RESULTS OF THE DIRECT-PROSPECTING METHODS FOR SATELLITE IMAGES FREQUENCY-RESONANCE PROCESSING USING WITHIN AREAS OF WELLS LOCATION ON OFFSHORE AND ONSHORE

Abstract

Additional study of the possibility of using the direct-prospecting technology of remote sensing data (satellite images) frequency resonance processing for operative assessment of the oil and gas potential of individual structures and local sites in order to select the optimal locations for the prospecting wells drilling are described. Experimental studies of demonstration character were conducted using this mobile technology in the eastern Mediterranean, in the economic zone of Bulgaria in the Black Sea, in the Pripyat trough of the Republic of Belarus and in the South China Sea. Wells have been drilled within the surveyed structures and areas, one of which was in the process of drilling.
In the Mediterranean, an anomalous zone is mapped over the Zohr gas field, which is quite satisfactorily correlated with the structural map of the site. To the east of the unproductive Kg 70-1 well, an anomaly has been discovered, within which the channel of vertical fluid migration with the pressure of 141.0 MPa is located. On the drilling site of the Onisiforos West-1 well, an anomalous zone of "gas" type was discovered, and seven anomalous polarized layers of "gas" type were identified by the vertical scanning of cross-section near the well. These results increased the probability of gas deposits finding in the "Onisiforos West-1" well. A large anomalous zone of the “oil and gas” type is mapped on the area of the MINOAS structure.
In the Black Sea, an anomalous zone of the "gas" type with an area of 36 km2 and a channel of fluid vertical migration with a pressure of 95.0 MPa were found on the area of the “Polshkov-1” well drilling within the Khan Asparuh block. At the drilling site of the “Rubin-1” well, anomalous responses at the resonant frequencies of oil, gas and gas condensate were not detected; industrial (commercial) inflows of hydrocarbons in this well will not be received after the completion of its drilling. Within the large block of Silistar, four anomalous zones of the "oil+gas" type have been discovered, which deserve priority attention during the detailed prospecting works carrying out.
“Predrechitskaya-1” deep well in the Pripyat trough is located at the edge of the mapped anomalous zone and industrial inflows of hydrocarbons in it have not been obtained. Above the Ugolskoye oil deposit an anomaly has been discovered, within which the channel of deep fluids vertical migration with a pressure of 135 MPa is localized.
On a local site in the South China Sea, studied by a 3D seismic survey and drilling two anomalous zones of "gas hydrate” type were detected and mapped on the resonant frequencies of the gas hydrates and four anomalous zones of the "gas reservoir" type at the resonant frequencies of gas. In the Gas-2 anomaly contour a channel for deep fluids vertical migration was revealed and localized - a small local area with very high reservoir pressure values of 67 MPa.
The anomalous zones discovered by the direct-prospecting method can be regarded as projections of the hydrocarbon accumulations contours in a cross-section on the day surface. This operative and supplementary information can be used to access approximately the hydrocarbon resources within the surveyed areas and structures. The results of the performed experimental studies testify to the expediency of using the direct-prospecting technologies for localization of optimal drilling sites for prospecting wells. An increase in the drilling success rate can lead to a significant acceleration and optimization of the geological exploration process for oil and gas in general