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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 ways to describe the reservoir accurately is to study the pore types of the reservoirs. The common method is to analyze a variety of technical methods such as thin film of rock castings, scanning electron microscopy and mercury intrusion. In this paper, the pore structure of Chang 6 reservoir in Hujianshan block, Ordos Basin, is deeply studied. The study suggests that the main pore types in the reservoir area are intergranular pores, followed by feldspar and intragranular pores. The main reservoir 6 throat type mainly curved sheet, followed by neck throat. The sandstone throat of the mouth bar of the estuary dam is relatively simple in this area, but the track of the throat of distributary channel sand body is relatively large, which in turn affects the seepage performance of the oil and gas. The main pore-throat combination of reservoir 6 in this area is residual intergranular pore + dissolution hole + fine throat type. Therefore, it is considered that the reservoir properties of Block 6 in Hujianshan block have typical characteristics of low porosity and ultra-low permeability.