Lithological-facial model of Apsheron deposits on Kirikilinsky area

Abstract

Research for gas accumulations in Quaternary deposits was conducted until the mid-sixties of the last century, when gas traps were discovered on the territory of western Kazakhstan, the south of the Astrakhan region and other territories. According to the research results, it was concluded that almost on the entire territory of the Astra-khan-Kalmyk Pre-Caspian area there accumulated the sea deposits, predominantly clay deposits. There has been carried out correlation of the inter-well space, as well as interpretation of GIS in the well logs for structural wells drilled on the territory of the Kirikilinsky area in the 1960-1970s. A lithological-facial model was built based on the research results, together with seismic data. The model demonstrates that previous works should be revised, since the territory in the Apsheron period experienced several transgression-regression cycles. As a result of these processes, sandstone beds with alluvial and deltaic facies were formed. The increased sand content of the Apsheron period also proves that the study area is more complex in structure than it was previously thought.