塔里木盆地库车坳陷秋里塔格构造带中秋—东秋段盐相关构造特征及变形机理  

Salt-related structural characteristics and deformation mechanism of the Zhongqiu-Dongqiu section of the Qiulitag structural belt,Tarim Basin

作　　者：段云江[1] 罗浩渝[1] 谢会文[1] 徐振平[1] 章学岐 张敬洲[1] 石磊[1] 袁瑞[1] Yun-jiang DUAN;Hao-yu LUO;Hui-wen XIE;Zhen-ping XU;Xue-qi ZHANG;Jing-zhou ZHANG;Lei SHI;Rui YUAN(Research Institute of Tarim Oilfield Company,PetroChina,Korla 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：《天然气地球科学》2021年第7期993-1008,共16页Natural Gas Geoscience

基　　金：国家重点研发计划“塔里木盆地盐下超深层油气分布规律及有利勘探区带评价”(编号:2019YFC0605505)资助

摘　　要：塔里木盆地秋里塔格构造带中秋—东秋段新近系、古近系中广泛发育着厚层膏盐岩,但由于膏盐层分布的差异性造成了中秋、东秋盐下层和盐上层分别具有不同的构造样式和变形机理。在二维、三维地震资料解释的基础上,以前陆盆地系统体系为理论基础,开展中秋—东秋段构造样式的精细分析。通过地震精细解释、已钻井和膏盐层分布的综合分析,认为中秋段处于库姆格列木群膏盐岩和吉迪克组膏盐岩交会叠置区,盐下发育滑脱逆冲叠瓦构造,盐上发育反冲构造;东秋段发育吉迪克组膏盐岩,盐下发育大型宽缓背斜,盐上层发育滑脱逆冲构造,形成单斜或断背斜构造。采用离散元数值模拟手段,利用单因素变量方法,通过4组对比模拟实验,探讨中秋、东秋盐构造变形机理。离散元数值模拟结果表明:盐岩展布形态、同构造沉积、基底先存断裂等因素,是中秋—东秋段盐构造变形的控制因素。盐层的展布、叠置关系显著影响盐下构造变形,盐层发育区形成多排逆冲断裂,盐层不发育区构造整体抬升,逆冲断裂断穿上部岩层;同构造沉积减弱了盐下构造变形强度,对构造形态有一定影响;先存断裂主要影响盐下构造样式及挤压端垂向隆升幅度。Thick layers of gypsum rocks are widely developed in the Neogene and Paleogene of the Zhongqiu-Dongqiu section of the Qiulitag structural belt,Tarim Basin.However,due to the differences in the distribution of the salts,there are different structural styles and deformation mechanisms in the lower salt layer and upper salt layer of the Zhongqiu and Dongqiu,respectively.Based on the interpretation of 2D and 3D seismic data and the theoretical basis of the former continental basin system,a detailed analysis of the structural style of the Zhongqiu-Dongqiu section was carried out.Through detailed seismic interpretation,well-drilling,distribution of gypsum layer analysis,it is considered that the Zhongqiu section is located in the intersection and superposition area of the gypsum salt rock of Qomglemu Group and the gypsum salt rock of the Jidike Formation,with slippage and thrust imbricated structure developed under salt and recoil structure developed above salt.In the Dongqiu,the gypsum salt rock of the Jidike Formation is developed,and the large wide and slow anticline is developed under salt,and the slippage and thrust structure are developed in the upper salt layer,forming monocline or fault anticline.By means of discrete element numerical simulation and single factor variable method,through four groups of comparative simulation experiments,the mechanism of salt tectonic deformations in Zhongqiu and Dongqiu were discussed.Discrete element numerical simulation results show that the distribution of salt rock,syntectonic deposition and basement preexisting fault are the controlling factors of salt tectonic deformation in the Zhongqiu-Dongqiu Period.The distribution and superposition of salt layer significantly affect the tectonic deformation under salt layer.Multiple rows of thrust faults are formed in the developed area of salt layer.Syntectonic deposition weakens the tectonic deformation intensity under salt and has certain influence on the tectonic morphology.Preexisting faults mainly affect the tectonic style under

关 键 词：秋里塔格构造带 中秋—东秋段 盐构造 构造变形特征 变形机理 离散元模拟 

分 类 号：TE122.1[石油与天然气工程—油气勘探]