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Recognition method of deep shear wave reflection imaging of side-hole faults

An identification method, deep shear wave technology, applied in seismology for well logging, electric/magnetic detection for well logging, seismology, etc., to achieve slow attenuation, large lateral detection depth, and strong reflection energy Effect

Active Publication Date: 2018-06-29
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the difficult problem of how to accurately identify reflectors by using deep shear wave reflection imaging; solves the difficult problem of how to comprehensively identify faults by combining multiple logging data or seismic data; solves the difficult problem of how to determine the occurrence of faults

Method used

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  • Recognition method of deep shear wave reflection imaging of side-hole faults
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  • Recognition method of deep shear wave reflection imaging of side-hole faults

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Embodiment 1

[0032] A method for identifying deep shear wave reflection imaging of faults next to wells, including: interpreting and evaluating the processing results of deep shear wave reflection imaging, identifying reflectors, judging whether the reflectors are faults, and determining the orientation, dip and inclination of the faults passing through the well, Then compare with the seismic data to determine the development of faults near the well.

[0033] Identifying reflectors includes the following steps:

[0034] a1. Analyze the deep shear wave reflection image, find the strong reflection energy under the weak noise background, and judge whether the strong energy on the section is a real reflector;

[0035] a2. Azimuth imaging is carried out at set angle intervals to obtain deep shear wave reflection imaging maps in different azimuths. If the reflection signal of the reflector is only visible within a certain azimuth range on the imaging map, it is judged as a real reflector; If th...

Embodiment 2

[0049] A deep shear wave reflection imaging identification method for side-hole faults, comprising:

[0050] 1. Using deep shear wave reflection imaging to identify reflectors

[0051] The first step: analyze the deep shear wave reflection image, find the strong reflection energy under the weak noise background, and judge whether the strong energy on the section is a real reflector. The basis for judging is that the reflection characteristics of the real reflector must exist on the reflected wave imaging section and the corresponding up-going and down-going wave imaging sections.

[0052] The second step: carry out azimuth imaging at a certain angular interval to obtain deep shear wave reflection imaging maps in different azimuths. If the reflection signal of the reflector is only visible within a certain azimuth range on the imaging map, it is judged as a real reflector; The reflection signal of the reflector can be seen on all azimuth imaging maps, which is caused by noise....

Embodiment 3

[0069] figure 1 It is a deep shear wave reflection imaging map of a well in the south-north and east-west orientations. The first and second traces in the figure are conventional curve traces; the third and seventh traces are depth values; the fourth and sixth traces are south-north orientations The up-going and down-going reflected wave profiles are displayed in waveform diagrams; the fifth track is the south-north bit-depth shear wave reflection imaging profile, displayed in variable density; the eighth, ninth, and tenth tracks are respectively east-west bit-depth shear waves Reflection imaging diagram and corresponding up-going and down-going wave reflection profiles. In the X075m-X175m section, there is a strong reflection energy on the South-North and East-West deep shear wave reflection imaging sections and the upgoing wave section, which meets the reflector characteristics. It is worth noting that the arrow pointing to the left in the figure is the mirror image of this...

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Abstract

The invention discloses a near-well fault deep transverse wave reflection imaging recognition method. The method includes: explaining and evaluating a deep transverse wave reflection imaging processing result, recognizing a reflector, determining whether the reflector is a fault, determining the orientation, the inclination angle and the tendency of a through-well fault, comparing above parameters with seismic data, and determining the development condition of a near-well fault. According to the method, the problems of accurate recognition of the reflector by employing deep transverse wave reflection imaging, comprehensive recognition of the fault with the combination of a lot of logging data or seismic data, and determination of attitude of the fault are solved.

Description

technical field [0001] The invention relates to a recognition method of deep shear wave reflection imaging of faults beside a well, which is suitable for the recognition of faults beside a well and belongs to the technical field of well logging interpretation. Background technique [0002] Reflected acoustic wave remote detection and imaging technology is one of the hot spots in acoustic logging research in recent years. There are two main methods: longitudinal wave reflection imaging and deep shear wave reflection imaging. The sound field reflected by the geological body is imaged, and the radial detection depth of the logging is extended from the vicinity of the borehole wall to tens of meters beside the borehole. P-wave reflection imaging uses the P-wave reflection wave and its converted wave extracted from array acoustic full-wave logging data for imaging. The frequency of the sound source is high and the detection depth is shallow, so the orientation of the reflector ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/40G01V3/34
CPCG01V1/40G01V3/34G01V2210/65
Inventor 罗利刘海军毛英雄刘航
Owner BC P INC CHINA NAT PETROLEUM CORP