CLASSIFICATION AND EVALUATION OF CHARACTERISTICS THE CHANG-3 RESERVOIR IN ORDOS BASIN CHINA
Ordos Basin is rich in oil and is one of the key exploration and development areas for resource replacement. In this paper, the Chang-3 reservoir in Yanwu-Sancha area of Ordos Basin was classified, and the characteristics of which was evaluated based on the optimized method. The casting thin section...
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Veröffentlicht in: | Fresenius environmental bulletin 2021-11, Vol.30 (11), p.11980 |
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Sprache: | eng |
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Zusammenfassung: | Ordos Basin is rich in oil and is one of the key exploration and development areas for resource replacement. In this paper, the Chang-3 reservoir in Yanwu-Sancha area of Ordos Basin was classified, and the characteristics of which was evaluated based on the optimized method. The casting thin section, reservoir rock sample and mercury injection tests were carried out to analyze the the characteristics. The correlation between the evaluation results and reservoir characteristics under fuzzy quantitative-analytic hierarchy process, parameter analysis, probability statistical analysis and heavy mineral analysis was compared. The results showed that: among the four reservoir evaluation methods, the fuzzy quantitative-analytic hierarchy process has the strongest correlation with reservoir characteristics, and it is the best evaluation method in the study of target reservoir. It is found that the overall debris content of Chang-31 is higher, quartz content is the main content in Chang-32 and Chang-33, and the density of intergranular pores and sandstone from top to bottom shows an increasing trend. The porosity distribution range is 1.99%~22.4%, and the permeability distribution range is 0.13-25.12xl0~3[im2, with an average of 6.21 x 10 3nm2. It belongs to ultra-low permeability reservoir. Generally speaking, the physical properties of Chang-3 reservoir gradually become worse from west to east, and type I reservoir is sporadically developed in some parts, but the scale is small, and type II reservoir is widely distributed, which is the main target area of exploration and development. |
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ISSN: | 1018-4619 1610-2304 |