METHODS FOR PREDICTIVE ASSESSMENT OF OIL AND GAS CONTENT IN THE FIELDS OF THE EUPHRATES GRABEN

Abstract

The high degree of exploration of the Euphrates graben and the oil and gas fields discovered here allows to consider this region as a reference object for identifying the main regularities in the structure of hydrocarbon deposits and the conditions for their formation. Analyzing the geological structure of the Dubaysan, Northern Dubaysan, Della, Sayad deposits and developing additional criteria and methodological approaches to forecasting promising zones and local objects are urgent tasks. Their solution can become the basis for forecasting and substantiation prospecting and exploration of additional industrial deposits of hydrocarbons in the studying area. The results of the analysis and refinement of seismic data and geophysical studies in wells collected during the restoration of the oil industry of the Syrian Arab Republic, using modern methods of processing and interpretation of seismic data, are presented. Geophysical data of the main oil fields of the Rasafa basin - Dubaysan, Northern Dubaysan, Dilaa were used, and the criteria and methods for predicting oil and gas content were refined, taking into account the tectonic features of the development of the Euphrates graben and the formation of oil reservoirs. As a result of the analysis and refinement of seismic data and geophysical studies in wells using modern methods of processing and interpretation of seismic data in the conditions of the sedimentary cover of the Euphrates region of the Rasaf basin, a forecast of the oil and gas content of sediments of the Carboniferous period was made. Based on the analysis of the dependence of the reservoir parameters of rocks on their facies nature, the factors of formation of zones of reservoir distribution in the conditions of the Rasafa basin and the criteria that increase the adequacy of a correct forecast of oil content have been determined. It has been established that the most promising deposits in this reservoir region are associated with dolomites in shallow marine sediments.