Extraction Method of Formation Anisotropy Resistivity Based on Electromagnetic Logging While Drilling Data

A technique of logging data and anisotropy, applied in earthwork drilling, wellbore/well components, buildings, etc., can solve the problem that the inversion results are easily trapped in local minimum values, multi-layer model inversion parameters, Jacobian Problems such as large amount of calculation can solve the problem of real-time resistivity curve correction and improve the effect of inversion speed

Active Publication Date: 2021-03-02
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

From an optimization point of view, the real-time processing of LWD electromagnetic logging data mainly has the following three problems: 1) the multi-layer model used in the inversion calculation is slow; 2) the multi-layer model has many inversion parameters, and the Jacobian calculation 3) There are multiple local minima, and the known formation information is scarce, so the inversion results are easily trapped in local minima

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  • Extraction Method of Formation Anisotropy Resistivity Based on Electromagnetic Logging While Drilling Data
  • Extraction Method of Formation Anisotropy Resistivity Based on Electromagnetic Logging While Drilling Data
  • Extraction Method of Formation Anisotropy Resistivity Based on Electromagnetic Logging While Drilling Data

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[0046] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0047] combine figure 1 As shown, the embodiment of the present invention provides a method for extracting formation anisotropy resistivity based on electromagnetic wave logging while drilling data, which includes the following steps:

[0048] s1. Perform environmental correction on the input LWD electromagnetic wave logging curve to eliminate the influence of the borehole on the logging response.

[0049] s2. Obtain the geological structure information of the block, such as the variation range of layer thickness, resistivity and stratum inclination.

[0050] s3. Sliding window processing is performed on the logging data, and the initial complex stratigraphic model is converted into a series of stratum models after windowing, such as figure 2 shown and image 3 As shown, the original complex three-dimensional problem is simplified into a ser...

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Abstract

The invention discloses a formation anisotropic resistivity extraction method based on electromagnetic wave logging data while drilling, comprising the steps of: s1. performing environmental correction on the input electromagnetic wave logging curve while drilling; s2. acquiring block geological structure information; s3. Sliding window processing of logging data; s4. Establishing a single-interface inversion stratigraphic model; s5. Judging whether there is an inversion result of the previous sliding window, and if so, execute step s6; otherwise, execute step s8; s6. The inversion result of the previous sliding window is used as the initial value of the inversion of the current sliding window; s7. Use the nonlinear optimization algorithm to invert the electromagnetic logging data while drilling. If not, execute step s9; otherwise, execute step s8; s8. Adopt adaptive multi-initial value selection method, combined with nonlinear optimization algorithm to invert electromagnetic logging data while drilling; s9. Optimize and select multiple inversion results . The invention can provide accurate resistivity information for real-time geosteering and reservoir evaluation.

Description

technical field [0001] The invention relates to the field of petroleum exploration and development, and belongs to the category of electrical logging methods, in particular to a method for extracting formation anisotropy resistivity based on electromagnetic wave logging data while drilling. Background technique [0002] Because of its high resolution and sensitivity to anisotropic resistivity, electromagnetic logging while drilling is widely used in reservoirs with relatively clear geological structure. However, due to the influence of the formation's proximity to the formation boundary, relative dip angle and anisotropy, the apparent resistivity curves at different detection depths are seriously separated, and there are abnormal resistivity "horns", resulting in the apparent resistivity value being much greater than the true value of the formation. Therefore, accurate and real-time inversion of true formation resistivity information is one of the key issues to be solved in ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00E21B47/13
CPCE21B49/00E21B47/13
Inventor 王磊范宜仁邢涛邓少贵范卓颖
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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