Method for picking up boundary with abnormal gravity by using normalized derivative model method

A gravity anomaly and normalization technology, applied in seismic signal processing and other directions, can solve problems such as insufficient noise suppression, noise amplification, and inability to identify small-scale fractures, and achieve the effect of improving the accuracy of geological interpretation

Inactive Publication Date: 2012-05-23
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0003] These methods are either insensitive to weak signals and will miss some small-scale fractures; or although the weak signals are enhanced, the noise is amplified at the same time, and the suppression of the noise is not in place, and small-scale fractures cannot be identified

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  • Method for picking up boundary with abnormal gravity by using normalized derivative model method
  • Method for picking up boundary with abnormal gravity by using normalized derivative model method
  • Method for picking up boundary with abnormal gravity by using normalized derivative model method

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Embodiment Construction

[0030] The present invention will be described in detail below in conjunction with the drawings.

[0031] The invention highlights and strengthens the change of the gravity gradient by calculating the Bouguer gravity anomaly (g), thereby realizing the identification and extraction of the gravity anomaly boundary information.

[0032] The main technical steps are:

[0033] 1) Collect the gravity data of the target area, and use low-pass filtering, median filtering or small-scale upward continuation technology to remove the weak information produced by shallow and near-surface heterogeneous bodies in the Bouguer gravity anomaly (g);

[0034] 2) Calculate the derivative in the X-axis direction for the Bouguer gravity anomaly (g) after denoising and information enhancement and Y-direction derivative Then find the horizontal gradient modulus Z(x, y);

[0035] 3) Use the vertical second derivative method to calculate the second derivative Z(x, y) in the Z-axis direction for the...

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Abstract

The invention discloses a method for picking up a boundary with abnormal gravity by using a normalized derivative model method which utilizes gravimetric and magnetic data to interpret breakage and other geotectonic boundaries in petroleum and solid mineral exploration. The method comprises steps of: eliminating weak information generated by shallow and near-surface heterogeneous bodies in bouguer gravity anomaly of gravity data by using a low-pass filter; respectively getting a derivative in X axis direction and a derivative in Y axis direction to obtain a horizontal gradient model; determining a coherent signal to obtain curvature properties, the normalized derivative model and a contour map; and determining the boundary with abnormal gravity to be picked up according to a ligature of maximum values of the anomaly. According to the anomaly information obtained by the invention, not only the width of large-scale anomaly is narrowed and thinned, but also the weak anomaly in small scale can be effectively highlighted.

Description

technical field [0001] The invention relates to a method for picking up gravity anomaly boundaries using gravity and magnetic data to interpret geological structure boundaries such as fractures in the exploration of petroleum and solid minerals. Background technique [0002] The use of gravity data to identify fractures is mainly based on the linear step band of the Bouguer gravity anomaly, the distortion of the anomaly, and the zoning characteristics of the anomaly. In recent years, the position of the maximum value of the total gradient of the gravity anomaly level has been widely used to identify the location of the fracture. In addition to the above-mentioned conventional methods, there are other methods for identifying faults. Wang Yichang proposed to use horizontal second derivatives to explain reverse faults "Petroleum Geophysical Exploration" (1989.2); Zhang Fengqin et al. proposed to use the improved gravity normalized total gradient and phase method to identify fa...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/36
Inventor 宋景明邓国军
Owner BC P INC CHINA NAT PETROLEUM CORP
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