A Quantitative Characterization Method of Shale Compressibility Based on Petrophysics

A petrophysical and quantitative characterization technology, applied in seismic signal processing, electrical digital data processing, special data processing applications, etc. and other problems, to achieve good application effect and promotion prospects, and improve the effect of description accuracy.

Active Publication Date: 2017-05-31
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

The fourth issue of Petroleum Drilling Technology in 2012 "Mechanical Properties and Brittleness Evaluation of Shale Gas Reservoir Rocks" used laboratory testing methods to test the mechanical properties of shale, but in actual exploration, high brittle shale formations are not available. Very good compressibility (such as Well L69), but has a relatively high compressive strength, indicating that the fuzzy evaluation of the compressibility of shale formations by brittleness index has great uncertainty

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  • A Quantitative Characterization Method of Shale Compressibility Based on Petrophysics
  • A Quantitative Characterization Method of Shale Compressibility Based on Petrophysics
  • A Quantitative Characterization Method of Shale Compressibility Based on Petrophysics

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Embodiment Construction

[0057] The following is attached Figure 1-9 The present invention is further described.

[0058] Step 1, refer to the fracture pressure empirical formula and the known measured formation parameter data (P p ,u,P o , K), to obtain the fracture pressure of the well

[0059]

[0060] P f : burst pressure P p : Pore pressure

[0061] u: Poisson's ratio P o : Overburden pressure k: Compressive strength

[0062] By comparing the numerical analysis of the fracture pressure and the maximum principal stress, combined with the actual measured porosity curve and laboratory analysis results, it can be seen that when the maximum principal stress is greater than the fracture pressure, fractures are generated, and the porosity of the reservoir is better, which is defined as a Type II reservoir; when the maximum principal stress is approximately equal to the fracture pressure, although the porosity is poor, it is still a stratum with good compressibility, and the physical propertie...

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Abstract

The invention discloses a method for quantitatively characterizing the shale compressibility based on rock physics. The method comprises the following steps: (1) establishing a shale compressibility mathematical model; (2) analyzing the relationship between formation parameters and mechanics, and preferably selecting formation mechanical parameter characterizing factors; (3) regressively fitting a compressive strength elastic parameter characterization formula and establishing a formation fracture pressure elastic parameter characterization formula and a principal stress elastic parameter characterization formula; (4) establishing a compressibility index characterization formula, and verifying and calculating a compressibility index comprehensive data body; and (5) quantitatively characterizing and predicting the formation compressibility. According to the method, effective characterization factors of shale formation compressibility are selected through multi-parameter analysis to establish a shale compressibility index characterization formula, so that quantitatively characterization of shale compressibility is realized, the identification standard of shale compressibility is established, target optimization of formation fracturing reformation layers can be guided, the cost of shale exploration is reduced, and the success rate of shale exploration is effectively improved.

Description

technical field [0001] The invention relates to the field of formation compressibility evaluation methods in the geological exploration process of unconventional oil and gas reservoirs, in particular to a quantitative characterization method for analyzing and evaluating the compressibility index of mud shale based on rock physics. Background technique [0002] The compressibility of formation is to characterize the feasibility of deformation, fracture and destruction of formation under the action of external force. The research and evaluation of formation fracturability has clear guiding significance for the effectiveness of in-situ stress action, fractured formation prediction, and reservoir fracturing stimulation. [0003] At present, no scholars have used geophysical data to predict the compressibility of shale formations. The SPE115258 document "A Practical Use of Shale Petrophysics for Stimulation DesignOptimization: All Shale Plays Are Not Clone of the Barnett Shale" u...

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Application Information

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IPC IPC(8): G01V1/28G06F17/50
Inventor 刘建伟张营革谭明友巴素玉张云银师涛陈香朋庞红磊时瑞坤魏欣伟孙兴刚
Owner CHINA PETROLEUM & CHEM CORP
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