珠江口盆地惠州凹陷构造变换带发育特征及其控油气作用  

Characteristics and influences on hydrocarbon accumulation of transfer zones in Huizhou sag,Pearl River Mouth basin

作　　者：彭光荣 牛胜利 邱欣卫 何雁兵 唐旭 余一欣[2,3] PENG Guangrong;NIU Shengli;QIU Xinwei;HE Yanbing;TANG Xu;YU Yixin(CNOOC China Limited,Shenzhen Branch,Shenzhen,Guangdong 518000,China;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing,Beijing 102249,China;College of Geosciences,China University of Petroleum,Beijing,Beijing 102249,China)

机构地区：[1]中海石油(中国)有限公司深圳分公司,广东深圳518000 [2]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [3]中国石油大学(北京)地球科学学院,北京102249

出　　处：《中国海上油气》2023年第4期12-23,共12页China Offshore Oil and Gas

基　　金：中海石油(中国)有限公司深圳分公司综合科研项目“高角度型凹陷古近系优质储层条件及油气富集规律研究(编号:CCL2020SZPS0168)”部分研究成果。

摘　　要：珠江口盆地惠州凹陷西南部断裂发育,并发生相互作用形成了多种类型的构造变换带,对油气成藏也产生了重要影响。本文通过三维地震资料解释和构造编图,对惠州凹陷西南部构造变换带类型、分布特征及其对油气成藏的控制作用进行了分析。惠西南地区主要发育软连接型和硬连接型两大类构造变换带,根据断层倾向组合特征和硬连接作用方式可进一步划分出同向叠覆型、对向叠覆型、背向叠覆型、同向共线凹型、同向共线凸型和变换断层型等6类。软连接型构造变换带发育于两条控洼断层的相互叠接区,形成变换斜坡或断槽,变换带处多发育地层翘倾并新生小规模次级断层以保持区域应变守恒。硬连接型构造变换带位于控洼断层内部,断层位移-距离曲线在变换带处呈明显低值区,断层下降盘发育横向背斜。在惠西南地区共识别出8个软连接型变换带和8个硬连接型变换带,而且受裂陷I幕沉积中心迁移及断层活动速率变化影响,南部变换带数量更多。构造变换带不仅控制了局部砂体和储层的发育,还伴生多种类型构造圈闭及岩性圈闭,变换斜坡也为油气运移提供了优势通道。勘探实践证实,软连接型变换带的成藏效果优于硬连接型变换带。深入分析惠西南地区构造变换带发育特征及其控藏作用,对该地区下一步油气勘探具有重要指导意义。Faults developed in the southwest of Huizhou sag of Pearl River Mouth basin and formed various types of transfer zones through interaction,which also had an important influence on hydrocarbon accumulation.Based on the interpretation of 3D seismic data and structural mapping,this paper analyzes the types,distribution characteristics and its controlling effects of transfer zones on hydrocarbon accumulation in the southwest of Huizhou sag.There are two main types of transfer zones in the southwest of Huizhou sag,including soft-linked type and hard-linked type.According to the characteristics of fault dip combination and hard-linked action mode,six types of transfer zones can be further divided into the same overlap type,the opposite overlap type,the back overlap type,the same collinear concave type,the same collinear convex type,and the transfer fault type.The soft-linked transfer zone is developed in the overlapping area of two sag-controlled faults,forming a transfer slope or fault trough.In the transfer zone,the strata tilt and small-scale secondary faults are mainly developed to maintain the conservation of regional strain.The hard-linked transfer zone is located inside the sag-controlled fault.The displace-distance curve of the fault is obviously low in the transfer zone,and a transverse anticline develops in the hanging wall.There are eight soft-linked transfer zones and eight hard-linked transfer zones in the study area,which are controlled by the migration of depocenter and fault activity rate change in the rift I stage,and the transfer zones are more developed in the southern part of the sag.The transfer zones not only control the development of local sand bodies and reservoirs,but also produce various types of structural and lithologic traps.The transfer slope also provides a favorable channel for hydrocarbon migration.The exploration practice proves that the accumulation effect of soft-linked transfer zones is better than that of hard-linked transfer zones.The further analysis of the development character

关 键 词：构造变换带 软连接 硬连接 控藏作用 惠州凹陷 珠江口盆地 

分 类 号：TE121.2[石油与天然气工程—油气勘探]