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塔河油田碳酸盐岩小缝洞型储层特征及成因演化
杨德彬,杨敏,李新华,张娟,汪彦,王明
0
(1.中国地质大学(北京)能源学院,北京100083;2.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)
摘要:
塔河油田碳酸盐岩小缝洞具有巨大的勘探开发潜力,但前期相关资料及研究较少。为给本类型碳酸盐岩缝洞勘探开发提供借鉴,从小缝洞概念着手,通过对成像资料及岩心特征进行归纳分析,认为小缝洞型储层分为裂缝型、孔洞型(含小型溶洞)、裂缝-孔洞型(含洞间溶道)3大类。通过对“杂乱弱””和“弱小串珠”2类反射特征进行井震综合标定,认为单井测井解释虽以单个体积小的小缝洞为主,但小缝洞数量多,形成了一个相互连通的小缝洞群,整体规模大。结合塔河油田碳酸盐岩缝洞系统特征及成因演化过程,将小缝洞演化过程划分为幼年期、青年期、壮年期和老年期。其中,裂缝、裂缝伴生孔洞主要形成于幼年期;溶洞间的溶道及小型溶洞主要形成于青年期和壮年期。各种规模溶洞垮塌体残留的小型溶洞、残余洞间溶道主要形成于老年期。
关键词:  小缝洞  储层特征  成因演化  碳酸盐岩  塔河油田
DOI:10.13673/j.cnki.cn37-1359/te.2021.01.005
基金项目:
Characteristics and genetic evolution of small-scale fracturecavity carbonate reservoirs in Tahe Oilfield
YANG Debin,YANG Min,LI Xinhua,ZHANG Juan,WANG Yan,WANG Ming
(1.School of Energy Resources,China University of Geosciences(Beijing),Beijing City,100083,China;2.Exploration and Development Research Institute of Northwest Oilfield Company,SINOPEC,Urumqi,Xinjiang,830011,China)
Abstract:
Small-scale fracture-cavity carbonate reservoirs in Tahe Oilfield have great exploration and development potential,but there are few related data and poor research in the early stage. In order to provide a reference for the exploration and development of this type of fracture-cavity carbonate reservoirs,this paper begins with the concept of small-scale fracture-cave and analyzes imaging data and core characteristics. It is considered that small-scale fracture-cavity reservoirs can be divided into three types:fractured type,vuggy type(including small-scale caves)and fractured-vuggy type(including karst channels between caves). The comprehensive well seismic calibration of two kinds of reflection characteristics of “disorderly weak”and“weak small string beads”is conducted,and it is considered that although the single well logging interpretation mainly focuses on a single small-scale fracture-cave,there are a large number of small-scale fracture-caves,forming a group of interconnected small-scale fracture-caves,and the overall scale is large. Based on the fracture-cavity system characteristics and genetic evolution process of carbonate reservoirs in Tahe Oilfield,the evolution process of smallscale fracture-caves is divided into topographic infancy,adolescence,maturity and topographic old age. Among them,the fractures and the vugs associated with fractures are mainly formed in the topographic infancy stage. The karst channels and small-scale caves are mainly formed in the adolescence and maturity aged. The small-scale residual caves of cave collapses of various scales and residual karst channels between caves are mainly formed in the topographic old age.
Key words:  small-scale fracture-cave  reservoir characteristics  genetic evolution  carbonate rock  Tahe Oilfield

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