张琴;边瑞康;唐颖;朱华;

• 1:中国地质大学(北京)海相储层演化与油气富集机理教育部重点实验室
• 2:中国地质大学(北京)能源学院

摘要：

分析库车拗陷钻井和地球化学资料,研究页岩气聚集的条件.结果表明:库车拗陷侏罗系—三叠系泥页岩有机碳质量分数高,集中分布在2.0%~3.0%之间;泥页岩厚度大,多数在200 m以上;干酪根类型以倾于生气的腐殖型为主;有机质成熟度分布较广,从0.6%~3.0%均有分布,主要集中分布在2.0%附近,有机质处于成熟—高熟阶段,具备形成页岩气的物质基础.库车拗陷构造活动强烈,逆掩断裂发育,为该地区泥页岩中天然裂缝的发育提供条件,有利于页岩气的富集和实现工业开采.利用多因素叠合法对库车拗陷页岩气有利聚集区进行预测,认为侏罗系页岩气聚集的有利区为拜城拗陷及克依构造带上,三叠系页岩气聚集的有利区集中分布在拜城拗陷,而在克依构造带有部分分布.

关键词： 库车拗陷;页岩气;聚集条件;有利发育区;勘探前景

Abstract: The analysis of accumulation conditions study of shale gas in Kuqa Depression,based on massive seismic,logging and geochemical data indicats that TOC in Jurassic and Triassic of Kuqa depression was abundant which mainly distributed between 2.0% and 3.0%,the thickness of shale was large which was mostly beyond 200 m,the organic matter maturity distributed widely from 0.6% to 3.0% and mainly concentrated around 2.0% which demonstrated the organic matter was in high maturity stage.Humic Kerogen,prone to gas generation,was the main kerogen type in Kuqa Depression.All conditions mentioned above provided material basis for shale gas.Intense tectonic movement and well developed overthrust faults were favorable for fracture development and which could lead to abundant shale gas accumulation.We adopt multi-factor superposition method to predict profitable shale gas play of Kuqa Depression and the results indicate that Baicheng Sag and part of Keyi Structure Belt are favorable for Jurassic shale gas,Baicheng Sag and Keyi Structure Belt are favorable for Triassic shale gas.

Keywords: Kuqa depression;shale gas;geological conditions;favorable areas of shale gas;exploration prospect

基金项目: 国家自然科学基金项目(40672087);; 国家“973”重点基础研究项目(2005CB422106)

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