渤海湾盆地北塘凹陷新生代幕式裂陷过程与构造应力场变化的关联分析  

The Association Analysis of Tectonic Stress Field on Episodic Rifting in Cenozoic of Beitang Sag of Bohai Bay Basin

作　　者：林正良[1] 王华[1] 姜华[2] 岳勇 肖敦清[4] 张兵[4] 

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]中国地质大学(武汉)生物地质与环境地质教育部重点实验室,湖北武汉430074 [3]中国石油化工股份有限公司西北油田分公司,新疆乌鲁木齐830011 [4]大港油田分公司勘探开发研究院,天津300280

出　　处：《石油天然气学报》2009年第3期24-29,共6页Journal of Oil and Gas Technology

基　　金：国家自然科学基金项目(40872077);湖北省自然科学基金重点项目(2008CDA098)

摘　　要：北塘凹陷具有幕式沉降的特征。通过沉降史模拟分析研究可知,北塘凹陷可划分为多个沉降幕,每一幕具有不同的沉降速率和沉积充填响应特征。通过地层厚度及其回剥分析研究发现:裂陷Ⅰ幕和裂陷Ⅱ幕应力场表现为北东-南西向挤压,裂陷Ⅲ幕应力场表现为北东东-南西西向挤压,从馆陶组开始的"裂后期"应力场变为近东西向且全区总体上表现为均匀的热沉降活动,而在明化镇组堆积时期裂陷活动又有所回升,表现为加速沉降期。通过构造应力场演化与油气成藏的关系研究表明构造应力场促进了圈闭的形成,并为次生油气藏的产生提供了有利条件。Beitang Sag had a feature of episodic subsidence. The simulation of subsidence history showed that there were several subsidence episodes in Beitang Sag. The subsidence rate and sedimentary facies were different in every subsidence episode. By comprehensive analysis of strata thickness and back-stripping, it is found out that the stress field of episode I and II are of NE-SW compression, the stress field of episode III is of NEE-SWW compression, the stress field of 'post-rift' which begins from Guantao Formation changes to EW compression, the whole area shows uniform thermal subsidence, however, the rifting intensified somewhat in Minghuazhen Formation, that is, accelerated the subsidence. Finally, by the study of the relations between the evolution of tectonic stress field and hydrocarbon accumulation, it shows that the tectonic stress field produces sags and traps, and provides favorable conditions for the formation of secondary hydrocarbon reservoirs.

关 键 词：北塘凹陷 幕式沉降 构造应力场 石油地质条件 

分 类 号：P618.13[天文地球—矿床学]