A method and device for prestack time migration
A pre-stack time migration and aperture migration technology, applied in seismic signal processing and other directions, can solve problems such as travel time and velocity errors, affecting imaging accuracy, etc., to avoid errors, improve imaging efficiency and imaging quality.
Active Publication Date: 2018-12-25
BC P INC CHINA NAT PETROLEUM CORP +1
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] In the prior art, using the integration method to calculate the pre-stack time migration needs to correct the ground surface to a unified horizontal datum, which will cause travel time and velocity errors and affect the imaging accuracy. pre-time offset method
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0047] In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described The embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the scope of protection of the present application.
[0048] From the above analysis, it can be seen that the correction from the surface to the unified horizontal datum will often cause errors in the accuracy of the velocity analysis and the travel path of the seismic wave. It can reduce the error caused by calibration. figure 1 It is a method flow chart of an e...
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
Login to View More Abstract
The invention provides a pre-stack time migration (PSTM) method and device. The method comprises: obtaining the common-mid points and common-mid point trace gathers of imaging points in a migration aperture scope from earthquake data; calculating the travel time of a recording channel at the imaging points according to the earthquake data of the recording channel in the common-mid point trace gathers; extracting the amplitude value of the recording channel in the travel time; and calculating the amplitude mean value of the common-mid points according to the amplitude value, and using the amplitude mean value as the migration amplitude of the imaging points. According to the technical scheme, the method and device can calculate the migration amplitude at practical positions of the imaging points, thereby avoiding travel path calculation errors caused by correcting the earthquake data to a unified reference surface, and improving PSTM imaging efficiency and imaging quality.
Description
technical field [0001] The present invention relates to the technical field of seismic imaging processing, and in particular, to a method and device for pre-stack time migration. Background technique [0002] Prestack time migration can be used as an important means of complex structural imaging and velocity analysis, and has been widely used in prestack migration technology for petroleum exploration. Pre-stack time migration has high imaging accuracy and low computational cost. From the perspective of oil companies, pre-stack time migration can improve oil development benefits and reduce exploration and development risks. [0003] In the prior art, the integration method is usually used to calculate the prestack time migration, which mainly includes two steps: the first step is to obtain the travel time according to the travel path of the seismic wave in the recording trace, and the second step is to obtain the seismic wave of all the recorded traces according to the travel...
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
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30
CPCG01V1/30
Inventor 金守利钱忠平赵波
Owner BC P INC CHINA NAT PETROLEUM CORP