Geological features and resource potentials of coalbed methane basins in China

Sun Wanlu; Chen Zhaoyou; Chen Xia; Wang Shuhua; Fu Xiaoyun

doi:10.11743/ogg20050202

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Geological features and resource potentials of coalbed methane basins in China
Vol. 26, Issue 2, Pages: 141-146(2005)
Online First：25 April 2005，

Published：2005
DOI： 10.11743/ogg20050202
稿件说明：

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DOI：

Sun Wanlu, Chen Zhaoyou, Chen Xia, et al. Geological features and resource potentials of coalbed methane basins in China[J]. 2005, 26(2): 141-146. DOI： 10.11743/ogg20050202.

摘要

中国大陆含煤盆地集中分布在塔里木-华北板块、华南板块及准噶尔-兴安活动带的构造活动相对稳定的陆块或地块上

形成时代主要为石炭—二叠纪、晚三叠世—早白垩世和第三纪。依据所处大地构造域的位置及沉积构造特征

大体分为板内克拉通型与陆内断陷、坳陷型。含煤盆地中形成煤层气藏受下列条件控制:(1)古气候、古植物、古地理、古构造以及沉积环境控制了煤的形成、分布及品质;(2)构造变形直接控制了盆地的整体封存条件

影响了盆地中煤的埋深及煤储层的渗滤性;(3)煤岩变质程度一是影响生气量

二是影响煤岩的渗滤性;(4)封盖层和水动力条件决定煤层气藏的保存状态。经测算

中国大陆煤层气资源丰富

有20×10

的远景资源量。

Abstract

Coal basins in Chinese mainland are mainly distributed in Tarim-North China plate

South China plate and the relatively stable landmasses and land blocks in Junggar-Xing'an active belt

and have mainly been formed in Permo-Carboniferous

Late Triassic-Early Cretaceous and Tertiary. They can be divided into intraplate cratonic basins and intracontinental rift-depression basins according to their locations in tectonic domain and sedimentary structural features. Reservoiring of coalbed methane in coal basins have been controlled by the following factors:(1) formation

distribution and quality of coals have been controlled by palaeoclimate

fossil plant

palaeogeography

palaeostructure and depositional environment; (2) tectonic deformation has controlled directly the entire sealing conditions of the basins and influenced the burial depth of coal beds and filtration properties of coal reservoirs; (3) degree of metamorphism has influenced both the amount of coalbed methane generated from coal and the filtration properties of coal beds; (4) sealing and hydrodynamic conditions would have determined the preservation of coalbed methane reservoirs. The prospective coalbed methane resources in China have been estimated to be 20TCM (trillion cubic meters).