赵凹油田安棚区核三下段的沉积模式

在对赵凹油田安棚深层系核（核桃园组）三下段砂体的研究中，从岩性特征，结构和成分成熟,沉只构造及古生物特征等方面总经了该区沉积的相标志，结合研究区的沉积背景，笔者认为该区沉积环境为扇三角洲相，并进一步划分了亚相和同相，提出了研究区扇三角洲相的沉积模式，并对扇三角洲砂体的类型进行了研究。该区发育扇三角洲前缘亚相和前扇三角洲两种亚相，近岸水道和远岸水道微相比较发育；距离物源较近，沉积物搬运距离短，沉积物粒度较粗，结构成熟度和成分成熟度较低，水动力较强，在砾岩和粗砂岩中发育有块状层理，平行层理和交错层理，砂体类型对储集层物性有明显的控制作用。

Sedimentary model for the lower part of the third member of the Hetaoyuan Formation in the Anpeng district, Zhao'ao oil field, Henan

The facies indicators and fan delta sequences in the lower part of the third member of the Hetaoyuan Formation in the Anpeng district, Zhao'ao oil field, Henan are dealt with in the light of lithology, textural and compositional maturity, sedimentary structures and palaeontology. The sedimentary environments are dominated by the fan delta facies, which may be subdivided into the fan delta front subfacies and profan delta subfacies, and nearshore channel microfacies and offshore channel microfacies. The subfacies and microfacies outlined above are characterized by proximal provenances, shorter distance of transport, coarser grain sizes of sediments, lower textural and compositional maturity, intense hydrodynamics, well-developed massive beddings, parallel beddings and cross beddings in conglomerates and coarse-grained sandstones.