Method and technology of seismogeochemical oil and gas habitat forecast

Currently, the forecast and prospecting for oil and gas habitat are carried out based on a comprehensive study of geological, geochemical, and geophysical parameters of the sedimentary section, based on the interconnection and interdependence of geochemical and geophysical fields in space and time, and most manifested in the phenomenon of paragenesis of zonal-annular anomalies of geochemical and geophysical fields over hydrocarbon deposits.

To assess the oil and gas content of potentially productive complexes, a proprietary seismic and geochemical forecasting methodology, implemented on a genetic basis in a multilevel system: the earth’s surface-well-target horizon (potentially productive deposits), is applied. Based on geochemical studies of deep wells, a parametrized geological-geochemical model of the sedimentary section of the work area is compiled, oil and gas-promising intervals and horizons are delineated, and phase saturation, composition, and properties of hydrocarbon systems are identified. Then the results are linked to ground-based survey data, where anomalous geochemical zones caused by migration processes from hydrocarbon deposits, which have characteristics and properties of reservoir naphthides, are identified. Complex processing and interpretation of geochemical and geophysical (seismic) data is carried out, linking the anomalies of seismic attributes (reservoirs) at depth and geochemical parameters on the surface of the earth, delineating the distribution zones of reservoirs, and identifying their phase saturation (oil, gas, water), and forecasting the composition of hydrocarbon fluid. To link geochemical anomalies in-depth, the hydrocarbon concentration fields are modeled on the level of potentially productive horizons using the APGP software complex (solution of the inverse problem of geochemistry). The results of modeling geochemical fields make it possible to delineate the sources of migration of hydrocarbon gases, helium, hydrogen (oil and gas-saturated reservoir) in the sedimentary section. Modeling of hydrocarbon fields, helium, hydrogen, and carbon dioxide concentrations with the design of a 3D geological-geochemical model including the oil and gas-bearing rock complex (collector) and overlying over-productive deposits in hydrocarbon dispersion halo, up to the ground surface is carried out within the identified oil and gas perspective zones. The latest work is carried out using PC “Selector” (solution of the direct problem of geochemistry).

The performance of some works in the Bohansky, Myrninsky, Tas-Yuryakhsky, and other areas of the south of the Siberian platform allowed not only to localize of a gas-saturated reservoir in the productive complex but also to reveal several hydrocarbon accumulations in potentially productive complexes.

методика сейсмогеохимического прогнозирования нефтегазоносности

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