Mobil Oil Corporation

Carl A Quaglino

Thomas W Cook

Wayne A Penner

Charles D Ray

Lyndell F Scott

A seismic marine survey is carried out by traversing a line of exploration with an acoustic energy source, an array of spaced-apart receivers, and a recording system. Seismic reflection signals recorded by the receivers are digitized to provide a plurality of digital data samples. A logarithmic value is determined for each digital data sample. These logarithmic values are plotted to provide a seismogram with the seismic reflection signals being recorded in side-by-side trace relationship.

Method for logarithmic analysis of seismic reflection signals

A seismic marine survey is carried out by traversing a line of exploration with an acoustic energy source, an array of spaced-apart receivers, and a recording system. A plurality of receivers along the receiver array are selected and the maximum amplitude wavelets of the seismic reflection signals recorded from such receivers are compared to identify any trend in a select seismic survey parameter.

Method for shot point analysis of seismic reflection signals

A seismic exploration system employs a seismic energy source, a plurality of seismic energy detectors, and a seismic recording system. The recording system employs amplifiers, a multiplexer, and an analog-to-digital converter for converting analog seismic reflection signals resulting from repetitive firings of the seismic energy source to a serial output of multiplexed digital samples. Each digital sample is applied to a shift register and shifted along the shift register a number of positions equal to the digital number that represents the amount of the amplification applied to the seismic reflection signal by an amplifier in the recording system. Each digital sample is then strobed out of the shift register to a utilization device and represents the amplitude of that portion of the seismic reflection signal represented by the digital sample and as originally received by the recording system from the seismic energy detectors.

System for recording seismic reflection signals in true amplitude

A seismic exploration system employs a seismic energy source, a plurality of seismic energy detectors, and a seismic recording system. The recording system employs amplifiers, a multiplexer, and an analog-to-digital converter for converting analog seismic reflection signals resulting from repetitive firings of the seismic energy source to a serial output of multiplexed digital samples. These digital samples are sequentially strobed into selected storage locations in core memory, such storage locations being selected such that the multiplexed samples are reoriented serially by channel in successive ones of the storage locations. The digital samples are next sequentially strobed out of core memory by such successive storage locations to produce prior to each firing of the seismic source a serial-by-trace record of the detected seismic reflection signals resulting from the previous firing of the seismic source.

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Dallas, TX, United States of America

Carl A Quaglino