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Bazhen Formation Rocks Heterogeneity Characteristic Based on Changes of Sedimentation Cycles of Mineral Composition

Authors: Maria A. SREBRODOLSKAYA graduated from the Gubkin Russian State University of Oil and Gas in 2013, with Master Degree in Petroleum Engineering of Gubkin Russian State University of Oil and Gas (National Research University). She is postgraduate student doing research in geological and mineralogical sciences, focusing petrophysics, log data processing in complicated reservoirs, well logging in horizontal wells. She is author of more than 40 scientific papers. E-mail: mary_roza@bk.ru
Andrey D. SREBRODOLSKY graduated from Gubkin Moscow Institute of Petrochemical and Gas Industry in 1975. He is Candidate of Geological and Mineralogical Sciences, senior lecturer of the Department of Petrophysics of Gubkin Russian State University of Oil and Gas (National Research University). His research interests include log data processing technologies, quantitative evaluation of anomalous reservoir pressures, including those in the Bazhen Formation. He is author of more than 60 scientific publications and 2 copyright certificates. E-mail: gis-sad@list.ru
Valentina A. KOSTERINA graduated from Gubkin Moscow Institute of Petrochemical and Gas Industry in 1970. She is candidate of Geological and Mineralogical sciences. Senior Researcher of the Department of Petrophysics of Gubkin Russian State University of Oil and Gas (National Research University). She is specializes in the studies of complex oil and gas reservoirs by well log methods. She is author of more than 50 scientific papers. E-mail: kosterinava@mail.ru

Abstract: Bazhen Formation cyclic structure is explained and mineral composition heterogeneity of these deposits is characterized. Histograms of distribution of main rocks components weights incl. kerogen, kerogen volume, coefficients of total and open porosity in sedimentation cycles are analyzed. The regularities of the organic material (kerogen) distribution are considered in detail, depending on the sedimentation cycle and carbonate material concentration. Histograms of distribution of gamma-ray index in Salym oilfield wells in sedimentation cycles are described. The features of the lithological structure and mineral composition of each of the three cycles are identified and described. The conclusions about the advisability of creating a differentiated approach to Bazhen Formation sediments interpretation model are made in order to reduce errors in determining the total porosity values

Index UDK: 550.8.056

Keywords: вazhen formation, sedimentation cycles, distribution histogram analysis, kerogen volume, Salym field

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