A Regression-Fractal Interpolation Method for Reversing Log Shear Wave Time Difference

A technology of shear wave time difference and fractal interpolation, which is used in earthwork drilling, wellbore/well components, geophysical measurement, etc. It can solve the problems affecting the accuracy of rock mechanical parameter calculation, weakening the difference of longitudinal and shear waves, etc., and achieve high practical value. , the effect of low prediction accuracy

Active Publication Date: 2020-11-24
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

Traditional shear wave velocity calculation methods, such as multiple regression method, matrix modulus method, and Xu-White model method, all weaken the difference between compressional and shear waves more or less, because when converting between different parameters, it often requires Curve fitting affects the accuracy of later calculation of rock mechanics parameters

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  • A Regression-Fractal Interpolation Method for Reversing Log Shear Wave Time Difference
  • A Regression-Fractal Interpolation Method for Reversing Log Shear Wave Time Difference
  • A Regression-Fractal Interpolation Method for Reversing Log Shear Wave Time Difference

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specific Embodiment approach

[0030] The patent of the present invention takes the Y285 block of Huaqing Oilfield as an example to illustrate the specific implementation project of the present invention. Huaqing Oilfield is located in Huachi County, Gansu Province, with an area of ​​about 300 square kilometers. It belongs to the loess plateau landform. The surface is covered by Quaternary loess with a thickness of 100-200m. In the deep valley cut by the river, exposed rocks can be seen. The ground elevation is 1350-1660m, and the relative height difference is about 310m. Belongs to the southern part of the northern Shaanxi slope in the Ordos Basin, a local uplift formed by differential compaction, generally a gentle west-dipping monocline, with east-west low-amplitude row-like nose-shaped uplifts developed on the monocline background; it belongs to lithologic oil reservoirs, deltas In frontal lake bottom slump turbidite fan sedimentary system, the distribution direction of sand bodies is generally northea...

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Abstract

The invention relates to the field of oil and gas field exploration and development and mineral product evaluation and prediction, in particular to a method for inverting a logging shear wave time difference through a regression-fractal interpolation method. The method comprises the following steps: stablishing a research area and a research position stratigraphic framework through small-horizon comparison; establishing a shear wave time difference prediction preliminary model through multiple regression by utilizing a conventional logging curve; performing shear wave time difference two-dimensional fractal interpolation logging point circulation and shear wave time difference two-dimensional fractal interpolation interval circulation; and finally determining a shear wave prediction modelin a layered manner. According to the method, a method combining multiple regression and two-dimensional fractal interpolation is adopted, an accurate shear wave time difference prediction method is established, and a prediction result has certain reference significance in multiple aspects of shear wave time difference inversion, rock dynamic mechanical parameter calculation, geomechanical modeling and the like.

Description

technical field [0001] The invention relates to the fields of oil and gas field exploration and development, and mineral evaluation and prediction, in particular to a regression-fractal interpolation method for inversion of well logging shear wave time difference. Background technique [0002] The rock triaxial mechanics experiment directly simulates the real three-dimensional stress environment underground, and the measurement accuracy is high. However, due to the influence of the number and scale of sampling points, it is difficult to reflect the combination pattern and development degree of macroscopic natural fractures. Using logging data to calculate rock dynamic mechanical parameters can fully consider the vertical continuity of rock mechanical parameters, and the relevant formulas are as follows: [0003] [0004] [0005] [0006] In formula (1)~(3), E d is the dynamic Young's modulus of the rock, MPa; μ d is the dynamic Poisson’s ratio of the rock, dimens...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V11/00E21B49/00
CPCE21B49/00G01V11/00
Inventor 刘敬寿吴孔友刘煜磊张冠杰盛受政崔立杰
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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