新生界盐相关构造样式及勘探潜力——以库车前陆盆地秋里塔格构造带东段为例  

Cenozoic salt-related structural styles and exploration potential:A case of the eastern part of the Qiulitage structural belt in the Kuqa foreland basin

作　　者：赵怀博 陈书平[1,2] 袁浩伟 王新艳 罗彩明[3] 王凡 姚熙强 李茜 段云江[3] ZHAO Huaibo;CHEN Shuping;YUAN Haowei;WANG Xinyan;LUO Caiming;WANG Fan;YAO Xiqiang;LI Xi;DUAN Yunjiang(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;Petroleum Exploration and Development Research Institute of Tarim Oilfield Company,PetroChina,Korla,Xinjiang 841000,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]中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000

出　　处：《中国矿业大学学报》2023年第1期113-127,共15页Journal of China University of Mining & Technology

基　　金：国家重点研发计划(2017YFC0603105);国家自然科学基金项目(42172138);中国石油天然气股份有限公司塔里木油田分公司项目(041020050022)。

摘　　要：为了明确库车前陆盆地秋里塔格构造带东段新生界盐相关构造样式及盐下有利构造圈闭,本文综合地震解释、平衡剖面恢复、地质力学以及盐构造解析等技术,深入剖析了秋里塔格构造带东段及周边地区构造特征,分析了构造活动期次及变形机理,总结了油气成藏特征,认为位于秋里塔格构造带东段东秋6井东部的盐下背斜和冲起构造是油气勘探的有利部位.研究结果表明:秋里塔格构造带东段及周边地区盐上层发育有3种构造样式;盐下层发育有5种构造样式,盐上—盐下共发育有5种构造组合样式,他们具有典型的南北分带、东西分段和上下分层的分布特征,构造活动期为新生代库车组沉积期(约5.33 Ma)至今,与板块挤压、膏盐层分布和局部应力条件有关.东部盐上层主要发育单斜地层,西部和中部盐上层发育向斜构造和破裂背斜构造;中部膏盐层中发育的滑脱断层倾向与西部和东部不同,滑脱断层的倾向由最大主压应力轴倾斜方向决定;西部盐下层主要发育背斜构造,而中部和东部盐下层主要发育冲起构造.盐上—盐下构造组合随着膏盐层厚度减薄依次发育同向或反向不对称盐脊、对称盐槽、盐楔和协调变形构造.膏盐岩不仅具有良好的油气封盖性,还对盐下圈闭的完整性具有保护作用,同时,盐下背斜与冲起构造核部及翼部发育的裂缝有利于改善储层中油气运移聚集条件.秋里塔格构造带东段烃源岩—断裂—圈闭—盖层达到时空有效匹配,且东秋6井东部的盐下构造圈闭保存条件良好,可以形成大规模油气藏.In order to clarify the cenozoic salt-related structures and sub-salt favourable structural traps in the eastern part of the Qiulitage structural belt in the Kuqa foreland basin,This study integrates the techniques of seismic interpretation,balanced cross-section restoration,geomechanics and salt structure analysis.The structural characteristics of the eastern part of the Qiulitage structural belt and its surrounding areas are deeply analyzed,the tectonic activity period and deformation mechanism are analyzed,and the characteristics of oil and gas accumulation are summarized.It is considered that the subsalt anticline and pop-up structure located in the eastern part of Dongqiu 6 well in the eastern part of the Qiulitage structural belt are favorable parts for oil and gas exploration.The research results show that there are three structural styles developed in the suprasalt strata,five structural styles developed in the subsalt strata,and five structural combination styles developed in the suprasalt strata and subsalt strata in the eastern part of the Qiulitage structural belt and its surrounding areas.They have typical distribution characteristics of north-south zoning,east-west segmentation and upper and lower stratification,and the tectonic activity period is from the sedimentary period of the Cenozoic Kuqa formation(about 5.33 Ma)to the present,which are related to plate extrusion,gypsum salt layer distribution and local stress conditions.Monoclinal strata are mainly developed in the suprasalt strata in the east,synclinal structures and fractured anticlines are developed in the suprasalt strata in the west and middle.The dip direction of the detachment faults in the central part of the study area in the gypsum salt layer is different from that in the western and eastern parts,the dip direction of the detachment fault is determined by the inclination direction of the maximum principal compressive stress axis.The subsalt anticline is mainly developed in the western part of the study area,while the central and ea

关 键 词：秋里塔格构造带 盐相关构造 膏盐岩 滑脱断层 油气勘探 

分 类 号：P618.13[天文地球—矿床学]