涠西南凹陷流一段构造坡折带及其对层序、沉积相带的控制  

Control of tectonic slope-break zones in the first member of Liushagang Formation of Weixinan Sag on sequence and sedimentary systems

作　　者：刘杰 李茂 杨朝强 邹明生 漆智 方小宇 

机构地区：[1]中海石油有限公司湛江分公司,广东湛江524057

出　　处：《西安石油大学学报（自然科学版）》2014年第3期49-57,8-9,共9页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家自然科学基金(编号:40903032);中国海洋石油总公司"十二五"重大专项低渗综合科研(编号:2002I3000454)

摘　　要：通过地震剖面解释,结合钻井、测井等资料分析,在等时地层格架下进行涠西南凹陷构造坡折带对层序和沉积相控制作用的研究。分析表明:涠西南凹陷流一段发育三角洲、扇三角洲、湖相3种沉积体系,主要发育断坡带、断阶带、挠曲坡折带3种构造坡折带。这些坡折带对涠西南凹陷层序样式、沉积体系的发育位置、沉积体系展布方向与展布规模、沉积体的储集物性等具有重要控制作用。其中,挠曲坡折带和断阶带控制研究区主要砂体的展布,特别是高位三角洲或扇三角洲砂体的发育和分布,坡折带附近有利于形成砂岩透镜体、岩性上倾尖灭、地层超覆及构造-岩性圈闭等多种圈闭类型,是寻找砂岩油气藏的有利区带。The control effect of tectonic slope-break zones in the first member of Liushagang Formation of Weixinan Sag on sequence and sedimentary facies is studied under isochronous stratigraphic framework according to the interpretation of seismic profiles and the analysis of drilling and logging data. It is shown that,there developed three kinds of sedimentary systems: delta,fan delta and lacustrine facies,and three types of slope-break zones: fault ramp zone,fault terrace zone and flexure slope break zone in the first member of Liushagang Formation,Weixinan Sag. These tectonic slope-break zones have important control effect on the pattern of sequences,the distribution,direction and scale of sedimentary systems and the physical property of sedimentary bodies. The fault terrace zone and flexure slope break zone control the distribution of main sandbodies in the studied area,especially the development and distribution of highstand system tract delta and fan delta sandbodies,near the slope-break zones are favorable to form different kinds of traps,such as sandstone lens,lithologic updippinching out traps,stratigraphic overlap traps and structural lithologic complex traps,where are favorable are-as to prospect sandstone reservoirs in Weixinan Sag.

关 键 词：涠西南凹陷 流一段 构造坡折带 沉积体系 隐蔽油气藏 

分 类 号：TE121.2[石油与天然气工程—油气勘探] P618.130.2[天文地球—矿床学]