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四川盆地磨溪区块龙王庙组储层为一套发育孔、洞、缝3种储集空间的白云岩储层。孔、洞、缝配置的多样性,造成不同滩体部位的储层物性及产能差异大,储层非均质性强,连通性评价难度大。针对这类储层的特点建立了动态、静态相结合的气井连通性评价方法,首先用静态分析法(地质特征、原始地层压力和流体性质对比分析方法)初步评价气藏(井)的连通性,再用动态分析法(试井、类干扰试井和生产动态分析法)进一步评价气藏(井)的连通性。最后,基于连通气井达到拟稳态渗流后,气井的配产与井控动储量成正比的渗流理论,结合动静态分析法的结果综合评价气藏(井)的连通性。通过该方法评价磨溪9井组的连通性,认识到该井组处于滩体的主体部位,气藏性质相同,新投产的井地层压力均下降,试井曲线无明显边界特征,生产动态曲线出现井间干扰现象及气井的配产与井控动储量成正比,证明气藏(井)的连通性好。由于磨溪009-X6井投产时的地层压力高于同一时间相距1.5km的磨溪009-X1井的地层压力,进一步说明该气藏(井)连通具有方向性。
The Longwangmiao Formation reservoir in Moxi block in Sichuan Basin is a set of dolomite reservoirs with three kinds of reservoir space with holes, holes and seams. The variety of holes, holes and seams makes the reservoirs have different reservoir physical properties and productivity, and the reservoir heterogeneity is strong and the connectivity evaluation is difficult. According to the characteristics of these reservoirs, a dynamic and static gas well connectivity evaluation method is established. Firstly, the static analysis method (geological characteristics, original formation pressure and fluid property contrast analysis method) is used to evaluate the connectivity of gas wells , And then use dynamic analysis (well test, interference test and production dynamic analysis) to further evaluate the reservoir (well) connectivity. Finally, based on the percolation theory that the gas well is proportional to well reserves after the quasi-steady state seepage flow is reached, the connectivity of the gas reservoir (well) is comprehensively evaluated based on the results of dynamic and static analysis. Through this method, the connectivity of Moxi-9 well group is evaluated. It is recognized that the well group is located in the main part of the beach body. The properties of the gas reservoirs are the same. The formation pressure of newly-produced wells is decreased. There is no obvious boundary characteristic between the well test curves and the production dynamic curve The phenomenon of inter-well interference and the distribution of gas wells are directly proportional to well reserve reserves, which proves that the reservoir (well) has good connectivity. The formation pressure of Moxi 009-X6 well is higher than the formation pressure of Moxi 009-X1 well 1.5 km apart at the same time, which further indicates that the well (well) has directional connectivity.