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A method and system for identifying and extracting periodic fluctuations in sedimentary strata

A periodic and wave equation technology, applied in the field of geophysical exploration, can solve problems such as difficulty and complex operation, and achieve the effect of easy operation and practical problem solving.

Active Publication Date: 2019-08-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of complex operation and high difficulty in the existing periodic fluctuation identification and extraction technology, the purpose of the present invention is to propose a simple, easy to operate, low operational difficulty and high efficiency periodic fluctuation identification and extraction method using wavelet analysis technology. Extraction method and system

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  • A method and system for identifying and extracting periodic fluctuations in sedimentary strata
  • A method and system for identifying and extracting periodic fluctuations in sedimentary strata
  • A method and system for identifying and extracting periodic fluctuations in sedimentary strata

Examples

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Embodiment 1

[0051] Such as figure 1 As shown, it is a flow chart of the method for identifying and extracting periodic fluctuations in sedimentary strata in this embodiment. The method in this implementation includes the following steps:

[0052] S10: establishing a formation deposition rate curve;

[0053] S20: performing discrete wavelet analysis on the stratum deposition rate curve in step S10 to obtain analysis results;

[0054] S30: Find a curve with a stable period in the analysis result obtained in step S20, and summarize the corresponding mathematical equation;

[0055]S40: Perform signal reconstruction on the curves obtained in step S30, and the curves obtained at this time are comprehensive deposition fluctuation curves under the influence of corresponding periodic fluctuations;

[0056] S50: Establish a corresponding wave equation according to the wave curve obtained in step S40;

[0057] S60: Predict the sedimentation fluctuation curve of the strata not reached by drilling ...

Embodiment 2

[0059] In this example, the specific application of the method in Example 1 is specifically for the article "Cenozoic Fluctuation Process in Qaidam Basin and Its Relationship with Oil and Gas" (Jin Zhijun, Li Jingchang, Tang Liangjie, etc. Cenozoic Fluctuation in Qaidam Basin process and its relationship with oil and gas [J]. Acta Geologica Sinica, 2006, 80 (3): 359-365.) The deposition rate histogram used in the deposition rate curve obtained by discrete sampling, using the method proposed by the present invention to carry out periodic wave identification and extraction can be verified by comparing and verifying the recognition results obtained by using the present invention and the results obtained by applying the sliding filter method in the article. The specific process and the comparison of the results are described in detail in this embodiment.

[0060] Step S10: establishing a stratum deposition rate curve;

[0061] The specific establishment method of the layer deposi...

Embodiment 3

[0078] In order to further verify the effectiveness of the method in the present invention, this embodiment applies the method in the present invention to the article "Tarim Basin High Frequency Wave Identification and Its Significance" (Fan Guozhang, Jin Zhijun, Liu Guochen, etc. Tarim Basin High Frequency Wave Identification and Its significance [J]. Acta Sedimentum Sinica, 2001, 19 (2): 245-248.) The deposition rate curve used in the analysis. The specific method is the same as that of the second embodiment, and will not be repeated here. In this example, if Figure 5 Shown is a comparison chart of the analysis results obtained by applying the method in the present invention and the analysis results obtained by applying the sliding window filtering method in the article. Such as Figure 5 As shown, curve A' and curve B' are fluctuation curves obtained by applying the method of the present invention; curve A and curve B are fluctuation curves obtained by applying the slidi...

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Abstract

The invention discloses a method and system for identifying and extracting periodic fluctuations in a sedimentary stratum. The method comprises the steps of firstly establishing a sedimentation rate curve of the stratum, then building a wavelet basis function to perform discrete wavelet transform on the sedimentation rate curve, searching a curve with a stable period in detail components of wavelet decomposition, then recovering the sedimentation rate curve influenced by the periodic fluctuations according to a reconstruction method of the discrete wavelet transform, finally writing a fluctuation equation of the sedimentation fluctuation curve according to a signal reconstruction formula of the discrete wavelet transform, calculating a sedimentation fluctuation curve of an undrilled stratum in well drilling by applying the fluctuation equation, and predicting the geological condition of the undrilled stratum according to the sedimentation rate changes reflected by the fluctuation curve. The method and system in the invention expand a technical method for fluctuation analysis, periodic waves can be quickly decomposed and extracted from the sedimentation rate curve, the operation issimple and easy, the popularization and application of fluctuation analysis and research in the practical work are facilitated, and practical problems in production are solved.

Description

technical field [0001] The invention relates to the technical field of geophysical exploration, in particular to a method and system for identifying and extracting periodic fluctuations in sedimentary strata related to basin fluctuation analysis. Background technique [0002] Sedimentary basin fluctuation analysis is a method to decompose the regular fluctuation process from some periodic, quasi-periodic and non-periodic geological phenomena and establish a wave equation to realize quantitative research on geological processes. Fluctuation cycle identification is a key technology in the analysis of basin fluctuations. Currently, the commonly used method is the sliding window filtering method, that is, using a sliding window with varying scales to perform sliding filtering analysis on the sedimentation rate curve, and identifying and extracting periodicity based on the analysis results. volatility curve. [0003] Because the sedimentary evolution process of the basin is cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30
Inventor 吴宝年金之钧
Owner CHINA PETROLEUM & CHEM CORP