洛伊凹陷西南部边界大断裂发育特征及其对油气成藏的控制作用  

Development characteristics of large fault in southwest boundary of Luoyi Sag and its controlling effect on hydrocarbon accumulation

作　　者：于浩雨 于明德 李洲[3] 熊亮 YU Haoyu;YU Mingde;LI Zhou;XIONG Liang(Natural Resources,Guangzhou Marine Geological Survey,Guangzhou City,Guangdong Province,510075,China;Exploration&Development Research Institute,Henan Oilfield Company,SINOPEC,Zhengzhou City,Henan Province,450000,China;Petroleum Engineering Research Institute,Henan Oilfield Company,SINOPEC,Nanyang City,Henan Province,473132,China)

机构地区：[1]自然资源部广州海洋地质调查局,广东广州510075 [2]中国石化河南油田分公司勘探开发研究院,河南郑州450000 [3]中国石化河南油田分公司石油工程技术研究院,河南南阳473132

出　　处：《油气地质与采收率》2020年第5期13-24,共12页Petroleum Geology and Recovery Efficiency

基　　金：中国地质调查局重大科研项目“全国油气资源战略选区调查与评价”子项目“周口及周缘油气勘探目的层格局分布和目标优选研究”(1211302108023)。

摘　　要：洛伊凹陷在上三叠统试采获天然气流,为弄清其西南部边界大断裂发育特征及油气成烃、成储、成藏特点,在大量钻井/钻孔、关键地质露头和新老二维地震资料分析基础上,利用地震地质综合分析法和断裂及盆地动力学分析手段,剖析了洛伊凹陷西南部边界大断裂发育特征、演化阶段及其对油气成藏的控制作用。结果表明:①义伊断裂是一条区域性的复杂深大断裂,分为叠瓦状强烈逆冲推覆段、逆冲挤压叠加后期负反转段、多角度叠瓦状强烈逆冲推覆叠加走滑构造段、不对称牛轭-叠瓦状较强逆冲推覆段共4段;②洛伊凹陷经历了海西中晚期弱伸展裂陷、印支早期弱挤压隆升变形、印支晚期不均衡整体拗陷、燕山期强烈的逆冲推覆-隆升剥蚀、喜马拉雅期左旋走滑裂陷等5个构造演化阶段;③义伊断裂的构造活动控制着研究区二叠系、上三叠统和中下侏罗统烃源岩发育特点、生烃阶段、沿构造转换带有利储层的发育及致密砂岩储层的裂缝化改造,同时,此断裂对油气成藏也有破坏作用;④义马次凹北部等3个区带是二叠系和中生界油气成藏的较有利区带。Natural gas flow was obtained during the production test in the Upper Triassic in Luoyi Sag.In order to clarify the development characteristics of the large boundary fault,hydrocarbon generation,reservoir formation and hydrocarbon accumulation,based on the analysis of a large number of drilling,boreholes,key outcrops and new and old 2D seismic data,the development characteristics,evolutionary stages and the controlling effect on hydrocarbon accumulation of the southwest boundary fault in Luoyi Sag are studied in detail according to the seismic and geological data,fault patterns and basin dynamics.The results indicate that①Fault YY is a complex regional deep fault,which can be divided into four sections:imbricated strong overthrusting section,negative inversion section after trust and extrusion,multi-angle imbricated strong overthrust superimposed strike-slip structural section,and asymmetric ox-imbricated strong overthrust section.②Luoyi Sag has experienced five stages of structural evolution:weak extensional rifting in the middle and late Hercynian period,weak compression and uplift deformation in the early Indosinian period,unbalanced depression in the late Indosinian period,strong overthrust uplift and denudation in the Yanshanian period,and sinistral strike slip rifting in the Himalayan period.③The tectonic activities of Fault YY not only controls the development characteristics of hydrocarbon source rock in Permian,Triassic and lower-middle Jurassic,and multiple secondary hydrocarbon stages in late Indosinian and Yanshan-Himalayan period,but also controls the development series of strata and zones of favorable reservoirs such as underwater distributary channel sandstone along the tectonic transformation belt,as well as the fracture transformation of tight sandstone reservoirs.Meantime,the fractures also has a destructive effect on the hydrocarbon accumulation of Permian and Mesozoic periods in the study area.④The three zones in the north of Yima sub-sag are more favorable for hydrocarbon accumulation

关 键 词：边界大断裂 上三叠统 二维地震 逆冲推覆 走滑裂陷 褶皱变形 油气成藏 洛伊凹陷 

分 类 号：TE122.31[石油与天然气工程—油气勘探]