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Crack prediction method and device

A technology of fracture prediction and longitudinal line, which is applied in earthwork drilling, wellbore/well components, seismic signal processing, etc. It can solve the problems of high cost, low S-wave signal-to-noise ratio, troublesome converted wave processing, etc. The effect of improving the rate and improving the accuracy

Active Publication Date: 2010-12-08
PETROCHINA CO LTD
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  • Application Information

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Problems solved by technology

[0007] In the course of the inventor's realization of the present invention, the inventor found that the defects of the above method are: when shear waves, converted waves, and multi-components are used to detect cracks, the shear wave SNR is low, the frequency is low, the cost of multi-wave acquisition and processing is too high, and the converted wave It is cumbersome to process; when multi-directional VSP is used to detect cracks, the collection and processing are cumbersome, costly, and the scope of action is limited;
The disadvantage of this post-stack technology is that the post-stack data used has no azimuth information and offset information. In theory, conventional exploration technology lacks the theoretical basis for anisotropy research.

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Embodiment 1

[0050] An embodiment of the present invention provides a fracture prediction method, such as figure 1 As shown, the method includes:

[0051]Step 101, acquiring pre-stack common-centre jogging gather seismic data and relevant parameters for fracture prediction, the relevant parameters include: longitudinal survey line bin size, transverse survey line bin size and picking time window;

[0052] Step 102: Obtain the target layer according to the seismic data of the pre-stack common-center jogging calibration gather, and generate corresponding index data; the index data includes longitudinal line number, cross line number, start track number, end track number, and coverage times , the maximum number of coverage;

[0053] Step 103, obtaining post-stack seismic data according to the pre-stack seismic data of the common center jogging calibration gather, and using the post-stack seismic data to perform seismic horizon interpretation to generate horizon data;

[0054] Step 104, usin...

Embodiment 2

[0093] The embodiment of the present invention provides a crack prediction method, which is further described on the basis of Embodiment 1, as follows figure 2 As shown, the method includes:

[0094] Step 201, acquiring pre-stack common-center jogging calibration gather seismic data and related parameters for fracture prediction, the related parameters include: longitudinal survey line bin size, transverse survey line bin size and picking time window;

[0095] In this embodiment, the relevant parameters may also include: longitudinal survey line increment, transverse survey line increment, minimum offset, maximum offset, offset bin size, azimuth bin size and smoothing parameters ;

[0096] Among them, the longitudinal survey line increment and transverse survey line increment can be used to control the workload, control the number of inline lines and crossline lines; the minimum offset and maximum offset can be used to control the range of pre-stack data used; offset The di...

Embodiment 3

[0127] An embodiment of the present invention provides a crack prediction device, such as Figure 15 As shown, the device includes: a data acquisition unit 1501, a first generation unit 1502, a second generation unit 1503, a third generation unit 1504, an information acquisition unit 1505, an azimuth calculation unit 1506, an amplitude acquisition unit 1507 and a fitting unit 1508 ;in,

[0128] The data acquisition unit 1501 is used to acquire the seismic data of the pre-stack common-center jogging calibration gather of the target layer and related parameters for fracture prediction, and the related parameters include: longitudinal survey line bin size, transverse survey line bin size and picking time window ;

[0129] The first generation unit 1502 is used to acquire the target layer according to the seismic data of the pre-stack common-center jogging trace set, and generate corresponding index data and layer data; the index data includes longitudinal line number, transverse...

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Abstract

The embodiment of the invention provides crack prediction method and device. The method comprises the following steps of: acquiring prestack common midpoint dynamic correction gathering seismic data and related parameters for carrying out crack prediction; generating corresponding index data according to the prestack common midpoint dynamic correction gathering seismic data and acquiring horizon data according to post-stack seismic data interpretation; generating conventional broad azimuth prestack common midpoint dynamic correction gathering data from the prestack common midpoint dynamic correction gathering seismic data according to conventional narrow azimuth prestack common midpoint dynamic correction gathering data; acquiring the relevant trace header information of each seismic channel according to the conventional wide azimuth prestack common midpoint dynamic correction gathering data; calculating the azimuth angle of each seismic channel by utilizing the acquired trace header information; acquiring the reflection amplitude of each seismic channel by utilizing a pickup time window by taking a destination layer as a pickup center; and carrying out elliptical fitting by utilizing the acquired azimuth angle and the acquired reflection amplitude so as to determine the crack direction and the crack density. The embodiment can improve the prediction precision of a crack reservoir stratum, can not only realize the three-dimensional prediction on the crack reservoir stratum, but also carry out the two-dimensional prediction, thereby improving the success ratio of a prospecting well and a drilling well.

Description

technical field [0001] The invention relates to crack prediction technology, in particular to a crack prediction method and device. Background technique [0002] The formations that preserve oil and natural gas are called oil and gas reservoirs, and most of them are formations with a certain porosity. Among them, the reservoirs containing a large number of fractures or mainly fractures are fractured reservoirs, such as mudstone fractured reservoirs and sandstone fractured reservoirs. , Carbonate fractured reservoirs, volcanic rock fractured reservoirs, etc., the oil and gas reservoirs formed are fractured oil and gas reservoirs. [0003] The purpose of oil exploration is to comprehensively use geophysical exploration methods, earth gravity / magnetic exploration methods, geophysical logging exploration methods, geological exploration methods, and geochemical exploration methods to find underground reservoirs that store oil and natural gas. This is Reservoir prediction in a br...

Claims

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Application Information

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IPC IPC(8): G01V1/28G01V1/36E21B49/00
Inventor 刘军迎杨午阳高建虎雍学善李三家王恩利
Owner PETROCHINA CO LTD
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