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Transversal wave or conversion transversal wave exploration near-earth surface structure survey method

A technology for converting shear waves near the surface layer, applied in the field of petroleum geological exploration, can solve the problems of high cost and not being used for surface investigation of small shear wave sources quickly and efficiently, and achieves the effect of easy operation, easy interpretation and cost saving

Inactive Publication Date: 2007-11-14
BGP OF CHINA NAT GASOLINEEUM CORP
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AI Technical Summary

Problems solved by technology

[0006] (1) The cost of pure shear wave exploration by simply using shear wave sources is too high, and there is no small shear wave source that can be used quickly and efficiently for surface surveys
[0007] (2) Unable to accurately excite and receive P-S wave joint survey information at the same location

Method used

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  • Transversal wave or conversion transversal wave exploration near-earth surface structure survey method
  • Transversal wave or conversion transversal wave exploration near-earth surface structure survey method

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Embodiment Construction

[0026] The invention adopts the receiving method in the ground excitation well, vertically drills the well at the survey site, and the well depth is determined according to the lithology. The small seismograph receives the longitudinal wave and shear wave signals, records the collected data and performs routine processing to accurately pick up the first arrival of the shear wave, and complete the surface investigation of the longitudinal and shear waves.

[0027] First, use mechanical tools such as drilling rigs to drill a deep well vertically at the place to be investigated. The depth of the well is determined according to the lithology. It is required to drill at least 5-20 meters in the high-speed lithology. Greater than 1200m / s.

[0028] The shear wave excitation source adopts the shear wave excitation method in which the steel plate is combined with the crossties in the vertical direction of the well wall and hammered horizontally. The excitation source sleepers are 3-5m ...

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Abstract

The present invention is a shear wave or converted shear wave exploration near-earth surface structure investigation method suitable for seismic exploration. It adopts the reception method in the ground excitation well and vertically drills the well at the investigation site. The well depth is determined according to the lithology. The method of hammering horizontally in the direction of the wall, placing a three-component geophone in the well, using conventional small seismographs to receive the longitudinal wave and shear wave signals, recording the collected data and performing conventional processing to obtain the accurate first arrival of the shear wave. The invention solves the problem of excitation and reception in the investigation of the pure shear wave field surface layer, and at the same time can obtain the surface layer data of the longitudinal wave at one depth point, which saves cost and is easy to operate. The collected data has crisp peaks and troughs, clear first breaks, sufficient energy, and is easy to interpret, and can accurately reflect changes in surface structure.

Description

technical field [0001] The invention relates to petroleum geological exploration technology, which is a shear wave or converted shear wave exploration near-earth surface structure investigation method suitable for seismic exploration. technical background [0002] Petroleum seismic exploration is a geophysical exploration method that generates seismic waves artificially, investigates underground geological structures and changes in rock formations, and searches for oil and gas fields by studying the propagation of seismic waves in underground rock formations. Seismic exploration can be divided into three major links: seismic data acquisition, seismic data processing, and seismic data interpretation. [0003] Seismic data acquisition is to generate seismic waves artificially. On land, an explosive source is usually used, and a shallow well is drilled at a selected shot point. The depth of the well is generally 6-30 meters. The amount of explosives is generally 1-25 kg, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/16G01V1/22
Inventor 邓志文崔士天邹雪峰贺涌
Owner BGP OF CHINA NAT GASOLINEEUM CORP
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