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

Active Publication Date: 2007-01-03
BGP OF CHINA NAT GASOLINEEUM CORP
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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 u

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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
  • 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

A prospecting near surface layer configuration investigating method is suitable for the transverse wave of conversion transverse to earthquake prospecting. Its incepting fashion is in the floor excitation well. Vertically make a hole at the research place and the depth of the well is according to the rock nature. The transverse wave excitation source is the hammer horizontal tap taken by the armor plate and sleeper along the uprightness direction to the wall of the well. Adopt general mini type seismograph to incept the longitudinal and transverse wave signal by the three-component geophone inside the well and take a general disposal to get a veracious for the picking the first transverse wave arrival by the data. It solves the excitation and incepting problem of the field surface research to pure transverse wave and gets the surface layer information of longitudinal wave with low cost and handy manipulation. The wave crest, trough and the first transverse wave arrival are clear with enough energy and accurately reflect the change of the surface layer.

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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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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