秋里塔格构造带盐下构造层变形特征及油气勘探潜力  

Structural Deformation and Petroleum Exploration Potential of Subsalt Layer in Qiulitage Structural Belt,Kuqa Depression

作　　者：谢会文[1] 罗浩渝[1] 章学岐 段云江[1] 张文[1] 谢亚妮[1] XIE Huiwen;LUO Haoyu;ZHANG Xueqi;DUAN Yunjiang;ZHANG Wen;XIE Yani(Research Institute of Exploration and Development,Tarim Oilfield Company,PetroChina,Korla,Xinjiang 841000,China)

机构地区：[1]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：《新疆石油地质》2020年第4期388-393,共6页Xinjiang Petroleum Geology

基　　金：国家科技重大专项(2016ZX05003-004);中国石油科技重大专项(2018E-1801)。

摘　　要：秋里塔格构造带位于库车坳陷中部,受南天山造山作用的影响,发育一系列冲断构造,具明显的分层变形特征。依据地面露头和地震资料,秋里塔格构造带以古近系库姆格列木群及新近系吉迪克组膏盐岩为中心,可划分为盐上构造层、膏盐岩构造层和盐下构造层;受挤压作用,膏盐岩差异流动,在地表形成多排线性褶皱带,盐上构造层则发育逆冲推覆及反冲构造,而盐下构造层的变形特征主要受控于挤压应力和古生代古隆起,具有明显的分段性。中秋—东秋段位于新和—牙哈古隆起北坡,盐下构造层发育与克深构造带相似的冲断构造,可形成幅度高、规模较大的断背斜圈闭,油气勘探潜力大;佳木—西秋段位于温宿和西秋古生代古隆起之上,盐下构造层不发育冲断构造,盐下圈闭以低幅度断背斜和断块为主,规模不大,勘探潜力相对较小。Qiulitage structural belt is located on the central part of Kuqa depression.Influenced by the orogenesis of the southern Tianshan Mountain,a series of thrust structures are developed in Qiulitage structural belt which has significant layered deformation characteristics.Based on the data of field survey and seismic interpretation,and taking the Paleogene Kumugeliemu group and the Neogene Jidike formation in Qiulitage structural belt as the main objectives,the Qiulitage structural belt is classified into above-salt layer,salt layer and subsalt layer.Due to the compression,the differential flow deformation of the gypsum-salt rock resulted in the forming of rows of linear folded belts on the surface,thrust nappe structures and recoil structures are developed in the above-salt layers,and the deformation of subsalt layer is mainly controlled by compressional stress and Paleozoic paleo-uplift,showing an obvious segmentation feature.In the central and eastern parts of Qiulitage structural belt which are located on the northern slope of Xinhe—Yaha paleo-uplift,the thrust structures similar to Keshen structural belt are developed in the subsalt layers where large-scale high-amplitude faulted anticline traps formed with great petroleum exploration potential.In the Jiamu—Xiqiu segment which is located on the Wensu-Xiqiu Paleozoic paleo-uplift,thrust structures cannot be found in the subsalt layer,and the subsalt traps are dominated by low-amplitude faulted anticline and faulted block,showing relatively small exploration potential.

关 键 词：塔里木盆地 库车坳陷 秋里塔格构造带 冲断构造 膏盐岩 构造分层 盐下构造层 油气勘探潜力 

分 类 号：TE122.32[石油与天然气工程—油气勘探]