摘要
塔河油田奥陶系碳酸盐岩油藏为受控于构造—岩溶旋回作用形成的缝洞系统,是由多个缝洞单元在空间上叠合形成的复合油气藏。储集体的基本单元为缝洞单元,单个缝洞单元为一个相对独立的油气藏。塔河油田奥陶系缝洞单元地层水按其赋存状态可以分为3种类型:洞穴底部油气驱替残留水;洞穴周缘小缝洞系统驱替残留水;储层下部层间水。缝洞单元水化学性质与洞穴间联系程度有关。连通性好的缝洞单元内的井具有相似的地下水化学性质;连通性差或不连通的缝洞单元,地下水化学性质则存在一定差异。以塔河油田奥陶系油藏主要缝洞单元S48井缝洞单元为例,分析了缝洞单元地下水化学性质及开发动态,为油田的开发及稳油控水提供依据。
Ordovician carbonate reservoir in Tahe Oilfield is a composite reservoir superimposed by several fracture-cave units and controlled by tectonic-karst cycle. As a basic unit of reservoir, a fracture-cave unit is a relatively independent reservoir. According to the state of water occurrence, formation water can be divided into three types including residual water at the bottom of cave after oil and gas displacement, residual water in fracture and crevice around cave after oil and gas displacement and interlayer water under res-ervoirs. Hydro-chemical characteristics of fracture-cave unit are related to the connection of caves. Oil wells in fracture-cave unit with good connectivity have similar hydro-chemical characteristics, and oil wells in fracture-cave unit with poor connectivity have different hydro-chemical characteristics. The hydro-chemical characteristics and corresponding development performance of the Ordovi.This study can provide some data for production and development of Tahe Oilfield.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2008年第4期567-572,共6页
Acta Petrolei Sinica
基金
国家重点基础研究发展规划(973)项目(2005CB422107)“中国海相地下水水文地球化学与油气保存条件研究”部分成果
关键词
塔河油田
奥陶系油藏
缝洞单元
洞穴系统
水化学性质
开发动态
Tahe Oilfield
Ordovician reservoir
fracture-cave unit
cave system
hydro-chemical characteristics
development per-formance