Accumulation types and resources characteristics of shale gas in China
Accumulation types and resources characteristics of shale gas in China
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发表时间：
2009
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通讯作者：
Jin Tie-ya
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作者：
Jin Tie-ya
通过对比分析美国和中国两国页岩气成藏条件及地质条件的相似性，认为两国具有相似的有利页岩气聚集的地质条件，页岩气资源储量和开发潜力相近。中国地区的页岩气总体上具有高有机碳、高热成熟度和后期改造程度高的特点。页岩气成藏以陆相沉积为特征，受沉积区划分控制，分布多样复杂。页岩气成藏可分为直接型和间接型，也可分为南部型3种。根据中国区域地质条件，将页岩气分为北部型和西北型。南部型页岩气主要聚集在构造改造作用强烈的古生代海相页岩中，具有单层厚度大、发育层位多、分布区域广、热成熟度高、后期改造程度高等特点。北部型页岩气分布于中国板块北部，主要聚集在古生界至中生代至新生代的群组中，具有沉积运移、薄互层频发等特点。塔里木板块西北型页岩气分布于古生界-中生界，具有沉积类型多样、有机碳含量高、热成熟度相对较低等特点，预测中国地区页岩气可采资源量约为26tcm，接近美国的28tcm。
Through comparison analysis of shale gas accumulation conditions and the similarity of geological conditions in the U.S.A and China,this study concluded that both countries have similar geological conditions favorable for shale gas accumulation and have approximate shale gas resource reserves and development potentials.In general,the gas-bearing shale layers in China possess high TOC,high thermal maturity and a high degree of later reformation.Shale gas accumulations are characterized by terrestrial facies deposit,controlled by sedimentation region division,and various and complicated distribution.Shale gas accumulations can be classified into direct and indirect types,and also can be divided into three types as southern type,northern type and north-western type according to the regional geologic conditions in China.The southern type of shale gas,distributed around the Yangtze plate,is mostly accumulated in the Paleozoic marine shale which experienced intensive structural reformation,and is featured by a large thickness of a single layer,multiple developed layers,a wide distribution area,high thermal maturity,and a high degree of later reformation,etc.The northern type of shale gas,distributed in the north China plate,is mostly accumulated in the groups from Paleozoic via Mesozoic to Neozoic,and is characterized by sedimentary migration,a high frequency of thin interbedded layers,and an obvious division between sedimental facies.The north-western type of shale gas,distributed around the Tarim Plate,is accumulated in the groups from Paleozoic to Mesozoic,and has the characteristics of various types of sedimentation,high TOC,and relatively low thermal maturity.It is concluded that the recoverable shale gas resources is predicated to be about 26 tcm in China,close to 28 tcm of that in the U.S.A.