Reservoir Fluid Distributionin And Geological Modeling Of Su48 Well Block In Su-lige Gas Field

Su48 well block in Su-lige gas field belong to heterogeneity strongly lithology gas field. From the early development evaluation results analysis, this gas field belongs to the typical low porosity,low permeability and low resistivity gas field, which mainly displays in complex geological conditions, low porosity,low gas resistivity, low gas abundance, low single well production and poor economic. Scientific and accurate understanding of the geology and establishing a reasonable geological model of these gas fields is particularly important.By reference to previous knowledge of deposition of this well block,this well block is the river-delta deposition system.Three kinds of lithology can be identified in single well by logging, which are clay, sand and coal. Completion figure of every layer sand distribution is drew by the statistics of every layer sandstone thickness.The physical parameters in this well block are explained by entering the single well log curve and the parameters into multi-mineral log interpretation software, which are respectively Clay content, Porosity and Water saturation. Contrast between properties of logging interpretation and measured of lithology, the properties of log interpretation is thought to tally with the actual situation and can be used in this well block.By statistics,the low resistance gas layers are found in this well block, which is due to the presence of caly. According to the analysis, gas layers show low resistance by two aspects that are the formation of the clay bound water and clay minerals with high additional conductivity. On the basis of the causes of low resistivity, the fluid nature of the reservoir section of every well and layer in this well block is identified by establishing a low resistance gas well logging methods.As the introduction of low resistance gas logging recognition template, low-resistivity reservoir gas can be identified better. Low porosity and low permeability reservoirs in the Ordos basin are common,and causes of the formation of low resistivity is roughly the same, so it can refer to the identification methods of this study area.With the sand as the background, graphics of the distribution of formation water is drawn by the results of gas and water layers logging recognition, and tracking water in vertical. Through the tracking water, the formation water exists in two ways in this well block, which are Local side (bottom) formation water and Dense layer formation water. The Local side (bottom) formation water exsits in the form of free water due to the stratum water which is caused by different density of water and gas becoming water present in low- construction in accumulation process Dense layer formation water is formation water, because gas can not displacement formation water in dense layer in accumulation process;and through the water chemistry data were analyzed. In this paper, the division of dense water formation and recognition, you caneffectively explain the causes of producing a small amount of formation water, can also explain the causes of formation water desalination capacity, so the division of water production has a certain type of reliability.Combined with the sedimentary facies and distribution of formation water, micro facies and physical properties distribution is finally simulated by entering the coordinates, layers, logging physical interpretation of every well, and others into the modeling software. Through the simulation comparison , Sequential Indicator Simulation with sedimentary facies and Sequential Gaussian simulation distribution properties are more suitable for man to understand distribution of sedimentary facies and properties;and a reasonable test of the model, the model is consistent with geological understanding of the study area.