Ph.D. Theses

Morphostructural studies of the mud volcanoes in Gobustan using GIS technology (in connection with oil-and-gas content)

Rashidov Tofig Mirzaga

2521.01 - Geology, search and exploration of oil and gas fields

The main part of the present study is dedicated to the scientific substantiation of the structures productivity and connection with the mud volcanoes dimensions that complicate them using the up-to-date technologies like GIS, 3D modeling, remote sensing and satellite images analysis. The aims of the studies were the revealing of interrelation of the murphostructural peculiarities of the mud volcanoes in Gobustan and the degree of productivity of the oil and gas structures using the GIS technology.

Some volcanoes in the South Gobustan region (Beyuk Kanizadag, Toragay, Dashgil, Ayranteken, Bakhar, Dashmardan, Goturdag) as well as from the neighbor areas – Baku archipelago (Zenbil Island, Khare-Zire Island), Absheron peninsula (Lokbatan), Lower Kura region (Galmaz) had been selected to perform the specified tasks. One of the main factors is that all the objects occur on the Productive Series. Using the GIS technology (ArcMap application) 3D models of the mentioned volcanoes had been compiled as well as the calculation of volumes of mud volcanic structures had been made. In addition, the profiles through the volcanoes had been given as well as the structural maps of the fields complicated by the mud volcanoes. Based on the performed calculations of the mud volcanoes volumes the selected objects had been divided into two groups – small and big. The group of small volcanoes includes Zenbil Island, Bakhar, Lokbatan, Khare-Zire Island, Dashgil. The group of big volcanoes includes Galmaz, Goturdag, Toragay, Beyuk Kanizadag, Dashmardan and Ayranteken.

Analysis of the given data shows that the structures, complicated by the mud volcanoes, are clearly divided into two groups according to the character of their relation with oil and gas shows and the volcanoes morphostructure. Then, the oil and gas bearing structure are those that enclose small mud volcanoes. They form the first group. In these fields the hydrocarbon pools directly join to the mud volcanic canals or locate close to them.

The second group includes the structures complicated by the large volcanoes. The specific feature of these structures is that they are not productive near the mud volcanic canals or the reservoir limits locate far from the canal and hydrocarbons fields are mostly gas, and rarely gascondensate.

The forming of large morphostructures of the mud volcanoes requires the great energy spent by the mud volcanic system. As a result, the zone of dynamic influence around the eruptive channel will be many times as large as when forming of relatively small volcanoes. It means that the probability of destruction of fields, formed earlier, is higher in structures enclosing the big volcanoes than small ones. In other words, the conditions of hydrocarbons preservations in such structures is extremely unfavorable. It seems it us that one should lead these morphostructural criteria when assessing the possibilities and scheduling the prospecting activities in the South Caspian.