A Study On Distirbution Of Residual Gas Of Shan 62 And Shan 66 Wellblocks In Jingbian Gas-field

The Ma51+2 carbonate rock of The Majiagou formation in Shan 62 and Shan 66 wellblocks located Jingbian field is low porosity and low permeability carbonate reservoir.Because of strong heterogeneity and poor reservoir properties,the local area in gas field developed more than 10 years still exists lots of undeveloped reserves.Firstly,this paper completed the research about reservoir characteristics that is the basis of analyzing the distribution of the remaining reserves.The research carry on geology,well logging,well testing,production and other informations,described the Ma51+2 carbonate reservoir elaboratly in facies,rock type,reservoir properties,pore structure and so on.On the basis of reservoir characteristics,used a variety of methods to calculate the static and dynamic gas reserves accurately.Then,established the categorization criteria to classifly reserves to three grades-high quality grade(Ⅰ),common grade(Ⅱ),hard producing grade(Ⅲ)and complie distribution diagram of the three reserves every zones.Then,Make full use of well logs to set up the Ma51+2 carbonate reservoir three-dimensional geological modeling about structure,facie and property.On the basis of geological modeling and reserve calculation,accorded to the gas reservoir geological datas and production datas,elaborately numerical simlute the 6 zones by using 3D gas-water two phases black-oil model.The matching ratio of wells reach a high level.The distribution of the reserves of residual gas is described by gas saturation and formation pressure in the gas reservoir.The research conclusion is that the distribution of the reserves of residual gas is determined by 7 factors that is facies,interlayer and inlayer heterogeneity,grooves,well pattern,produced-water,low pressure.But for Shan 62 well block producing more gas and Shan66 well block producing less gas,the impact of these seven factors are different.The reserves of residual gas of high-yield Shan 62 is impacted by inlayer heterogeneity,grooves,well pattern,produced-water,but which of low-yield Shan 66 is impacted by facies,interlayer and inlayer heterogeneity,well pattern and low pressure.