歧口凹陷第三系层序格架下的油气藏富集规律  

Analysis of the Hydrocarbon Enrichment Regularity in the Sequence Stratigraphic Framework of Tertiary in Qikou Sag

作　　者：黄传炎[1,2] 王华[1] 吴永平[3] 陈思[1] 王家豪[1] 任陪罡[1] 夏存银[1] 

机构地区：[1]中国地质大学构造与油气资源教育部重点实验室/资源学院,武汉430074 [2]中国地质大学地质过程与矿产资源国家重点实验室,武汉430074 [3]中国石油天然气股份有限公司大港油田分公司,天津300280

出　　处：《吉林大学学报（地球科学版）》2010年第5期986-995,共10页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(40872077);构造与油气资源教育部重点实验室基金项目(TPR-2009-19);中国地质大学(武汉)地质过程与矿产资源国家重点实验室基金项目(GPMR200913)

摘　　要：从层序地层学的角度出发,对歧口凹陷内1340口钻井进行筛选,将钻井现已揭示的油气藏投影到层序格架中,对油气藏的富集特征进行分析。研究表明:歧口凹陷油气主要富集在二级层序界面附近,距离二级层序界面越近油气越富集。在层序内部,油气主要富集在最大湖泛面以下的湖扩体系域与低位体系域中。在各个层序中又有一定的差异:二级层序界面以上,油气主要富集在层序内部最大湖泛面以下的湖扩体系域与低位体系域中;在二级层序界面以下,主要富集在高位体系域中。平面上,油气藏主要富集在凹陷边缘断层控制的陡坡带附近,挠曲坡折带油气藏富集最少,但岩性油气藏勘探潜力巨大。据此,作者提出了三元耦合控有利勘探区带的设想,即二级层序界面+相应的三级层序体系域+可对比的凹陷坡折带类型=油气勘探有利场所。Based on sequence stratigraphy,according to 1 340 wells,the authors analyzed the characteristic of hydrocarbon reservoirs enrichment in the sequence stratigraphic framework in Qikou sag.The research shows that hydrocarbon reservoirs enriched near the second order sequence interface in Qikou sag.The closer to the second order sequence interface,the more enriched the hydrocarbon was.In the internal sequence,hydrocarbon reservoirs mainly enriched in lacustrine expanding system tract and low stand system tract.However,each sequence presented some differences.Above the second order sequence interface,hydrocarbon reservoirs mainly enriched in lacustrine expanding system tract and low stand system tract which were under the maximum flooding surface.Under the second order sequence interface,hydrocarbon reservoirs mainly enriched in high stand system tracts.On the plane,hydrocarbon reservoirs mainly congregated near steep slope zone which was controlled by sag marginal fault.The flexure slope break was the least hydrocarbon enrichment zone,but the exploration potential of lithologic reservoirs was huge.Hereby,the author proposed the thought that second order sequence interface＋corresponding system tract in the third sequence＋correlatable sag slope break types=favorable exploration zone.It is the three elements coupling controlled the favorable exploration zone.

关 键 词：油气藏 层序地层学 三元耦合 歧口凹陷 第三系 

分 类 号：P618.13[天文地球—矿床学]