【摘要】 缝洞型碳酸盐岩油气藏在年度新增探明储量中占有重要地位,但从储量落实程度看,较常规砂岩油气藏计算结果精度偏低。研究表明,缝洞型碳酸盐岩油气藏储集空间类型复杂,包括溶蚀洞穴、孔洞、孔隙及裂缝等,储集空间级差较大,以孔洞、裂缝为基础的传统的两级单元划分方法不尽合理。各类储集空间发育状况表明,裂缝型及孔隙型储层普遍发育;孔洞型和洞穴型储层呈透镜体状分布,空间分布连续性差,因此与孔隙型储层合并计算导致了各计算单元的平均孔隙度计算结果偏大。根据不同孔隙度的储层其含油饱和度具有"三段式"分布的特征,以及单层孔隙度值与裂缝发育情况,细分了储量计算单元,将储层划分为Ⅰ级(≥15%)、Ⅱ级(15%~5%)、Ⅲ级(<5%)及Ⅳ级(裂缝段)计算单元,从而有效地提高了油气储量评估结果的精度。更多还原

【Abstract】 The fracture-cavity carbonate reservoir plays an important role in the annual new and discovery reserves.Compared to the conventional sandstone reservoir,the reserve implementation degree is relatively low.The pore type of carbonate reservoir is complex,including solution caves,vuggy,pores and fracture.The traditional classification method according to pore and fracture is not applicable.The porosity and fracture reservoir is widely developed;the vuggy and cavity reservoir is distributed in lens type which indicates poor continuity in spatial distribution.Therefore,the integrated calculation with pore reservoir results in the higher value of average porosity of each calculation units According to the three section distribution type of oil saturation in layer with different porosity,the porosity of reservoir is classified into more than15%,15%-5%,and less than 5%,which can effectively improve the accuracy of evaluation results.更多还原