川西坳陷孝泉-新场地区陆相天然气地球化学及运移特征  被引量:4

Characteristics of natural gas geochemistry and migration in Xiaoquan-Xinchang area,Western Sichuan Depression

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作  者:赵双丰[1,2] 张枝焕[1,2] 李文浩 闫红星[4] 万甜甜[1,2] 马玲[1,2] 

机构地区:[1]中国石油大学地球科学学院,北京102249 [2]中国石油大学油气资源与探测国家重点实验室,北京102249 [3]中国石油大学非常规油气与新能源研究院,山东青岛266580 [4]中国石油辽河油田勘探开发研究院,辽宁盘锦124010

出  处:《中国石油大学学报(自然科学版)》2015年第2期31-38,共8页Journal of China University of Petroleum(Edition of Natural Science)

基  金:'十二五'国家科技重大专项(2011ZX05002-006)

摘  要:天然气运移研究一直是油气地质领域中至关重要但又最为薄弱的环节,选取甲烷碳同位素、气体干燥系数(C1/C1-5)、i C4/n C4、非烃气体组成等多项天然气运移示踪参数,对孝泉-新场地区陆相天然气的运移特征进行分析。结果表明:须家河组储层紧邻烃源岩,天然气就近成藏,二次运移特征不明显,由于运移距离较短,烃源岩生排烃与天然气的成藏几乎同期进行;侏罗系天然气为次生气藏,天然气以燕山晚期至喜山期形成的深大断裂带为运移通道,由须家河组垂向运移至侏罗系储层,并沿输导砂体由构造低部位向构造高部位侧向运移,至适当圈闭中聚集成藏,天然气大规模运移时期为晚白垩世末期—古近纪。The weakest link in the field of petroleum geology has been the research on the natural gas migration. Methane carbon isotope,gas drying coefficient(C1/C1-5),iC4/ nC4,non-hydrocarbon gas composition and numbers of tracer gas migration parameters were applied to analyze the migration characteristics of the continental natural gas in Xiaoquan-Xinchang area. The results show that the Xujiahe Formation is adjacent to source rocks where natural gas is accumulated nearby. The formation has unapparent secondary gas migration characteristic. Due to short migration distance,the hydrocarbon generation and expulsion of the source rocks and natural gas reservoir occurred almost at the same time. Jurassic aged gas is the secondary gas pool,whose migration channel is the deep fault belt in the Himalayan Formation. The gas migrated vertically from the Xujiahe Formation to the Jurassic reservoir,and then migrated laterally along the channel sand body from the low potential region of conformation to the high potential region of conformation,and reached the appropriate entrapment for accumulation.The dominating natural gas migration period is the end Late Cretaceous-Paleogene.

关 键 词:川西坳陷 孝泉-新场地区 天然气 蓬莱镇组 次生气藏 运移分馏 

分 类 号:TE122.1[石油与天然气工程—油气勘探]

 

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