Peculiarity of changes of formation temperature within the Absheron-Pribalkhan uplift zone in connection with the processes of oil and gas generation

The article presents the results of the analysis of the hydrocarbon potential (KH) of the Lower Pliocene sediments (Productive series (PS) in the Azerbaijan sector and Red colored series in the Turkmenistan (RS)) and the temperature conditions for its realization within the Absheron-Pribalkhan uplift zone. The analysis is based both on the study of the regularities of changes of temperature in the space, and on the directly evaluation of maturity of organic matter (HC) in the rock. As a result of the studies carried out, the low hydrocarbon potential of the Lower Pliocene sediments (PS-RS) and the epigenetic nature of the main hydrocarbon resources of the South Caspian Basin are confirmed. Two temperature zones are distinguished within the Absheron-Pribalkhan zone, the boundary between which passes along the supposed deep break fault between the structures of Neft-Dashlary and Gunashly. In accordance with the revealed zonality in the NW of the part of the zone, the upper threshold for the beginning of oil generation is timed to a depth of approximately 2.8 km and in SE it is submerged to a depth of approximately 4.5 km. On the whole, the organic matter of the Lower-Pliocene rocks within the Absheron-Pribalkhan zone, in the considered depth interval, is characterized by low maturity and is below the "oil window".