Afanas'eva M.A.

Graduated from the Gubkin Russian State University of Oil and Gas (National Research University) (2006), specialization "geoecology".
Associate Professor, Department of General and Oil and Gas Geology, Gubkin Russian State University of Oil and Gas (National Research University).
Area of scientific interests: paleogeographic and paleontological studies of the Caspian region, the genesis and search for hard-to-recover hydrocarbon resources, the study of subaquatic paleohydrates in the Phanerozoic.
Has 20 publications.
Stratigraphy and lithology
Article # 51_2022 submitted on 10/31/2022 displayed on website on 12/26/2022
18 p.
pdf Steadiness of the distribution of residual oil in the delta sequences of the Paleogene system of the Bohai Bay basin
The deltas developed widely in several faulted basins in China. As a kind of important oil and gas reservoir, it is very necessary to make clear the internal architecture for prediction of the residual oil distribution in the late period of oilfield development.Therefore taking the 5th oil productive level of Kongdian Formation in the faulted block 195 of Y oil field as an example the reservoir architecture of delta front was characterized quantitatively based on core data well logs and production data.The main reservoir architecture elements off an delta front consists of distributary channel, estuary sandbar, sheet sand and inter channel.The division scheme was established for the division of reservoir architecture of delta front into different levels and the markers was defined for the identification of distributary channel estuary sandbar and inner accretion body in estuary sandbar.Taking single sandbody as a unit data being acquired from field outcrop defined as delta in the Xiguayuan Formation of Luanping Basin were matched to derive a formula for quantitative characterization of distributary channel and estuary sandbar, calculation of the dip of interbed innerestuary sandbar and prediction of the development of inner accretion body.The residual oil controlled by a single genetic sand body distributes at the top of the margin of sandbars and channels and the distribution of residual oil controlled by the interlayer should be analyzed according to the specific rhythm of the sandbar.

Keywords: delta sequence, hydrocarbon reservoir, Paleogene, distribution of the residual oil, Bohai Bay basin, China.
article citation Afanas'eva M.A., Chzhan Ee. Zakonomernosti raspredeleniya ostatochnoy nefti v del'tovykh otlozheniyakh paleogenovoy sistemy basseyna Bokhayskogo zaliva [Steadiness of the distribution of residual oil in the delta sequences of the Paleogene system of the Bohai Bay basin]. Neftegazovaya Geologiya. Teoriya I Praktika, 2022, vol. 17, no. 4, available at:
Chen C., Sun Y., Jia A. Development and application of geological knowledge database for fan-delta front in the dense spacing area. ActaPetroleiSinica, 2006, 27(2), pp. 53-57.
Guo J., Jia A., He D. Sequence stratigraphy of upper Jurassic-Lower Gretaceous fan-delta outcrops in Luan-ping. Geology in China, 2007, 34(4), pp. 628-635.
Jia A., He D., He W. Application of outcrop geological knowledge database to prediction of inter well reservoir in oilfield. ActaPetrolei Sinica, 2003, 24(6), pp. 51-53.
Liu Y., Hou J., Wang L. Architecture analysis of braided river reservoir. Journal of China University of Petroleum: Edition of Natural Science, 2009, 33(1), pp. 7-11.
Miall A.D. Geology of fluvial deposits: Sedimentary faces, basin analysis and petroleum geology. New York: Springer-Verlag, 1996, pp. 57-98.
Wang X., Hou J., Liu Y. Studying reservoir heterogeneity by analytic hierarchy process and fuzzy logic, case study of Es1x formation of the Wangguantun oilfield, China. Journal of Petroleum Science & Engineering, 2017, 156(6), pp. 858-867.
Wen L., Wu S., Wang Y. An accurate method for anatomizing architecture of subsurface reservoir in mouth bar of fluvial dominated delta. Journal of Central South University: Science and Technology, 2001, 42(4), pp.1072-1078
Wu S., Ji Y., Yue D. Discussion on hierarchical scheme of architectural units in clastic deposits. Geological Journal of China Universities, 2013, 19(1), pp. 12-22.
Xia Q., Wu S., Feng W. Remaining oil distribution patterns controlled by mouthbar reservoir architecture. Complex Hydrocarbon Reservoirs, 2015, 8(2), pp. 41-45.
Xie J., Hu W., Chen S. Reservoir architectural analysis of the braided fluvial delta of the lower oil layer in the 1st block of Tahe oil field. Petroleum Geology and Recovery Efficiency, 2017, 24(5), pp. 46-52.
Xu A., Mu L., Qiu Y. Distribution pattern of OOIP and remaining mobile oil CM (83mm) in different types of sedimentary of China. Petroleum Exploration and Development, 1998, 25(5), pp. 41-44.
Yan B., Zhang X., Yu L. Point bar configuration and residual oil analysis based on core and dense well patern. Petroleum Exploration and Development, 2014, 41(5), pp. 597-604.
Zhou X., Gao X., Tian C. Quantitative description of internal architecture in point bar of meandering river. Natural Gas Geoscience, 2010, 21(3), pp. 421-426.