Origin of extra-low permeability and controlling factors of the Chang-6 reservoirs in the Yongning prospect area, Zhidan Oil Field, Ordos Basin
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摘要: 综合应用测井资料和铸体薄片、扫描电镜、X-衍射、粒度分析等资料,对志丹油田永宁探区长6储层的特低渗透成因和主控因素进行了分析。结果表明:研究区长6储层特低渗透成因主要受沉积作用和成岩作用的双重影响,主要表现为沉积微相对储层物性的影响较大,水下分流河道砂层的物性好于河口坝沉积砂体,河口坝沉积砂体的物性好于分流间湾砂体沉积;成岩压实作用和胶结作用使得储层物性变差,成岩溶蚀及蚀变作用和成岩缝的产生对储层的特低渗物性的改善有积极作用。Abstract: The present paper gives a detailed description of the origin of extra-low permeability and controlling factors of the Chang-6 reservoirs in the Yongning prospect area, Zhidan Oil Field, Ordos Basin on the basis of well logs, cast sections, SEM, X-ray diffraction and grain-size analysis. The results of research show that both sedimentation and diagenesis, especially the sedimentary microfacies have an important effect on extra-low permeability of the Chang-6 reservoirs. In general, the porosity and permeability in the subaqueous distributary channel sandstones are better than those in the channel mouth bar sandstones, which in turn are better than those in the interdistributary bay sandstones. The compaction and cementation tend to be destructive to the development of the porosity and permeability, whereas diagenetic dissolution, alteration and fissures tend to be constructive to the improvement of the porosity and permeability of the reservoirs.
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