Effectiveness of broadband processing in shallow water areas

UDK: 550.834.05
DOI: 10.24887/0028-2448-2021-3-46-49
Key words: 2D/3D seismic survey, reprocessing, shallow water, transition zone, processing flow, ghost-wave, multiple wave, absorption, anisotropic migration, broadband processing, field measurements
Authors: N.K. Myasoedov (RN-Exploration LLC, RF, Moscow), D.N. Tverdokhlebov (RN-Exploration LLC, RF, Moscow), A.S. Pozdnyakov (RN-Exploration LLC, RF, Moscow), A.V. Gonchharov (Rosneft Oil Company, RF, Moscow)

The article describes the results of reprocessing retrospective 2D / 3D seismic data in order to obtain additional geological information on the licensed areas of Rosneft Oil Company without a significant increase in financial costs for expensive fieldwork. This is significantly important due to the beginning of a wide research of deeper prospective geological intervals in complex seismic geological conditions. First of all, it is about offshore geological exploration in shallow water and transit areas, where the cost of preparing objects is much higher than on land. Considering the fact that one of the most costly stages in the shallow water areas research is collection of primary geophysical, primarily seismic data, it becomes more and more important to re-process the previously obtained "retrospective" information using new technologies.

The seismic processing workflow developed by Rosneft specialists based on new technologies (removal ghost reflection, iterative multiple wave attenuation, absorption and anisotropic migration before stacking in the deep) and allows processing without distorting the distribution of the dynamic characteristics of the seismic record. The utilization of broadband processing technology allows increasing the amount of useful geological information obtained from seismic data and thereby allows optimizing the volume of new expensive field researches. This is especially about researches in shallow water areas and in transit areas, where the primary data had characterized by the presence of a large spectrum of various interferences that significantly distort the dynamic characteristics of the wave field. The proposed approach will allow getting an idea of the geological structure of the research area in a shorter time at the licensed areas of Rosneft Oil Company. As a result, it allows preparing detailed seismic researches at an earlier date and at lower costs for well placement and exploratory drilling.

The article describes the results of reprocessing retrospective 2D / 3D seismic data in order to obtain additional geological information on the licensed areas of Rosneft Oil Company without a significant increase in financial costs for expensive fieldwork. This is significantly important due to the beginning of a wide research of deeper prospective geological intervals in complex seismic geological conditions. First of all, it is about offshore geological exploration in shallow water and transit areas, where the cost of preparing objects is much higher than on land. Considering the fact that one of the most costly stages in the shallow water areas research is collection of primary geophysical, primarily seismic data, it becomes more and more important to re-process the previously obtained "retrospective" information using new technologies.

The seismic processing workflow developed by Rosneft specialists based on new technologies (removal ghost reflection, iterative multiple wave attenuation, absorption and anisotropic migration before stacking in the deep) and allows processing without distorting the distribution of the dynamic characteristics of the seismic record. The utilization of broadband processing technology allows increasing the amount of useful geological information obtained from seismic data and thereby allows optimizing the volume of new expensive field researches. This is especially about researches in shallow water areas and in transit areas, where the primary data had characterized by the presence of a large spectrum of various interferences that significantly distort the dynamic characteristics of the wave field. The proposed approach will allow getting an idea of the geological structure of the research area in a shorter time at the licensed areas of Rosneft Oil Company. As a result, it allows preparing detailed seismic researches at an earlier date and at lower costs for well placement and exploratory drilling.


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