中国煤层气盆地地质特征与资源前景

doi:10.11743/ogg20050202

摘要/Abstract

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20×10¹²m³ 的远景资源量。

关键词: 煤层气盆地, 地质特征, 资源前景

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).

Key words: coalbed methane basin, geologic features, resource potential

中图分类号:

TE122.2

孙万禄,陈召佑,陈霞,等. 中国煤层气盆地地质特征与资源前景[J]. 石油与天然气地质, 2005, 26(2): 141-146,154. doi: 10.11743/ogg20050202 Sun Wanlu,Chen Zhaoyou,Chen Xia,et al. Geological features and resource potentials of coalbed methane basins in China[J]. Oil & Gas Geology, 2005, 26(2): 141-146,154. doi: 10.11743/ogg20050202

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