CN-121978764-A - Natural potential differential measurement integral inversion method, device, equipment and medium

CN121978764ACN 121978764 ACN121978764 ACN 121978764ACN-121978764-A

Abstract

The application discloses a natural potential difference measurement integral inversion method, device, equipment and medium, which relate to the technical field of oilfield development logging and comprise the steps of obtaining a fixed electrode distance potential difference measurement curve of a well to be logged, integrating the fixed electrode distance potential difference measurement curve to obtain a natural potential measurement curve, folding respective natural potential values in the natural potential measurement curve according to a preset period to obtain a periodic analysis chart, carrying out data remainder extraction, data deletion and correction curve drawing on the periodic analysis chart to obtain a correction curve, correcting a two-dimensional array storing the natural potential values in the periodic analysis chart by using the correction curve, generating a continuous natural potential curve based on the corrected two-dimensional array, taking the continuous natural potential curve as a natural potential difference measurement integral inversion result of the well to be logged, and realizing natural potential difference measurement integral inversion even without a stable stratum, thereby improving the accuracy of natural potential difference measurement integral inversion.

Inventors

LI GUOFENG
LI ZHONGWEI
ZHENG LIANZHU
ZHANG YAWEN
LIU ZHITAI

Assignees

中国石油化工集团有限公司
中石化石油工程技术服务股份有限公司
中石化经纬有限公司
中石化经纬有限公司华东测控分公司

Dates

Publication Date: 20260505
Application Date: 20241025

Claims (10)

1. The natural potential differential measurement integral inversion method is characterized by comprising the following steps of: Acquiring a potential difference measurement curve of a fixed electrode distance to be logged, which varies with the depth of a well bore; Integrating the potential difference measurement curve of the fixed electrode distance to obtain a natural potential measurement curve, and folding the respective natural potential values in the natural potential measurement curve according to a preset period to obtain a periodic analysis chart; Performing data remainder, data deletion and correction curve drawing on the periodic analysis chart to obtain a correction curve, and correcting a two-dimensional array for storing the natural potential values in the periodic analysis chart by using the correction curve to obtain a corrected two-dimensional array; and generating a continuous natural potential curve based on the corrected two-dimensional array, and taking the continuous natural potential curve as a natural potential differential measurement integral inversion result of the well to be measured.
2. The method of claim 1, wherein the obtaining a fixed electrode distance potential difference measurement profile as a function of borehole depth for a well to be logged comprises: And measuring the well to be measured by using a differential measurement logging instrument so as to directly obtain the fixed electrode distance potential difference measurement curve of the well to be measured, which changes along with the depth of the well bore, from the differential measurement logging instrument.
3. The method of claim 1, wherein integrating the fixed electrode distance potential difference measurement curve to obtain a natural potential measurement curve comprises: Integrating all potential points in the potential difference measurement curve of the fixed electrode distance by using a natural potential value calculation formula to obtain a natural potential measurement curve, wherein the natural potential value calculation formula is as follows: ; Wherein, the Is the natural potential value of the m-th potential point, L is the electrode distance, E (m) is the potential difference at the mth potential point, which is the natural potential value of the point at the electrode distance length from the mth potential point.
4. The method of inverting the natural potential difference measurement integral of claim 1, wherein the folding the respective natural potential values in the natural potential measurement curve according to a predetermined period comprises: Folding the respective natural potential values in the natural potential measurement curve according to a preset period by using a two-dimensional array calculation formula, wherein the two-dimensional array calculation formula is as follows: ; Wherein, the Is a two-dimensional array of abscissa values, For the i-th period, T is the period, And the natural potential value corresponding to the abscissa of the two-dimensional array in the ith period.
5. The method of claim 1, wherein the performing data interpolation, data deletion, and correction curve plotting on the periodic analysis map to obtain a correction curve comprises: determining total data of the two-dimensional array in the periodic analysis chart, and taking a remainder of the total data and a preset period to obtain a remainder; and deleting data from the periodic analysis graph according to the remainder, and drawing a correction curve of the periodic analysis graph after deleting the data to obtain the correction curve.
6. The method of inverting a natural potential difference measurement integral of claim 5, wherein the deleting data from the periodic analysis chart according to the remainder and the correcting curve drawing on the periodic analysis chart after deleting data to obtain a correcting curve comprises: judging whether the remainder is 0, if not, deleting the data of the two-dimensional array according to the remainder to obtain the periodicity analysis graph after deleting the data; And carrying out average value calculation on the natural potential values of all phase points in different periods in the periodic analysis chart after data deletion to obtain longitudinal average values, and drawing a correction curve by using the longitudinal average values.
7. The method of any one of claims 1 to 6, wherein the correcting the two-dimensional array in the periodic analysis chart with the correction curve to obtain the corrected two-dimensional array, generating a continuous natural potential curve based on the corrected two-dimensional array, comprises: Subtracting and correcting the two-dimensional array and the correction curve in the periodic analysis chart to obtain a corrected two-dimensional array; and expanding and splicing the corrected two-dimensional arrays to generate a continuous natural potential curve.
8. The utility model provides a natural potential difference measurement integral inversion device which characterized in that includes: The curve acquisition module is used for acquiring a fixed electrode distance potential difference measurement curve of a well to be logged, which varies with the depth of the well; The curve integration and potential value folding module is used for integrating the potential difference measurement curve of the fixed electrode distance to obtain a natural potential measurement curve, and folding the respective natural potential values in the natural potential measurement curve according to a preset period to obtain a periodic analysis chart; The correction module is used for carrying out data redundancy, data deletion and correction curve drawing on the periodic analysis chart to obtain a correction curve, and correcting a two-dimensional array for storing the natural potential values in the periodic analysis chart by using the correction curve to obtain a corrected two-dimensional array; And the natural potential curve generating module is used for generating a continuous natural potential curve based on the corrected two-dimensional array, and taking the continuous natural potential curve as a natural potential differential measurement integral inversion result to be measured.
9. An electronic device, comprising: A memory for storing a computer program; a processor for executing the computer program to implement the natural potential differential measurement integral inversion method as claimed in any one of claims 1 to 7.
10. A computer readable storage medium for storing a computer program, wherein the computer program when executed by a processor implements the natural potential differential measurement integral inversion method of any one of claims 1 to 7.

Description

Natural potential differential measurement integral inversion method, device, equipment and medium Technical Field The invention relates to the technical field of oilfield development well logging, in particular to a natural potential differential measurement integral inversion method, a device, equipment and a medium. Background With the technical upgrading of oilfield development, the development wells mostly adopt horizontal well designs, and cable transportation cannot be completed due to well conditions. At present, a horizontal well and a complex well are usually measured by adopting a direct-push type well measurement, however, a natural potential reference electrode of the direct-push type well measurement is ideally connected with the earth by utilizing a drilling tool, and in practice, because the drilling tool is old and severely corroded, a large amount of insulating screw thread oil is coated at a joint to avoid screw thread damage, so that the contact resistance of the drilling tool is unstable, and if the contact resistance is large, the situation is equivalent to that the reference electrode is only connected to an instrument shell or only connected to one or two drilling tools, the quality of a natural potential measurement curve is reduced, and the characteristics of low curve amplitude and unstable mudstone baseline are mainly reflected. From the above, how to realize the inversion of the natural potential difference measurement integral of the nonstationary stratum and improve the accuracy of the inversion of the natural potential difference measurement integral is a problem to be solved in the field. Disclosure of Invention In view of the above, the invention aims to provide a method, a device, equipment and a medium for inverting natural potential differential measurement integral, which can realize the inversion of the natural potential differential measurement integral of a non-stationary stratum and improve the accuracy of the inversion of the natural potential differential measurement integral. The specific scheme is as follows: in a first aspect, the application discloses a natural potential differential measurement integral inversion method, which comprises the following steps: Acquiring a potential difference measurement curve of a fixed electrode distance to be logged, which varies with the depth of a well bore; Integrating the potential difference measurement curve of the fixed electrode distance to obtain a natural potential measurement curve, and folding the respective natural potential values in the natural potential measurement curve according to a preset period to obtain a periodic analysis chart; Performing data remainder, data deletion and correction curve drawing on the periodic analysis chart to obtain a correction curve, and correcting a two-dimensional array for storing the natural potential values in the periodic analysis chart by using the correction curve to obtain a corrected two-dimensional array; and generating a continuous natural potential curve based on the corrected two-dimensional array, and taking the continuous natural potential curve as a natural potential differential measurement integral inversion result of the well to be measured. Optionally, the acquiring a fixed electrode distance potential difference measurement curve of the well to be logged according to the depth of the well hole includes: And measuring the well to be measured by using a differential measurement logging instrument so as to directly obtain the fixed electrode distance potential difference measurement curve of the well to be measured, which changes along with the depth of the well bore, from the differential measurement logging instrument. Optionally, the integrating the fixed electrode distance potential difference measurement curve to obtain a natural potential measurement curve includes: Integrating all potential points in the potential difference measurement curve of the fixed electrode distance by using a natural potential value calculation formula to obtain a natural potential measurement curve, wherein the natural potential value calculation formula is as follows: ; Wherein, the Is the natural potential value of the m-th potential point, L is the electrode distance,E (m) is the potential difference at the mth potential point, which is the natural potential value of the point at the electrode distance length from the mth potential point. Optionally, the folding the respective natural potential values in the natural potential measurement curve according to a preset period includes: Folding the respective natural potential values in the natural potential measurement curve according to a preset period by using a two-dimensional array calculation formula, wherein the two-dimensional array calculation formula is as follows: ; Wherein, the Is a two-dimensional array of abscissa values,For the i-th period, T is the period,And the natural potential value corresponding to the absc