PREPARATION METHOD OF STRUCTURES PERSPECTIVE FOR PROSPECTING AND EXPLORATORY OIL AND GAS DRILLING Russian patent published in 2013 - IPC G01V1/00 G01V9/00 

FIELD: oil and gas industry.

SUBSTANCE: seismic measurements are carried out by means of a CDP method on the surface area perspective in oil-and-gas-bearing respect. Processing and structural interpretation of seismic data is performed, thus obtaining structural maps of target reflecting horizons. Based on structural maps, additional build-up of two-dimensional networks of target reflecting horizons is performed. As per the received two-dimensional networks of target reflecting horizons and using a trend analysis method, build-up of two-dimensional networks a regional component is performed for each reflecting horizon. A local component is calculated. For cells of the two-dimensional network of the local component the prepared structures are localised for each target reflecting horizon at simultaneous fulfilment of two conditions: first - when the local component is larger than zero, and second - when a zero contour is closed. A sum of local component is defined for all the target reflecting horizons. With that, the local structure is considered to have been prepared for all the target reflecting horizons when the value of sum of local component is larger than zero. For allocated localised structures for each reflecting horizon there calculated is local structure amplitude and local structure surface area. Priority of readiness degree of the structure prepared for prospecting and exploratory oil and gas drilling is determined as per the value of amplitude and surface area of local structure, and namely: the higher the above local structure values, the higher the perspective of prospecting and exploratory oil and gas drilling.

EFFECT: improving geological informativity of geophysical surveys, localisation and ranging of prepared structures as to the perspective at preparation for prospecting and exploratory drilling.

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