Analysis On Internal Architecture Of Thick Tight Sandstone And Its Three-dimensional Geologic Modeling In Sulige Gas Field

Sulige Gas Field is a field of low pressure and low permeability, low abundance,reservoir heterogeneity is strong, effective sand continuity and poor connectivity, single wellcontrolled low reserves, restricts the field of economic development.This thesis involving Su120block, which located in the Sulige Gas Field in the westerndistrict, covering an area of about4500km2, there are exploratory and development well158wells. The research layer is the8thmember of xiashihezi formation and the1st,2ndmember ofshanxi formation in study area. Mainly for the braided river delta, meandering river deltaplain and delta plain.Combination of sedimentology, petroleum geology and other related subjects. Firstlythrough sediment analysis,10original layers are divided into20sedimentary geology units.Secondly based on depositional period time and logging curves, useing fine commission layercontrast technology, and characteristic surface of standard layer contrast, and typicalsequence guidance contrast, and closed skeleton profile verification contrast closed, and so onto achieve the region-wide wells fine contrast. Thus establishing district-wide unifiedstandard of He8, Shan1, Shan2single sand body level high resolution sequence formationframework. And then establish3facies,3subfacies,27microfacies of type chart. Thirdly，application of fine reservoir description technology, on the basis of sandstone lithology andthickness of single well interpretation, gas-bearing reservoir evaluation, fine portrayed thatreflects its depositional characteristics of sandstone thickness, effective sandstone distributionof the group, sub member, small layers, as well as distribution map of vertical stacks.Through research and analysis concluded that He8sub member on the distribution map by2~4sometimes apart and sometimes composed of distributaries rivers. Vertical by at least2to3vertical stack of channel sand body, complicated relationships. Reservoir heterogeneity isstrong, effective sand continuity and poor connectivity, constrain the economic and efficientdevelopment of the gas field. Finally based on the distribution characteristics of sandstone,the effective reservoir distribution, characteristics of vertical overlay and planar graphs,portrayed with three dimensional geologic software outlet reservoir geological models.