Study on Microfacies and Reservoir Characteristics of the Delta-Front Sandbody of the First Submember of the Second member of Dongyin Formation, Oligocene Series in Dalujia Area
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摘要: 通过岩芯、录井、测井资料的综合分析，发现大芦家地区渐新统东二段主要由三角洲前缘亚相组成，砂体的成因类型主要包括三角洲前缘亚相的河口坝、水下分流河道、水下天然堤和决口扇、席状砂、远砂坝。它们不仅具有各自独特的沉积特征和测井相特征，而且其空间储集物性的分布也各不相同。此外，它们还具有较强的层内非均质性，层间非均质性和平面非均质性却较弱。Abstract: The sandstone reservoir of Dongyin Formation, Oligocene Series in Dalujia area is one of the main produc- tion formation of Linpan Oil Field in the Eastern area of China.Its depositional system including delta, espe- cially the delta front part, and its sandbody genetic type including river -mouth bar, sublacustrine distributary channel, sublacustrine levee, sublacustrine crevasse splay and distal bar, have been identified though compre- hensive analysis on core, logging and well log data, and all these sandbody microfacies have different deposi- tional characteristics, well log facies, porosity and permeability.In addition, these sandbodies have strong in- traformational nonuniformity and not so strong an interstratal one.
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Key words:
- sandbody /
- microfacies /
- delta front /
- reservoir characteristics
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