准噶尔盆地中部X区块非均质砂岩储层的测井解释评价

Well Logging Interpreting Evaluation of Heterogenous Sandstone Reservoir in Block X in the Middle of Junggar Basin

准噶尔盆地中部X区块为较复杂的岩性油藏 ,储层非均质性使得储层的束缚水饱和度变化很大 ,干扰了直接用电阻率、含油饱和度评价储层 ,给测井解释带来了较大的困难 ,因此求准束缚水饱和度是测井解释评价的关键。根据X区块岩心的分析化验资料和岩电、核磁实验的束缚水饱和度资料回归出适合本地区的粒度中值和束缚水饱和度公式 ,用测井资料求准束缚水饱和度和含油饱和度 ,再用二者求得可动水饱和度 ,用可动水和含油饱和度一起评价储层 ,提高了测井解释符合率 。

X Block in the middle of Junggar Basin is a more complicated lithologic reservoir. Great changes of saturation of irreducible water are caused by reservoir heterogeneity, by which interference on reservoir evaluation with resistivity, oil saturation is caused, resulting in great difficulties on logging interpretation, thus obtaining accurate irreducible water saturation is the key of logging interpreting evaluation. Based on the data of core assaying, litho-electric and nuclear magnetic experiments, the regression of formulae of median value of grain and irreducible water saturation which is suitable to the area are conducted, and then the logging data are used to derive accurately the irreducible water saturation and oil saturation, by which movable water saturation is obtained, the movable water saturation and oil saturation are used to evaluate the reservoirs, thus logging coincidence rate is improved with good geologic application effect.