Reservoir Description On Triassic Of Zengcha Oildom, Wuqi

With developing towards high pressure、high velocity and large horsepower of hydraulic system, the pressure fluctuation and noise of hydraulic system have become major problems which encumber the development and need to be solved urgently. In Triassic system, river subject in the study area in the north east, south west to the distribution of sand body is very development, sandstone thickness, transverse stretching far away, it provides the oil and gas accumulation of good reservoir space. Yan-10 reservoir group is mainly for the braided river and river sand body deposition, generally with lower mineral maturity and structure maturity of medium-high characteristic. Chang4+5, Chang6, and Chang9 reservoir group are mainly delta front underwater distributary channel deposition. Reservoirs are mainly consist of fine sandstone and siltstone. Sandstone and coarse sandstone in very small amounts, the overall performance of the characteristics of low compositional maturity and high textural maturity. Sandstone reservoir pore types of Yan1O-Chang9 oil group are mainly intergranular pores, accounting for 3.9% of the total pore types; Secondly are intragranular bore hole, molds, feldspar dissolution. All kinds of pore of the total face average rate of 6.4%. Yan10, Chang4+5, Chang6, and Chang9 reservoir group reservoir are belong to micro-fine throat reservoir,and mainly for small holes through them. Mainly for a low pore and low permeability to low hole-extra low permeability reservoir. Reservoir sedimentation and diagenesis are the main factors affecting reservoir in this area. Yan10, Chang4+5, Chang6, and Chang9 reservoir are lithologic reservoir, the reservoir drive type is given priority to with elastic drive and dissolved gas drive. According to the oil and gas reserves calculation standard requirement, the study area were estimated proven oil geological reserves of 7526.26×1041.