潍北凹陷走滑断裂体系特征及其控藏作用  

Characteristics of the strike-slip fault system and their control actions on the hydrocarbon accumulation for Weibei sag

作　　者：陈登超 杨贵丽 马立驰 刘晓林 辛也 田雯[1,2] 王园园 王志英 郝冉冉 CHEN Dengchao;YANG Guili;MA Lichi;LIU Xiaolin;XIN Ye;TIAN Wen;WANG Yuanyuan;WANG Zhiying;HAO Ranran(Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying,Shandong,257015;Postdoctorate Scientific Research Station,Shengli Oil Administration,SINOPEC,Dongying,Shandong,257015)

机构地区：[1]中国石化股份胜利油田分公司勘探开发研究院,山东东营257000 [2]中国石油化工集团公司胜利石油管理局博士后科研工作站,山东东营257000

出　　处：《地质学报》2020年第8期2410-2421,共12页Acta Geologica Sinica

基　　金：中国石化科技攻关项目(编号:P19027、P11067)资助的成果。

摘　　要：潍北凹陷是郯庐断裂走滑活动形成的走滑拉分盆地,走滑作用对断裂体系演化、圈闭形成及油气成藏起到了明显的控制作用。孔店组沉积时期,郯庐断裂经历了左旋走滑和右旋走滑两个阶段,不同构造演化阶段断层性质及发育程度等具有显著差异,多期走滑活动使其东部地区形成了三条南北走向的弱走滑断裂带。同时,多期次走滑活动形成了大量与走滑作用相关的圈闭,为油气聚集提供了圈闭条件。此外,郯庐断裂走滑活动直接影响了潍北凹陷油气的运聚。宏观上,油气沿走滑作用形成的北西向鼻状构造带向东南运移并聚集;微观上,油气沿右旋走滑形成的近东西向拉张断层,在"拧毛巾"作用下,自西向东运移,并被北北东向-近南北向走滑断层封堵成藏;平面上,与三个弱走滑断裂带相对应,油气藏呈现"近东西向延伸,南北带状展布"的特征。中部弱走滑断裂带北端及中段是下步重点勘探方向,西部弱走滑断裂带可作为致密砂岩油藏和页岩油气的攻关地区。Weibei Sag was a strike-slip pull-apart basin, which formed by the strike-slip actives of the Tan-lu fault, and the strike-slip actives played an important role on the evolution of fault system, the formation of the traps, and the hydrocarbon accumulation in Weibei Sag. During the sedimentation of Kongdian formation, Weibei Sag successively experienced sinistral strike-slip and right-lateral strike-slip, the characteristics and development of the fault in different tectonic evolution stage showed significant difference, and the multi-strike-slip activities caused the formation of three weak strike-slip belts in the east part of Weibei sag. Meanwhile, the the multi-strike-slip activities also leaded to the formation and evolution of massive traps of different types, so the oil&gas could accumulated in them. In addition, the activities of Tan-lu fault controlled the hydrocarbon accumulation in Weibei Sag. Macroscopic view, oil&gas migrated to the southeast and accumulated in the Zaohu nose structure belt, which was uplifted according to the strike-slip activities. In microscopic scales, due to the strike-slip rotation-shearing actions, the oil and gas migrated from west to east along the tensile fault in east-west direction, and sealed by the strike-slip fault in south-north direction. Corresponding to the three weak strike-slip fault belts, the planar distribution of oil and gas in Kongdian formation showed characteristics of "extend in east-west direction" and "zonal distribution in south-north direction". The middle & north part of the middle weak strike-slip fault belt is the key exploration direction for Weibei Sag at present, and the west weak strike-slip fault belt could to be the study area for tight stone reservoirs and shale oil and gas.

关 键 词：潍北凹陷 走滑断裂体系 控藏作用 油藏展布规律 勘探方向 

分 类 号：P618.13[天文地球—矿床学]