Shallow Electromagnetic Soundings sTEM for WaterBearing Reservoirs Mapping under the Permafrost Zone within Yakutia Region

Tokareva, Olga; Otsimik, A.A.; Buddo, I.V.; Шелохов, И.А.; Alexandrova, A.M.; Akulova, I.V.; Sharlov, M.V.; Elimova, V.V.; Sabanchin, I.V.

doi:10.3997/2214-4609.201950153

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“…Для решения первой задачи -картирования зоны ММП -электроразведка ЗСБ эффективно применяется как в Западной [Misurkeeva et al, 2017], так и Восточной Сибири [Tokareva et al, 2019]. Причиной тому являются особенности физико-геологической модели криолитозоны: многолетнемерзлые, льдистые породы контрастно выделяются по геоэлектрическим свойствам (пониженное УЭС, повышенный коэффициент вызванной поляризации) на фоне талых пород [Kozhevnikov et al, 2014].…”

Section: геологические задачи решаемыеunclassified

“…солевой, преимущественно неантиклинальных ловушек углеводородов (УВ), резко меняющейся литологии и небольших эффективных мощностей горизонтов-коллекторов. В таких условиях необходимо комплексирование геофизических методов исследований [Vakhromeev, Davydenko, 1989]. В рамках данной парадигмы были проведены региональные исследования в пределах территории Восточной Сибири, подготовлен к дальнейшему изучению ряд объектов «аномалия типа залежь» (АТЗ), открыты крупные и уникальные месторождения нефти и газа: Верхнечонское, Среднеботуобинское, Ковыктинское, Ярактинское, Даниловское и др.…”

Section: Introductionunclassified

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Transient Electromagnetic Sounding in 2d, 3d, and 4d Modes: Sequence of Geological Exploration Activities

Buddo

Шелохов

Мисюркеева

et al. 2021

Geodin. tektonofiz.

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From 1980s, electromagnetic prospecting is an integral component of geophysical techniques for oil and gas exploration in many regions of the Russian Federation. Electromagnetic methods are used at all stages of geological exploration, including reconnaissance, discovery, prospecting and appraisal, and economic mining. In oil and gas exploration, the most commonly used technique is the near-field transient electromagnetic sounding (TEM). On the other hand, for each of these stages, specific tasks of electromagnetic prospecting have not been clearly defined yet. Furthermore, there are no standard requirements to the volume of a priori geological and geophysical information, which is sufficient for solving a geological problem. If such information is lacking or insufficient, a geological problem may be incorrectly stated and/or improperly correlated with the current stage of works.Our study aims to define which geological problems should be addressed by electromagnetic survey at the different stages of geological exploration, and to specify the requirements to the availability of a priori geological and geophysical information. We have analyzed the electromagnetic data from the regions of East and West Siberia, which have different geological settings. The main geological problems that can be solved by the seismic and electromagnetic techniques are determined. We propose a set of geophysical survey operations, which is optimal for oil and gas exploration. An effective sequence of electromagnetic prospecting stages is determined, and preliminary and accompanying surveys are specified. The requirements to the availability of a priori information are proposed, and its volume is defined. Geological problems are defined with respect to the corresponding stages of geological exploration. Special attention is given to approaches to the mineral resource estimation and calculation of hydrocarbon reserves, taking into account electromagnetic survey results. It is proposed to use the electromagnetic data at the stage of prospecting and appraisal, which aims to assess the resources of categories D l and D 0 , as well as at the exploration stage for estimating the reserves of category C 2 in new and explored fields. Approaches to the economic assessment of using electromagnetic surveys as part of the geological exploration are discussed. Our study shows that a correct sequence of electromagnetic prospecting operations at each stage can ensure obtaining an original geological dataset of the given stage and thus providing a proper basis for the next stage of oil-gas field investigation.

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Section: геологические задачи решаемыеunclassified

Section: Introductionunclassified