东营凹陷古近系构造转换及其对盆地控制作用  

Structural transformation in Paleogene and its controlling effect in Dongying sag

作　　者：邱贻博[1] 贾光华[1] 刘晓峰[2] 刘鑫金[1] 孙锡年 孙红蕾 Qiu Yibo;Jia Guanghua;Liu Xiaofeng;Liu Xinjin;Sun Xinian;Sun Honglei(Research Institute of Exploration and Development,Sinopec Shengli Oilfield Company;China University of Geosciences(Wuhan))

机构地区：[1]中国石化胜利油田分公司勘探开发研究院 [2]中国地质大学(武汉)

出　　处：《中国石油勘探》2020年第6期50-57,共8页China Petroleum Exploration

基　　金：国家科技重大专项“渤海湾盆地精细勘探关键技术”(2016ZX05006)。

摘　　要：东营凹陷古近纪经历多期构造运动,导致盆内构造体制发生明显转换,控制了盆地形态、地层及砂体展布。在断裂构造样式及组合特征、地层格架及展布规律、古地貌形态及沉降中心剖析的基础上,进一步明确构造体制转换前后研究区断裂体系、构造格局、地层展布及沉降中心的变化特征。研究表明:①东营凹陷古近纪经历了由伸展到走滑—伸展的构造变革,其中沙四上亚段底(T7x)是其重要的构造变革界面。②明确了研究区走滑—伸展阶段构造转换样式及成因机制,实现了四大类构造转换样式的分类。③明确了构造转换对盆地的控制作用,层系上构造转换面是地层的突变面,形成不整合面;纵向上构造转换前后盆地构造形态发生变化,沉降中心迁移;平面上构造转换带是沉积的过渡带,分割沉积体系。During the Paleogene, the Dongying sag experienced multiple tectonic movements. Tectonic regime transformed obviously, which controlled the shape of the sag and the distribution of strata and sand bodies. Through the analysis of fault style and structural assemblage characteristics, stratigraphic framework and distribution laws, paleogeomorphology and subsidence center, the change characteristics of fault system, structural pattern, stratigraphic distribution and subsidence center before and after the transformation of tectonic regime are further clarified. Study shows that:(1) In Paleogene, the Dongying sag experienced a structural transformation from extension to strike slip-extension. The bottom horizon of upper fourth member of Shahejie Formation(T7 x) is an important interface of structural transformation.(2) The structural transformation style and genetic mechanism of the strike slip-extension stage in the study area are determined. The structural transformation styles can be divided into four categories.(3) The control of structural transformation on the sag is defined. In terms of stratigraphic system, the structural transformation surface is the discontinuous surface of formations, forming the unconformity surface. Vertically, the structural configuration of the sag changed before and after the structural transformation, and the subsidence center migrated. On the plane, the structural transfer zone was the sedimentary transition zone, which segmented the sedimentary systems.

关 键 词：东营凹陷 构造体制转换 转换样式 控盆作用 古近系 

分 类 号：TE111.2[石油与天然气工程—油气勘探]