Wide band seismic exploration method

Abstract

The invention discloses a wide frequency earthquake exploration method capable of improving resolution capacity of exploration. The method comprises the following steps that: a single geophone is arranged at each seismic trace; wide frequency acquisition is carried out by the single geophone arranged at each seismic trace to the earthquake reflection wave generated by an artificial seismic source; spectrum equalization processing is carried out to a plurality of earthquake reflection waves acquired by the single geophone at each seismic trace, and then horizontal stacking is carried out so asto obtain broadband earthquake reflection waves with equalized frequency component energy;finally, demarcation is carried out by using an earthquake cross section and a geologic horizon displayed by the broadband earthquake reflection waves. The method can find out the macro geological structure of oil fields, gas fields and coal fields; meanwhile, the distribution of thin layers (thickness of 1 to 3 m) and the specific status of small faults (wherein the fall is 1 to 3m) are found out. The method provides more detailed earthquake geological materials for the exploration and development of the oil fields, the gas fields and the coal fields.

Description

technical field [0001] The invention relates to a geological prospecting method for petroleum, coal, construction engineering, etc., in particular to the most commonly used physical prospecting method, that is, a broadband seismic prospecting method. Background technique [0002] Seismic prospecting is the most important physical prospecting method for surveying geological structures of oil and gas fields and coal fields. Its technical methods were mainly imported from abroad from the early days of the founding of the People's Republic of China to the 1990s. At the beginning of 1992, the "High Resolution Seismic Exploration Experimental Research" independently developed by China National Petroleum Corporation achieved important results, and won the second prize of the National Science and Technology Progress Award in 1997. Since then, from 2002 to 2007, the inventor of this technology (a retired employee of Henan Oilfield) cooperated with Beijing Huachang Xinye Geophysical E...

AI Technical Summary

Problems solved by technology

[0005] 2. The moving coil velocity type geophone is used to collect seismic reflection waves, which cannot overcome the serious absorption of the high frequency components of the reflection waves by the ground

[0007] 4. Conventional seismic survey detection line profile or three-dimensional data volume, only one frequency band is displayed, such as 10-45HZ frequency band display, when it is more than 2.5 seconds, the reflected wave is only 20--40HZ, and can only distinguish 60--40 meters thick formation

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