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Assessment of Natural Gas from Coalbeds by Geologic Characterization and Production Evaluation

By
Raoul Choate
Raoul Choate
TRW Exploration and Production Lakewood, Colorado
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John P. McCord
John P. McCord
TRW Exploration and Production Lakewood, Colorado
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Craig T. Rightmire
Craig T. Rightmire
TRW Exploration and Production Houston, Texas
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Published:
January 01, 1986

Abstract

The relative attractiveness of coalbeds as source rocks and potential gas reservoirs are functions of the amount of methane generated by coal and the amount of methane retained in coal* The amount of methane gas generated during the coalification process depends primarily on the thermal maturity (rank) of the coal and the volume (thickness and lateral continuity) of coal present* The retention of methane gas in a coalbed reservoir will depend on a combination of factors including depth (i.e., fluid pore pressure), temperature, coal rank, and the hydrogeologic environment. Given a coalbed with the proper combination of methane generation and storage, the final and most critical factor is the production potential of the reservoir. Experience has shown that short duration testing (drill stem testing) does not provide the necessary data to address this issue. The production case histories presented here suggest that long duration production testing is the only way to adequately assess economic potential.

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Contents

AAPG Studies in Geology

Oil and Gas Assessment: Methods and Applications

Dudley D. Rice
Dudley D. Rice
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American Association of Petroleum Geologists
Volume
21
ISBN electronic:
9781629811468
Publication date:
January 01, 1986

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