Petroleum potential of reservoirs at the Paleozoic-Mesozoic boundary in West Siberia: seismogeological criteria (example of the Chuzik-Chizhapka regional oil-gas accumulation)
There are six sedimentary seismic sequences overlying pre-Mesozoic basement in the Mesozoic-Cenozoic sedimentary cover of the Arctic regions of West Siberia and the Kara Sea shelf. The paper describes the seismic markers characteristics and the seismic-facial features of the Paleozoic, Triassic, Jurassic, Neocomian, Apt-Cenomanian and TuronianCenozoic seismic sequences. It was concluded that the features of large Cenomanian gas pools are seismic markers associated with gas-water contacts; Apt-Albian pools are displayed on time sections by a bright spot seismic anomaly.
Within the West Siberian petroleum basin, more than 60 oil and gas fields have been discovered in the pre-Jurassic basement formations. Reserves of these fields are referred to hard-to-recover ones due to both the complexity of the geological structure and the need to apply non-standard approaches at all stages of their search, exploration and development. Development of the Pre-Jurassic complex is one of the main directions in replenishing the raw material base of hydrocarbons in West Siberia, where production from traditional fields is steadily declining. The article summarizes the data on geological features and petroleum potential of the Pre-Jurassic complex of the West Siberian basin. Based on the analysis of results of exploration and development of accumulations, proposals on various geological and technological parameters are formulated when performing the geological and economic appraisal of promising targets with similar predicted characteristics.
SEISMIC AND GEOLOGICAL CHARACTERISTICS OF SEDIMENTARY SEQUENCES AND PETROLEUM POTENTIAL OF THE YAMAL, GYDAN AND SOUTH KARA PETROLEUM AREAS (Arctic regions of West Siberia, the Kara Sea shelf)