天然气与石油2025，Vol.43Issue(2)：58-65,8.DOI:10.3969/j.issn.1006-5539.2025.02.008
西湖凹陷平湖斜坡带平湖组断裂展布与控砂模式研究
Study on fault distribution and sand-controlling pattern of the Pinghu Formation in the Pinghu Slope Zone of the Xihu Sag
摘要
Abstract
The coal-rich strata of the Pinghu Formation in the Xihu Sag exhibit a sand content ranging from 20%to 40%.Identifying large-scale sand bodies is crucial for enhancing exploration efficiency.Since the Pinghu Formation is in the fault transition period,fault activity has a significant control on sedimentary filling and sand body distribution.In order to clarify how the structural transition zone,composed of the synsedimentary fault system during the deposition of the Pinghu Formation,controls sand and facies,a study was conducted based on 3D seismic data interpretation and drilling data analysis.This study focused on the fault structure style,structural evolution and distribution in the Kongbao area of the Pinghu Formation within the Pinghu Slope Belt,as well as the types of faults and transition zones in the Kongbao area,and the control effects of structural transition zones and paleogeomorphology on sand bodies.The results show that the Pinghu Slope Zone can be divided into the Kongnan forward fault-step zone,the Baowu trough-horst complex area and the Pingtuan steep slope near-sag area.The faults in the Kongbao area are predominantly grade Ⅱ-Ⅳ faults and minor faults.The sand-controlling modes of the structural transition zone include the fault-step transition zone,the slope-break type transition zone and the reverse fault-step transition zone.The paleogeomorphological sand-controlling modes include the slope-break zone,the"grape-type"fault trough and the fault depression.These results provide a basis for oil and gas exploration in this area.关键词
平湖斜坡带/平湖组/构造演化/断裂展布/控砂模式Key words
Pinghu Slope Zone/Pinghu Formation/Tectonic evolution/Fault distribution/Sand-controlling pattern引用本文复制引用
黄启彰,李文俊,刘春锋,胡碧瑶..西湖凹陷平湖斜坡带平湖组断裂展布与控砂模式研究[J].天然气与石油,2025,43(2):58-65,8.基金项目
国家自然科学基金"东海深层低渗—致密气储层体系质量差异成因机制及演化模式"(U19B2006) （U19B2006）
