Frequency division matching method for increasing seismic data resolution of limestone exposure area

Abstract

The invention discloses a frequency division matching method for increasing seismic data resolution of a limestone exposure area. In the frequency division matching method, a high-sensitivity detector and conventional detectors are considered to be used for observation under same conditions; then, seismic data acquired under the same conditions are respectively subjected to frequency division treatment by taking 20Hz as a boundary; then the seismic data more than 20Hz, corresponding to the high-sensitivity detector, are used as desired output to figure out a matched filter; furthermore, the seismic data more than 20Hz, which are acquired by all the conventional detectors, are subjected to matching filtering; and finally, the seismic data smaller than or equal to 20Hz, which are acquired by the conventional detectors, as well as the matched seismic data more than 20Hz are subjected to data reconstruction to obtain the seismic data subjected to frequency-division matching. According to the invention, the high-frequency components, corresponding to the seismic data, of the conventional detectors are enhanced, the low-frequency components are maintained, and the resolution of the seismic data of the limestone exposure area is increased.

Description

technical field [0001] The invention relates to the field of seismic exploration, in particular to a frequency division matching method for improving the resolution of seismic data in limestone outcropping areas. Background technique [0002] The distribution of marine carbonate sedimentary basins in southern my country is vast. Judging from the current discovery of the Puguang Gas Field, this area is extremely rich in underground oil and gas resources. At present, conventional geophones can effectively receive low-frequency components of seismic data in large-scale limestone outcropping areas, but cannot effectively receive high-frequency signals; high-sensitivity geophones can effectively receive high-frequency signals, but high-sensitivity geophones amplify low-frequency noise 1. Poor reception of low-frequency signals makes it difficult to obtain high-resolution seismic data in limestone outcropping areas, which seriously restricts further oil and gas exploration in this...

AI Technical Summary

Problems solved by technology

At present, conventional geophones can effectively receive low-frequency components of seismic data in large-scale limestone outcropping areas, but cannot effectively receive high-frequency signals; high-sensitivity geophones can effectively receive high-frequency signals, but high-sensitivity geophones amplify low-frequency noise 1. Poor reception of low-frequency signals makes it difficult to obtain high-resolution seismic data in limestone outcropping areas, which seriously restricts further oil and gas exploration in this area

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