鄂尔多斯盆地胡尖山区块长6储层孔隙结构研究

Research on Pore Structure of Chang6 Reservoir in Hujianshan Aera,Ordos Basin

油藏精细描述的重要方法之一就是对储层孔隙类型进行研究,通用的方法是对岩石铸体薄片、电镜扫描、压汞曲线等多种技术方法来分析。本文对鄂尔多斯盆地胡尖山区块长6储层的孔隙结构进行了深入研究。研究认为本区储集层主要孔隙类型是粒间孔隙,其次是长石溶孔、粒内孔。本区长6储层喉道类型主要以弯片状为主,其次为缩颈型喉道。本区内河口坝砂体喉道相对比较单一,但是分流河道砂体喉道的曲目相对较大,进而影响油气渗流性能。本区长6储层最主要的孔喉组合方式为残余粒间孔+溶蚀孔+细喉型组合。因此,认为胡尖山区块长6储层物性具有典型的低孔、超低渗特点。

One of the most important methods of reservoir fine description is to study the pore types of reservoir. The general method is to analyze the thin sections of rock,scanning electron microscope and mercury injection curve. In this paper,the pore structure of Chang 6 reservoir in Hujianshan aera,Ordos basin was studied. The results show that the main pore types of the reservoir are intergranular pores,followed by feldspar dissolution pores and intragranular pores. The Chang 6 reservoir throat type is mainly bending plate,followed by neck throat. In this area,the channel of the sand body is relatively simple,but the track of distributary channel sand body is relatively large,which affects the performance of oil and gas seepage. The Chang 6 reservoir pore-throat combination is the combination of main residual intergranular pores and dissolution pores and fine throats. Therefore,it is considered that physical properties of Chang 6 reservoir in the area are low porosity and low permeability.