琼东南盆地深水区松南区块新生代构造-沉积演化特征研究  

The characteristics of cenozoic tectonic-sedimentary evolution of Songnan low uplift in deep water area of Qiongdongnan basin

作　　者：周欣 曹俊兴[1,2] 王兴建 王俊[1] 廖万平[1] 杨金海 ZHOU Xin;CAO Junxing;WANG Xingjian;WANG Jun;LIAO Wanping;YANG Jinhai(Chengdu University of Technology College of Geophysics,Chengdu 610059,China;Chengdu University of Technology State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu 610059,China;Research Institute of Zhanjiang Branch of CNOOC(China)Co.,Ltd.,Zhanjiang 524000,China)

机构地区：[1]成都理工大学地球物理学院,成都610059 [2]成都理工大学油气藏地质及开发工程国家重点实验室,成都610059 [3]中海石油(中国)有限公司湛江分公司研究院,湛江524000

出　　处：《物探化探计算技术》2021年第5期563-572,共10页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：国家自然科学基金重点项目(42030812)。

摘　　要：松南区块古近系为近几年新发现的一套油气藏勘探的潜力层系,在琼东南盆地是重点勘探目标之一。深水盆地油气勘探的难点之一是其构造演化复杂多变且发育多种沉积体系。这里从测井、录井、岩芯、地震等资料入手,对研究区新生代构造沉积演化及沉积相特征进行分析,研究认为琼东南盆地松南低凸起新生代构造演化可分为两大体系:①古近系裂陷期形成的阶状正断体系;②新近系热沉降期形成的大型滑塌正断体系。区内沉积体系亦可分为两个阶段:①古近系崖城组沉积时期发育的近物源的扇三角洲沉积体系;②古近系陵水组至新近系梅山组沉积时期受全球海侵影响发育的浅海陆棚沉积体系。研究认为区内构造运动对沉积具有控制作用,为沉积提供了容纳空间,同时沉积差异压实亦可使断层重新活动,进而对区内构造进行改造。对研究区内YL-A井进行单井沉积相特征分析,于研究区内新生代共识别出了扇三角洲、浅海沉积相,扇三角洲平原、陆棚亚相,以及分流河道、陆棚泥等沉积微相,并据此建立了研究区西南方向物源条件下的扇三角洲沉积模式,能较直观地展现出研究区内新生代扇三角洲沉积相扇体发育特征与各沉积微相发育位置空间展布关系,以期为研究区下一步勘探提供借鉴。The paleogene in the Songnan block is a newly discovered set of potential reservoirs for oil and gas exploration in recent years.It is one of the key exploration targets in the Qiongdongnan basin.One of the difficulties in oil and gas exploration in deep water basins is that their structural evolution is often complex and changeable,and a variety of deposition systems are developed.Based on logging,logging,core,and seismic data,the Cenozoic tectonic and sedimentary evolution and characteristics of sedimentary facies were analyzed in the study area.We find that the Cenozoic tectonic evolution of the Songnan low uplift in the Qiongdongnan basin can be divided into two major systems:1)stepped normal fault system formed during the Paleogene rift period;and 2)large-scale collapse normal fault system formed during the neogene thermal subsidence period;the depositional system in the area can also be divided into two stages:1)paleogene,the near-source fan delta deposition system developed during the deposition period of the Yacheng formation;and 2)the shallow sea shelf deposition system developed during the deposition period from the paleogene Lingshui formation to the neogene Meishan formation under the influence of global transgression.Affected by tectonic movements,the sedimentation differentiation in the study area is obvious,mainly manifested in the two major aspects of sedimentary stratum thickness and stratum structure.The tectonic background in the region have an effect on controlling sedimentation,which can provide corresponding accommodation space for sedimentation.At the same time,the sedimentary differential pressure.In fact,the fault can be reactivated,and the structure in the area can be transformed.Then by analyzing the characteristics of the sedimentary facies of well YL-A in the study area,the cenozoic in the study area identified fan delta and shallow sea sedimentary facies,fan delta plain and continental shelf subfacies,distributary channels,distributary channel channels and sedimentary microfacies suc

关 键 词：构造演化 扇三角洲 分流河道 松南区块 琼东南盆地 

分 类 号：P631.4[天文地球—地质矿产勘探]