Commercial significance of the majority of Western Siberian oil fields is concerned with the Senomanian, Neocomian and, above all, Upper Jurassic horizons. For now, oil fields are at the late development stage and resource potential of the Jurassic horizon is strongly expired. Commercial potential of the pre-Jurassic (Paleozoic) rocks has been brought out throughout all territory of oil and gas province. Extensive work on estimation of the pre-Jurassic rocks oil and gas potential is performed in southeast, in the territory of Tomsk Region, within which 13 hydrocarbon deposits have been discovered in the Paleozoic. Original hypothesis of anomalousness of geophysical and petrophysical characteristics of the Jurassic layers — uniqueness of «indication» the Paleozoic deposits in geophysical parameters of overlaying Mezozoic-Cenozoic section was stated as a foundation of new prospecting criterion for the Paleozoic deposits. The Paleozoic formations are accepted as a complex with its own oil generating potential, which results in upward migration of hydrocarbon fluids. Additionally, downward direction of vertical interstratal hydrocarbon migration from the Jurassic source rocks into the pre-Jurassic complex is brought out. It was accepted as a conception that as in case of upward, so in case of downward fluid migration, processes of superposed epigenesis perform and lead to secondary epigenetic transformations of rocks of transit Jurassic layers, which result in their anomalous geophysical and petrophysical characteristics. This paper analyzes and compares geophysical and petrophysical characteristics of the Jurassic layers of different field types in Tomsk Region: without oil and gas potential in pre-Jurassic section, with commercial inflows from the pre-Jurassic complex and unknown type. Results of exploration electrical resistivity and carbonatization in the Jurassic layers of 200 wells and also spontaneous potential variation, electrical resistivity and natural radioactivity in Bazhenov suite confirm anomalousness of geophysical and petrophysical parameters of Jurassic rocks in case of pre-Jurassic deposits. This paper determines 6 geophysical and petrophysical characteristics of the Jurassic layers as predictive indicators for oil and gas potential estimation in pre-Jurassic section. Efficiency analysis of using predictive indicators for bringing out fields with and without deposits in the pre-Jurassic complex was performed for different prospecting cases in the research territory with account taken of possible complexing of indicators, their rank and actual availability. This paper states preference of indicators complexing. Application of a new prospecting criterion will improve efficiency of searching in new prioritized stratigraphic horizon — the Paleozoic, which contains unconventional oil.
Study and exploration of the pre-Jurassic oil and gas complex in Western Siberia is one of the aspects of hydrocarbon raw-material base development. The main scope of this study is to locate the source of Paleozoic hydrocarbons. The problem of modeling and assessing the role of Paleozoic-Mesozoic hydrocarbon generation centers in the formation of «Paleozoic» oil deposits in the section of the Ostaninskoe oil and gas condensate field (Tomsk region) is solved. In the formation of the oil and gas content of the pre-Jurassic basement two reservoirs are involved: the weathering crust and the roof of the bed-rock Paleozoic. The first was formed during the period of 213–208 Ma, and the second is genetically determined by epigenetic processes in the weathering crust. Potential hydrocarbon sources for the weathering crust and bed-rock Paleozoic reservoirs are Domanic type rocks in the crystalline basement: Larinskaya S1lr, Mirnaya D1mr, Chuzikskaya D2cz, Chaginskaya D3cg Formations, as well as Tyumenskaya J1-2tm and Bazhenovskaya J3bg Formations in sedimentary cover. To perform joint paleotemperature modeling of sedimentary basins of the «modern» Jurassic-Cretaceous and Paleozoic «paleobasins», the Ostaninskaya 438P well was selected, which is due to the presence of measured temperatures both in the Jurassic sections and in the pre-Jurassic formations, as well as fluid inflows from the pre-Jurassic horizons into the well. At the first step, the solution of the inverse problem of geothermics was obtained using reservoir temperatures and vitrinite reflectance measurements from the Mesozoic deposits: density of deep heat flow from the base of sedimentary section was determined, which is characterized by a quasi-constant value from the Jurassic to the present. The second step was to solve the inverse problem using vitrinite reflectance measurements from Paleozoic sediments. As a result, the heat flow value was obtained for the key moments of geodynamic history of the stratigraphic section, starting from the Silurian. By solving direct problems of geothermics with the given values of heat flow, the structural-tectonic and thermal history of four Paleozoic potential oil source formations (as well as Jurassic – Bazhenov and Tyumen Formations) has been retraced. The controversial aspects of the heat transfer model in the section of the Ostaninskoe field are considered. It has been established that the Tyumen and Bazhenov oil sources (most likely Bazhenov) are syngenetic (in terms of generation, accumulation and preservation time) for the weathering crust and the Paleozoic reservoirs. The role of the Chaginskaya Formation as gas source is insignificant.
The article is devoted to identifying the reasons why it is so difficult to assemble a strong and longterm team in creative projects and effectively manage them. The author notes that only those companies whose HR managers are familiar with phased screening methods can do this. It is concluded that following the correct sequence of candidates passing through the selection funnel automatically solves two key problems associated with the management of creative personnel. Analytical work has been carried out to study methodologies for evaluating creative personnel in foreign and Russian companies and an own effective algorithm for passing creative applicants through the HR funnel has been proposed.
Впервые выполнено совместное моделирование катагенетических очагов генерации углеводородов осадочных бассейнов: «современного» юрско-мелового и силурийского, нижнесреднедевонского, верхнедевонско-нижнекаменноугольного «палеобассейнов». Установлено, что в условиях геолого-геофизического разреза Сельвейкинской площади источником газа резервуаров коры выветривания и кровли коренного палеозоя является, скорее всего, «девонский» -породы доманикоидного типа чагинской свиты. Ключевые слова: моделирование катагенетического очага генерации углеводородов, «современный» и палеозойские осадочные «палеобассейны», резервуар коры выветривания и коренного палеозоя, Томская область.
Актуальность исследования обусловлена важностью воспроизводства и расширения ресурсной базы углеводородов Западной Сибири на основе оценки перспектив и освоения горизонта зоны контакта и коренного палеозоя, залежи в которых относятся к трудноизвлекаемым запасам. Цель: последовательное обоснование критерия прогнозирования и поисков палеозойских залежей углеводородов, основанного на гипотезеаномальности петрофизических характеристик юрских пластов – уникальности «отражения» залежей палеозоя в геофизических параметрах перекрывающего мезозойско-кайнозойского разреза. Эта гипотеза была сформулирована и аргументирована ранее результатами изучения разрезов скважин Герасимовского месторождения с палеозойскими залежами нефти и Крапивинского месторождения с юрскими залежами нефти. Объекты: геофизические и петрофизические параметры юрских пластов-коллекторов и интервалов баженовской свиты на Останинском нефтегазоконденсатном месторождении, имеющем залежи в доюрском основании, и на Двуреченском нефтяном месторождения только с юрскими залежами нефти. Методы. Для характеристики юрских пластов-коллекторов выполнены петрофизические расчеты удельного электрического сопротивления, использовались данные индукционного каротажа и каротажа сопротивления по разрезам 28 скважин Останинского и Двуреченского месторождений. Для характеристики петрофизики аргиллитов баженовской свиты сделан качественный и количественный (статистический) анализ показаний методов потенциалов самопроизвольной поляризации, кажущегося сопротивления и гамма-каротажа. Карбонатность пород пластов-коллекторов оценивалась по данным объемного газометрического метода. Результаты. Установлено, что юрские пласты-коллекторы Останинского месторождения имеют для нефтенасыщенных пластов УЭС=11…21 ом*м, для водонасыщенных пластов УЭС=5…9 ом*м. Юрские пласты-коллекторы Двуреченского месторождения имеют для нефтенасыщенных пластов УЭС=6…12 ом*м, для водонасыщенных пластов УЭС=2…5 ом*м. Юрские пласты-коллекторы Останинского месторождения аномально, в 2 раза, более высокоомные, чем юрские пласты Двуреченского месторождения. Общая карбонатность юрских пластов Останинского месторождения составляет 5,4 %, а Двуреченского – 1,1 %. Показано, что на Останинском месторождении вариации показаний метода ПС= ±(0,5…2,5) мВ, уровень УЭС=32…42 ом*м, уровень естественной радиоактивности 36…44 мкР/ч. На Двуреченском месторождении вариации показаний ПС – ±(5,0…8,0) мВ, уровень УЭС=95…111 ом*м, уровень естественной радиоактивности 40…59 мкР/ч. Результаты исследований на Останинском и Двуреченском месторождениях полностью согласуются с ранее высказанной и аргументированной гипотезой аномальности петрофизических характеристик юрского разреза, перекрывающего залежи доюрского НГК.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2025 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.