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在前人研究的基础上,结合野外露头剖面、岩心观察、成像测井特征、碎屑岩组分特征、石英阴极光以及重矿物特征分析等方法,对鄂尔多斯盆地陇东地区长9油层组进行了物源分析。研究表明,物质来源来于4个方向,即东北、西北、西南和南缘,且主要受西南部物源方向影响。母岩以西南部祁连-秦岭褶皱带、西北阿拉善古陆和南部古秦岭高级变质岩和酸性岩浆岩为主体。在上述研究的基础上,结合沉积相标志分析,对该研究区进行了沉积相、亚相以及微相的识别和划分。研究区西北部分主要发育三角洲平原和三角洲前缘;西南和东北主要发育三角洲前缘沉;陇东地区东北角部分发育滨-浅湖亚相沉积。结合物源和沉积相研究,进一步总结出分流河道、河口坝以及远砂坝等微相为砂体有利储集相带。
Based on the previous studies, combining with the outcrop profile, core observation, imaging logging features, the composition of clastic rocks, the cathodic light of quartz and the characteristics of heavy minerals, the Chang 9 oil layer in the Longdong area of Ordos Basin The source analysis. The results show that the source of the material comes from four directions, that is, the northeast, the northwest, the southwest and the southern margin, and is mainly affected by the source direction of the southwest. The parent rocks are mainly composed of the Qilian-Qinling fold belt in the southwest, the ancient land in the Northwest Allasia and the ancient Qinling high-grade metamorphic rocks and acidic magmatic rocks in the south. Based on the above studies, the sedimentary facies, subfacies and microfacies are identified and divided in this study area based on the analysis of sedimentary facies markers. The northwestern part of the study area mainly develops the delta front and delta front; the main developed delta front in the southwest and northeast; and the shore-shallow lake subfacies in the northeast corner of Longdong. Based on the study of provenance and sedimentary facies, it is further concluded that microfacies such as distributary channels, estuarine dams and distant sandbars are favorable reservoir facies belts.