Bulletin Article

5777
 

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.

5768
 
Predicting the presence and connectivity of reservoir-quality facies in otherwise mud-prone fluvial overbank successions is important because such sand bodies can potentially provide connectivity between larger neighboring sand bodies. This article addresses minor channelized fluvial elements (crevasse-splay and distributary channels) and attempts to predict the connectivity between such sand bodies in two interseam packages of the Upper Permian Rangal Coal Measures of northeastern Australia. Channel-body percent as measured in well logs was 2% in the upper (Aries-Castor) interseam and 17% in the lower (Castor-Pollux) interseam. Well spacing were too great to allow accurate correlation of channel bodies. The Ob River, Siberia, was used as a modern analog to supply planform geometric measurements of splay and distributary channels so that stochastic modeling of channel bodies was possible. The resulting models demonstrated that (1) channel-body connectivity is more uniform between minor distributary channels than between crevasse-splay channels; (2) relatively good connectivity is seen in proximal positions in splays but decreases distally from the source as channel elements diverge; and (3) connectivity tends to be greater down the axis of splays, with more isolated channel bodies occurring at the margins.

Events Blog

13236
 
Events Blog

The American Association of Petroleum Geologists (AAPG) and the Society of Exploration Geophysicists (SEG) announce a joint venture to co-present oil and gas events around the world to provide their members and the oil and gas global industry with the highest level of geosciences information and data exchange opportunities.

Explorer Article

13178
 

The call for abstracts has been opened for the next AAPG International Conference and Exhibition, which will be held Sept. 13-16 in Melbourne, Australia. The meeting theme is “A Powerhouse Emerges: Energy for the Next 50 Years,” created in part to signify the 50th anniversary of the Gippsland Basin oil discovery, which unlocked Australasian market activity.

13217
 

Three speakers from the AAPG-AAPG Foundation’s Global Distinguished Lecture Program will be on tour in November, making stops in the western parts of North America and throughout the Asia-Pacific Region.

Explorer Division Column EMD

13237
 
Explorer Division Column EMD

Over the past year or so we have observed strong evidence that nuclear power is into a new expansion period.

Explorer Emphasis

13192
 

MOOSE – Multiphysics Object-Oriented Simulation Environment – is a software platform designed to make predictive modeling and simulation faster and easier.

12444
 
Explorer Emphasis Article

Coiled tubing (CT) has long been used to meet various needs in the oil and gas industry. In some instances, it is used to actually drill a well.

Explorer Historical Highlight

11829
 

Saharan fields Hassi Messaoud (10 Gb reserves, discovered in 1956) and Hassi R’Mel (100 Tcf gas plus 2.4 Gb condensate reserves, discovered in 1957) are by far the largest oil field and the largest gas field in Africa

Explorer ProTracks

11835
 
Explorer ProTracks

AAPG Young Professionals (YPs) in the Asia-Pacific Region are quickly moving toward establishing a strong YP group in Indonesia.

Education Conference Course

Houston Texas United States 02 March, 2015 03 March, 2015 1348
 
Houston, Texas, United States
2-3 March 2015

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.

Short Course

Kuala Lumpur Malaysia 08 December, 2014 09 December, 2014 11419
 
Kuala Lumpur, Malaysia
8-9 December 2014

The goal of this course is to provide a review and an update on the status and lessons learned in the world’s major unconventional plays. The goal is to compare the approaches taken in the major plays, from reconnaissance exploration to acquisition of acreage, well siting, drilling program planning, completions, and production. In some cases, secondary recovery and re-entries will be discussed (in the case of steep decline curves and the need to restimulate the well). This course will review techniques, technologies, and prevailing philosophies.

Workshop

Brisbane Australia 12 February, 2015 13 February, 2015 11170
 
Brisbane, Australia
12-13 February 2015

The aim of the workshop is to provide an initial overview of CBM opportunities in the Asia Pacific and to share and examine recent technological advancements in geological understanding and in key engineering practices which are emerging from around the region.

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