Explorer Article

The oil and gas business continues to be among the crown jewels of the United Kingdom's economy, sustaining an impressive performance for over three decades -- and through innovative approaches, officials mean to keep it that way.

American Association of Petroleum Geologists (AAPG)
Explorer Wildcat Recollections Column

In the mid-1990s, Arco International reviewed a farm-out proposal from Enterprise Oil for drilling on a block held by Enterprise in the Romanian Black Sea. Enterprise already had completed a seismic program and had mapped a variety of structures on the block.

American Association of Petroleum Geologists (AAPG)
Explorer Emphasis Article

The oil and gas business has been one of the crown jewels of the United Kingdom's economy for years, sustaining an impressive performance for over three decades - and through innovative approaches, officials mean to keep it that way.

American Association of Petroleum Geologists (AAPG)
Explorer Emphasis Article

An increasing number of companies, in an increasing number of places around the world, consider horizontal drilling as an option in all kinds of plays. Through May 1999 Denver-based IHS Energy Group's databases contained records for 20,430 horizontal wells in 67 different countries.

American Association of Petroleum Geologists (AAPG)
Explorer Article

The American Association of Petroleum Geologists, an international organization of over 30,000 earth scientists, supports scientifically designed, state-based environmental oversight of hydraulic fracturing treatments for those coalbed methane and other hydrocarbon wells that may occur near zones of potable water.

American Association of Petroleum Geologists (AAPG)
Explorer Wildcat Recollections Column

Indonesia is a prolific oil and gas province with discovered reserves of more than 23 BBO and 150 TCFG. Most of the reserves originate from Tertiary source rocks and are trapped in Tertiary reservoirs on or immediately offshore of Java, Sumatra and Kalimantan.

American Association of Petroleum Geologists (AAPG)
Explorer Article

Various award winners have been announced for technical presentations at the AAPG annual meeting in New Orleans, including recipients of the Matson and Braunstein awards.

American Association of Petroleum Geologists (AAPG)
Explorer Article

Supply pessimists take the industry's declining oil discovery rate as an alarm signal. Most believe world oil production will peak within a decade -- if it hasn't already.

American Association of Petroleum Geologists (AAPG)
Explorer Emphasis Article

Charles 'Chip' Groat will be speaking for two different luncheons at the annual meeting. Signs are optimistic at the U.S. Geological Survey where Groat is the director.

American Association of Petroleum Geologists (AAPG)
Explorer Article

On the arid high plains of northeast Wyoming, the town of Gillette has become a bona fide boomtown. And it's coalbed methane creating the frenzy. The Powder River Basin has become the site of the hottest natural gas play in the country, a region most so-called experts wrote off as a wasteland for the gas.

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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