塔河油田奥陶系走滑断裂体系特征及成因机制  

Characteristics and genetic mechanism of the strike-slip fault system in the Ordovician of the Tahe oilfield

作　　者：马庆佑 曾联波[1,2] 徐旭辉[4] 耿锋[3] 童亨茂[1,2] 蒋华山[3] 肖坤泽[1,2] MA Qingyou;ZENG Lianbo;XU Xuhui;GENG Feng;TONG Hengmao;JIANG Huashan;XIAO Kunze(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petrolem(Beijing),Beijing 102249,China;College of Geosciences,China University of Petrolem(Beijing),Beijing 102249,China;Northwest Oilfield Branch of SINOPEC,Urumqi,Xinjiang 830011,China;Geophysical Research Institute of SINOPEC,Nanjing,Jiangsu 211100,China)

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [2]中国石油大学(北京)地球科学学院,北京102249 [3]中国石化西北油田分公司,新疆乌鲁木齐830011 [4]中国石化石油物探技术研究院,江苏南京211100

出　　处：《地质学报》2023年第2期496-506,共11页Acta Geologica Sinica

基　　金：国家自然科学基金项目(编号U21B2062);国家科技重大专项项目(编号2017ZX05005-002);中石化科技部项目(编号P20062-2)联合资助的成果。

摘　　要：塔河油田奥陶系“断溶体”油藏是塔里木盆地油气勘探开发的重要对象。本文对塔河油田10区西、于奇西、于奇8井三块三维地震资料开展了精细的走滑断裂构造解析,并在此基础上对塔河油田走滑断裂体系的形成演化过程与成因机制有新认识。研究结果表明:(1)除了在塔河油田南部10区西、托普台等区块发育典型的“X”型共轭走滑断裂体系外,首次发现塔河油田北部于奇地区发育非对称式共轭走滑断裂体系,据此划分出塔河油田南、北两大走滑断裂体系,但两者在形成时间、最大主应力方向、动力学来源等方面均存在明显差异;(2)两大走滑断裂体系的形成及演化过程大致分为3个阶段:加里东期中期I幕形成南部NNE、NNW两组走向的“X”型共轭走滑断裂体系,最大主压应力方向为N3°E,主要受到西昆仑洋俯冲消减作用产生的由S向N的挤压应力;加里东期晚期—海西期早期形成北部以近NE走向为主、少量SN走向组成的非对称式共轭走滑断裂体系,最大主压应力方向为N23°E,主要受到南天山洋俯冲消减作用产生的由N向S的挤压应力,海西期晚期继承性活动,主应力方向保持不变;印支期—燕山期两大走滑断裂体系继承性活动,最大主压应力方向为N37°E,主要受到南部古特提斯洋闭合作用产生的由S向N的挤压应力;(3)运用广义剪切活动准则的理论和方法,半定量分析了10区西F1(NNE走向)、F2(NNW走向)两组“X”型共轭走滑断裂在不同时期的性质和活动性:加里东期中期I幕,F1(NNE走向)、F2(NNW走向)两组断裂初始形成,均为剪切作用下的库仑破裂(活动性系数fa=1.0);加里东期晚期—海西期,F2(NNW走向)断裂压扭活动(活动性系数fa=1.1),F1(NNE走向)断裂整体不活动(活动性系数fa=0);印支期—燕山期,F1(NNE走向)断裂发生张扭活动(活动性系数fa=2.1),F2(NNW走向)断裂整体活动较弱(活动性系数fa=0.6)。因�The Ordovician fault-karst reservoirs in Tahe oilfield is an important object of oil and gas exploration and development in Tarim Basin.The paper analyzes the strike-slip faults in the western area of Block 10,Yuqi and the area of Yuqi 8 well in Tahe oilfield from the 3D seismic data.On this basis,a new understanding of the formation,evolution and genesis mechanism of the strike-slip fault system in Tahe oilfield is obtained.The results show that:(1)In addition to the typical“X”type symmetric conjugate strike-slip fault system developed in the area of Block 10 and the Tuoputai in the south of the Tahe oilfield,the asymmetric conjugate strike-slip fault system has been discovered in the Yuqi area in north of Tahe oilfield for the first time.According to this,the south and north strike-slip fault systems in Tahe oilfield are divided.However,there are obvious differences in the formation time,maximum principal stress direction and dynamic source of the two fault systems.(2)The formation and evolution of the two strike-slip fault systems can be divided into three stages:the two groups of symmetrical“X”conjugate strike-slip fault systems of NNE and NNW formed in the south of the middle Caledonian(Stage I),which were mainly affected by the subduction of the West Kunlun Ocean,and the maximum principal compressive stress direction was N3°E;Late caledonian to early hercynian produced mainly by the south tianshan ocean subduction subduction of the extrusion from N to S form of maximum principal compressive stress direction for N23°north nearly NE was given priority to,a small amount of SN to non symmetric conjugate strike-slip fracture system and late hercynian inherited but principal stress direction remains the same;The indosinian and Yanshanian strike-slip fault systems were mainly affected by the closure of the Southern Tethyan Ocean,resulting in the continuous activities of the two strike-slip fault systems,and the maximum principal compressive stress direction was N37°E.(3)The properties and activities of

关 键 词：“X”型共轭走滑断裂体系 形成演化 成因机制 广义断层模式 塔河油田 

分 类 号：P618.13[天文地球—矿床学]