塔河油田层控岩溶型储集体发育特征及典型岩溶模式探讨  

Reservoir development characteristics and karst models for the“strata bound”karst reservoirs in the Tahe Oilfield

作　　者：金燕林[1,2] 张慧涛[1,2] 刘遥[1,2] 吉玉雯 JIN Yanlin;ZHANG Huitao;LIU Yao;JI Yuwen(Exploration and Development Research Institute,Northwest Oilfield Company,SINOPEC,rümqi 830011,China;Key Laboratory of Enhanced Oil Recovery for Fractured Vuggy Reservoirs,SINOPEC,Urmqi 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,新疆乌鲁木齐830011 [2]中国石化缝洞型油藏提高采收率重点实验室,新疆乌鲁木齐830011

出　　处：《地学前缘》2023年第6期125-134,共10页Earth Science Frontiers

基　　金：国家自然科学基金项目“海相深层油气富集机理与关键工程技术基础研究(U19B6003)”;中石化科研项目“基于深埋改造的塔河油藏缝洞结构研究(P23034)”。

摘　　要：塔河油田开发实践揭示储集体空间连通程度决定了油井产能。识别、描述顺层岩溶储集体的发育特征,阐述该类岩溶垂向分带性和岩溶机制对于塔河全区油气勘探开发意义重大。本文基于野外露头、岩心/岩石薄片、钻/测井和三维地震等资料,以岩溶水循环理论为指导,结合地震属性提取技术,初步将塔河地区层控岩溶定义为受有利相带、初始层、次级界面和层内断裂等几个因素单独或者联合控制,形成了一套呈层状展布且岩性、物性以及油气生产等方面均有别于上下地层的储集体的一种溶蚀作用。明确了层序界面、断裂和沉积环境共同作用控制了层控岩溶型储集体的发育,并总结了岩溶峡谷区向斜汇流型和局部宽缓平台区单支水系渗流型两种岩溶模式。这两类模式体现了塔河油田不同构造背景、水系条件和断裂规模等储层控制因素的差异性,对于合理辨析层控岩溶在储层形成过程中所发挥的作用至关重要。The oil well productivity in the Tahe Oilfield is determined primarily by the reservoir connectivity.For the oil and gas exploration and development in the greater Tahe area,it is important to clarify the reservoir development characteristics of bedding karst reservoirs and the underlying vertical zoning patterns and karst formation mechanisms.Based on the outcrop,core/rock thin section,drilling,logging and 3D seismic data and the characteristics of water cycling in karst aquifers,combined with seismic attribute analysis,the“strata bound”karst system in the Tahe area is preliminarily defined as a dissolution karst system that is controlled,independently or jointly,by factors such as favorable facies belt,primary layer,secondary interface and intra-formational fault.The karst system develops a set of layered reservoirs that are different from the upper and lower strata in lithology,physical property and oil and gas production.It is clarified that the sequence boundary,fault and sedimentary environment jointly control the development of the“strata bound”karst reservoirs.Two karst models are summarized:synclinal-confluence type in karst canyon areas,and single-branch seepage type in localized wide,gentle platform areas.These two karst models reflect the differences in reservoir control factors including structural background,water system conditions and fracture scales in the Tahe Oilfield,which are key to determining the role of“strata bound”karst in the formation of karst reservoirs.

关 键 词：奥陶系 上奥陶统 岩溶模式 顺层岩溶 塔河油田 

分 类 号：TE122[石油与天然气工程—油气勘探]