邓强,逄建东,牛佳文,赵云斌,李晶晶
DENG Qiang,PANG Jiandong,NIU Jiawen,ZHAO Yunbin,LI Jingjing

• 1:中海油能源发展股份有限公司工程技术分公司

摘要(Abstract)：

针对西山煤田多期性、多幕性构造运动及多阶段变质演化和变质作用而导致的异常复杂煤层成藏演化史,在研究埋藏史、构造演化史的基础上,借鉴前人测年、热演化史、成熟史及生烃史等研究成果,探讨了煤层气藏的成藏过程和关键成藏期。通过东区与西区煤层差异热演化史特征和聚气史的对比研究,认为东区受祁县隐伏侵入岩体影响,二次生烃时期为晚三叠-早侏罗世;西区受狐偃山岩体的影响,二次生烃期为晚侏罗-早白垩世。指出东区深成变质作用生气高峰期与二次生烃连续,生气史曲线二次生烃台阶不明显;西区的生气高峰期与二次生烃不连续,生气史曲线呈明显的台阶特征。证实西区煤层二次生烃时间比东区的晚近50 Ma,煤层气遭受散失的时间相对短,对煤层气藏的保存有利。研究成果为该煤田煤层气勘探开发提供了理论依据。
In the light of the rather complicated accumulation evolution history resulted from the multi-period and multi-phase tectonic movements and multi-stage metamorphic evolutions and actions of Xishan Coalfield,based on the burial and evolutions histories' researches and combined with the previous achievements of the age measurement,thermal evolution,maturity and hydrocarbon generation histories and so on,the accumulation process and key periods are discussed for the coalfield CBM.The comparative studies on the differential thermal evolution characteristics and CBM accumulation history for East and West Blocks show that the former block is influenced by Qixian concealed intrusion rocks,the secondary hydrocarbon generation period was Late Triassic-Early Jurassic Epoch;the latter is influenced by Huyanshan intrusion rocks and the secondary hydrocarbon generation period was Late Jurassic-Early Cretaceous Epoch.The CBM key generating peak of the plutonic metamorphism in East Block was continuous with the one of the secondary hydrocarbon generation,the hydrocarbon generation steps of the gas generation curve are not obvious;the two peaks of West Block were not continuous and the steps are obvious;the generation time of the west was later 50 Ma than that of the east,and moreover the scattered and lost time of the CBM is relatively shorter,these conditions are favorable for the preservation of the CBM reservoirs.All the achievements provide a certain theoretical evidences for the exploration and development of the CBM in the coalfield.

关键词(KeyWords)： 煤层气;埋藏史;成藏过程;关键成藏期;二次生烃;西山煤田
coalbed methane(CBM);burial history;accumulation process;key accumulation period;secondary hydrocarbon generation;Xishan Coalfield

Abstract:

Keywords:

基金项目(Foundation): 中海油能源发展重大专项“非常规油气勘探关键技术”(WBS:E-J313N020)

作者(Author): 邓强,逄建东,牛佳文,赵云斌,李晶晶
DENG Qiang,PANG Jiandong,NIU Jiawen,ZHAO Yunbin,LI Jingjing

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