马坊—红井子地区长9油层组储层与油藏特征分析

Reservoir characteristics analysis of Chang 9 oil reservoir in Mafang-Hongjingzi area

本文通过铸体薄片、扫描电镜和物性分析,认为鄂尔多斯盆地马坊-红井子地区长9油层组的储层属于低孔、低-特低渗储层。储层岩石类型以长石砂岩、岩屑长石砂岩为主,填隙物含量较低,以绿泥石粘土矿物和硅质、浊沸石胶结为主,剩余原生粒间孔和次生溶孔是储层主要的储存空间类型;综合储层沉积相类型、砂层厚度、物性、含油饱和度以及孔隙类型分类结果,将马坊-红井子地区长9油层组的储层分为5种类型,各类储层的分布主要受沉积微相、砂体展布的控制,大部分属于Ⅰ、Ⅱ类有利储层。马坊-红井子地区长9油层组油藏分布受岩性和构造双重控制,建立了研究区油藏2种成藏模式类型:岩性油藏和构造油藏两种类型,构造油藏可进一步分为小幅背斜构造油藏、断层构造油藏和复合构造油藏3种类型。

Through casting thin section, this paper thinks that the reservoir of scanning electron microscope and physical property, Chang low permeability in Mafang-Hongjingzi sandstone and lithic arkose sandstone, chlorite clay mineral cement with kiesel 9 oil reservoir have low porosity and low-extra area,Ordos basin.The lithology are mainly arkose having less interstitial material,which are mainly and laumontite,and the remaining primary inter- granular pore and secondary dissolved pore is the main storage space.Based on reservoir sed- imentary facies,thickness of sand layer,physical property,oil saturation and classification of pore, the reservoir of Chang 9 oil reservoir can be classified into iive categories in Malang- Hongjingzi area,whose distribution are mainly controlled by sedimentary microfacies and dis- tribution of sand bodies.As a result, most reservoir are belong to I favorable reservoir and 11 favorable reservoir.Moreover,the distribution of Chang 9 oil reservoir are controlled by both lithology and structure in Mafang-Hongjingzi area.Having established two hydrocarbon ac- cumulation models in the study area,lithology reservoir and structure reservoir, and the struc- ture reservoir can be further divided into three categories,which are minor anticlinal struc- ture reservoir,fracture structure reservoir and compound structure reservoir.