Prestack time migration method for compensating absorptive attenuation

A pre-stack time migration, absorption and attenuation technology, applied in the direction of seismic signal processing, etc., can solve the problem of viscous absorption without compensating seismic wave

Active Publication Date: 2012-07-18
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
View PDF6 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current prestack time migration method does not have the ability to compensate for the viscous absorption of seismic waves

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
  • Prestack time migration method for compensating absorptive attenuation
  • Prestack time migration method for compensating absorptive attenuation
  • Prestack time migration method for compensating absorptive attenuation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0213] Embodiment 1: A pre-stack time migration method for compensating absorption attenuation, taking a block in the South China Sea as an example, the specific steps are as follows:

[0214] (1) Use a single streamer to record the reflected seismic signals excited by the artificial source and record them on tape. The specific reflection seismic signal is that a single streamer is used for acquisition, each streamer has 930 traces, and the trace spacing is 3.125m; the front end of the streamer is excited by an air gun array source, and the distance between the air gun array and the first receiving channel is 130m, and the recording length 5s, time sampling 1ms. A total of 666 shots were fired and recorded, with a shot spacing of 12.5m.

[0215] (2) Read the seismic signals from the magnetic tape, and perform conventional noise attenuation processing on the pre-stack seismic data. For some common center points, the common center point gathers are extracted, and the extracted...

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

A prestack time migration method for compensating absorptive attenuation is applied to the processing of reflex seismic data in seismic prospecting. According to the method, attenuation of amplitude of high frequency seism, caused by earth medium viscosity and thin layer scattering, is compensated in the migration process, the attenuated high frequency component is restored, so that the image resolution ratio of intermediate and deep constructions reaches up to the degree approximately to the shallow construction, and the stability is guaranteed and the noise amplification is avoided. No hypothesis is made on lamination or uniformity of a Q-value space distribution, and by introducing an equivalent Q-value describing absorptive attenuation of the seismic amplitude, the compensation of absorptive attenuation and prestack time migration are effectively combined together. The method can determine the equivalent Q-value on the basis of reflex seismic data collected on the ground, so that the difficulty in determining the Q-value by the existing various absorptive attenuation compensation methods is avoided. The method can better indicate rupture and stratum deposition patterns of the intermediate and deep constructions and is of great application value for the exploration of oil gas and mineral resources.

Description

technical field [0001] The invention belongs to the technical field of reflection seismic data processing in seismic exploration, relates to the field of pre-stack migration imaging technology in the process of seismic data processing, and is a pre-stack time migration method capable of compensating the absorption attenuation of seismic wave propagation in migration calculation . Background technique [0002] In the processing of reflection seismic data in seismic exploration, pre-stack migration imaging is a key link, and pre-stack time migration is an important method in pre-stack migration imaging. The pre-stack time migration method can better image a type of geological structure with complex faults but less severe lateral velocity changes. Compared with the pre-stack depth migration method, in addition to its higher computational efficiency, its main advantage is that it only needs to use the stacked (root mean square) velocity; in this way, an appropriate velocity mod...

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 Applications(China)
IPC IPC(8): G01V1/28G01V1/36
Inventor 张剑锋吴吉忠李雪英
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap