Possibility and applicability of pseudo-random code functions in impulse-code seismic concentration to oil and gas seismology problem-solving research

Abstract

The applicability of pseudo-random code functions in impulse-code seismic concentration to oil and gas seismology problemsolving has been assessed through the comparative analysis of correlation functions in  compliance with pseudo-random pulse sequences and linear change in pulse repetition sequences. The  research shows that the correlation functions’ main peaks spectrums of pseudo-random pulse sequences  are almost equal to the single impulses’ spectrums used for the sequences development. The given  circumstance reflects the general possibility of pseudo-random sequences applicability to oil and gas  seismology problemsolving. However, pseudo-random sequences are characterised by the increased  interference level of correlative transformation, which makes the use of pseudo-random code functions in oil and gas seismology inappropriate. It is noted that not only are impulsecode pseudo-random signals  characterised by high-amplitude correlation noise, but also all the other pseudo-random complex signals, e.g. random quasi-harmonic signals, contained in modern vibroseis management systems.