摘要
巴喀油田中侏罗统砂岩产层,基质岩块平均渗透率为03×10-3μm2,发育有四种裂缝类型。地面调查和岩芯统计分析等表明:该油田砂岩裂缝与灰岩裂缝相比,具有规模小、充填剧烈、低渗透等特点;裂缝分布主要受岩性、层厚、地应力等影响;产层中裂缝是主要渗透通道,储集类型为裂缝孔隙型;基质岩块形态取决于裂缝类型及组合,尺寸取决于裂缝频率。最后提出了储层裂缝分布网络的概念模型。
The producing mid-Jurassic sandstones in the Baka oilfield have an average matrix permeability of 0.3×10-3μm2.Within these sandstones four kinds of fractures have been recognized. With fractures providing the major passage for fluid flow, these sandstone reservoirs fall into the fractured-porous category. Field survey and statistical data from core measurements indicate that the distribution of fractures is principally controlled by lithology, bed thickness and stress conditions, the geometry of matrix blocks is a function of fracture type and the combination of fracture types, and the size of matrix blocks is controlled by the frequency of fractures. The conceptual model of fracture distribution is proposed.
出处
《西南石油学院学报》
CSCD
1998年第1期6-10,共5页
Journal of Southwest Petroleum Institute
关键词
盆地
油田
中侏罗统
裂缝
低渗透砂岩储层
Middle jurassic series
distribution
Network
Fractures
Sandstone
Baka oilfield
TurpanHami basin