【摘要】 松辽盆地南部大老爷府地区早白垩世泉头组泉四段,三角洲前缘沉积体系中以水下分流河道和河口坝两种储油微相为主导的多种微相组合,提出将其划分为"水下分流河道区"、"水下分流河道与河口坝混合区"和"河口坝区"三段微相组合区。将水下分流河道进一步划分为废弃型、完整型和多期叠加型3种;识别出坝上河混合微相组合;将河口坝组合再划分为完整型河口坝和叠加型河口坝。讨论了在坳陷湖盆条件下三角洲前缘厚层储集砂体各微相组合的形成机制以及分布模式。更多还原

【Abstract】 The delta front was developed in Early Cretaceous strata of Dalaoyefu area, Songliao basin. This paper has studied the variety of microfacies combination, dominated by the distributary channel and mouth bar, in the delta front depositional system. The microfacies combination can be classified into "distributary channel area", "distributary channel and mouth bar mixed zone" and " mouth bars area". A detailed study of characteristics of the delta front depositional facies shows that the abundant sandbodies can reflect different sedimentary environments. For example, submerged distributary channels are divided into Abandon Type, Integrity Type and Multi-phase Overprint Type, and the mixed-facies combination is identified; The mouth bar can be divided into Complete Mouth Bar and Stack-mouth Bar. This paper has also discussed the formation mechanism and the model for distribution of the microfacies combinations of the reservoirs in delta front.更多还原