Explorer Article

A new format for training is introduced through AAPG's Education programs. The WEC may be just what you've been waiting for.

American Association of Petroleum Geologists (AAPG)
Explorer Emphasis Article

There's more to Alaska than Prudhoe Bay: New technology and some surprising geological discoveries are helping to reawaken Alaska's petroleum promise.

American Association of Petroleum Geologists (AAPG)
Explorer Emphasis Article

Working it out ... DOE workshop examines applications for microhole technology.

American Association of Petroleum Geologists (AAPG)
Explorer Division Column EMD

Coalbed methane accounts for about 8 percent of the natural gas produced in the United States. With global exploration and development in an early phase, coalbed methane is poised to continue for decades as an important energy source.

American Association of Petroleum Geologists (AAPG)
Explorer Article

Timing, teamwork and technology contributed to the success stories of the lives of the lives of the featured lecturers at the Michel T. Halbouty Lecture.

American Association of Petroleum Geologists (AAPG)
Explorer Article

The story of the deepwater Tahiti discovery continues to unfold, confirming that giants still stand tall in the Gulf of Mexico.

American Association of Petroleum Geologists (AAPG)
Explorer Article

Go east, young geologist, go east? Thanks in part to Cold War era surveillance work, offshore East Africa is garnering renewed scientific and industrial interest.

American Association of Petroleum Geologists (AAPG)
Explorer Article

Shallow water, deep gas: In the scramble to find and produce new gas resources, operators are looking to the Gulf of Mexico to save the day.

American Association of Petroleum Geologists (AAPG)
Explorer Emphasis Article

Noted oilmen to discuss their track records for discovering oil and gas fields in the Rocky Mountain region as Michel T. Halbouty Lecture series guests.

American Association of Petroleum Geologists (AAPG)
Explorer Emphasis Article

Salt Lake City is the site of the 88th AAPG Annual Meeting — and the program is as compelling as the setting is beautiful.

American Association of Petroleum Geologists (AAPG)
VG Abstract

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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American Association of Petroleum Geologists (AAPG)

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