изложены основные результаты литолого-фациальных исследований пород бобриковского горизонта, основанных на обработке материалов бурения последних лет. Приводится анализ существующих представлений об условиях формирования терригенного нижнего карбона. установлено, что формирование терригенных коллекторов в бобриковское время происходило в морских условиях. Ключевые слова: литология, обстановки осадконакопления, бобриковский горизонт, юговосток русской плиты. Depositional Environment inBobrikovsky time within the south-east of the Russian Plate s. V. Astarkin, о. P. Goncharenko, M. V. Pimenov The main results of lithology and facies investigations of the Bobrikovskian reservoir rocks material are based on processing drilling in recent years. The analysis of the existing ideas about the conditions of formation of the Lower Carboniferous terrigenous beds. It has been established that formation of terrigenous rocks in Bobrikovsky time had occurred in marine environment.

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Проведено комплексное седиментологическое исследование нефтеносного пласта Юв 1 1 в пределах юго-восточной части Ярсомовского участка. установлено, что верхнеюрские отложения в пределах территории изучения представлены прибрежноконтинентальными и прибрежно-морскими фациями. на основе выполненных палеогеографических реконструкций, детальных структурных построениях по кровле пласта Юв 1 1 , анализа результатов испытания скважин, распределения петрофизических свойств в отдельных субобстановках построена карта прогноза эффективных коллекторов пласта Юв 1 1 на изученной территории. Ключевые слова: обстановки осадконакопления, коллекторы, нефтегазоносность, пласт Юв 1 1 , Западная Сибирь. sedimentation Model of the Upper Jurassic Productive Beds from the southeast of the Yarsomovskij site о. P. Goncharenko, s. n. Dzhoni, s. V. AstarkinComplex sedimentologic examination of the JV 1 1 oil-bearing bed has been made within the southeastern part of the Yarsomovskij site. The Upper Jurassic beds within the study area were found to be represented by coastal-continental and coastal-marine facies. Paleogeographic reconstructions, detailed structural imaging from the top of the JV 1 1 layer, analyses of the well-test results and of the petrophysical properties distributions in selected sub-environments were used to construct a forecast map of effective reservoirs in the JV 1 1 layer within the study area.

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Оbject.The article presents the results of studies of secondary mineral formation in the lower Cretaceous sediments of the Bolshekhetskaya depression, which contain highly promising oil and gas deposits, with established industrial performance at Pyakyakhinskoye, Khalmerpayutinskoye and South-Messoyakhskoye fields. The objects under consideration are located in the most submerged part of the Nadym-Taz syneclise in the zone, where the Taz and Urengoy facies regions meet.Materials and methods.Main types of postsedimentary changes of reservoir rocks selected on the basis of study of core material Pokurskaya, Angelovskaya, Sortymskaya and Megionskaya fms. Petrography and Mineralogy of the rocks under consideration were studied on the basis of stage analysis using optical and electron microscopy, and X-ray diffraction study at the Center of core and reservoir fluids research of “LUKOIL-Engineering’s KogalymNIPIneft branch In Tyumen” (Kogalym). Determination of the mineral type of zeolite was performed by X-ray phase analysis at the Institute of Geology and Geochemistry UrO RAS (Ekaterinburg).Resuts.It was found that for rocks Pokurskaya, Angelovskaya, Sortymskaya and Megionskaya fms characteristic a diverse range of secondary minerals and structures, evidence of the background stage catagenesis and the superimposed processes. The most important among them is the regeneration of quartz, the transformation of feldspar, violation of the crystal structure of biotite, the formation of various clay minerals, crystallization of zeolites and calcite.Conclusions.Studies show that the upper part of the section of the lower Cretaceous deposits of Bolshekhetskaya depression corresponds to the area of the middle catagenesis (gradation MK2), the bottom – changed to the stage of deep catagenesis (gradation MK3). In this case, the epigenetic process proceeded unevenly, pulsation, due to changing tectonic conditions. Particular attention is paid to the origin of zeolites, which is still debatable. It is assumed that their formation is associated with the transformation of “camouflage pyroclastic” in particular, feldspar clastics.