OIL AND GAS POTENTIAL OF THE KHALI-NEFT DASHLARY ANTICLINE ZONE IN RELATION TO ITS PALEOTECTONIC SETTINGS

Abstract

Relevance The study was carried out in Absheron oil and gas region, which is one of the productive in Azerbaijan. The aim of implemented researches consists in increasing hydrocarbon production which is achieved by identifying new oil and gas reservoirs within deposit. From this point of view reservoirs associated with anticlinal and non-anticlinal types of traps within the Khali‒Neft Dashlari anticlinal belt were identified. The approach was based on section Paleogene-Miocene sediments, the identification of reservoirs was associated with anticlinal and non-anticlinal types of traps. Such approach has an important practical feature and this will definitely play an important role in increasing oil and gas production in the republic. Our studies were carried out according to the criteria determining oil and gas potential, such as geothermal, lithofacial, tectonic, paleotectonic, etc. Estimations and attempts to identify new reservoirs were carried out along the stratigraphic profile of the Paleogene-Miocene and Pliocene ages. The main aim of the research is to determine, from geothermal aspect, present location of the productive series deposits within the oil and gas generation zone and, in this relation, clarify prospectivity of the zone, as well as to investigate the prevalence of non-anticline traps in association with paleotectonic properties and syndepositional evolution of the zone. Research area: individual structures representing Khali‒Neft Dashlari anticline zone, Lower productive series suites. Methods. Changes in total thickness and sandiness of the productive series deposits within the structures under investigation were analyzed at local and regional scales, the corresponding diagrams reflecting the patterns of changes in thickness and sandiness of individual suites were plotted. Paleoprofiles reflecting the paleotectonic evolution of the structures of the Khali‒Neft Dashlari anticline zone were constructed. Results. Construction of the deposition rate diagram and, in this regard, the data analysis, study of the paleotemperature environment of the Pirallahi-Kelkor depression and the analysis performed allow us to determine the terms of staying of both the productive series and the underlying Miocene, Paleogene and Mesozoic sediments within the main oil and gas formation zone, as well as to compare the major migration stages with the structure formation periods within a given territory. The results of all studies carried out in this direction allow us to state that the research area and its environs are also promising from the point of view of oil and gas potential.

Keywords

• thickness
• sandiness
• prospectivity
• zone
• structure
• deposit
• paleoprofile
• productive series
• paleotectonics
• oil
• gas