塔河油田海西运动早期岩溶水系统划分及特征  

Division and Characteristics of Karst Water System in Early Hercynian Movement in Tahe Oilfield,Tarim Basin

作　　者：张长建[1,2] 杨德彬[1,2] 吕艳萍[1,2] 张娟[1,2] 李杰[1,2] 丁立明 ZHANG Changjian;YANG Debin;LYU Yanping;ZHANG Juan;LI Jie;DING Liming(Sinopec Northwest Oilfield Company,Research Institute of Exploration and Development,Urumqi,Xinjiang 830011,China;Sinopec Northwest Oilfield Company,Key Laboratory for Enhanced Oil Recovery of Fractured‑Vuggy Reservoirs,Urumqi,Xinjiang 830011,China)

机构地区：[1]中国石化西北油田分公司勘探开发研究院,乌鲁木齐830011 [2]中国石化西北油田分公司缝洞型油藏提高采收率重点实验室,乌鲁木齐830011

出　　处：《新疆石油地质》2023年第6期646-656,共11页Xinjiang Petroleum Geology

基　　金：中国石化科研重大项目(P20017)。

摘　　要：塔里木盆地塔河油田中—下奥陶统海西运动早期地表及地下岩溶形态多样,地下岩溶缝洞系统中油气资源丰富。根据高精度地震资料及钻井资料,统一地下及地表水系统,构建了塔河油田中—下奥陶统海西运动早期岩溶水系统。研究结果表明:塔河油田中—下奥陶统在海西运动早期发育4个岩溶台地,总体呈东高西低阶梯分布,岩溶水差异化排泄和溶蚀作用造成各岩溶台地发育峡谷、伏流、深切曲流、宽谷等不同水文地貌形态;岩溶水系统的边界主要为地表分水岭、排泄基准面、地层岩性组合、断裂和弱溶蚀带;塔河油田岩溶水系统划分为4个相对独立的二级岩溶水系统,分别为高原峡谷水系统、伏流峡谷水系统、深切曲流水系统和宽谷水系统;岩溶水系统层级结构的划分为深化塔河油田岩溶缝洞系统和岩溶缝洞单元认识提供地质依据。In the Tahe oilfield of the Tarim basin,the Middle-Lower Ordovician surface and subsurface karsts were diverse morphologically in the early Hercynian.There are abundant oil and gas resources in subsurface karst fracture‑vug systems.Based on high‑precision seismic data and drilling data,and by unifying the subsurface and surface water systems,the Middle-Lower Ordovician karst water system in the early Hercynian movement in the Tahe oilfield was constructed.The research results show that,in the early stage of the Hercynian movement in the Tahe oilfield,there developed four karst platforms in the Middle-Lower Ordovician,generally distributed in a step‑like pattern with higher elevation in the east than in the west.The differential drainage and dissolution of karst water resulted in various hydromorphology,such as canyon,underground river,incised meandering river,and wide valley.The karst water system are mainly bounded by surface watershed,drainage baseline,stratigraphic lithology assemblage,fault,and weak dissolution zone.The karst water system in the Tahe oilfield can be divided into four relatively independent secondary karst water systems:plateau canyon water system,underground river canyon water system,incised meandering river water system,and wide valley water system.This classification of the hierarchical structure of the karst water system provides a geological basis for further understanding the karst fracture‑vug system and karst fracture‑vug unit in the Tahe oilfield.

关 键 词：塔里木盆地 塔河油田 海西运动早期 奥陶系 岩溶缝洞 岩溶水系统 地貌形态 

分 类 号：TE122.2[石油与天然气工程—油气勘探]