HYDROCARBONS TECHNOGENIC DEPOSITS FORMATION SEISMIC MONITORING METHOD DURING THE HYDROCARBON DEPOSITS ON WATER BODIES EXPLORATION AND DEVELOPMENT Russian patent published in 2019 - IPC G01V1/38 

FIELD: geophysics.

SUBSTANCE: invention relates to the field of geophysics and can be used for the hydrocarbon deposits development in the Arctic and other seas waters monitoring, optimization and the safety improvement. Proposed is the technogenic hydrocarbon deposits formation operational monitoring method during the aquatic hydrocarbon deposits operation in the Arctic region, including the three-dimensional seismic exploration performance at the deposit exploration stage. According to its data results, performing the reservoir model construction, predicting the sub-vertical cracks systems and the technogenic hydrocarbon deposits potential reservoir layers orientation, which can be formed during the field operation. Based on this and the refracted waves registration condition from the seismic horizon first arrivals, located below the potential technogenic reservoir, calculating the distance from the elastic oscillations sources, the of the stationary seismic mowers location and the seismic receivers therein minimum required number. In the process of the deposit arrangement, placing the stationary seismic mowers at the water area bottom above the deposit in the determined during the design places, with deepening below the bottom level to a depth of at least the maximum possible level of extraction by ice ridges and hummocks. In the course of field exploitation, performing the seismic traces with elastic oscillations excited by artificial sources or groups of sources recording at the specified frequency. These sources are placed on drilling or production platforms, as well as on the artificial islands. If necessary, with appropriate justification, the elastic oscillations sources are placed in specially drilled shallow wells, placed, for example, in the developed field geodetic providing ground control points. Fluid substitutions in the hydrocarbon field and the environment monitoring is carried out by the dynamic and kinematic changes in the recorded oscillations during the seismic traces processing under close to the real time conditions. At that, determining the hydrocarbon fluids spatial migration and the emerging technogenic deposits position. In case if the field is developed simultaneously from several mining installations (ice-resistant platforms and wellhead platforms), groups of seismic mowers and the elastic oscillations sources are located near each mining installation. At that, during the field operation, in each test cycle, performing the elastic oscillations alternate excitation at mining installations and recording the elastic oscillations, which are transmitted to the integrated data processing single center.

EFFECT: technical result is increase in the hydrocarbon field development in water areas efficiency and safety, as well as the elimination of the produced hydrocarbons potential irretrievable losses due to behind-the-casing flows and the technogenic deposits formation.

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