杭锦旗地区十里加汗区带山1段致密砂岩气水分布影响因素及分布特征研究

杭锦旗地区十里加汗区带山1气藏产水普遍,对气水分布影响因素及分布特征认识不清,制约了气田勘探开发进程。利用钻井、测井、录井、分析化验、生产测试等资料进行综合研究,明确了气水影响因素及分布特征。研究表明:1山1段气水层按类型主要分为气层、"上气下水"型、"气水同层"型、水层,产出的地层水主要来自"上气下水"型和"气水同层"型,总结了各种气水层的测井特征;2分析了气水分异现象的原因:在物性较好的井区,临界气柱高度小,气水分异彻底,形成"上气下水"型;在物性较差的井区,临界气柱高度大,气水无法分异,形成"气水同层"型;3生烃强度控制了气水层的宏观分布,储层和物性进一步控制了气水层的展布范围和分布状态,正向微构造和鼻隆对气藏的富集起到了一定控制作用;4山1段气藏类型有岩性、构造+岩性复合、构造三类,前两类为研究区的主要气藏类型,是下一步的重点勘探对象。

Research on tight sandstone gas-water distribution influencing factors and distribution characteristics of the first member of Shanxi formation Shilijiahan zone in Hangjinqi area

Water production is common in Shan-1 gas reservoir of Shilijiahan zone in Hangjinqi area,but the understandings on influencing factors of gas-water distribution and its distribution characteristics are not clear,which restricts the gas field exploration and development process.Through comprehensive analysis of drilling,well logging,laboratory analysis,production test data,the influencing factors and the distribution characteristics have been made clear.Studies show that:1 gas-water layers types of Shan-1 member can be mainly divided into gas-layer,upper gas-lower water layer,gas-water layer and water layer,the produced formation water mainly comes from upper gas-lower water layer and water-gas layer,and the logging characteristics of each type have been summarized;2 the reasons of gas- water differentiation phenomenon have been analyzed:in well region with good physical properties,the boundary height of natural gas is low,gas and water can be completely differentiated,and form the upper gas-lower water type;in well region with poor physical properties,the boundary height of natural gas is high,gas and water can not be differentiated,and form gas-water type;3 the hydrocarbon generation intensity has the control on the macro-distribution of gaswater layers,the reservoirs and the reservoir physical property has further controlled the distribution range and status,the forward micro structure and nose-long enrichment gas reservoirs play a controlling role in hydrocarbon enrichment;4 there are 3 gas reservoir types in Shan-1 member,namely lithology type,structure+lithology type and structure type.The first two types are the main gas reservoir types,and the structure type is locally developed,therefore,the first two types are the key exploration targets in the next step.