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Sweet spot identification and comprehensive evaluation method for tight sand reservoir

A technology for comprehensive evaluation of tight sandstone reservoirs, applied in geophysical measurement, instruments, etc., can solve the problems of insufficient precision of tight sandstone reservoirs, complex factors affecting the physical properties of tight sandstone reservoirs, and difficulty in effectively characterizing the porosity and permeability characteristics of tight sandstones. Effects of improving accuracy and reducing costs

Inactive Publication Date: 2017-11-03
EXPLORATION & DEV RES INST OFSINOPEC JIANGHAN OILFIELD
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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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  • Sweet spot identification and comprehensive evaluation method for tight sand reservoir
  • Sweet spot identification and comprehensive evaluation method for tight sand reservoir
  • Sweet spot identification and comprehensive evaluation method for tight sand reservoir

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[0052] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0053] The burial depth of Xu 4 Member of Xujiahe Formation in the northern Sichuan Basin is 4300-4800m. The physical property test data of more than 400 samples show that the maximum porosity of Xu 4 Member is 6.79%, the average is 3.67%, and 84.23% of the samples have porosity values ​​between Between 2 and 6% ( figure 1 ); the maximum permeability is 0.9431×10 -3 μm 2 , with an average of 0.051×10 -3 μm 2 , 88.93% of the sample permeability values ​​are less than 0.1×10 -3 μm 2 ( figure 2 ), which is a typical tight sandstone reservoir.

[0054] Below in conjunction with the examples and accompanying drawings of...

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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...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V11/00G01V9/00
CPCG01V9/00G01V11/00
Inventor 周林李雄刘浩天姚明君龙幼康王艳春丁青刘宇琦李蔚洋
Owner EXPLORATION & DEV RES INST OFSINOPEC JIANGHAN OILFIELD
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