METHOD OF DETERMINING FLOODING IN MULTILAYER DEPOSIT BY SEPARATING GRAVITATIONAL EFFECT FROM FLOODING OF RESERVOIRS AT DIFFERENT DEPTHS USING SEISMOMETRIC OBSERVATIONS Russian patent published in 2024 - IPC E21B47/10 G01V11/00 

FIELD: mining.

SUBSTANCE: invention relates to a method for determining watering in a multilayer deposit. Disclosed is a method for determining flooding in a multilayer deposit by separating the gravitational effect from flooding of reservoirs at different depths using seismic observations. Method includes obtaining gravimetric monitoring data on lifting of gas-water contact (GWC) in productive formations, field seismic surveys in the form of an arrangement of a ground seismic antenna, consisting of reconnaissance, conducting reconciliation observations, analysing records and sending the results to a cameral group. At the same time arrangement of equipment on the site of works is carried out in the form of a ground antenna according to design coordinates on the basis of numerical full-wave 3D seismic modelling. Seismic signal is recorded, wherein for quantitative assessment of seismic activity and its objective comparison for different seismic antennae, search for seismic events is carried out for antennae located around observation wells with well survey control. Further, records are prepared and transmitted to a cameral group for data processing, as well as repeated reconciliation observations. At that, data processing includes gravitational density modelling to determine the value of gas-water contact movement, search of hypocentres of seismic-acoustic emission events, calculation of local density of seismic events, plotting a graph of the relationship between the average value of watering of a given formation for the period of field seismometric operations within the seismic antenna and local density of recorded seismic events. Based on the obtained average values of local density of seismic events and values of GWC rise according to well survey control data, the value of watering is determined.

EFFECT: determination of the degree of flooding used as refinement of the geodensity model of the deposit of each productive formation in the multi-formation deposit.

1 cl, 4 dwg