莺山凹陷沙河子组砂砾岩储层控制因素分析

Control Factors Analysis on Sandy Conglomerate Reservoir of Shahezi Formation in Yingshan Depression

莺山凹陷沙河子组资源潜力大,是松辽盆地深层的重要勘探领域。以往沙河子组储层研究相对较少,储层控制因素不清楚,制约了勘探部署。通过系统分析沙河子组储层与岩性、相带、埋深的关系,探讨了储层发育的控制因素,研究认为:砂岩物性最好,砂砾岩次之,粉砂岩最差;物性随最大古埋深减小,储层深度下限为4500m;(扇)三角洲前缘物性最好,(扇)三角洲平原次之,滨浅湖最差,最大湖泛面附近储层物性较好。根据以上认识,提出了莺山凹陷沙河子组有利储集区带预测的原则。

There was great resources potentiality in Yingshan depression Shahezi group. It was an important exploration area in deep zone of Songliao Basin. In the past, the study of the reservoirs in Shahezi formation was relatively few, reservoir control factors were not clear, the exploration was restricted in Yingshan depression. The relationship between reservoir and lithology, facies and burial depth in Shahezi formation were systematically analyzed, control factors of reservoir development was discussed in this paper. The study shows that： sandstone porosity is the best, followed by sand and gravel, siltstone worst; the porosity decreased with the maximum buried depth increased, the lower limit of reservoir depth is 4500 m; （fan） delta front face＇ s porosity is the best, followed by fan delta plains face, shallow lake face the worst; the reservoirs near the largest lake face is better. According to the above understanding, this paper puts forward the principle of forecasting the favorable reservoir zone of Shahezi formation in Yingshah depression.