Study On Reservoir Geological Model Middle Of The Middle Permian He8 Member In Su20 Area Of Sulige Gas Field

Su 20 area is located in the middle and west of Sulige gas field,and belongs to Yishan slope of Ordos basin in regional structure.The reservoir with low porosity,low permeability and low abundance in su 20 block has the characteristics of "thick sandstone reservoir",and the heterogeneity of lithology is serious.Through the establishment of three-dimensional reservoir geological model of the study area,the spatial distribution characteristics and internal physical heterogeneity of the effective sand body can be predicted from quantitative perspective,provide effective guidance for the reasonable layout of well location,adjust the stimulation measures and simulate the prediction yield.In this paper, based on the reservoir geological characteristics,through the combination of deterministic modeling and stochastic modeling,the fine geological research,the sand distribution as control conditions,subdivision stratigraphic unit,the stratigraphic framework model and tectonic model,and quantitative description of the small small layers.Then,using the sequential Gaussian simulation technology, the attribute model reflecting the three-dimensional spatial distribution and internal physical property parameters of reservoir effective sand body is established with the sand body distribution.In this paper, the results of reservoir geological modeling of box 8 show that the sue block is a low porosity,low permeability and low pressure elastic drive gas reservoir,the main gas layer is box 8,mountain 1,and the box 8 gas reservoir development and thickness,but only local reservoir properties; The reservoir physical property of the study area is controlled obviously,the diara and point bar sand bodies with good reservoir conditions are gulidianzhuang distribution;The connectivity difference of effective reservoir in three-dimensional space, high-quality reservoir only concentrated in several well area of study area,the reservoir property of the box 8 is better than the upper section of box 8.The three-dimensional skeleton model and attribute model of reservoir established by the distribution of sand bodies reflect the distribution of effective reservoir.The established reserves model shows that the reserves distribution and sand body distribution in the study area are very similar.By studying the geological causes of the three-dimensional reservoir geological model,the fluvial sedimentary characteristics of the 8 river,three-dimensional spatial distribution and heterogeneity of the effective sand body are analyzed,and the relatively good reservoir physical properties are optimized to lay a solid foundation for the development scheme optimization.It has reference significance to the reservoir geological study of other blocks in Sulige area.