The Characteristics Of Sedimentary Reservoirs In The P1x 8 And P1s 1 Of The Su 75 Area Of Sulige

Sulige gas field is a typical tight sandstone gas field with low porosity,low permeability and low abundance,which is characterized by three low characteristics.The main gas bearing formations are two Triassic Shihezi Formation and Carboniferous Shanxi formation,in which the box 8 and the mountain 1 are the gas accumulation development section.The area is mainly fluvial facies,sand body is characterized by small scale,strong heterogeneity,poor connectivity,coarse facies gas gathered only in sandstone within(sandstone),complex formation conditions,the distribution of sand body is unclear,seriously restricted area development process.This research is mainly on the sedimentary microfacies,reservoir characteristics and other aspects of research.The sedimentary microfacies is through small layer contrast,sand distribution map in the area of each layer,and then carry out the work of the seismic reflection characteristics,internal and external phase types,the seismic analysis,using seismic waveform classification,determine the favorable facies types,through the combination of well and seismic,plane distribution characteristics of sedimentary facies.The study of reservoir is mainly based on the data of rock,ore,thin slice,rock property and mercury pressure.Through the above research,we have obtained the following understanding:1.sources come from the north of the study area,and the channel is distributed from north to south,swinging east-west.The sedimentary microfacies and effective sand bodies in the small layer are studied by thinning and layering.The sedimentary environment of the fluvial facies of the work area is basically reflected,and the sand body shows the distribution of North and south,and the change of the east to West sandstone is faster.2.Through the study of the reservoir,on the basis of rock physical properties,rock slices,mercury injection data,Su 75 block box 8 and Shan 1 reservoir lithology in fine quartz sandstone and lithic quartz sandstone;main reservoir rock composition of high maturity,low maturity structure;box 8 segment average porosity 9%,the permeability of 0.741 md,Shan 1 average porosity is 7.8%.The permeability of 0.785md;the low displacement pressure,high mercury saturation and exit efficiency is low,the reservoir is typical of low porosity and low permeability.3.seismic multi-attribute inversion is an effective method to predict gas reservoirs in this area.Get sandy content data through inversion screening,the effective sandstone stripped out,combined with the inversion of wave impedance data,will explain the standard of gas bearing sandstone reservoir with logging out,to achieve the purpose of predicting gas reservoir.