Abstract
This paper establishes the origin of hydrocarbons deposits in Jurassic and pre-Jurassic complexes in the territory of Khanty-Mansyisk field, which is associated with traps formed in the weathered Devonian carbonate sediments and in basement rocks, within the zone of compression (suture?) in the central part of the West Siberian platform. The study is relevant for substantiating oil deposits prospecting strategy considering material composition and basement tectonics of West Siberian plate.Data on core and oil from Jurassic and pre-Jurassic complexes, exposed by exploration and production wells of Khanty-Mansyisk field, which is related to Frolovsk petroleum region of the highest density of predicted resources within the Western Siberian province, is studied. Lithologic and petrophysical characteristics of rocks carried out by optical microscopy, is provided. Content and molecular weight distribution of aromatics including n-alkyl benzenes, naphthalenes and phenanthrenes are established in rock bitumoids and crude oil by chromatography-mass spectrometry.Geochemical model of hydrocarbon migration within Jurassic and pre-Jurassic oil and gas complexes is developed. The most probable hydrocarbon source in the Upper Jurassic section traditionally is organic matter containing in clay stones and siltstones of tutleymsk (bazhenov), abalaksk and, presumably, tyumen formations. A layer of coarse grained highly permeable sandstone of gorelaya formation, which comprises organic matter, probably, of major contribution to the Lower Jurassic and pre-Jurassic hydrocarbon deposits, is recorded in section of the Lower Jurassic. The unified genesis of hydrocarbons among gorelaya formation and the Paleozoic oil from Khanty-Mansyisk field is determined through molecular markers — n-alkyl benzenes С21, С23, С25. Hydrocarbon collection from dispersed organic matter of Paleozoic rocks at the great depth (not exposed by core drilling) is suggested as a probable «source» of Paleozoic oil. Oil accumulation, presumably, is concentrated in areas of tectonic block crushing of basement, oil carryover into overlying complexes is performed with thermal waters. Prediction of oil potential in traps of weathering crust and basement rocks within the compression zones of West Siberian platform is positive.
Highlights
Устанавливается происхождение залежей углеводородов в юрском и доюрском комплексах на участке Ханты-Мансийского месторождения, приуроченного к ловушкам коры выветривания по карбонатным отложениям девона и ловушкам коренного фундамента, в пределах зоны сжатия центральной части ЗападноСибирской платформы
This paper establishes the origin of hydrocarbons deposits in Jurassic and pre-Jurassic complexes in the territory of Khanty-Mansyisk field, which is associated with traps formed in the weathered Devonian carbonate sediments and in basement rocks, within the zone of compression in the central part of the West Siberian platform
Data on core and oil from Jurassic and pre-Jurassic complexes, exposed by exploration and production wells of Khanty-Mansyisk field, which is related to Frolovsk petroleum region of the highest density of predicted resources within the Western Siberian province, is studied
Summary
Ханты-Мансийского месторождения (зона локального сжатия Западно-Сибирской плиты). Устанавливается происхождение залежей углеводородов в юрском и доюрском комплексах на участке Ханты-Мансийского месторождения, приуроченного к ловушкам коры выветривания по карбонатным отложениям девона и ловушкам коренного фундамента, в пределах зоны сжатия (сутуры?) центральной части ЗападноСибирской платформы. В нижней части юрского разреза фиксируется слой крупнозернистого высокопроницаемого песчаника горелой свиты, в котором локализовано органическое вещество, предположительно вносящее основной вклад в залежи углеводородов низов юры и доюрского фундамента. 2. В нижней части юрского разреза, в пределах горелой свиты, фиксируется слой крупнозернистого высокопроницаемого песчаника мощностью до 9—11 м, в котором латерально локализовано органическое вещество, вносящее основной вклад в залежи УВ низов юры и доюрского фундамента. Единый генезис мигрирующих в пределах горелой свиты УВ и палеозойских нефтей Ханты-Мансийского месторождения устанавливается по молекулярным маркерам — н-алкилбензолам С21, С23, С25, имеющим завышенные концентрации на фоне других гомологов н-алкилбензолов. 2. По молекулярному составу н-алкилбензолов палеозойские нефти Ханты-Мансийского участка сходны с составом битумоида горелой свиты, что позволяют утвердить последнюю в качестве основного канала поступления УВ в залежи доюрского НГК.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
