沁水盆地成庄区块煤层气成藏优势及富集高产主控地质因素

doi:10.11743/ogg20180215

Abstract

Abstract: As one of the most successful blocks of coalbed methane (CBM) development in Qinshui Basin,the exploration and development in Chengzhuang coal block can provide useful guidance for the development of other CBM blocks with geologically similar backgrounds.In combination of plenty of practical data on exploration and development and methods such as mathematical statistics,laboratory experiment,wire line logging interpretation,structure analysis,numerical modeling,decline analysis,we analyzed the genetic mechanism,accumulation conditions of CBM,and patterns of gas production,in the Chengzhuang Block.The study indicates that:(1) the Chengzhuang Block is characterized by favorable accumulation conditions with its simple structure,extensive reservoir distribution,shallow burial depth of coal reservoir,organic thermogenic gas,high gas content and high permeability;(2) the high productivity wells account for 47% of the total wells of the block,with high average production of 4 000~7 000 m³/d per well and high expected recovery of 55.1%.Furthermore,we analyzed the controlling mechanisms for CBM gas accumulation and high production,and concluded that (1) the tectonic thermal events would boost gas generation,reservoir quality,seal-capping capacity and optimal distribution of hydrodynamic force,which would be beneficial for CBM accumulation;(2) the coal reservoirs with horizontal extensional stress and in the coal mine pressure relief zone are of high permeability,favorable for CBM production.

Key words: recovery, CBM, Chengzhuang Block, Qinshui Basin

CLC Number:

TE122.3

Wang Bo, Yao Hongxing, Wang Hongna, Zhao Yang, Li Mengxi, Hu Qiujia, Fan Meirong, Yang Chunli. Favorable and major geological controlling factors for coalbed methane accumulation and high production in the Chengzhuang Block,Qinshui Baisn[J]. Oil & Gas Geology, 2018, 39(2): 366-372.

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Favorable and major geological controlling factors for coalbed methane accumulation and high production in the Chengzhuang Block,Qinshui Baisn

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