克拉玛依油田J_1b^5油层有效厚度研究

Study on net pay in J_1b^5 reservoir of Karamay Oilfield

针对克拉玛依油田五区八道湾组(J1b5)油藏有效厚度划分中存在的问题,提出了油层有效厚度划分的图版参数。首先利用目的层段电阻率与声波时差关系确定有效厚度的岩性标准,再根据油藏地层水电阻率和a、b、m、n参数值,采用含油饱和度图版法确定油层有效厚度的电阻率、孔隙度和含油饱和度的下限标准。从而,在油层有效厚度评价中精细地识别储层的岩性、物性和含油性,有效地剔除储层中的砾石层、泥质层、致密层、干砂层和差油层,确定各井的有效厚度,提高了测井解释和储量计算的精度,为该区油藏增储上产和预测剩余油分布提供了可靠依据。

Chart parameters are proposed for net pay thickness division in accordance with the problems in net pay thickness division in J_1b^5 reservoir,Badaowan formation,Block 5,Karamay Oilfield.The lithology standard of net pay thickness is determined by using the R_t and Δt relation in target zone,and the cut-off value of resistivity,porosity and oil saturation in net pay are determined by using oil saturation chart board in accordance with formation water resistivity and a,b,m,n value.Therefore,the lithology,petrophysical property and oilbearing property of reservoirs can be identified to recognize gravel bed,shale, tight zone,dry sand and poor oil reservoir,to determine the net pay in each well,to improve the accuracy of log interpretation and reserve estimation,and to provide reliable basis for finding more reserves and residual oil distribution in this region.