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Methodical approaches to the reserves and resources estimation of Bazhenov formation

UDK: 553.98.04
DOI: 10.24887/0028-2448-2017-3-28-32
Key words: volumetric method, geochemistry, Rock-Eval, hard-to-recover reserves, petroleum reserves and resources estimation, Bazhenov formation
Authors: I.S. Gutman, G.N. Potemkin, A.V. Postnikov, O.V. Postnikova (Gubkin Russian State University of Oil and Gas (National Research University), RF, Moscow), E.V. Kozlova (Skolkovo Institute of Science and Technology, RF, Moscow), A.D. Alekseev, I.A. Karpov (Gazpromneft NTC LLC, RF, Saint-Petersburg)

The article concerns the problem of quantitative hydrocarbons evaluation of Bazhenov formation itself. Geological features of formation are defined basing on integrated multy-scale study. The formation has complex mineral a lithological composition and void media and it has vertical heterogeneity. Three zonal intervals could be allocated for studied area using lithological, geophysical, petrophysical and geochemical data. In the context of development by proven technology, the most important objects are fine-grained siliceous and carbonate layers located in middle and lower zonal intervals and layers with high concentration of pelecypod shells in middle interval.

Differentiation of estimation target in reliance on dominated petroleum occurrence forms is crucial for the concerning formation. Different approaches should be implemented for similar to traditional reservoirs intervals, for rocks containing petroleum in isolated porosity, and for source rocks. Quantitive reserves and resources estimations of kerogen-containing rocks based on pyrolytic parameters should be controlled by volumetric method of evaluation. Objective reserves values could be obtained using pyrolysis before and after extraction and consider dependence between parameters and sample volume.

Volumetric method should be applied for the traditional reservoirs within Bazhenov formation, and it is possible to use pyrolytic estimates for stimulated rocks. We recommend that reserves categories should be defined for the both types of rocks in accordance with RF Classification (2013), but with some specifications described in the article.

References

1. Postnikov A.V., Postnikova O.V., Olenova K.Yu. et al., Different-scale investigations

of geological heterogeneity of Bazhenov formation in terms of

hydrocarbon potential evaluation (In Russ.), Neftyanoe khozyaystvo = Oil

Industry, 2017, no. 3, pp. 8–11.

2. Gutman I.S., Potemkin G.N., Balaban I.Yu. et al., Volumetric control for

hydrocarbon resources estimations based on geochemical laboratory

measurements (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2016, no. 9,

pp. 12–17.

3. Kozlova E.V., Spasennykh M.Yu., Kalmykov G.A. et al., Balance of the petroleum

hydrocarbon compounds in pyrolyzed organic matter of the

Bazhenov formation (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2017,

no. 3, рр. 18–21.

4. Alekseev A.D., Antonenko A.A., Zhukov V.V. et al., The differentiated approach

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

SPE 182074-RU, 2016.

5. Gutman I.S., Postnikov A.V., Postnikova O.V. et al., Methodical approach

to vertical zonation of bazhenov formation in relation to resources evaluation

(In Russ.), Nedropol'zovanie XXI vek, 2016, no. 6, pp. 80–87.

6. Petersil'e V.I., Komar N.V., The algorithm for shale oil reserves assessment

with volumetric methods (In Russ.), Geologiya nefti i gaza = The journal Oil

and Gas Geology, 2016, no. 5, pp. 95–101.

7. 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.

The article concerns the problem of quantitative hydrocarbons evaluation of Bazhenov formation itself. Geological features of formation are defined basing on integrated multy-scale study. The formation has complex mineral a lithological composition and void media and it has vertical heterogeneity. Three zonal intervals could be allocated for studied area using lithological, geophysical, petrophysical and geochemical data. In the context of development by proven technology, the most important objects are fine-grained siliceous and carbonate layers located in middle and lower zonal intervals and layers with high concentration of pelecypod shells in middle interval.

Differentiation of estimation target in reliance on dominated petroleum occurrence forms is crucial for the concerning formation. Different approaches should be implemented for similar to traditional reservoirs intervals, for rocks containing petroleum in isolated porosity, and for source rocks. Quantitive reserves and resources estimations of kerogen-containing rocks based on pyrolytic parameters should be controlled by volumetric method of evaluation. Objective reserves values could be obtained using pyrolysis before and after extraction and consider dependence between parameters and sample volume.

Volumetric method should be applied for the traditional reservoirs within Bazhenov formation, and it is possible to use pyrolytic estimates for stimulated rocks. We recommend that reserves categories should be defined for the both types of rocks in accordance with RF Classification (2013), but with some specifications described in the article.

References

1. Postnikov A.V., Postnikova O.V., Olenova K.Yu. et al., Different-scale investigations

of geological heterogeneity of Bazhenov formation in terms of

hydrocarbon potential evaluation (In Russ.), Neftyanoe khozyaystvo = Oil

Industry, 2017, no. 3, pp. 8–11.

2. Gutman I.S., Potemkin G.N., Balaban I.Yu. et al., Volumetric control for

hydrocarbon resources estimations based on geochemical laboratory

measurements (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2016, no. 9,

pp. 12–17.

3. Kozlova E.V., Spasennykh M.Yu., Kalmykov G.A. et al., Balance of the petroleum

hydrocarbon compounds in pyrolyzed organic matter of the

Bazhenov formation (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2017,

no. 3, рр. 18–21.

4. Alekseev A.D., Antonenko A.A., Zhukov V.V. et al., The differentiated approach

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

SPE 182074-RU, 2016.

5. Gutman I.S., Postnikov A.V., Postnikova O.V. et al., Methodical approach

to vertical zonation of bazhenov formation in relation to resources evaluation

(In Russ.), Nedropol'zovanie XXI vek, 2016, no. 6, pp. 80–87.

6. Petersil'e V.I., Komar N.V., The algorithm for shale oil reserves assessment

with volumetric methods (In Russ.), Geologiya nefti i gaza = The journal Oil

and Gas Geology, 2016, no. 5, pp. 95–101.

7. 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.



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