摘要
川中地区须家河组是四川盆地致密砂岩气藏储量的主要集中区,而气水分布规律复杂则是造成该区各致密砂岩气藏气井出水严重、产量递减迅速的重要原因。该区致密砂岩气藏的气水分布在剖面上和平面上总体表现为气水过渡带特征,气、水层交互分布。综合气水分布特征、地质背景及生产动态,总结出3种符合该区致密砂岩气藏气水分布的模式:构造带气水分布模式、低渗带气水分布模式及裂缝带气水分布模式,并从气源岩、局部构造、致密砂岩储层及储层裂缝4个方面分析了控制该区致密砂岩气藏气水分布的因素:气源岩充注不足形成了该区气水过渡带的整体特征;局部构造的闭合度控制了气水的分异程度;致密砂岩储层提高了气水的排替难度;储层裂缝提供了气水的渗流通道。
The Xujiahe Formation in the Central Sichuan Basin is the main concentration area for tight sandstone gas reservoirs in the Sichuan Basin.However,complication of gas and water distribution patterns in this area is an important reason for serious water production and rapid production decline.In planar and vertical profiles,the gas and water distribution of tight sandstone gas reservoirs in this area has been characterized as a gas-water transition zone and interaction between gas-pay and water-pay.Integrating gas and water distribution characteristics,geological background and production performance,three gas and water distribution models corresponding to tight sandstone gas reservoirs in this area have been summarized as structural belt model,low permeable belt model and fracture belt model.Controlling factors on gas and water distribution of tight sandstone gas reservoirs in this area have been analyzed from four aspects including source rocks,local structures,tight sandstone reservoir and reservoir fractures.Insufficiency of source rocks formed the general characteristics of the gas and water transition zone in this area;local structure closure controlled the differentiation of gas and water;tight sandstone reservoir raised difficulty of drainage between gas and water;reservoir fractures supplied channels for flowing of gas and water.
出处
《地质科技情报》
CAS
CSCD
北大核心
2014年第4期66-71,共6页
Geological Science and Technology Information
基金
国家科技重大专项课题(2011ZX5015-005)
关键词
川中地区
须家河组
致密砂岩气藏
气水分布规律
Central Sichuan Basin
Xujiahe Formation
tight sandstone gas reservoirs
gas and water distribution regularity
