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针对济阳坳陷埕北地区变质岩油藏有效储层识别和储层参数解释中的难点,在变质岩储层特征研究的基础上,利用补偿中子—自然伽马交会图与暗色矿物含量识别岩性的方法可有效区分煌斑岩类、花岗岩类和闪长岩类。通过FMI测井和裂缝指示曲线对储层裂缝进行识别。采用核磁共振分析孔隙度、FMI分析缝洞孔隙度与声波时差计算有效孔隙度、三孔隙度法计算缝洞孔隙度交互验证完成储层孔隙度解释,两者平均绝对误差为±1%左右。采用体积分配法和核磁共振测井饱和度解释,确定了储层含油饱和度。在储层四性关系研究基础上,制定了太古界有效储层识别标准,太古界主要含油岩性为片麻岩,含油性标准定为荧光以上(含荧光),有油气显示井段电阻率一般小于2000Ω·m,孔隙度一般大于3%,测试出油气井段全烃含量与无油气显示层全烃含量相对比值一般大于等于2。该方法在胜利油区太古界变质岩油藏储量计算中得到应用,实现了埕北地区和王庄地区变质岩油藏有效储层识别与储层参数计算,取得了较好效果。
In view of the difficulties in identifying effective reservoirs and interpreting reservoir parameters in the metamorphic rock reservoir in the Chengbei depression in the Jiyang Depression, based on the study of the metamorphic rock reservoir characteristics and using the compensation neutron-gamma ray cross-plot and the dark mineral content The method of identifying lithology can distinguish lamprophyre, granite and diorite effectively. Reservoir fractures are identified by FMI logs and fracture indication curves. The porosity was analyzed by NMR, the effective porosity was calculated by FMI analysis and the jet lag, and the porosity was verified by the three-porosity method. The average absolute error was ± 1%. Volumetric distribution method and NMR saturation logging were used to determine oil saturation in reservoirs. Based on the study of the quaternary relationship of reservoirs, the effective reservoir identification standard in the Archean is established. The main oil-bearing lithology in the Archean is gneiss, the oil-bearing standard is set above fluorescence (including fluorescence), and the resistivity of well section Generally less than 2000Ω · m, the porosity is generally greater than 3%, the total hydrocarbon content of oil and gas wells were measured and the relative ratio of total hydrocarbon content without oil-gas display layer is generally greater than or equal to 2. The method is applied to the calculation of the Archean metamorphic rock reserves in Shengli Oil Region, and the effective reservoir identification and reservoir parameters calculation of the metamorphic rock reservoirs in the Chengbei and Wangzhuang areas are realized. The good results are obtained.