Formation Processes and Advantageous Models for High-Low-Rank Coalbed Methane Reservoirs

Abstract

Abstract: The typical formation processes of high-low rank coalbed methane (CBM) reservoirs are presented based on tectonic evolution extents. The key factors controlling current accumulation and enrichment of CBM reservoirs are discussed. The study shows that the high rank CBM reservoir is of obvious episode for it normally undergoes multiple subsidence, uplift and modification with sufficient CBM and complex forming process; the CBM is not generated till reaching its highest evolution. So its current accumulation and enrichment mainly depend on conservation conditions. The formation process of low rank CBM reservoir is often simple, just undergoing single subsidence, single uplift and gentle modification, and controlled by underwater supply, migration, drainage and detention. According to these understandings, the advantageous model of high rank CBM reservoirs with closed system and the advantageous model of low rank CBM reservoir with basinal margin or gentle slope area are developed.

Key words: coalbed methane (CBM), reservoir, tectonic evolution, contrast, model

CLC Number:

TE122.2

CHEN Zhen-hong, SONG Yan. Formation Processes and Advantageous Models for High-Low-Rank Coalbed Methane Reservoirs[J]. Xinjiang Petroleum Geology, 2007, 28(3): 275-278.

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