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Experience of integration of potential field methods and surface geochemistry in the context of exploration planning within underexplored areas of the Bazhenov formation

UDK: 550.84
Key words: The Bazhenov formation, source rocks, unconventional reservoir, granite trutii, high-resolution seismic surveys, detailed gravity and magnetic work, geochemical studies
Authors: A.A. Vashkevich (Gazprom Neft PJSC, RF, Saint-Petersburg), K.V.Strizhnev, S.I. Chekmarev (Gazpromneft-Angara LLC, RF, Saint-Petersburg), D.E. Zagranovskaya, A.S. Bochkov, V.V. Zhukov (Gazpromneft NTC LLC, RF, Saint-Petersburg), Yu.L. Zuikova, N.F. Skopenko (RosGeofizika CJSC, RF, Saint-Petersburg)


References

1. Patent no. 2428723 RF, Method of searching for hydrocarbon deposits in bituminous

argillaceous deposits, Inventors: Korobov A.D., Korobova L.A.

2. Alekseev A.D., Antonenko A.A., Zhukov V.V., Strizhnev K.V., The differentiated

approach of the reserves estimation for source rock formations (In Russ.),

SPE 182074, 2016.

3. Patent no. 2596181 RF, Method of searching for hydrocarbon deposits in

non-conventional reservoir rocks of Bazhenov group, Inventors: Vashkevich

A.A., Strizhnev K.V., Zagranovskaya D.E., Zhukov V.V.

4. Strizhnev K.V, Zagranovskaya D.E., Zhukov V.V., Selection of promising oil

and gas bearing area formations for unconventional reservoirs Bazhenov

Suite (In Russ.), Nedropol'zovanie XXI vek, 2015, no. 1, pp. 46 - 51.

5. Slepak Z.M., Gravirazvedka v neftyanoy geologii (Gravity prospecting in

petroleum geology), Kazan': Publ. of KSU, 2005, 224 p.

According to the authors, one of the important processes that have made their contribution to the formation of secondary porosity in the Bazhenov rocks are the epigenesis processes. Keeping in mind that these processes are related to the development of high reservoir properties of productive rocks, their importance for the prediction of promising areas where free oil may occur is significant. Unconventional reservoirs with mobile hydrocarbons are confined to weakened zones of the sedimentary mantle where oil generation is caused by conditioned heating related to certain hydrothermal-metasomatic processes in the basement rocks and structural features of the sedimentary mantle while boundaries of non-structural traps are defined by decompression zones. The exploration methods that can be used in a license block should be in accordance with the amount of geologic information available and determine target parameters for further more detailed and expensive explorations such as high-resolution 3D seismics and exploratory drilling.

The paper analyses the relevance of the obtained exploration results as well as the applicability of high-precision geophysical methods, such as detailed gravimetric and magnetic surveying and areal geochemical surveying, to identify unconventional and non-structural traps. The reason for integrating potential field data with seismic data is determined by the fact that information obtained by each of these methods has its specific characteristics. Anomalies of potential fields related to magnetic and density properties of rocks reflect, first of all, their composition and superimposed processes (tectonic impacts, hydrothermal-metasomatic changes, etc.) which allows obtaining data on physical characteristics of the geological environment in addition to seismic data that are crucial, mainly, to study structural features. Second, gravitational and magnetic fields anomalies are caused, primarily, by high-angle boundaries while the seismic method, in contrast, is focused on tracking low-angle boundaries. It means that these two methods may complement each other helping identify subvertical tectonic and subhorizontal lithological and stratigraphic boundaries.В  В В 


References

1. Patent no. 2428723 RF, Method of searching for hydrocarbon deposits in bituminous

argillaceous deposits, Inventors: Korobov A.D., Korobova L.A.

2. Alekseev A.D., Antonenko A.A., Zhukov V.V., Strizhnev K.V., The differentiated

approach of the reserves estimation for source rock formations (In Russ.),

SPE 182074, 2016.

3. Patent no. 2596181 RF, Method of searching for hydrocarbon deposits in

non-conventional reservoir rocks of Bazhenov group, Inventors: Vashkevich

A.A., Strizhnev K.V., Zagranovskaya D.E., Zhukov V.V.

4. Strizhnev K.V, Zagranovskaya D.E., Zhukov V.V., Selection of promising oil

and gas bearing area formations for unconventional reservoirs Bazhenov

Suite (In Russ.), Nedropol'zovanie XXI vek, 2015, no. 1, pp. 46 - 51.

5. Slepak Z.M., Gravirazvedka v neftyanoy geologii (Gravity prospecting in

petroleum geology), Kazan': Publ. of KSU, 2005, 224 p.

According to the authors, one of the important processes that have made their contribution to the formation of secondary porosity in the Bazhenov rocks are the epigenesis processes. Keeping in mind that these processes are related to the development of high reservoir properties of productive rocks, their importance for the prediction of promising areas where free oil may occur is significant. Unconventional reservoirs with mobile hydrocarbons are confined to weakened zones of the sedimentary mantle where oil generation is caused by conditioned heating related to certain hydrothermal-metasomatic processes in the basement rocks and structural features of the sedimentary mantle while boundaries of non-structural traps are defined by decompression zones. The exploration methods that can be used in a license block should be in accordance with the amount of geologic information available and determine target parameters for further more detailed and expensive explorations such as high-resolution 3D seismics and exploratory drilling.

The paper analyses the relevance of the obtained exploration results as well as the applicability of high-precision geophysical methods, such as detailed gravimetric and magnetic surveying and areal geochemical surveying, to identify unconventional and non-structural traps. The reason for integrating potential field data with seismic data is determined by the fact that information obtained by each of these methods has its specific characteristics. Anomalies of potential fields related to magnetic and density properties of rocks reflect, first of all, their composition and superimposed processes (tectonic impacts, hydrothermal-metasomatic changes, etc.) which allows obtaining data on physical characteristics of the geological environment in addition to seismic data that are crucial, mainly, to study structural features. Second, gravitational and magnetic fields anomalies are caused, primarily, by high-angle boundaries while the seismic method, in contrast, is focused on tracking low-angle boundaries. It means that these two methods may complement each other helping identify subvertical tectonic and subhorizontal lithological and stratigraphic boundaries.В  В В 



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