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Shale reservoir stratum Young modulus and Poisson's ratio obtaining method based on conventional logging data

A conventional well logging data and shale reservoir technology, which is applied in the field of shale reservoir fracturing to provide key evaluation parameters, can solve the problems of difficult logging construction and high risk, and achieve good production and application effects

Active Publication Date: 2014-11-19
LOGGING CO SINOPEC OILFIELD SERVICE JIANGHAN CORP
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AI Technical Summary

Problems solved by technology

The mining of shale reservoirs mostly adopts ultra-long horizontal section horizontal well mining (horizontal section length > 1500m), and logging construction is difficult and risky

Method used

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  • Shale reservoir stratum Young modulus and Poisson's ratio obtaining method based on conventional logging data
  • Shale reservoir stratum Young modulus and Poisson's ratio obtaining method based on conventional logging data
  • Shale reservoir stratum Young modulus and Poisson's ratio obtaining method based on conventional logging data

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example 1

[0050] Example 1. Well A in FL shale gas field

[0051] The logging evaluation of the 2480.0-2575.0m section of the lower part of the Longmaxi Formation in Well A of the FL shale gas field - Wufeng Formation is a shale gas layer with a thickness of 85m. The application of the present invention provides Young's modulus and Poisson's ratio parameter.

[0052] 1. Acquisition of regional experience parameters

[0053] Well JY1, the first shale gas discovery well in the FL shale gas field, was selected as a known well, and according to the Young’s modulus and Poisson’s ratio parameters of the shale reservoir section obtained after cross-dipole array acoustic logging processing of known wells, Perform linear regression analysis with conventional logging sonic time difference △T and lithological density ρb values ​​at the same depth to obtain empirical parameters Ay=-0.0414, By=14.38 in Young's modulus area and Ap=-0.00076 in Poisson's ratio area , Bp=0.38969, Cp=-0.61858.

[0054...

example 2

[0071] Example 2. Well B in JN gas field

[0072] The logging evaluation of the 620.0-645.0m Dongyuemiao section of Well B in the JN gas field is a shale gas layer with a thickness of 25m. The results of the invention are used to provide Young's modulus and Poisson's ratio parameters for sidetracking horizontal well fracturing.

[0073] 1. Acquisition of regional experience parameters

[0074] Well J1 in the JN gas field was selected as a known well, and according to the Young’s modulus and Poisson’s ratio parameters of the shale reservoir section obtained after the cross-dipole array acoustic logging processing of the known well, they were compared with the conventional logging acoustic logging parameters at the same depth. Time difference △T and lithological density ρb values ​​were analyzed by linear regression, and Young’s modulus area empirical parameters Ay=-0.0558, By=14.61, and Poisson’s ratio area empirical parameters Ap=0.00095, Bp=0.12490, Cp=-0.28461 were obtained....

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Abstract

The invention relates to a shale reservoir stratum Young modulus and Poisson's ratio obtaining method based on conventional logging data. The method comprises the steps that known logging data are obtained, and continuous evaluation is carried out according to the step size; the Young modulus and Poisson's ratio parameters of a shale reservoir stratum segment are obtained through processing; the Young modulus regional experience parameters Ay and By are determined, the Poisson's ratio regional experience parameters Ap, Bp and Cp are determined, the conventional logging data of a well to be evaluated are obtained, and continuous evaluation is carried out according to the step size; according to the formula, YMOD=Ay*delta T+By, and POIS+Ap*delta T+Bp*rho b+Cp, the shale reservoir stratum YMOD and the shale reservoir stratum POIS are obtained; according to user needs, the Young modulus and Poisson's ratio evaluation values of the target stratum segment of the well to be evaluated or a shale bed segment rock mechanical parameter processing result map is output. The method is applied to 36 shale gas wells of the Jiannan gas field in the Mid-Yangtze region, shale gas fields in the Fuling District and the west Xiang-E region, the obtained Young modulus and Poisson's ratio are closer to an obtained logging value, and the error is smaller than 10 percent.

Description

technical field [0001] The invention relates to a method for acquiring Young's modulus and Poisson's ratio of shale reservoirs based on conventional well logging data, which mainly provides key evaluation parameters for fracturing of shale reservoirs. Background technique [0002] Shale oil and gas is a new type of unconventional energy. Its exploration and development in China is still in its infancy. Its exploitation process is complicated, and the reservoir needs staged fracturing. The effect of the transformation directly affects the production capacity. During the fracturing process of shale reservoirs, accurate rock mechanical parameters such as Young's modulus and Poisson's ratio are needed as a reference. [0003] The traditional calculation method of Young's modulus and Poisson's ratio is to use array acoustic wave, cross dipole acoustic wave and other special logging data calculation method, which requires special project logging of cross dipole array acoustic wave...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B47/00E21B43/26
Inventor 张建平冯爱国任元赵红燕石文睿田芳石元会
Owner LOGGING CO SINOPEC OILFIELD SERVICE JIANGHAN CORP
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