川西坳陷马井—什邡地区蓬莱镇组天然气运移特征(六月增刊)
投稿时间:2014-12-18  修订日期:2014-12-24  点此下载全文
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赵双丰 中国石油大学北京地球科学学院

中国石油大学北京油气资源与探测国家重点实验室

 
48567375@qq.com 
张枝焕 中国石油大学北京地球科学学院

中国石油大学北京油气资源与探测国家重点实验室

 
Email:zhangzh3996@vip.163.com 
李文浩 中国石油大学华东非常规油气与新能源研究院
中国石油大学华东非常规油气与新能源研究院 
 
万甜甜 中国石油大学北京地球科学学院

中国石油大学北京油气资源与探测国家重点实验室
 
 
基金项目:“十二五”国家科技重大专项(2011ZX05002-006)资助。
中文摘要:马井—什邡气田的主力勘探层位是上侏罗统蓬莱镇组,天然气藏集中在蓬莱镇组中上部。蓬莱镇组天然气属于典型的煤型气,气体组分中甲烷含量占绝对优势,其他重烃及非烃气体组分含量较少,干燥系数基本在0.95以上,为典型的干气特征。气源对比结果表明,蓬莱镇组天然气主要来自于下伏须家河组煤系烃源岩。C1/C1-5、CO2/CH4、N2/ C2H6及流体包裹体组成特征等多组示踪参数综合显示,天然气以燕山晚期形成的深大断裂带为运移通道,由须家河组垂向运移至蓬莱镇组砂岩储层,并沿输导砂体由高势区向低势区侧向运移,至适当圈闭中聚集成藏,天然气大规模运移时期为白垩纪末至古近纪早期,主成藏期为晚白垩世晚期至古近纪晚期。
中文关键词:川西坳陷  马井—什邡地区  天然气  蓬莱镇组  运移分馏
 
The Migration Characteristics of Natural Gas of Penglaizhen Formation in Majing-Shifang Area, Western Sichuan Depression
Abstract:The main exploration horizon of gas field in Majing and Shifang area is the upper Jurassic in Penglaizhen formation, natural gas is mainly concentrated in middle and upper Penglaizhen formation. Natural gas in Penglaizhen formation belongs to typical coal-type gas, which is predominated by methane. While the content of heavy hydrocarbon and non-hydrocarbon is scarce. The aridity coefficient of the gas is universally above 0.95, showing typical dry gas characteristics. Gas-source correlation results indicate that: The natural gas in Penglaizhen formation is mainly from coal-measure source rock in the upper underlying the Xujiahe group. The migration channel of the natural gas is the deep fault belt formed in late yanshanian.The integrated display of the tracing parameters by C1/C1-5、CO2/CH4、N2/ C2H6 and fluid inclusions show, the gas is under the effect of buoyancy, via the vertical migration from deep Xujiahe Formation to the sandstone reservoir in the superficial zone in Penglaizhen formation, and then followed by the lateral migration along the channel sand body from the conformation of low potential region to the conformation of high potential region, and reached to the entrapment, in the end to be gathered accumulation. Mass migration period of natural gas was from the end of Cretaceous to the early of Paleogene, the main period of accumulation was from the late Cretaceous to the late Paleogene.
keywords:western Sichuan depression  Majing and Shifang area  natural gas  Penglaizhen formation  segregative migration
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