苏里格气田盒8段气水分布及其控制因素

GAS-WATER DISTRIBUTION AND ITS CONTROL FACTORS OF HE 8 MEMBER IN SULIGE GASFIELD

苏里格气田石盒子组盒8段是气田的主力产层,其地层水矿化度一般在20g/L～50g/L,水型为CaCl2型。通过66口井的试气资料及地层水化验数据的分析,盒8段气层或水层除了呈相互独立的分布外,同一层段的砂体中还具有气层/水层、气水互层和气水同层三种分布类型。在平面上,气水分布关系复杂,地层水主要分布在苏里格庙西北的苏9井—鄂6井一带和乌审旗东北的盟4井—统18—统6井一带。通过苏里格地区盒8段构造、岩性以及储集物性等综合分析,认为盒8段气水分布主要受沉积微相、储层物性以及气体充注强度的控制。

He 8 Member of Shihezi Formation is the main production layer in Sulige gasfield.The formation-water salinity is 20g/L～50g/L,and water type is CaCl2.Through a data analysis of gas-testing and formation water from 66 wells,it is found that there exists the independent distribution of gas or water layer in this member.And besides,there are 3 types of distribution including gas/water layer,interbedded gas/water layer and same gas/water layer in sandbody of one interval.On the plane,gas-water distribution is complicated.Formation water mainly distributes in Shu 9 well-E 6 well,northwestern Shuligemiao and Meng 4 well-Tong 18 well-Tong 6 well of northeastern Wushenqi.According to a comprehensive analysis of structure,lithology and reservoir property of He 8 Member,this study concludes that the gas-water distribution is controlled by sedimentary micro-facies,reservoir property and gas-filled strength.