南襄盆地泌阳凹陷古近系核桃园组油气充注幕次及成藏年龄确定  

Hydrocarbon charging events and timing in Paleogene Hetaoyuan Formation,Biyang Sag,Nanxiang Basin

作　　者：朱颜[1] 李风勋 陈红汉[3] 赵莹彬[1] 李丽娟[1] 郑融[1] 卜旭强 ZHU Yan;LI Fengxun;CHEN Honghan;ZHAO Yingbin;LI Lijuan;ZHENG Rong;BU Xuqiang(Research Institute of Exploration and Development,Henan Oilfield Company,SINOPEC,Zhengzhou,Henan 450000,China;Wuxi Research Institute of Petroleum Geology,SINOPEC,Wuxi,Jiangsu 214126,China;School of Earth Resources,China University of Geosciences,Wuhan,Hubei 430074,China)

机构地区：[1]中国石化河南油田分公司勘探开发研究院,郑州450000 [2]中国石化石油勘探开发研究院无锡石油地质研究所,江苏无锡214126 [3]中国地质大学(武汉)资源学院,武汉430074

出　　处：《石油实验地质》2021年第1期112-120,共9页Petroleum Geology & Experiment

基　　金：国土资源部项目(1A14YQKYQ0107);中国石化重大科技攻关项目(ZDP17012)联合资助。

摘　　要：前人研究认为南襄盆地的构造对油气成藏具有控制作用,但针对油藏确切的形成时间及其与构造运动的耦合关系一直不明确。通过对流体包裹体的系统分析,利用埋藏史投影法,明确泌阳凹陷古近系核桃园组油气充注幕次和成藏期次,确定其成藏年代。泌阳凹陷共有“四幕两期油、一幕天然气”充注,第一期为泌阳凹陷的主要成藏期,主要发生在断陷—抬升阶段,包括第一幕(36.1~23.5 Ma)、第二幕(34.1~21.2 Ma)和第三幕(30.9~16.2 Ma)成藏,具有多阶连续性充注特点;第二期发生在拗陷沉降阶段,即第四幕(7.9~0.2 Ma)油和一幕(3.0~0.8 Ma)天然气成藏。泌阳凹陷内部的不同构造区带的油气充注时间存在差异,中部深凹区和南部陡坡带距离生烃中心较近,优先充注早期成藏;而北部斜坡带成藏时期相对较晚。泌阳凹陷南部应加强纵向多层位、多期次立体勘探,中部加强隐蔽岩性勘探的攻关力度,北部重点加强次生或调整的构造油藏勘探。Previous studies showed that the structure of Nanxiang Basin controlled the formation of oil and gas reservoirs,but the exact formation time of the reservoir and its coupling relationship with structural movement are not clear yet.Therefore,by analyzing the fluid inclusion system and combining with the projection method of burial history,this paper analyzed the times of oil and gas charging and accumulation in the Paleogene Hetaoyuan Formation of the Biyang Sag,and determined the age of oil and gas accumulation.The results showed that there were four phases of oil charging in two stages and one phase of natural gas charging in the Biyang Sag.The first stage mainly occurred during fault depression and uplift,including the first phase(36.1-23.5 Ma),the second phase(34.1-21.2 Ma)and the third phase(30.9-16.2 Ma)of oil charging,with the characteristics of multiphase continuous charging.The second stage occurred during depression subsidence,including the fourth phase(7.9-0.2 Ma)of oil charging and the first phase(3.0-0.8 Ma)of natural gas charging.The early stage(the first phase)was the main formation time of oil and gas reservoirs in the Biyang Sag.The charging time of oil and gas was different in different structural zones in the Biyang Sag.The central deep subsided area and the southern slope were closer to the hydrocarbongenerating center,and were charged earlier,while the northern slope was charged relatively late.Therefore,it is recommended to focus on strengthening the vertical multilayer and multistage threedimensional exploration in the southern part of the Biyang Sag,strengthening the exploration of subtle lithology in the center,and focusing on the exploration of secondary or adjusted structural reservoirs in the north.

关 键 词：流体包裹体 油气充注幕次 成藏年龄 核桃园组 泌阳凹陷 南襄盆地 

分 类 号：TE122.3[石油与天然气工程—油气勘探]