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A method for identifying micro-amplitude folds in seismic data

A seismic data and identification method technology, applied in seismology, seismic signal processing, geophysical measurement, etc., can solve the problems of lack of stress characteristic information, no seismic wave dynamics information, and low accuracy of micro fold identification

Active Publication Date: 2021-05-18
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, in the prior art, the wrinkle recognition can also be obtained by calculating the curvature, which is a common practice. When obtained, it usually only contains curvature information, lacks information on fold properties such as anticlines or synclines and their representative stress characteristics, and does not include seismic wave dynamics information containing reservoir characteristics such as amplitude
As a result, the accuracy of micro-fold recognition is not high and the efficiency is low

Method used

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  • A method for identifying micro-amplitude folds in seismic data
  • A method for identifying micro-amplitude folds in seismic data
  • A method for identifying micro-amplitude folds in seismic data

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Experimental program
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Embodiment 1

[0034] As a preferred embodiment of the present invention, it discloses a method for identifying micro-folds in seismic data, the steps of which are as follows:

[0035] a. High resolution processing: processing conventional lower resolution seismic data into high resolution data;

[0036] b. Fine horizon correlation: Accurately pick up seismic horizons according to the usual seismic horizon correlation technology;

[0037] c. Automatic identification of folds: calculate the curvature of the formation along the seismic horizon, find folds, and judge the positive or negative of the curvature at the same time;

[0038] d. Judging the nature of folds: judging whether it is an anticline or a syncline according to the positive and negative changes of the curvature;

[0039] e. Extract the amplitude difference: calculate the amplitude difference in each direction within the scope of the target layer with the center of the slight fold;

[0040] f. Calculation of slight wrinkle amou...

Embodiment 2

[0046] refer to figure 1 , as the best implementation mode of the present invention, its steps are:

[0047]a. High-resolution processing: process conventional lower-resolution seismic data into high-resolution data; if the resolution of seismic data is already high, this step can be ignored. The high-resolution processing method is arbitrary, but the resolution There should be a significant improvement.

[0048] b. Fine horizon correlation: Accurately pick seismic horizons according to the usual seismic horizon correlation technology; the picked seismic horizons should be on the same reflection feature point or geological interface, and the reflection feature points are peaks or troughs.

[0049] c. Automatic identification of folds: calculate the curvature of the formation along the seismic horizon, find folds, and judge the positive or negative of the curvature at the same time;

[0050] d. Judging the nature of folds: Judging whether it is an anticline or a syncline acco...

Embodiment 3

[0055] Specific application examples: Refer to 2 and 3 to clarify the principle of the specific calculation method.

[0056] figure 2 Contains an anticline and a syncline, just take the anticline as an example. The stratum center is determined, and the stratum thickness (time window length when the seismic section is in the time domain) is the range between the top and bottom boundaries of the stratum. According to the horizon data picked up by the formation center, the curvature can be calculated, folds can be found, and the positive and negative of the curvature (dorsal and syncline properties) can be obtained to determine the core of the fold and the seismic trace where the fold center is located—the central trace, and then from the upper Calculate the amplitude difference on both sides of the center track point by point. In actual calculation, also according to image 3 Calculate the amplitude difference between multiple traces in each direction of the central trace, a...

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Abstract

The invention discloses a method for identifying micro-amplitude folds of seismic data, which relates to the technical field of seismic data processing for oil and gas field exploration and development. The steps are: a. High resolution processing: processing conventional lower resolution seismic data into high resolution data ;b. Fine horizon correlation: Accurately pick up seismic horizons according to the usual seismic horizon correlation technology; c. Automatic fold recognition: calculate formation curvature along seismic horizons, find folds, and judge the positive or negative of curvature at the same time; d, Folds Judgment of nature: judging whether it is an anticline or a syncline according to the positive and negative changes of curvature; e. Extracting amplitude difference: calculating the amplitude difference in each direction within the scope of the target layer with the center of the slight fold; f. Calculating the amount of slight fold: according to the positive and negative sign of the curvature , curvature size and amplitude difference value three parameters, comprehensively calculate the slight wrinkle amount. After adopting this method, the recognition accuracy is significantly improved, and the recognition efficiency is high.

Description

technical field [0001] The invention relates to the technical field of seismic data processing for oil and gas field exploration and development, in particular to a method for identifying micro-folds of seismic data. Background technique [0002] With the increasingly wide application of horizontal well exploration and development technology, some new problems arise, such as difficulty in well trajectory control, frequent lost circulation and casing change, especially casing change, which means that the casing that is lowered into the well is deformed and damaged , frequently occurs during the casing operation of shale gas horizontal wells, causing huge economic losses. [0003] The fundamental geological reason for the occurrence of casing deformation is that the stress applied to the casing is unbalanced and the casing is damaged. The direct geological reason is that sudden changes in geological factors may lead to casing deformation, such as formation distortion, litholog...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/64
Inventor 吴大奎吴宗蔚徐明华
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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