundamentals of Reservoir Characterization and Modeling".

Questions? Contact Jean Campbell, Continuing Education Committee Chair.

Muscat Oman 18 January, 2016 20 January, 2016 16517 Desktop /Portals/0/PackFlashItemImages/WebReady/gtw2016me-hydrocarbon-seals-hero.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Subsalt Traps, Structural Traps, Stratigraphic Traps, Diagenetic Traps, Fractured Carbonate Reservoirs, Reservoir Characterization, Engineering, Seismic Attributes, Geochemical Fingerprinting, 3D Seismic, Sedimentology and Stratigraphy, Sequence Stratigraphy, Evaporites, Clastics, Carbonates, Structure, Fold and Thrust Belts, Compressional Systems, Geomechanics and Fracture Analysis, Production, Drive Mechanisms
Muscat, Oman
18-20 January 2016

This workshop has the primary goal to share knowledge, case studies, techniques and workflows pertaining to the understanding and prediction of hydrocarbon seals for exploration and production in the Middle East. These seals range in age from Pre-Cambrian to Tertiary.    

Muscat Oman 19 January, 2016 19 January, 2016 20942 Desktop /Portals/0/PackFlashItemImages/WebReady/muscat-oman-field-trip-hero.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Field Trips, Conventions, Meeting Field Trip, Sedimentology and Stratigraphy, Carbonates
Muscat, Oman
19 January 2016

Known worldwide for its spectacular geology, the key geological units in the stratigraphy of Oman are exposed in the Muscat area. It is only a short distance to some excellent outcrops ranging from the Permo-Triassic basement to the Permo-Triassic sequence and the Semail Ophiolite found in the oceanic crust and upper mantle emplaced on the autochthonous Mesozoic carbonate succession of the Oman margin during the Late Cretaceous.

Muscat Oman 21 January, 2016 22 January, 2016 21264 Desktop /Portals/0/PackFlashItemImages/WebReady/Stratigraphical-Seals-of-Cretaceous-Platform-Carbonate-hero.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Field Trips, Conventions, Meeting Field Trip, Sedimentology and Stratigraphy, Carbonates, Structure
Muscat, Oman
21-22 January 2016

This field trip consists of two days discussing concepts related to structural and stratigraphical seals both in exploration and production scales.

Houston Texas United States 29 February, 2016 01 March, 2016 1348 Desktop /Portals/0/PackFlashItemImages/WebReady/ec-wec-carbonate-reservoir-geology-understanding-depositional.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Sedimentology and Stratigraphy, Carbonates, Phanerozoic, Geologic Age, Mesozoic, Paleozoic, Reservoir Characterization/Modeling, Geology, Carbonate Rocks, Petrophysics and Well Logs, Geochemistry and Basin Modeling
Houston, Texas, United States
29 February - 1 March 2016

The course starts with patterns of carbonate deposition and moves on to an examination of modern analogs for ancient sediments, diagenesis, and select case histories of Paleozoic and Mesozoic basin reservoirs.

Bari Italy 26 April, 2016 27 April, 2016 22865 Desktop /Portals/0/PackFlashItemImages/WebReady/Clastics-Discussion-Group-here.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Structure, Fold and Thrust Belts, Structural Analysis (Other), Sedimentology and Stratigraphy, Carbonates, Geochemistry and Basin Modeling, Petroleum Systems, Source Rock, Maturation, Migration
Bari, Italy
26-27 April 2016

Many factors and processes contribute to imparting an extraordinary complexity to carbonate reservoirs and source rocks. This unique complexity makes exploration and production of the huge petroleum resources hosted in carbonate sequences a very challenging task. This meeting follows the success of the conference held in Naples in April 2014 and aims at bringing together experts of different disciplines from the academia and the oil and gas industry. We invite you to share your experience on new approaches, new tools and new ways of integrating geological and geophysical information that can help in reducing the uncertainties related to the characterization and modeling of carbonate sequences and reservoirs.

Online Training
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.

07 June, 2012 07 June, 2012 1488 Desktop /Portals/0/PackFlashItemImages/WebReady/oc-es-new-production-in-oil-fields.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true
7 June 2012

Unger Field, discovered in1955, has produced 8.6 million barrels of oil from a thinly (several ft) bedded, locally cherty dolomite containing vuggy and intercrystalline porosity.

30 August, 2012 30 August, 2012 1489 Desktop /Portals/0/PackFlashItemImages/WebReady/oc-es-mississippian-carbonates-in-kansas.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true
30 August 2012

The entire Middle Pennsylvanian–to–top Precambrian basement (500 m) interval was cored in early 2011 in the BEREXCO Wellington KGS #1-32 well in Wellington Field, Sumner County, KS.

21 February, 2013 21 February, 2013 1495 Desktop /Portals/0/PackFlashItemImages/WebReady/oc-es-petrophysics-of-carbonates.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true
21 February 2013

The course will review core data, petrophysical comparisons, rock physics modeling (including pseudo logs and mechanical properties).

10 November, 2011 10 November, 2011 1481 Desktop /Portals/0/PackFlashItemImages/WebReady/oc-es-heterogeneity-in-carbonate-reservoirs.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true
10 November 2011

This work investigates how heterogeneity can be defined and how we can quantify this term by describing a range of statistical heterogeneity (e.g. coefficient of variation and the Lorenz coefficient).

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.

01 January, 2013 01 January, 9999 1459 Desktop /Portals/0/PackFlashItemImages/WebReady/oc-cc-giant-oil-and-gas-fields.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true
1 January 2013 - 1 January 9999

There are more approximately 1,000 oil and gas fields in the world that have been classified as "giant," containing more than 500 million barrels of recoverable oil and /or 3 trillion cubic feet of gas.

28 April, 2011 28 April, 2011 1471 Desktop /Portals/0/PackFlashItemImages/WebReady/oc-es-niobrara-petroleum-system-a-major-tight-resource-play.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true
28 April 2011

The Niobrara Petroleum System of the U.S. Rocky Mountain Region is a major tight petroleum resource play.

11 November, 2010 11 November, 2010 1465 Desktop /Portals/0/PackFlashItemImages/WebReady/oc-es-geochemical-evaluation-of-eagle-ford-group-source.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true
11 November 2010

This e-symposium is ideal for geologists, geophysicists, engineers and other geoscientists who are involved in gas shale exploration and production.

14 February, 3000 14 February, 3000 7817 Desktop /Portals/0/PackFlashItemImages/WebReady/oc-es-generic-hero.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true
Coming Soon

Check back often. "Find an Expert" feature is coming online soon!