摘要
塔河油田是目前国内发现的储量规模最大的海相碳酸盐岩古潜山油田,受构造抬升作用影响,长期遭受风化剥蚀和淋滤溶蚀作用,形成了复杂的古岩溶缝洞系统。塔河油田主体区进入精细挖潜阶段,面临高含水、注采井组失效增多、井距变小等开发矛盾,部署风险增加,开发难度加大,严重制约了油藏的井网构建和高效开发;因此,开展古岩溶缝洞系统表征研究至关重要。受可溶性岩、构造、地形地貌及水动力条件的共同控制,古岩溶缝洞系统具有平面上分区、纵向分带的特征。不同区带上,纵向古岩溶分带具有差异性。本文以塔河油田四区奥陶系古岩溶缝洞储层为研究对象,利用测井、钻井、录井、地球物理等技术手段,对古岩溶缝洞系统进行分类表征和描述。塔河油田四区平面上可划分为三类古岩溶区带:风化壳、断裂-暗河、风化壳-暗河,纵向上划分表层风化壳淋滤带、垂向渗滤溶蚀带、水平径流溶蚀带。不同的岩溶发育带测井、钻井响应特征及缝洞组合存在差异性,可利用地震多属性融合技术对古岩溶缝洞系统进行分类表征。本文构建了古岩溶缝洞系统划分方法,进而结合古岩溶水文地貌条件的恢复和古岩溶,将塔河四区划分为5个古岩溶缝洞系统和35个古岩溶单元。其研究思路及技术成果为油田开发井网的完善与剩余油描述奠定了研究基础。
The Tahe oilfield is currently the largest marine carbonate buried hill oilfield discovered in China.Affected by tectonic uplift,Tahe oilfield has suffered weathering and denudation,leaching dissolution for a long time,forming a complex paleokarst fracture-cave system.As the main area of the Tahe Oilfield enters the stage of fine tapping,it is faced with development conflicts such as high water content,increased failure of injection and recovery well groups,and smaller well spacing,which increases the deployment risk and development difficulty,and seriously restricts the construction of well network and efficient development of the oil reservoir.Therefore,it is crucial to carry out research on the characterization of paleokarst fracture-cave system.Controlled by soluble rock,structure,topography and hydrodynamic conditions,paleokarst fracture-cave system has the characteristics of plane zoning and longitudinal zoning.The vertical paleokarst zoning is different in different plane zones.By means of logging,drilling,and geophysical techniques,the paleokarst fracture-cave system is classified,characterized and described.The fourth zone of Tahe oilfield can be divided into three types of paleokarst zones:weathering crust,fracture-underground river and weathering crust-underground river.Vertically,the Tahe Oilfield can be divided into three zones:surface weathering crust,vertical percolation and horizontal runof f.There are differences in logging and drilling response characteristics and fracture-cave combinations indifferent karst development zones,and the seismic multi-attribute fusion technique can be used to classify and characterize the paleokarst fracture-cave systems.A method for classifying paleokarst fracture-cave systems is constructed.The fourth zone of Tahe oilfield is divided into 5 paleokarst fracture-cave systems and 35 paleokarst units.The research ideas and technical achievements have established the research foundation for the improvement of well pattern optimization and the description of remaining oil in oilfield.
作者
张娟
汪彦
刘遥
王震
王仕林
ZHANG Juan;WANG Yan;LIU Yao;WANG Zhen;WANG Shilin(Exploration and Production Research Institute,Northwest Oilfield Branch,SINOPEC,Urumqi,Xinjiang 830011,China)
出处
《现代地质》
北大核心
2025年第6期1571-1582,共12页
Geoscience
基金
中国石化重大科技项目(P23034)
新疆维吾尔自治区天山英才-优秀工程师培养项目。
关键词
古岩溶缝洞系统
潜山型
碳酸盐岩
塔里木盆地
paleokarst
fracture-cave system
buried hill type
carbonate rock
the Tarim Basin
