Upper Devonian carbonate deposits seals composition Volga-Ural region and the method of their identification based on well logging data

Nigmatzyanova A.M. RN-BashNIPIneft LLC Ufa
Mirnov R.V. RN-BashNIPIneft LLC Ufa
Burikova T.V. RN-BashNIPIneft LLC Ufa
Bakirov R.D. RN-BashNIPIneft LLC Ufa
Shavaliev V.I. RN-BashNIPIneft LLC Ufa
DOI: 10.24412/2076-6785-2022-2-31-36

Abstract
The Upper Devonian deposits of the Volga-Ural oil and gas province are promising for oil exploration. An important factor in predicting the development of traps is the presence or absence of seal rocks. The relevance of the topic is the ability to predict the distribution of seal rocks using well logging methods and, consequently, increase the efficiency of exploration work. The article presents a technique for separating fluid seals from well log data, based on lithological study of the core and confirmed by test results. As a result of the analysis, boundary values were obtained for various geophysical parameters, which make it possible to distinguish impermeable strata.

Materials and methods
The technique was created on the basis of data from 15 deposits of the Volga-Ural region, more than 500 linear meters were studied core from non-reservoir intervals. Wells with a direct sign of the presence of a seal were taken as reference: where, according to the results of testing, below the interval of development of the seal, oil was obtained,
and above formation water. Lithological differentiation was carried out on the basis of logging methods, the thickness was determined, and the main parameters were calculated.

Keywords
seals, Upper Devonian deposits of the Volga-Ural oil and gas province, geophysical parameters, limestones
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