Reservoir Evaluation Of Chang2Oil-bearing In Resiwan District In Zichang Oilfiled

Reservoir evaluation is the core of oil (gas) reservoir description，It is to use theinformation of earthquake，logging，coring devices，testing and exploitation which acquisitionfrom the process of the oil and natural gas exploration and development，to description thevarious aspescts of characteristics of reservoir and achieving the aim of reservoir evaluationThis paper aimed at making a detail reservoir description for Chang2reservoir group of Re SiWan region of Zichang oilfield，Research shows that the reservior structure is simple，Thewhole performance are high in the east and low in the west.This structure features areconsistent with the Ordos basin，Partial structure appears the small nose shape and indentationarea.Through the detailed observation of the study of core，logging，well logging and surfaceprofile of adjacent area，this paper summarizes that Chang2reservoir group of the researchdistrict is the braided ricer sedimentary model. Sedimentary micro-facies develop riverstranded，beaches and flood plain.Reservoir sandstone is mainly fine-grain feldspar sandstone，The detritus component is unitary，the grain size is fine，the separation is good，the depositstructure maturity is high，the mineralogical maturity is low；The research area main porositytype are intergranular dissolved pore and remaining particle-hole.Porosity and permeabilityare low average value.The anisotropism is strong.At the same time，an analysis of reservoirsensitivity Indicates that Chang2reservoir group of research area are low-medium velocitysensitivity，low-medium water sensitivity，low acid sensitivity，low salt sensitivity，andmedium allkali sensitivity.Finally， according to reservoir classification standard， thereserviors in the study area belongs to third type and fourth type of reservoir.