塔河地区海西早期岩溶斜坡上分水岭的组成及其缝洞结构  

Composition and fracture-cave structure of watershed on the early Hercynian karst slope in Tahe area,Tarim Basin

作　　者：张三 金强[1] 田雯 程付启[1] 张旭栋 魏荷花[3] 卜翠萍[3] ZHANG San;JIN Qiang;TIAN Wen;CHENG Fuqi;ZHANG Xudong;WEI Hehua;BU Cuiping(School of Geosciences in China University of Petroleum(East China), Qingdao 266580, China;Exploration and Development Research Institute, Shengli Oilfield Company, SINOPEC, Dongying 257022, China;Exploration and Development Institute of SINOPEC, Beijing 100083, China)

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]中国石油化工股份有限公司胜利油田分公司勘探开发研究院,山东东营257022 [3]中国石油化工集团公司勘探开发研究院,北京100083

出　　处：《中国石油大学学报（自然科学版）》2021年第3期12-22,共11页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金-中国石化联合基金项目(U1663204);国家油气重大专项(2016ZX05014-002-007)。

摘　　要：将岩溶地质学与地质地球物理资料相结合,对塔河地区奥陶系碳酸盐岩岩溶斜坡分水岭的组成和缝洞结构进行解剖。在岩溶水系划分的基础上,重点分析S48和S74分水岭的结构组成和缝洞发育特征,剖析出断块石林、断槽溶谷和断坡溶丘3个组成部分。结果表明岩溶期走滑挤压背景下发育的正花状构造(地貌高带)起着分水岭作用,将塔北岩溶斜坡划分成多个岩溶流域;断块石林受断层推举处于分水岭高部位(奥陶系与巴楚组突变接触),其中裂缝和缝洞复合体发育,岩溶储层可达116 m;断槽溶谷为断层切割低部位,除裂缝/缝洞复合体发育外,奥陶系内发育4类驻水洞、槽谷内发育巨型角砾遮挡洞穴以及岩溶期堆积物,岩溶储层厚度可达136 m;断坡溶丘位于分水岭翼部,裂缝和缝洞复合体组成的岩溶储层厚度一般小于50 m。断块石林和断槽溶谷油气富集,62%的油井单井累积产油量超过20×10^(4) t,而断坡溶丘76%的油井单井累积产油量小于10×10^(4) t。By on drilling and seismic information as well as karst geology,the formation and evolution of watershed were investigated on Tabei Ordovician karst slope,and its karst reservoirs were also studied with an example in the Tahe Oilfield.The watershed was composed of faulted rock-blocks,fault-troughs,residual mounds by focusing on analysis of the formation of S48 and S74 watershed based on the division of karst drainage.The results show that a series of positive flowers structures were formed by the strike slip-extrusion stress in the karst stage as watershed,which divided the karst slope into several karst drainage system.The faulted rock-blocks was elevated by fault thrust,so that the Ordovician was in direct contact with the Bachu formation,in which the fractures and fracture-vugs complex were densely developed and the karst reservoir could reach 116 m.The faulted troughs was the lower part of fault cutting,in addition to fractures and fracture-cave complexes,which contains 4 types of water storage caves and shelter caves formed by the giant collapsed breccias and karst debris flow sediments,the karst reservoir thickness up to 136 m.The residual mounds was located at the wing of the watershed,and the fracture-caves reservoir thickness generally less than 60 m.The faulted troughs and faulted rock-blocks were important oil and gas accumulation area in the watershed,where cumulative oil production per well more than 20×10^(4) t account for 62%,and the single well cumulative oil production of 76%wells on the fault ramp monadnock were around 10×10^(4) t.

关 键 词：岩溶斜坡 分水岭 断槽溶谷 断块石林 断坡溶丘 奥陶系 塔河油田 

分 类 号：TE122.1[石油与天然气工程—油气勘探]