The lithological-petrography characteristics of chalk, paleogen-miocene deposits of Yalama-Khudat areas and Siyazan monocline anticline in connection with their oil and gas content (south-east immersions of megaanticlinoric of Greater Caucasus)

Abstract

In recent years, geological prospecting and geophysical works in Azerbaijan were carried out in considerable volume in order to study an oil and gas potential of Meso-Cenozoic deposits. Based on the results of these studies the criteria were developed as the basis for further research. It is known that the sedimentation basin mainly dipped in the Meso-Cenozoic time. As a result, the researchers have no doubt about the potential of these deposits in the central part of the studied area and at greater depths, but there have been no precise calculations yet. In order to solve this problem, we have studied the reservoir rocks properties of considered ages of Khudat, Yalama oil and gas bearing structures and Siyazan monocline formed in Gusar-Davachi superimposed mulde in various geological conditions and at different depths. For an easier analysis, all the actual data are given in tables showing the physical parameters of the different rock types, involved in geological structure of oil and gas bearing areas. In order to clarify the obtained results and the changes nature study of the considered physical properties the various petrophysical methods were applied. As a result the regularity in changing of rocks density, carbonate contents, porosity, permeability and the propagation velocity of ultrasonic waves in them were established. However, in tectonically complex structures of the Siyazan monocline the applied methods have not given expected results of studies because of their severe dislocation and outlet to the surface. Taking this into account the reservoir characteristics studies of rock samples of considered ages from fields being developed in the north-eastern slope of the south-east Greater Caucasus dipping were conducted. The main objective is to study the petrophysical parameters and reservoir rocks properties of the Cretaceous, Paleogene-Miocene age in tectonically complex uplifts of Yalama, Khudat and Siyazan monocline placed at southeast Greater Caucasus dipping due to its petroleum potential.

Keywords

• petrophysics
• density
• porosity
• mesokaynozoic
• oil and gas accumulation rocks
• lithofacies
• graphical analytic method
• collector
• carbonate content
• the velocity of longitudinal waves
• terrigenous-carbonate formations
• trough
• drilling
• geophysics
• reef