川东北地区海相碳酸盐岩三期成烃成藏过程  

Three hydrocarbon generation and accumulation processes of marine carbonate rocks in northeastern Sichuan Basin,China

作　　者：秦建中[1] 孟庆强[2] 付小东[1] 

机构地区：[1]中国石化石油勘探开发研究院无锡石油地质研究所 [2]中国石油大学(北京)盆地与油藏研究中心

出　　处：《石油勘探与开发》2008年第5期548-556,共9页Petroleum Exploration and Development

基　　金：国家重点基础研究发展规划“973”项目子课题“中国海相碳酸盐岩层系生烃条件与生烃史分析”(2005CB422102)

摘　　要：川东北地区构造运动复杂，导致油气成藏过程复杂，为细化该区油气成藏史，对白云岩储气层中的固体沥青特征、包裹体均一温度、成岩作用等进行了研究。印支期（T2）末，上奥陶统五峰组（O3w）一下志留统龙马溪组（S11）生成大量低熟稠油，此时，上二叠统长兴组（P2ch）生物礁相中孔隙发育，形成储集空间；二叠系（P）烃源岩及O3w—S1l烃源岩在燕山早期（J2）达到生成原油或轻质油高峰，上述两个时期形成的油气包裹体均一温度范围为100～150℃；在燕山晚期（K2）一喜马拉雅期，早期形成的油气藏与烃源岩及分散可溶有机质发生热裂解生成干气，形成现今的天然气（甲烷）藏。因此川东北地区存在三期成烃成藏过程，分别是印支期、燕山早期和燕山晚期。图7表2参26关键词：四川盆地；普光气田；海相碳酸盐岩；The solid asphalt characteristics, inclusions homogenization, and diagenesis are studied in northeastern Sichuan Basin. During Indosinian movement, the source rocks in O3 w （Upper Ordovician Wufeng Formation） and S1I （Lower Silurian Longmaxi Formation） generated low-mature heavy oil, meanwhile, the organic reef facies of Upper Permian Changxing Formation formed reservoir space for the heavy oil. The Permian and O3 w- S1l source rocks generated peak oil during early Yanshan movement. The homogenization temperature of hydrocarbon fluid inclusions formed during the aforementioned two stages ranged from 100 to 150 ℃. During late Yanshan and Himalayan movements, the early formed oil and source rocks and soluble ＂organic matter＂ all had reached high and post mature stages. The present natural gas reservoirs were formed by cracking. Therefore, there are three hydrocarbon generation and accumulation processes in northeast Sichuan Basin, which occurred during Indosinian movement, early Yanshan movement and late Yanshan movement, respectively.

关 键 词：四川盆地 普光气田 海相碳酸盐岩 成烃成藏过程 

分 类 号：TE122.1[石油与天然气工程—油气勘探]