Method of compensating seismic signal with vertical seismic profile and micro measuring well
A vertical seismic profile, seismic signal technology, applied in the seismology for logging records, etc., can solve the problems of projected wave weakness, effective wave weakness, etc.
Inactive Publication Date: 2009-10-21
罗仁泽
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"It is proposed to use the micro-logging direct wave signal to calculate the absorption compensation inverse filter of sand layers in desert areas with different thicknesses to compensate the high-frequency components of seismic data; , ordinary geophones can be used, as long as the tail cone of the geophone is inserted into the hard soil, the tight coupling between the geophone and the medium can be ensured, which greatly reduces the energy loss when the geophone receives. However, since the medium in the well is air, in loess The lithology of the medium in the borehole wall in the plateau area is generally loose loess, so the wave impedance of air and loess is very different. When the effective wave is incident on the borehole wall, the reflected wave is very strong, and the projected wave is extremely weak. There will be a certain attenuation at the receiver point on the surface, so that the effective wave arriving at the receiver point will be weaker
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[0026]The low-velocity and deceleration zones are regarded as a signal transmission system, and the transmission function of the system reflects the attenuation of seismic signals at different depths and different lithologies. The invention edits VSP or micro-logging records obtained at different depths to retain the first arrival wave, and obtains the variation of seismic signal frequency and amplitude at different depths; the variation of the first arrival wave amplitude and wavelength can be used to estimate the The variation of the frequency components at this depth in the low and slow speed zones is used to obtain the system transfer function. Therefore, for the filter responses of first arrival waves at different depths, the compensation filter function can be calculated according to the time-domain signal or frequency-domain signal, thereby compensating for the attenuation of the seismic signal received on the ground and realizing the detection of low-velocity zone earth...
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The method of restoring seismic signal with vertical seismic profile and micro log includes obtaining the transmission functions of seismic signal in different depth in low velocity layer and velocity lowering layer near the earth surface so as to obtain compensating filter function for restoring the received attenuated seismic signal; and using the compensating filter functions of different depth or different time to restore the received seismic signal so as to raise seismic signal resolution. The present invention provides lithologic seismic prospecting with powerful tool, and may be used in the seismic signal restoring in the area with earth surface of low velocity layer and velocity lowering layer.
Description
Technical field: [0001] The invention relates to a seismic signal compensation method using vertical seismic profile (VSP) and micro-logging, especially using information such as VSP and micro-logging to analyze the attenuation law of seismic signals in low-velocity and deceleration zones near the surface, and for the area It is an effective method for signal compensation to improve the resolution of seismic signals. Background technique: [0002] Petroleum seismic exploration uses artificial methods to generate seismic waves. By studying the propagation of seismic waves in underground rock formations, it investigates underground geological structures and changes in rock formations, and searches for oil and gas fields. [0003] With the continuous development of seismic exploration, seismic data acquisition has gradually extended to areas with extremely complex surface and underground geology. Due to the influence of seismic geological conditions and the limitation of explor...
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IPC IPC(8): G01V1/40
Inventor 罗仁泽
Owner 罗仁泽