OPTIMIZING SOME SEISMIC ACQUISITION AND PROCESSING PARAMETERS QARUN AREA WESTERN DESERT

Abstract

Our goal in the field of seismic data acquisition is to record the reflected waves from interfaces between different earth layer in the presence of undesired noise. Significant reflection happens when we have enough thickness, as well as, enough extension of the two layers with a contrast in acoustic impedance (density*seismic wave velocity between them). This enough thickness is defined as minimum of a quarter energy source wavelength while the extension should not be less than Fresnel zone. Fresenel zone is that portion of a reflecting interface, such that energy from that portion will arrive at detecting station within a half-cycle, so that it will produce constructive interference.

The acquisition of seismic data is simply done using an acoustic wave source (i.e. dynamite, vibroseis& thumpers, etc...) for land work and airgun, water gun...etc for marine shooting) and a sensor to detect reflected waves \ (i.e. geophone or/and hydrophone). The reflected waves, as well as, noise are detected by the sensors and recorded in the field. The most serious undesired wave is the source-generated noise. As we filter out this noise, the signal to noise ratio increases and data enhances