| There are huge oil and gas resources in terrestrial low-permeability reservoir in China. It is a great challenge to reservoir geologists on how to enhance oil recovery and oil production rate in such tewestrial low-permeability reservoir. The author, taking the Pu333 block of Punan oilfield as anatomical objects, guiding with reservoir sedimentology and reservoir geology, using full and accurate data on well core, well logging, and microscopic analysis, etc. put fine layers divided into sedimentary units and united them in the whole area, fine dissected the microfacies and single sandbodies in the development zone, studied reservoir properties and heterogeneity, microscopic characteristics of the reservoir. At last, with the methods of multi-disciplinary, multi-evaluation, comprehensive evaluation, the author evaluated the oil layer of Fuyu in categories, vertical, plane three aspects. According to the size of sand, sand body development level and characteristics of the physical properties,reservoir in the area vertically was divided into three categories and six sub-categories, where FⅠ71, FⅠ72, etc. are NO.1 oil layers,FⅠ51, FⅠ73, FⅡ12 etc. are NO.2 oil layers,FⅠ11, FⅠ22, FⅡ22, FⅡ51 etc. are NO.3 oil layers. The results from the vertical evaluation, through different types of reservoirs superposited, the sand body and the degree of development of the reservoir considered, indicates PF153-382, PF171-422 are the NO.1 reservoirs, the areas of PF162-472, PF168-532 are the NO.2 reservoirs,the areas of PF160-332, PF178-492 are the NO.3 reservoirs. Through detailed vertical and plane evaluation, the 12 small oil layers, 25 sedimentary units of Fuyu oil layer are evaluated comprehensively. Meanwhile, the spatial distribution of single sandbody, the main oil layers and favorable reservoirs are pointed out. This study is an important foundation for exploration and development of the Punan oilfield and the method can be applied in the similar oil fields. |
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