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Conceptual sedimentological model of clastic-carbonate Frasnian section on Chinarevskoye field (Kazakhstan)

UDK: 519.868:55
DOI: 10.24887/0028-2448-2019-10-14-18
Key words: Northern margin of Pre-Caspian basin, facies analysis, sedimentological model, fan, distributary
Authors: K.O. Iskaziev (National Company KazMunayGas JSC, Kazakhstan, Astana), S.F. Khafizov (Gubkin University, RF, Moscow), N.V.Taninskaya (Geologorazvedka JSC, RF, Saint-Petersburg)

Middle-Upper Frasnian clastic-carbonate sequence is the new prospect on the Northern margin of Pre-Caspian depression. Kolgan unit, quite well explored in Orenburg region, could be thought of as its analog. In Kazakhstan interest to this subject had appeared after oil discovered on Chinarevskoye field. Frasnian clastic-carbonate sequence has the limited areal distribution which is because of specific sedimentological environment. Lithotypes were described in both carbonate and clastic parts, facial zonation identified, detail lithological and petrophysical characteristics given and sedimentological model proposed based on regional data, well log interpretation and core study from three wells drilled in the Northern part of Chinarevskoye field. In the result of well testing it’s found that the reservoirs are practically absent in the carbonate part therefore the main attention is paid to identification the reservoirs association with the clastic faces. Based on petrophysical parameters of different Frasnian clastic lithotypes it’s possible to conclude that in the Northern part of Chinarevskoye field the fans proximal part as well as distributary are the most promising facies for reservoir formation. Seism facies and attribute analysis of 3D seismic calibrated on the well data was used for forecasting subsurface geology in interwell space and outline zones with maximum sands in the section. Sand bodies geometry obtained from the different maps is consistent with proposed sedimentological model.

References

1. Afanas'eva M.A., Geologicheskoe stroenie i perspektivy otkrytiya novykh mestorozhdeniy nefti i gaza v devonskikh otlozheniyakh Buzulukskoy vpadiny (Geological structure and prospects for the discovery of new oil and gas deposits in the Devonian sediments of the Buzuluk depression): thesis of candidate of geological and mineralogical science, Moscow, 2011.

2. Muromtsev V.S., Elektricheskie modeli fatsiy i paleogeograficheskie rekonstruktsii usloviy formirovaniya shel'fov drevnikh morey Shirotnogo Priob'ya Zapadnoy Sibiri (Electric facies models and paleogeographic reconstructions of shelf formation conditions of the ancient seas of the Latitudinal Ob region of Western Siberia), Leningrad: Publ. of VNIGRI, 1984, pp. 106–121.

3. Nikitin Yu.I., Rikhter O.V., Vilesov A.P., Makhmudova R.Kh., Structure and formation conditions of the Kolganian suite on the south of the Orenburg region (In Russ.), Neftegazovaya geologiya. Teoriya i praktika, 2014, no. 2, URL: http://www.ngtp.ru/ rub/4/21_2014.pdf

4. Taninskaya N.V., Shimanskiy V.V., Ostapenko S.V. et al., Usloviya formirovaniya klinoformnykh kompleksov kolganskoy tolshchi Vakhitovskogo mestorozhdeniya yuga Orenburgskoy oblasti (Conditions for the formation of clinoform complexes of the Kolgan strata of the Vakhitovskoye deposit in the south of the Orenburg region), In: Nestrukturnye, slozhnopostroennye lovushki – osnovnoy rezerv prirosta uglevodorodnogo syr'ya Rossii (Non-structural, complex-built traps are the main reserve of growth in the volume of hydrocarbon raw materials in Russia), St. Petersburg: Nedra Publ., 2005, pp. 74–82.

Middle-Upper Frasnian clastic-carbonate sequence is the new prospect on the Northern margin of Pre-Caspian depression. Kolgan unit, quite well explored in Orenburg region, could be thought of as its analog. In Kazakhstan interest to this subject had appeared after oil discovered on Chinarevskoye field. Frasnian clastic-carbonate sequence has the limited areal distribution which is because of specific sedimentological environment. Lithotypes were described in both carbonate and clastic parts, facial zonation identified, detail lithological and petrophysical characteristics given and sedimentological model proposed based on regional data, well log interpretation and core study from three wells drilled in the Northern part of Chinarevskoye field. In the result of well testing it’s found that the reservoirs are practically absent in the carbonate part therefore the main attention is paid to identification the reservoirs association with the clastic faces. Based on petrophysical parameters of different Frasnian clastic lithotypes it’s possible to conclude that in the Northern part of Chinarevskoye field the fans proximal part as well as distributary are the most promising facies for reservoir formation. Seism facies and attribute analysis of 3D seismic calibrated on the well data was used for forecasting subsurface geology in interwell space and outline zones with maximum sands in the section. Sand bodies geometry obtained from the different maps is consistent with proposed sedimentological model.

References

1. Afanas'eva M.A., Geologicheskoe stroenie i perspektivy otkrytiya novykh mestorozhdeniy nefti i gaza v devonskikh otlozheniyakh Buzulukskoy vpadiny (Geological structure and prospects for the discovery of new oil and gas deposits in the Devonian sediments of the Buzuluk depression): thesis of candidate of geological and mineralogical science, Moscow, 2011.

2. Muromtsev V.S., Elektricheskie modeli fatsiy i paleogeograficheskie rekonstruktsii usloviy formirovaniya shel'fov drevnikh morey Shirotnogo Priob'ya Zapadnoy Sibiri (Electric facies models and paleogeographic reconstructions of shelf formation conditions of the ancient seas of the Latitudinal Ob region of Western Siberia), Leningrad: Publ. of VNIGRI, 1984, pp. 106–121.

3. Nikitin Yu.I., Rikhter O.V., Vilesov A.P., Makhmudova R.Kh., Structure and formation conditions of the Kolganian suite on the south of the Orenburg region (In Russ.), Neftegazovaya geologiya. Teoriya i praktika, 2014, no. 2, URL: http://www.ngtp.ru/ rub/4/21_2014.pdf

4. Taninskaya N.V., Shimanskiy V.V., Ostapenko S.V. et al., Usloviya formirovaniya klinoformnykh kompleksov kolganskoy tolshchi Vakhitovskogo mestorozhdeniya yuga Orenburgskoy oblasti (Conditions for the formation of clinoform complexes of the Kolgan strata of the Vakhitovskoye deposit in the south of the Orenburg region), In: Nestrukturnye, slozhnopostroennye lovushki – osnovnoy rezerv prirosta uglevodorodnogo syr'ya Rossii (Non-structural, complex-built traps are the main reserve of growth in the volume of hydrocarbon raw materials in Russia), St. Petersburg: Nedra Publ., 2005, pp. 74–82.


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