摘要
对地层水发育、分布和化学特征的认识,是致密砂岩气藏高效开发、建立防早期水窜方案的基础之一。采用大量岩心观察、常规离子浓度测试、生烃条件和试气分析,研究苏里格气田西南部地层水化学特征、存在形态、分布特征,明确区内气水分布规律和控制因素,探讨地层水对天然气成藏的影响。结果表明:①区内地层水以残余水和变质古沉积水为主,具典型低钠氯系数、低镁钙系数特征,有利于天然气聚集成藏和保存;②按赋存状态可将地层水分为气藏边底水、层间致密带束缚水、孤立地层水3种;③地层水多与天然气共存,气水关系复杂,没有统一气水界面,纯气层较少,多为含气水层、气水同层;④河道砂体中部多为气层、差气层,河道边部、底部、河口坝多为水层、气水同层。总结认为:①气水分布受多种因素影响,其中生烃强度、砂体展布从根本上控制了气水分布格局,非均质性影响水体运移,导致产水井在平面分布上差异较大。②开发目标应集中于河道砂体物性较好的构造高部位,避开易产水的河道边部、底部以及河口坝。
The research on formation water development,distribution and chemical characteristics is one of the bases for tight sandstone gas reservoir efficient development and the early water channeling scheme establishment.We use large amounts of core observation,routine ion concentration test,hydrocarbon generation conditions and gas-test data to investigatethe chemical characteristics,existing forms and distribution characteristics of formation water in southwest Sulige Gas Field,then identify the distribution rules and controlling factors of gas and water in the area,finally discuss the significance of formation water to natural gas accumulation.The following results were obtained.First,the formation water is mainly irreducible water and metamorphoses ancient connate water,with a typical low sodium-chloride ratio and low magnesium-calcium ratio,whichis conducive to gas accumulation and preservation.Second,based on its location,the formation water can be classified into gas reservoir edge-bottom water,dense zone bind water and isolated water.Third,the formation water and gas reserved together by complex relationship with no unified gas water interface.The pure gas zones are rare,and they are mostly gas-water zone and gas-bearing water zone.Fourth,the gas layer and differential gas layer most developed in the central channel sand body,while the water layer and gas-water layer in the edge and bottom channel sand and bar sand.It＇s concluded that the gas and water distribution can be influenced by some factors,i.e.,hydrocarbon generating intensity and sandbody distribution radically control the gas and water distribution,heterogeneity can affect the movement of formationwater and cause a big different distribution of water production wells.The favorable gas reservoirs are concentrated in the high structural parts with good physical properties and can be favorable section for gas wells and the edge and bottom of distributary channel and mouth bar should be avoided.
作者
崔明明
王宗秀
樊爱萍
高万里
Cui Ming-ming;Wang Zong-xiu;Fan Ai-ping;Gao Wan-li(Key Laboratory of Shale oil and Gas Survey,Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China;College of Geological Science ＆ Engineering,Shandong University of Science and Technology,Qingdao 266590,China)
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2018年第9期1364-1375,共12页
Natural Gas Geoscience
基金
中国地质调查项目(编号:DD20160173
DD20189614)
国家自然科学基金项目(编号:41702204)联合资助
关键词
地层水
矿化度
水型
气水分布
生烃强度
苏里格气田
Formation water
Salinity
Water type
Gas and water distribution
Hydrocarbon generating intensity
Sulige Gas Field
