Sweet spot identification and comprehensive evaluation method for tight sand reservoir

Abstract

The invention discloses a sweet spot identification and comprehensive evaluation method for a tight sand reservoir. According to the method, eight conventional logging curve data are taken as a basis. By utilizing the SPSS data analysis software, common factors capable of comprehensively reflecting the characteristics of a reservoir in a target area are extracted based on the PCA (principal component analysis) method. According to the physical significance of each common factor, the sweet spots of the tight sand reservoir are recognized, and a sweet spot qualitative recognition model for the tight sand reservoir is established. On the above basis, a common factor calculation model for porosity and permeability is established in conjunction with physical property test data, so that the types of the reservoir are divided. According to the physical property parameters of various reservoir types and the parameter characteristics of common factors, a quantitative evaluation standard for the tight sand reservoir is determined. Therefore, the qualitative recognition and the quantitative evaluation for the sweet spots of the tight sand reservoir are realized. Based on the method, a novel idea and a novel method are provided for the interpretation and evaluation of the tight sand reservoir. Therefore, the interpretation and evaluation reliability of the tight sand reservoir is improved. The exploration and development cost is reduced.

Description

technical field [0001] The invention relates to oil and gas reservoir evaluation technology, in particular to a tight sandstone reservoir sweet spot identification and comprehensive evaluation method. Background technique [0002] At this stage, the world has entered the stage of stable production of conventional oil and gas and rapid development of unconventional oil and gas, and tight gas has become the key direction of unconventional natural gas development. Currently, tight gas accounts for nearly four-fifths of global unconventional natural gas production. Tight sandstone gas reservoirs are widely explored in China. Ordos, Sichuan, Songliao, Tarim, Qaidam and Bohai Bay basins all have favorable geological conditions for forming tight sandstone gas reservoirs. Tight sandstone gas is currently the most realistic unconventional natural gas in China. resource. [0003] Tight sandstone gas refers to sandstone gas reservoirs with overburden matrix permeability less than or e...

AI Technical Summary

Problems solved by technology

Quantitative evaluation of reservoir porosity, permeability, saturation and other parameters is an important aspect of reservoir logging evaluation and interpretation. Compared with conventional reservoirs, the accuracy of logging interpretation of tight sandstone is far from enough. Interpretation and evaluation methods are not fully applicable to tight sandstone reservoirs

[0004] Predecessors have done some research and exploration on the interpretation and evaluation of tight sandstone reservoirs, which laid the foundation for the interpretation and evaluation of tight sandstone reservoirs and opened up ideas. It is difficult to effectively characterize the porosity and permeability characteristics of tight sandstone with a single parameter, and it is difficult to effectively evaluate tight sandstone reservoirs only with porosity and permeability parameters. An effective identification and comprehensive evaluation method for "sweet spots" of tight sandstone reservoirs is urgently needed

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