Unlock instant, AI-driven research and patent intelligence for your innovation.

Calculation method of quality factor under the constraints of seismic data

A technology of quality factor and seismic data, applied in the field of data processing, to achieve the effect of flexible selection

Active Publication Date: 2017-03-08
成都晶石石油科技有限公司
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in Li Qingzhong's empirical formula method, the slope a and exponent b in the formula are fixedly selected, and the calculated Q value has a certain gap with the actual geological situation.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Calculation method of quality factor under the constraints of seismic data

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] like figure 1 As shown, the quality factor calculation method under the constraints of seismic data includes the following steps:

[0033] S1. Determine the value range and step size of slope a and exponent b. In specific applications, the step size depends on the comprehensive consideration of operation accuracy and efficiency. When the step size is small, the operation speed is fast, but the calculated The accuracy of the best a and b values ​​is high, and the final determined value of the quality factor Q is more in line with the actual geological conditions. On the contrary, when the step size is large, the calculation speed is fast, but the final calculated best a and b values ​​have low precision , the final determined value of the quality factor Q is less consistent with the actual geological conditions than the case with a small step size; therefore, the value of the step size is selected according to specific application requirements. The value intervals of a ...

Embodiment 2

[0042] On the basis of embodiment 1, the following improvements have also been made in this embodiment:

[0043] In step S1, after determining the value interval and value step of the slope a and the exponent b, it also includes the step of constructing the value space of a and b; in this embodiment, the construction method of the value space is as follows:

[0044] (1) in the value range of a, determine all value points of a according to the initial value of a (in this embodiment, the lower limit value of the value range of a) and the value step size; the value point of a is a 0 +km, where a 0 is the lower limit value of the value interval of a, m is the value step size of a, k=0,1,2,3...; a 0 +km is not greater than the upper limit of the value range of a.

[0045] (2) in the value range of b, determine all value points of b according to the initial value of b (in this embodiment, the lower limit value of the value range of b) and the value step size; the value point of b...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for calculating a quality factor under a seismic data constraint. The method comprises the following steps: 1, determining value intervals and value step lengths of a and b; 2, initializing a and b; 3, substituting a, b and P-wave interval velocity Vp into Q=aVpb to calculate a value of Q; 4, performing inverse Q filtering calculation to obtain a filtering channel set according to the calculated value of Q; 5, performing similarity analysis on the filtering channel set obtained in step 4 and a forward channel set, and recording a comparison result; 6, judging whether all value combinations are traversed for values of a and b or not, determining a quality factor value corresponding to the filtering channel set the most similar to the forward channel set as a final value of the quality factor Q if YES, otherwise changing the value(s) of the a and / or b, and turning to step 3 for cycling. According to the method, the values of the slope a and the index b are dynamically selected on the basis of the Li Qingzhong experience formula method, and the value of Q calculated under the control of the forward channel set is more consistent with a practical geological condition.

Description

technical field [0001] The invention relates to the technical field of data processing in the field of oil and gas geophysical exploration, in particular to a quality factor calculation method under the constraint of seismic data. Background technique [0002] In the reflection seismic data processing technology in the seismic exploration of oil and gas fields and mineral resources, the quality factor Q is an important parameter to characterize the absorption and attenuation characteristics of the medium, and it is of great significance in predicting lithology, oil and gas reservoir location and range, etc. Therefore, how to calculate effectively It is very important to obtain the Q value for the follow-up geophysical exploration work. The existing calculation methods of Q value mainly include Li Qingzhong's empirical formula method, spectrum ratio method and so on. [0003] Spectral ratio method: the relationship between the amplitude A of the seismic wave with frequency f...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
Inventor 赵奇刘力辉
Owner 成都晶石石油科技有限公司