Workflow: signal analysis - superimpose image - offset location
Signal analysis: noise suppression, energy recovery compensation。
Superseding image: convert separated single cannon data into a system profile image。
Offset: put the signal back to its real location and form。
The ultra-deep exploration project addresses the interpretation of the work scene. Zhang hai
Seismic processing is a photo-washing exercise, which transforms the scattered signals collected by the earthquake into continuous visualization, with a piece of fragmented bricks built into a neat wall and a cubic house built. In the process of deep seismic signal processing, there are challenges that go well beyond conventional shallow management. As the depth of seismic waves spreads from the surface to the ground and re-reflects back to the surface receivers, the greater the dispersion space, the greater the geometric energy spread, and the more energy is absorbed from the ground floor, the weaker the reaction signals received, or less than 5 per cent when they are activated, like sound spreading in the air, the sound of the same acoustic bee, the more distant it is, the weaker the volume it can hear. In order to restore weak deep signals and accurately map them, the ultra-deep detection signal processing process is calculated over 40 steps, including noise suppression, energy compensation, speed pick-up, and deflection。
In the group's three-dimensional earthquake treatment process in the mid-autumn-seoul-seoul-sill-sill-sill-sill-sill-sill-sill-sill-sill-sill-sir-sill-sill-sill-sill-sill-sir-sill-sir-sir-sill-sir-sir-sir-sir-sir-sir-sir-sir-sir-sir-sir-sir-sir-sir-sir-sir-sir-sir-sir-sir-sir-sir-sir-sir-sir-sir-sir-sir-sir-sir-sir-sir-sir-sir-sir-mir-sir-sir-sir-sir-sir-sir-seat-mun-mun-murth response to a world challenge。
Seismic data processing needs to be conducted in such a way as to preserve the truth and address the challenge of noise suppression. Like a sack of rice mixed with different particles and different types of impurities, the process of sifting them out is the process of noise suppression. In the course of the earthquake, the roller waves, ground-based industrial traffic vibration interference, random interference with wind-blowing grass, 50 hz interference with high-pressure lines, etc., are all received with a reflection signal. In the process of noise removal, the jamming wave is to be removed on the one hand, while at the same time ensuring that no harm is done to an effective reflection wave. As with surgery, it is necessary to remove the pathogen and protect the health organization. More difficult than surgery, noise and effective signals are not compartmentalized, but are folded together, making noise a double-edged sword that requires precision。
In the course of its operations, the processing team has developed a “six-dimensional” noise-disturbing technique, which is based on classification, timing, frequency, division, step, partition suppression of interference, in general on the principle of “pregence, randomity, low frequency and high frequency”, rules of noise and low frequency noise energy, weight, first suppression, random noise and high frequency noise interference followed by suppression, and extracts effective signals from the interference of fish plumes through multi-area combinations, multi-temporality, step-by-step suppression。
The second is a fine energy analysis that accurately restores the signal to its original state. Seismic signals run long distances, spreading energy on the one hand and absorbing it on the other, gradually weakening and uneven energy. It is also explosive, and the estranged twilight soil is less energy-transmitting than the dense rock, as is the sponge and rock, with different degrees of stress; it is also the desert surface receiving, with a more looser backwind receiving capacity, as opposed to that of the wind-opener, as is the dissipation of black cloth and white cloth; and it is the same deep spreading, with the tilted, fractured and fractured strips less reflective than the flat layer reflecting, as if it were a cavity lens, with a fractured glacial glacial vista with a weaker focus than the smooth surface. In such transmission processing, it is necessary to restore different levels of stimulation, diffusion and reception energy。
In response, the processing project team developed geometric proliferation compensation, geo-coherent energy balance and anti-q filtering techniques to restore the symptoms of severe decay and spatial inconsistency。
Once again, it's fine speed tracking. It's exactly the same. The core of earthquake transmission is at speed. When we decide on watermelon maturity, we usually hit the surface with a hand, judging by sound. When the guacamole is premature, the interior is dense and the sound is clear; when the guacamole is mature, the interior is loose and the sound is dull, which is a phenomenon where the lax media is more absorbing the wave and the wave is spreading more slowly. Seismic waves spread at different speeds in different rocks, and when the local lower rock layer has a higher pore, the rate of seismic transmission is lower than that of comparable rocks, especially when it is oily. For a signal to be transported from different directions to the same position, the precise capture of velocity changes requires a zero-shield correction of all reflecting signals to the same reflection position, i. E., the correction of all signals to the calibration wavers required for transmission of the signal at the same point of origin, at which time the synchronized co-heavy is the strongest. Like multiple flashlights, in order to keep the light brightest in the straight front, the beams should be focused and the starting point should be the point of the flashlight in the centre. The post-correction seismic supersection basically reflects the underground structure。
And finally, deep-diverse imaging, and the signal returns to real. When the local layer is horizontally structured and horizontally consistent, superseding is like horizontal, but when the layer changes horizontally, the superseding image is not consistent with the actual shape of the product (i. E., the tipping, inclination and direction of the layer) and produces a haja mirror effect, as is the case for the fish in the water from a certain perspective, where the position is not the real location of the fish, and where the fish is caught, it must be relegated. The location and shape of the profile is not entirely true when the seismic signal is not defunct. Seismic offsets undergo four phases of post-clap time offset, post-clause depth offset, pre-clause time offset and pre-clause depth offset。
In order to place deep seismic reflections in an accurate position, the eastern surveyor imaging team has developed various techniques for pre-discretion depth deflection of well-controlled heterogeneity, which are significantly more accurate than traditional technological attributions. In the garage mountains, the traditional method can have a depth error of more than 10 per cent and a horizontal error of up to 1,000 metres, while the new method reduces the depth error to 1 per cent and the horizontal error to less than 50 metres。
