On oil-and-gas content of Mesozoic deposits in Azerbaijan

• Main Authors: Vagif Shykhy ogly Gurbanov, Latif Agamirza ogly Sultanov
• Format: Article
• Language: English
• Published: Perm National Research Polytechnic University 2015-09-01
• Series: Perm Journal of Petroleum and Mining Engineering
• Subjects: Mesozoic; oil and gas accumulation; lithofacies; graphic-analytical; reservoir; density; porosity; carbon content; primary wave rate; Terrigenous-carbonate; petrophysics; depression; drilling; geophysics; reef
• Online Access: http://vestnik.pstu.ru/get/_res/fs/file.pdf/4907/On+oil-and-gas+content+of+Mesozoic+deposits+in+Azerbaijanfile.pdf

For many decades the leading geologists and petroleum experts have investigated the oil-and-gas content of Azerbaijan's Mesozoic deposits. Survey and exploration of the Mesozoic deposits brought about some considerable results. In 1940-1950 in Pricaspian-Guba oil and gas field significant oil-gas influx rate was acquired due to Kulaly sandstone of the Middle Albian (at present commercial production is in progress) Later, in the same region commercial gas influx was obtained from the Middle Jurassic. In the Yevlakh-Aghjabadi depression of the Upper Cretaceous commercial oil influx of effusive and carbonate type was acquired. Intensive Mesozoic drilling and commercial oil influx rates, however, do not testify to the full discovery of the general oil-and-gas content criteria: lithofacies changes, reservoir architecture and seal, oil-and-gas content of certain section intervals, the placement of the structures relatively to the migration of hydrocarbons etc. The structures selected for scout drilling by seismic survey by a common depth point method mainly reflect the erosion surface of the Mesozoic deposits, while the structure of the Mesozoic complex itself remains unknown. Exploration within the North-Absheron depression was performed to no avail. In the Shamakhi-Gobustan oil and gas field a Mesozoic structural level in the Central and Southern Gobustan is located at the big depth; yet, their geophysical investigation is essential. The structures of the Northern Gobustan are thought to be good. A definite output is expected from carbonate chalk deposits within the fluve of Kura and Iori. The analysis of the data generated by oilfield geophysics has demonstrated that only the upper Cretaceous areas have been explored, while the structure of the Mesozoic demands further research. In this context, special survey and seismic operations have to be arranged in the promising areas to prepare the Mesozoic structures for scout drilling.