Joint wave field separation method for seismic data in optical fiber and wave detector well

Abstract

The invention discloses a joint wave field separation method for seismic data in an optical fiber and a detector well, belongs to the field of geophysics, and provides the joint wave field separation method for the seismic data in the optical fiber and the detector well in order to solve the problem that the seismic data in the optical fiber and the detector well collected at the same time cannot be processed at the same time. Advantages of seismic data in a well collected by the optical fiber and the detector are exerted, consistency correction of depth, time difference and amplitude of the optical fiber data is carried out by taking detector data as a reference, channel number increase is carried out on the data processed by the detector according to depth sampling density of the optical fiber data, and real fusion of data collected by two instruments is realized; and the reliability of seismic data processing in the well is effectively improved.

Description

technical field [0001] The invention belongs to the field of geophysics, in particular to a seismic data processing technology in a geophysical exploration well. Background technique [0002] In recent years, distributed optical fiber sensing (DAS) technology has gradually matured. Among them, the optical fiber vertical seismic profiling method (DAS-VSP) has become a popular method due to its advantages of full well section, high density, high efficiency, high temperature resistance, high pressure resistance and low cost. An important means of acquiring seismic data in wells. DAS-VSP technology can provide high-precision reservoir parameters, improve the fine description ability of oil reservoirs around wells, and have the ability to monitor oil and gas reservoir dynamics. In many exploration areas at home and abroad, a large number of fiber and geophone seismic data have been collected at the same time. Through comparative analysis and experience summary, it can be seen th...

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Problems solved by technology

In many exploration areas at home and abroad, a large number of optical fiber and geophone well seismic data have been collected at the same time. Through comparative analysis and experience summary, it can be known that compared with geophone data, VSP data collected by optical fiber has the following advantages and disadvantages: (1) The quality of VSP data after preprocessing is comparable to that of conventional geophones, the wave field characteristics of effective signals are similar, the time, waveform, amplitude, phase, etc. correspond better, and the frequency characteristics in space and time are consistent; (2) Compared with Conventional geophone data, optical fiber data surface multiple waves are weak, coverage times and resolution are high, and low-frequency effective signal information is rich

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