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An overpressure interface identification method, device, equipment and storage medium

An identification method and interface technology, which can be used in measurement devices, seismology, instruments, etc., can solve the problems of quantitative prediction uncertainty of overpressure interface and difficult to obtain accurate seismic velocity, and achieve the effect of improving prediction accuracy.

Active Publication Date: 2021-09-24
SHANGHAI BRANCH CHINA OILFIELD SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, as the quality of mid-to-deep seismic data decreases, it is difficult to obtain accurate seismic velocity, so there is uncertainty in the quantitative prediction of the overpressure interface

Method used

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  • An overpressure interface identification method, device, equipment and storage medium
  • An overpressure interface identification method, device, equipment and storage medium
  • An overpressure interface identification method, device, equipment and storage medium

Examples

Experimental program
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Embodiment 1

[0026] figure 1 It is a schematic flow chart of an overpressure interface identification method provided by Embodiment 1 of the present invention. This embodiment is applicable to the situation of identifying a super interface through seismic data, and the method can be executed by an overpressure interface identification device, wherein the device can be Implemented in software and / or hardware and generally integrated in the terminal. For details, see figure 1 As shown, the method may include the following steps:

[0027] S110, determine the coal-measure strata data in the seismic section map of the current area, and determine the coal-measure strata top surface, the coal-measure strata bottom surface and at least one between the coal-measure strata top surface and the coal-measure strata bottom surface of the coal-measure strata data events.

[0028] Wherein, the current area may be ocean, land, or other areas. Generally, for the coal-measure strata area, the formation o...

Embodiment 2

[0037] figure 2 It is a schematic flowchart of a method for identifying an overpressure interface provided in Embodiment 2 of the present invention. The technical solution of this embodiment is refined on the basis of the above embodiments. Optionally, the determining the seismic phase of the overpressure zone of the current regional seismic profile according to the amplitude data includes: for the current event , comparing the amplitude data of the current event with a first preset amplitude threshold, and comparing the amplitude data of three events adjacent to the current event toward the top surface of the coal-measure formation with the first preset amplitude data respectively. Two preset amplitude thresholds are compared; if the amplitude data of the current event is smaller than the first preset amplitude threshold, and the absolute values ​​of the amplitude data of the three events adjacent to the current event are all smaller than the For the second preset amplitude...

Embodiment 3

[0050] Figure 4 It is a schematic flowchart of an overpressure interface identification method provided by Embodiment 3 of the present invention. The technical solution of this embodiment adds new steps on the basis of the above embodiments, and optionally further includes: acquiring multiple sets of drilling data in the current area, and determining the current area respectively according to each set of drilling data The pressure coefficient curve; wherein, the pressure coefficient curve includes the drilling depth and drilling pressure value of the current area; the multiple pressure values ​​of the multiple pressure coefficient curves in the same depth interval are respectively compared with the overpressure interface Perform matching; obtain a comparison result between the matching quantity and a set threshold, and adjust the depth range of the depth interval according to the comparison result, so as to update the area of ​​the overpressure interface in the adjusted depth...

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Abstract

The embodiment of the invention discloses an overpressure interface identification method, device, equipment and storage medium. By determining the coal-measure strata data in the seismic section map of the current area, and determining the coal-measure strata top surface, the coal-measure strata bottom surface of the coal-measure strata data, and at least One event, obtain the amplitude data of each event, determine the overpressure zone seismic phase of the current regional seismic profile according to the amplitude data, and determine the overpressure interface of the current regional seismic profile according to the overpressure zone seismic phase, which solves the problem of the existing technology As the quality of deep seismic data decreases, the seismic velocity is more difficult to be accurate. The purpose of determining the overpressure interface by determining the coal-measure stratum area and the reflection characteristics of the seismic data in the coal-measure strata area is to realize the improvement of overpressure interface prediction. The effect of accuracy.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of formation pore pressure prediction, and in particular to a method, device, equipment and storage medium for identifying an overpressure interface. Background technique [0002] Overpressure exists in many basins around the world. Normal pressure means that the pore pressure gradient range of the formation is greater than or equal to 1.0g / cm3 and less than 1.2g / cm3, and overpressure means that the pore pressure gradient of the formation is greater than 1.2g / cm3. Usually, the depth position where the formation pore pressure gradient is equal to 1.2g / cm3 is called the overpressure interface. [0003] In recent years, the conventional overpressure interface prediction method is based on the characteristics that the overpressure formation decreases as the formation deepens, and the Eaton method based on the cause of undercompaction and the Bowers method based on the cause of fluid ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30G01V1/28
CPCG01V1/28G01V1/306
Inventor 赵军刘云高伟中姜勇李键阮建新王晓培
Owner SHANGHAI BRANCH CHINA OILFIELD SERVICES