塔河油田碳酸盐岩小缝洞型储层特征及成因演化

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...

Characteristics and genetic evolution of small-scale fracturecavity carbonate reservoirs in Tahe Oilfield

Small-scale fracture-cavity carbonate reservoirs in Tahe Oilfield have great exploration and development poten?tial,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 frac?ture-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(includ?ing 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 in?terpretation 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 collaps?es of various scales and residual karst channels between caves are mainly formed in the topographic old age.