塔西南地区古隆起迁移及对造山作用和储集层发育的启示  

Migration of paleo-uplift in southwestern Tarim Basin and its implications for orogenesis and reservoir development,NW China

作　　者：严佳凯 陈汉林[1,2] 程晓敢[1,2] 陈永权[3] 曾昌民[3] 陈才[3] 吴鸿翔 YAN Jiakai;CHEN Hanlin;CHENG Xiaogan;CHEN Yongquan;ZENG Changmin;CHEN Cai;WU Hongxiang(School of Earth Sciences,Zhejiang University,Hangzhou 310058,China;Research Center for Structures in Oil and Gas Bearing Basins,Ministry of Education,Hangzhou 310058,China;Exploration and Development Research Institute of PetroChina Tarim Oilfield Company,Korla 841000,China)

机构地区：[1]浙江大学地球科学学院,杭州310058 [2]教育部含油气盆地构造研究中心,杭州310058 [3]中国石油塔里木油田公司勘探开发研究院,新疆库尔勒841000

出　　处：《石油勘探与开发》2023年第1期89-99,共11页Petroleum Exploration and Development

基　　金：国家科技重大专项课题“含油气盆地深层构造及其控油气作用”(2017ZX005-008-01);塔里木油田公司项目“西南坳陷古隆起构造演化及沉积盆地分析”(041014120098)。

摘　　要：在钻井层位标定的基础上,系统解释塔里木盆地西南部(简称塔西南)典型地震剖面,建立区域性的地质格架剖面,进而恢复各构造时期的剥蚀厚度,并编制寒武系盐下白云岩各时期古构造平面形态图,以分析早古生代晚期古隆起的空间展布、形成演化以及迁移规律。研究表明:早古生代晚期,塔里木盆地存在1个广布塔西南地区、统一的区域性古隆起,称之为塔里木西南部古隆起。前人所提出的“塔西南古隆起”和“和田古隆起”不是两个独立的古隆起,而是本次所识别出古隆起的时空迁移演化的结果。该古隆起始于中奥陶世末;晚奥陶世古隆起初具规模、幅度增大;志留纪时期古隆起稳定隆升,隆起范围快速向东部扩大,皮山—和田等区域成为古隆起的一部分,其构造高部位迁移到皮山—和田地区;泥盆纪古隆起开始逐渐缩小,范围仅限于塔里木盆地南部的皮山—和田一带;石炭纪古隆起成为水下隆起,古隆起逐渐消亡。塔里木盆地西南部古隆起属于早古生代晚期塔西南前陆盆地的前缘隆起,其形成演化与塔里木盆地南部西昆仑早古生代造山作用有关。塔里木盆地西南部古隆起从塔西南的西北部迁移到南部的皮山—和田一带,表明西昆仑早古生代造山作用从中奥陶世末开始于西段,呈“剪刀式”自西向东发展。古隆起的迁移演化控制了塔西南地区中奥陶世末、晚奥陶世末和中泥盆世末3期不整合的发育和不整合之下风化壳溶蚀缝洞储集层的空间分布,而古隆起构造高部位的迁移对风化壳溶蚀缝洞储集层的发育也具有重要的控制作用。Based on well horizon calibration, the typical seismic profiles in southwestern Tarim Basin were interpreted systematically,regional geological sections were established, and the regional denudation thickness of each tectonic period was restored. On this basis,the plane morphology maps of ancient structures of the Cambrian pre-salt dolomites in different periods were compiled, and the spatial distribution, development, evolution and migration of paleo-uplift in the late Early Paleozoic were analyzed. In the late Early Paleozoic,there existed a unified regional paleo-uplift widely distributed in southwestern Tarim Basin, which is called the southwestern Tarim plaeo-uplift. The “Tarim SW paleo-uplift” and “Hotan paleo-uplift” proposed in previous literatures are not independent, but the result of the spatio-temporal migration and evolution of the southwestern Tarim paleo-uplift identified in this paper. The southwestern Tarim paleo-uplift emerged at the end of Middle Ordovician, and took its initial shape with increased amplitude in the Late Ordovician. During the Silurian, the southwestern Tarim paleo-uplift rose steadily and expanded rapidly to the east, incorporating Pishan-Hotan and other areas, with the structural high locating in the Pishan-Hotan area. During the Devonian, the southwestern Tarim paleo-uplift began to shrink gradually, to a limited range in the Pishan-Hotan area in the southern part of the basin. During the Carboniferous, the southwestern Tarim paleo-uplift became an underwater uplift, that is, the paleo-uplift gradually died out. The southwestern Tarim paleo-uplift belongs to the forebulge of the southwestern Tarim foreland basin in the late Early Paleozoic, and its formation and evolution are related to the early Paleozoic orogeny of the West Kunlun orogenic belt in the south of the Tarim Basin. The migration of the southwestern Tarim paleo-uplift from the northwestern part of the southwestern Tarim Basin to the Pishan-Hotan area indicates the early Paleozoic orogenic process of the

关 键 词：古隆起 剥蚀 古构造平面形态 时空迁移 早古生代造山作用 塔西南 塔里木盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探]