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Sedimentology and stratigraphy are neighbors yet distinctly separate entities within the earth sciences. Put in a nutshell, sedimentology searches for the common traits of sedimentary rocks regardless of age as it reconstructs environments and processes of deposition and erosion from the sediment record. Stratigraphy, by contrast, concentrates on changes with time, on measuring time and correlating coeval events. Sequence stratigraphy straddles the boundary between the two fields. It is a sedimentologic concept as it uses depositional anatomy to reconstruct environments and lateral facies change, and it is part of stratigraphy as it studies the vertical succession of sedimentary rocks and their succession and correlation. <...>
Besides pioneer works of the 60s, the tidal sedimentologist community really emerged in the 70s (see Klein, 1998). The first international conference on tidal sedimentology took place in 1973 in Florida (USA). It was devoted to carbonate facies, less to siliciclastic deposits and mostly to intertidal areas. The conference resulted in a book gathering case studies (Ginsburg, 1975). The fining‐upward tidal flat sequence represented at this time the tidal facies model; and this was mainly applied to carbonates. The growing knowledge in siliciclastic tide‐dominated environments was synthesized a few years later by Klein (1977). Following the paper of Visser (1980) demonstrating the record of tidal cycles in estuarine dunes, clastic tidal sedimentology evolved quickly towards more comprehensive and quantitative studies, both ancient and modern. A community was born <...>
This book is designed for a one-semester course in sedimentology taken by advanced undergraduate or graduate students. It gives detailed descriptions of sedimentary features and the analytical methods used to evaluate them and is intended to support and reinforce principles presented in lectures. Discussion of principles and processes is found in complimentary texts, such as Leeder's (1982) Sedimentology: process and product and selected readings in professional journals.
Facies models are encapsulated summaries of sedimentation in a depositional environment. Since the initial formulation of this concept (Walker, 1979a), facies models have become the cornerstone of modern sedimentology, and will continue to be a vital starting point for whatever new areas of research develop in the future.
Большинство месторождений нефти, газа и газового конденсата Западно-Сибирской нефтегазоносной провинции (НГП) находятся на завершающих стадиях разработки, с неуклонным истощением традиционных запасов углеводородов (УВ) и снижением темпов роста нефтегазодобычи. Основные эксплуатационные объекты характеризуются высокой степенью вовлеченности в разработку (78%), выработанностью (33%) залежей разного фазового состава и значительным обводнением продукции скважин.
В условиях современного этапа развития топливно-энергетического комплекса России одной из главных задач нефтегазовой промышленности является задача воспроизводства сырьевой базы. Основным источником России по добыче углеводородного сырья на протяжении многих десятилетий была и остается Западно-Сибирская нефтегазоносная провинция (НГП), в пределах которой ведущими нефтедобывающими регионами являются Ямало-Ненецкий автономный округ (ЯНАО), Ханты-Мансийский автономный округ (ХМАО) и Томская область (ТО). Основная часть объёмов углеводородов (УВ) сосредоточена в юрскомеловых нефтегазоносных комплексах, обеспечивающих в последние годы добычу свыше 80% всей российской нефти и не менее 90% российского газа и газового конденсата.
Clay minerals occur in all types of sediments and sedimentary rocks and are a common constituent of hydrothermal deposits. They are the most abundant minerals in sedimentary rocks perhaps comprising as much as 40% of the minerals in these rocks. Half or more of the clay minerals in the earth's crust are illites, followed, in order of relative abundance, by montmorillonite and mixed-layer illite-montmorillonite, chlorite and mixed-layer chlorite-montmorillonite, kaolinite and septachlorite, attapulgite and sepiolite. The clay minerals are fine-grained. They are built up of tetrahedrally (Si, A l , Fe3+) and octahedrally (Al, Fe3+, Fez+, Mg) coordinated cations organized to form either sheets or chains. All are hydrous. <...>
Обогащенные органическим веществом (ОВ) древние морские отложения вызывают повышенный интерес у исследователей, поскольку являются потенциальным источником нефтяных углеводородов и, в то же время, индикатором специфических палеогеографических условий, возникавших на обширных территориях древних палеобассейнов, не имеющих современных аналогов. В проблеме реконструкции обстановок формирования этих отложений остаются нерешенные вопросы. Центральное место в ней, по-прежнему, занимает вопрос о соотношении роли биопродуктивности водоемов [Страхов, 1937, 1976; Pedersen, Calvert, 1990, 1991 идр.] и аноксидных условий в водной толще [Demaison, Moore, 1980; 1991 и др.] для накопления и сохранения ОВ в отложениях.
The study of sediments and sedimentary rocks has come a long way from the early days Of field observations followed by a cursory examination of samples in the laboratory. Now many sophisticated techniques are applied to data collected in the field and to specimens back in the laboratory. Some of these techniques have been brought in from other branches of the earth sciences, while some have been specifically developed by sedimentologists.
Historically, the relation between sedimentology and the field of ore genesis has been a function of prevailing patterns of thought. Table I offers a brief schematic summary of the trend of thought patterns since Albertus Magnus. Whenever the trend was to search for causes from within, the interest in the wall rock and its genesis was great. When causes from without appealed more to the scientists, the rocks enclosing ore deposits, and especially the sediments received little attention.