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.