Abstract:

According to exploration, there is a direct relationship between sandstone type and gas saturation in the east Ordos basin. The highproduction layer emerges from quartzose sandstone. Therefore, the emphasis of exploration and development is to explore quartzose sandstone reservoir. After calibrating well logging with core analysis, three types of spider web chart of sandstone are drawn with well logging parameters. Regression equations on quartz content of sandstone and logging parameters is established, which is used to identify the types of sandstone. The rate of accuracy is 80%. At the same time, the sandstone type plane distribution map has been drawn up with rock slice and research data. In the research area there are three zonal distributive region of quartzose sandstone. From the tectonic environment, source and sedimentary environment, the reason of that has been carried on the discussion. The primary factor was frequent coastlines influenced by regression. This research is to provide the basis for the further exploring of gas sweet point and analyzing the detritus grain component with well logging data

Key words: Ordos basin, sandstone type, discriminant chart, regression equation, analysis of genesis