琼东南盆地深水区超压演化与油气运移模拟  

Modelling of evolution of overpressure system and hydrocarbon migration in deepwater area of Qiongdongnan basin, South China Sea

作　　者：翟普强[1,2] 陈红汉[1] 谢玉洪 王振峰 童传新 

机构地区：[1]中国地质大学(武汉)构造与油气资源教育部重点实验室,湖北武汉430074 [2]中海石油(中国)有限公司深圳分公司,广东广州510240 [3]中海石油(中国)有限公司湛江分公司,广东湛江524057

出　　处：《中南大学学报（自然科学版）》2013年第10期4187-4201,共15页Journal of Central South University:Science and Technology

基　　金："十二五"国家科技重大专项项目(2011ZX05023-004-010)

摘　　要：基于2D盆地模拟技术研究深水区超压演化和油气运移。研究结果表明:中央裂陷带在渐新世崖城期就已形成超压,裂陷期内可分为东、西两大压力系统,约10.5 Ma以来逐渐演化为西部一个超压系统,并自西向东呈传递趋势,现今超压顶面和油气运移顶面都具有西浅东深特征。东部和西部地区大致分别经历了3个和3.5个压力旋回。这种超压的旋回性演化主要受构造、断裂活动和沉积环境演变控制,生烃作用影响不大。晚中新世以来是晚期天然气运移和聚集的关键时期,中央坳陷带北坡是深水区油气运移的优势方向。西部地区压力过渡带和常压带内的圈闭以及东部地区断裂附近低幅超压带内的圈闭最有利于油气聚集。The evolution of overpressure system and its coupling relationship with hydrocarbon accumulation in the deepwater area of Qiongdongnan basin were studied based on 2D basin modeling. The results show that overpressure system in the central depression has already developed during the Yacheng period and consisted of an eastern subsystem and a western subsystem during the initial rifting period. They gradually evolve into a big overpressure system in the west till 10.5 Ma and exhibit a trend transferring eastward. The current top overpressured surface （TOS） totally deepens eastward, similarly with the top migration surface （TMS）. The eastern basin experiences three pressure cycles while the western basin experiences three and a half. It is recognized that tectonics, fault activity and sedimentation play important roles in the cyclicity of pressure evolution, while hydrocarbon generation cannot be a dominant factor. The critical period for petroleum migration and accumulation is from the late Miocene, and the predominant direction should be the northern slope of the central depression. The most favorable targets for future exploration should be the traps in the transitional pressure zone and normal pressure zone in the western basin and the traps near faults in the low scope or transitional pressure zone in the eastern basin.

关 键 词：超压演化 油气运移 盆地模拟 深水区 琼东南盆地 

分 类 号：P618.13[天文地球—矿床学] TE122[天文地球—地质学]