姬塬-白豹地区测井系列的优化评价

Optimizing Evaluation of Logging Suite in Jiyuan-baibao Area

姬塬-白豹地区油藏具有低渗透率、低压、低产"三低"特点,测井系列优选对储层精细评价尤为重要。利用同一口井中不同仪器测量的资料对比,进行电阻率测井选择定量评价,同时对孔隙度、岩性测井选择进行评价。给出该区常规测井系列选择的最佳方案是电阻率测井选择俄罗斯感应、高分辨率感应、阵列感应测井;孔隙度测井选用声波时差、密度、补偿中子测井;岩性测井选择自然伽马、自然电位测井;根据地质评价目标选择声电成像测井、核磁共振测井、阵列偶极声波测井等特殊项目。目前长庆油田大规模使用该套方案,对储层精细评价起到重要作用。

Oil reservoir is characterized by low permeability, low pressure and low productivity in Jiyuan-baibao area, known as the ＂three-low＂, so the selection of logging suites is important to accurate evaluation of the reservoir. Comparing with log data of the different logging suites in the same well, quantitatively evaluated is resistivity log suite, and evaluated are the porosity log suite and lithologic log suite. Proposed is the best optimum scheme of conventional logging in this area, such as, selecting induction log of Russia（HIL）, high resolution induction log （HRI） and array induction as resistivity log suites（MIT）, selecting sonic wave slowness, density and compensated neutron log as porosity log suites, selecting gamma ray log, natural potential log as lithologic log suites, selecting some unconventional logs such as electric-imaging log, nucleus magnetic resonance and array sonic log according to the purpose of geologic work. The selection is extensively used in Changqing oilfield recently, it plays an important role in accurate evaluation of such reservoir.