摘要
应用渤海新连片处理三维地震资料,基于构造解析理论总结渤海海域隐性断层在地震、地质剖面上的特征和构造样式,分析隐性断层的发育过程和构造成因,提出识别的思路与方法,形成了一套完整的关于渤海隐性断层成因和分析的方法体系。研究结果表明,渤海走滑-伸展双动力成盆背景下复杂的走滑断裂格局、多样的地层岩石介质属性和强烈的新构造运动改造是隐性断层发育的根本原因。渤海隐性断层按构造成因和发育部位可划分为走滑断裂主导型、伸展断裂主导型和走滑-伸展复合型3类12种,不同类型隐性断层在渤海发育具有明显分区性。沉积地层厚度不规律变化、地层继承性扭曲甚至产状突变、平面断裂组合的分带特征和同一构造(岩性)油水系统非岩性变化差异是渤海隐性断层识别的重要标志。隐性断层的发现极大地扩大了构造圈闭群规模,其密集发育区多为油气运聚活跃区和有利勘探区带,对油气成藏控制作用明显。隐性断层的发育特征与分布规律直接有效指导了渤海成熟区的勘探,发现了渤中29-6、蓬莱20-2等一批大中型油气田。
Based on the theory of structural analysis,the characteristics and structural patterns of subtle faults are studied using 3D seismic data of the Bohai Sea to analyze the development process and origin of the subtle faults.A method of identifying subtle faults is proposed,forming a complete system for analyzing origins of subtle faults in the Bohai Sea.The complex strike-slip fault patterns under the strike-slip and extension stress background,diverse formation rocks,and strong neotectonic movement are the reasons for the development of subtle faults.According to the tectonic origin and development location,the subtle faults in Bohai Sea can be divided into 12 types in the three categories of strike slip dominant,extension dominant and strike slip and extension composite,and the different types of subtle faults occur in different regions of the Bohai Sea.Unreasonable variation of sedimentary stratum thickness,inherited distortion or even abrupt change of stratum occurrence,zonation of plane fault combination,and the variation of oil-water system in the same structure with no-lithologic change are the important signs for identifying subtle faults in Bohai Sea.The subtle faults greatly enlarge the size of the structural trap groups,and areas with dense subtle faults are often active area of hydrocarbon migration and accumulation and favorable exploration zones,which have strong control on the hydrocarbon accumulation.The identification method for subtle faults has guided the exploration in the mature areas of Bohai Sea effectively,with a number of large and medium oil and gas fields discovered,such as Bozhong 29-6 and Penglai 20-2.
作者
薛永安
吕丁友
胡志伟
黄江波
任健
XUE Yongan;LYU Dingyou;HU Zhiwei;HUANG Jiangbo;REN Jian(CNOOC Tianjin Company,Tianjin 300459,China)
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2021年第2期233-246,共14页
Petroleum Exploration and Development
基金
“十三五”国家科技重大专项课题“渤海海域勘探新领域及关键技术研究”(2016ZX05024-003)
中海石油重大科技专项“渤海油田上产4 000万吨新领域勘探关键技术”(CNOOC-KJ135ZDXM36TJ08TJ)。
关键词
隐性断层
构造成因
构造发育特征
控藏作用
渤海海域
subtle fault
tectonic origin
tectonic development characteristics
hydrocarbon accumulation control
Bohai Sea
