鄂尔多斯盆地南部延长探区长8油层组储层特征及影响因素分析
Chang-8 oil reservoir characteristics and its influencing factors analysis of Yanchang exploration area in southern Ordos basin
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摘要: 综合分析鄂尔多斯盆地南部延长探区的岩心、测井、铸体薄片、扫描电镜、阴极发光、X衍射、压汞分析等资料,对研究区长8油层组储层特征以及影响因素进行研究。结果表明长8油层组主要为长石砂岩和岩屑长石砂岩,成分成熟度低、结构成熟度中等;储层孔隙类型多样,粒间孔和长石溶孔为主要的储集空间,喉道类型以小孔微喉型为主;物性特点为典型的低孔低渗储层;储层明显受沉积相和成岩作用的综合影响。最有利的沉积微相为沉积厚度大、粒度较粗的水下分流河道微相;同时,建设性及破坏性成岩作用对储层物性改造具有双重作用,建设性成岩作用由于溶蚀作用使得物性变好,而破坏性成岩作用由于胶结及压实致使物性变差。Abstract: Through comprehensive analysis of core,log,cast thin section, scanning electron microscopy, cathodoluminescence,X diffraction,mercury and other data analysis of Yanchang exploration area in southern Ordos Basin,the research on Chang-8 oil reservoir characteristics and its influencing factors analysis of Yanchang exploration area in southern Ordos Basin has been carried out.The results showed that Chang-8 oil reservoirs are mainly of arkose and lithic feldspathic sandstone,with low compositional maturity and medium maturity structure.The pore types of reservoirs are varied,the intergranular pore and feldspar solution openings are of the main reservoir space.The throat type is mainly of small and micro throat and it is a typical low porosity and low permeability reservoir.The reservoirs are obviously affected by sedimentary facies and diagenesis.The most favorable sedimentary microfacies are underwater distributary channel microfacies with big sediment thickness and coarser particle size.Meantime,the constructive and destructive diagenesis has a dual role on reservoir property transformation.Due to dissolution,the constructive diagenesis can make the physical properties better,while due to cementation and compaction,the destructive diagenesis can cause the physical properties deteriorated.
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Key words:
- Ordos basin /
- Yanchang exploration area /
- Chang-8 oil layer /
- reservoir characteristics /
- pore structure /
- diagenesis
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