卞东油田阜三段沉积微相及储层非均质性研究

卞东油田阜三段为三角洲沉积,发育三角洲前缘亚相。通过岩心与测、录井数据观察分析本区三角洲沉积特征,识别相标志,划分出水下分流河道、河口沙坝与前缘沙席三个主要的沉积微相,其中水下分流河道与河口沙坝是本区储层的主体相带。储层层内、层间及平面非均质性较强,隔层趋向分布于远离物源的方向,砂体连通性差,平面非均质性受沉积相带及砂体展布形态控制。

Sedimentary microfacies and heterogeneity of Member 3 of Funing Formation of Biandong Oilfield

BasedSon studying the geological background, using gas logging data as well as discriping core, the sedimentary characteristic of Member 3 of Funing Formation of Biandong Oilfield were analyzed . The authors come to theSconclusion that E1f3 is delat environment and there mainly are delta front subfacies, which includes microfacies of subsea distributary channel, mouth bar , sheet sand, bar between branches, interdistributary bay. Microfacies vary withSreservoir properties, while distributary channel and mouth bar provide more reservoir spaces. Barrier distributes continuously and tend to thicken as far away from the material source. TheSareal heterogeneity, controlled by planar distributionSof sand bodies and facies, is higher due to bad connectivity as well as rapid lithofacies change,while the inter-reservoir and within-reservoir heterogeneities in the area are severe.