oa Estimation of the pore space structure of tight gas reservoirs of the Moscovian stage locates in DDB Eastern part using a limited well logging dataset

During the exploration, productive intervals identification, and development of tight gas reservoirs fields, an important part is the accurate determination of the capacity, and the structure of the pore space.

For the first time, the technique of Prodaivoda G., Vyzhva S. and Bezrodna I. was used for determining the pore structure of the tight gas reservoirs (porosity cutoff is 4%).

The authors have synthetically generated bulk density and S-wave velocity logs through the multi-mineral model and using the Greenberg-Castagna equation.

According to a limited of well logging dataset, the authors have determined the tight gas reservoirs pore structure of the Moscovian stage in the Spivakivskyi gas-bearing region which locates in the Eastern part of the DDB.

It is established that the void space of the investigated gas reservoirs is mainly composed of tight pores (PHI,tight - 4–7.8%). Fractures are in the intervals of 4136.9–4137.1 m and 4127.9–4128.6 m and PHI,fr is 0.25% and 0.1% respectively. Intergranular pores are almost absent, but in some intervals PHI, int.gr is 0.1–0.9%.

Estimation of the space structure of the given rock intervals provides additional valuable information for further wells stimulation in order to obtain hydrocarbon inflows.

Keywords: tight gas, reservoir, space pore structure, well logging.