东营凹陷古近系构造转换及其对盆地控制作用

doi:10.3969/j.issn.1672-7703.2020.06.005

摘要/Abstract

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。

关键词: 东营凹陷, 构造体制转换, 转换样式, 控盆作用, 古近系

Abstract: During the Paleogene, the Dongying Sag experienced multiple episodes of tectonic movement. This tectonic activity transformed the structural system in the sag, controlling its shape and the distribution of strata and sand bodies. This study analyses and describes the geological features of the sag before and after its structural transformation. In doing so it examines the fault styles and structural assemblage characteristics, stratigraphic framework and distribution laws, paleogeomorphology and subsidence center change, and the characteristics of the fault system. The results show that: (1) In the Paleogene, the Dongying Sag experienced a structural transformation from extension to strike slip-extension. The bottom horizon of the upper fourth member of the Shahejie Formation (T7x) is an important interface of this structural transformation. (2) The structural transformation styles and genetic mechanisms of the strike-slip-extension stage in the study area are determined. The structural transformation styles are divided into four categories. (3) The controlling effect of the structural transformation is identified. In terms of the stratigraphic system, the structural transformation surfaces are the discontinuous surfaces of formations, which formed unconformity surfaces. Vertically, the structural configuration of the sag changed both before and after the structural transformation, and the subsidence center migrated. On the plane, the structural transfer zone was the sedimentary transition zone, which divided the sedimentary systems into segments.

中图分类号:

邱贻博, 贾光华, 刘晓峰, 刘鑫金, 孙锡年, 孙红蕾. 东营凹陷古近系构造转换及其对盆地控制作用[J]. 中国石油勘探, 2020, 25(6): 50-57.

Qiu Yibo, Jia Guanghua, Liu Xiaofeng, Liu Xinjin, Sun Xinian , Sun Honglei. Structural transformation in the Paleogene and its controlling effect in Dongying sag[J]. China Petroleum Exploration, 2020, 25(6): 50-57.

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