The thesis is devoted to the features of formation and prediction of petroleum potential of the Sribnyanska depression with a complex of structural-thermo-atmogeochemical research (STAGR) in order to define the prospects of hydrocarbon deposits in the northwestern part of the Dnieper-Donets rift (DDr).
For the first time on the territory of the Sribnyanska depression and its framed complex of near-surface, express structural-thermo-atmogeochemical research, which allowed establishing the features of the distribution of temperature and gas fields within the object of research were performed. The choice of the areas of the STAGR is based on available materials and data on the and oil-and-gas structure of the Sribnyanska depression, in our opinion, there were structures: Kvitneva, Dovhalivska – Pd. Trostyanetska, Pn. Ozeryanska, Samoylivska and Pn. Hnidyntsivska. These objects are located within the limits of the slopes of the same depression, on which 107 observation points (OP) for areal study with an area of 78.2 km2 and 70 OP profile surveys 138 km long.
Based on a result of satellite image interpretation, maps of lineaments and ring structures were built. 4 graphs and 75 distribution maps of temperature, emanation and hydrocarbon indicators were created. The recommendations for involve the STAGR techniques for selection promising hydrocarbon gases areas on the basis research results are given.
In order to increase the chances of success estimation of the prospects of the areas in the complex analysis of available information on the oil-and-gas content of the research area, the following criteria (indicators): structural-tectonic, temperature, emanation, gas and hydrocarbon are applied.
The experience of tectonic zones definition by complex of near-surface methods STAGR allows revealing, charting, and tracing tectonic displacements, dissipation zones and fractures of rocks that are not mapped by traditional geological and geophysical methods. The study of these is of practical importance when using different types of exploration works on oil and gas.
Regardless of regional (profile) or local (areal) studies, individual observation points, in which identified helium and hydrogen were detected over deep tectonic dislocation or on their continued.
For the first time according to developed criteria (indicators) in the area studies STAGR, 5 schemes of placement of perspective sites in the search for explosives were created. Further structural-thermo-atmogeochemical researches with further parametrical drilling were recommended.
Complex STAGR is implemented in studying of oil and gas prospects of the Sribnyanska depression made it possible to determine the mapping features of the regional tectonic zones of deep-seated basement faults (prereef). This allows us to recommend the introduction of the STAGR complex at the initial stages into prospecting and exploration research on oil and gas within tectonic structures promising for hydrocarbon deposits. It is recommended within the tectonic structures to carry out detailed work, with the obligatory reduction of the step of observations and repeated observation and measurements.
With the purpose of prediction of reservoir type over forecast and promising areas determined by STAGR, the technology of the use of relations of gas indicators (The ratio of ethane to propane, the log of the ratio of ethane to propane plus butane against the log of the ratio of methane to ethane plus propane.) has been set up. For the first time in the methodology of work and DDr, the analysis, estimation of the phase state of the explosives in the deposits on the ratio of atmospheric indexes was used. New approaches to the processing and interpretation of information obtained during near-surface thermo-atmogeochemical researches were proposed, which allowed raising the level of scientific substantiation of predictive estimations for the detection of new hydrocarbon deposits. Proper integration of surface geochemical data with subsurface data leads to better prospect evaluation and risk assessment. Using this relationship, in the complex STAGR, allows improving the methodology of conducting research.
Keywords: Dniper-Donets rift (DDr), Sribnyanska depression, STAGR, satellite image interpretation, near-surface atmogeochemical surveys, emanation survey, temperature surveys, petroleum potential, atmogeochemicals figures, trap formation, deposit phase-state forecasting.
