南堡凹陷油气分布有序性与差异富集主控因素  

Orderly distribution of oil and gas and the main controlling factors for the differential hydrocarbon enrichment in Nanpu Sag

作　　者：刘国勇[1] 刘华[2] 陈蕾[1] 孟令箭[1] 刘景东[2] 欧阳冠宇 刘海青[1] Liu Guoyong;Liu Hua;Chen Lei;Meng Lingjian;Liu Jingdong;Ouyang Guanyu;Liu Haiqing(PetroChina Jidong Oilfield Company;School of Geosciences,China University of Petroleum(East China))

机构地区：[1]中国石油冀东油田公司 [2]中国石油大学(华东)地球科学与技术学院

出　　处：《中国石油勘探》2024年第2期112-122,共11页China Petroleum Exploration

基　　金：中国石油“十四五”重大科技项目“成熟探区精细勘探关键技术研究”下属课题“冀东凹陷断陷湖盆油气分布有序性规律与评价技术研究”(2021DJ0704);中国石油冀东油田公司重大科技项目“南堡凹陷关键成藏条件评价及油气富集规律研究”(KT2022A01)。

摘　　要：油气分布有序性是表征油气差异富集规律的重要途径,能够为寻找接替方向提供重要依据。通过开展油气藏类型、油气性质、油气富集程度、油气输导体系和断—盖条件等多角度的系统分析,揭示了南堡凹陷油气分布有序性与差异富集的主要控制因素。研究表明,南堡凹陷从次凹中心向边缘,表现出由岩性油气藏向构造油气藏、原油性质逐渐变差、富集层系逐渐变浅的有序变化。断陷期、坳陷期的构造活动控制了烃源岩的分布与演化,构造演化控制了凹陷沉积体系从而控制储盖组合分布和圈闭类型,其中源下、源内和源上3类储盖组合为多层系油气分布奠定了基础;纵横向输导体系和断—盖配置差异,控制了不同构造带油气运聚过程,形成了凹陷中部源下富集、凹陷边缘源上富集的总体规律。研究成果进一步揭示了该凹陷的油气分布规律性,可为成熟探区的精细勘探提供理论指导和借鉴意义。The distribution order of oil and gas is a major means to characterize the law of differential hydrocarbon enrichment,providing an important basis for the identification of replacement orientations.The systematic analysis has been conducted,including oil and gas reservoir types,oil and gas properties,degree of hydrocarbon enrichment,hydrocarbon transport system and fault-cap rock conditions,which supports to determine the main controlling factors for the orderly distribution and differential enrichment of oil and gas in Nanpu Sag.The study results show that,from the center to the margin of sub-sags in Nanpu Sag,it shows an orderly change from lithologic oil and gas reservoirs to structural oil and gas reservoirs,the crude oil properties gradually deteriorate,and hydrocarbon gradually enriches in shallower formations.The tectonic activities during the fault and depression periods controlled the distribution and evolution of source rocks,and the tectonic evolution controlled the sedimentary system in the sag and the distribution of reservoir-cap rock combinations and trap type.Among them,three types of reservoir-cap rock combinations below,within and above source rock laid the foundation for multi-layer hydrocarbon distribution.The vertical and lateral transport system and the differential fault-cap rock configuration controlled the process of hydrocarbon migration and accumulation in different structural belts,forming the general law of hydrocarbon enrichment below source rock in the central sag and above source rock in the marginal sag.The study results further reveal the regular distribution of oil and gas in the sag,which provide theoretical guidance and reference for the fine exploration in mature exploration areas.

关 键 词：南堡凹陷 油气分布有序性 成藏要素 输导体系 油气差异富集 

分 类 号：TE112.1[石油与天然气工程—油气勘探]