Facies, cyclicity and reservoir properties of the Lower Muschelkalk (Middle Triassic) in the NE Netherlands

Facies ◽  
2002 ◽  
Vol 46 (1) ◽  
pp. 119-132 ◽  
Author(s):  
Michael Pöppelreiter
2005 ◽  
Vol 84 (4) ◽  
pp. 409-413 ◽  
Author(s):  
G.F.W. Herngreen ◽  
J.H.A. van Konijnenburg - van Cittert ◽  
H.W. Oosterink

AbstractThe present publication deals with recent palynological results of a relatively small interval of Muschelkalk and exposures of the overlying clay deposits in the Winterswijk quarries. For the first time the Lower Muschelkalk Member in the Netherlands could be independently dated as Bithynian (Anisian, Middle Triassic). Contrary to widely accepted opinions the overlying almost black clay deposit is not Liassic but Rhaetian in age and it is assigned to the Sleen Shale Formation. This marginal marine clay which pinches out to the south, is in turn overlain by a light gray, full-marine Lower-Oligocene clay of the Rupel Formation. An anomalous occurrence of Liassic clay is now attributed to subrosion of Röt salt followed by collapse of the overlying Muschelkalk, Rhaetian and Lias strata.


2013 ◽  
Vol 92 (1) ◽  
pp. 61-67 ◽  
Author(s):  
H.W. Oosterink ◽  
H. Winkelhorst

AbstractDuring recent years, regular round structures have been collected from the top of Bed 12 of the Vossenveld Formation (Lower Muschelkalk, lower Middle Triassic, Anisian) in the Winterswijk area, eastern Netherlands. These are here illustrated and described as probable remains of jellyfish.


2002 ◽  
Vol 76 (5) ◽  
pp. 882-891 ◽  
Author(s):  
Dirk Knaust

The ichnogenusPholeusFiege, 1944, is a common constituent of the Lower Muschelkalk (Middle Triassic) carbonates of the Germanic Basin, where it occurs in the upper part of shallowing upward cycles. It is restricted to a marly limestone lithofacies and is commonly associated with omission and erosion surfaces. The dwelling structures (domichnia) were created in a shallow-marine to lagoonal paleoenvironment in an intertidal to shallow subtidal setting. New material from Thuringia and Lower Saxony makes a reevaluation ofPholeuspossible and confirms the validity of this ichnogenus. Certain features, such as general form, wall, lining, and branching differentiate it from similar trace fossils. In addition to the already describedP. abomasoformis,three new ichnospecies are named for distinctive forms:P. bifurcatus, P. platiformis,andP. elongatus.Based on geometry, size, and wall lining, the burrow producers were most probably decapod crustaceans. Many similarities to modern burrows ofCallianassasp.,Neocallichirus grandimina,andNephrops norvegicussuggest thalassinian shrimps and lobsters as likely tracemakers ofPholeusburrows. Compound burrow systems and retrusive burrow parts with spreiten-like structures are common and point to an upward shifting of the burrows related to certain sediment input in relation to tidal currents.


Author(s):  
М.А. Хасанов ◽  
Т.Б. Эзирбаев ◽  
А.С. Эльжаев

Изучаемой проблемы заключается в том, что месторождения нефти и газа Восточного Предкавказья являются одними из самых длительно разрабатываемых в России. Однако в настоящее время, когда объем геологоразведочных работ на нефть и газ значительно снизился, прирост запасов УВ сократился до минимума. Но по оценкам различных геологических служб РФ, в глубокопогруженных пермо-триасовых отложениях Восточного Ставрополья и Равнинного Дагестана еще может содержаться значительный объем углеводородного сырья. И для определения правильного комплекса геологоразведовательных работ на нефть и газ необходим комплексный анализ всех геологических и промыслово-геофизических материалов, результатов лабораторного анализа петрофизических свойств, обобщение и ревизия результатов опробования и испытания карбонатных отложений изучаемых отложений с целью выявления закономерностей развития коллекторов. В связи с этим выполнение данной работы в настоящее время является актуальной задачей.Цель работы – обобщить многочисленные исследования по изучению литолого-петрографических особенностей отложений Пермо-триасового комплекса Восточного Предкавказья и его битуминологической характеристике, которые говорят о том, что в разрезе его имеются мощные толщи пород, обладающие богатым потенциалом генерации жидких и газообразных углеводородов. В первую очередь, к ним следует отнести карбонатные и карбонатно-терригенные породы нижнего-среднего триаса морского генезиса (Нефтекумская, Култайская, Демьяновская и Кизлярская свиты). Существенный объем углеводородов могли генерировать и карбонатно-терригенные и терригенные пестроцветные породы среднего триаса лагунно-морского и лагунно-континентального генезиса (Плавненская и Закумская свиты), а также терригенная пестроцветная толща пород верхней Перми преимущественно морского генезиса (Куманская свита). Методы исследования. В статье рассмотрены проблемы расчленения разреза на пласты и выделения коллекторов, оценки их фильтрационно-емкостных свойств пород-коллекторов, обоснования нефтегазонасыщенности и проницаемости продуктивных пластов. Для установления закономерностей распространения коллекторов и составления рекомендаций на проведение геологоразведочных работ, направленных на поиск нефти и газа в изучаемом нефтегазоносном комплексе был выполнен анализ литофациальных, петрофизических и емкостно-фильтрационных свойств пород-коллекторов в разрезе нижнетриасовых отложений нефтекумской свиты Восточного Ставрополья. В работе так же приведены результаты геофизических и лабораторных исследований, которые содержат данные о петрофизических и физико-химических свойствах изучаемых пород отложений нижнего триаса: пористость; объемный вес; карбонатность; коэффициент гидрофобности, удельное электрическое сопротивление; интервальное время распространения упругих продольных волн. Результаты исследования. Из комплексного анализа распределения головных петрофизических параметров и результатов испытания скважин видно, что лишь на юго-востоке получены притоки нефти из карбонатных коллекторов нефтекумской свиты. В области хемогенного (доломитового) карбонатонакопления продуктивными являются XI-XII пласты средней подсвиты, в области массового развития биогермных построек и межрифовых понижений продуктивными являются I-VI пласты нефтекумской свиты. В областях мелководного карбонатонакопления находятся водонасыщенные коллектора The urgency of the studied problem lies in the fact that the oil and gas fields of the Eastern Ciscaucasia are one of the longest developed in Russia. However, at present, when the volume of exploration for oil and gas has significantly decreased, the increase in hydrocarbon reserves has decreased to a minimum. But according to estimates of various geological services of the Russian Federation, in the deeply submerged Permo-Triassic sediments of the East Stavropol and Plain Dagestan, a significant amount of hydrocarbon raw materials may still be contained. And to determine the correct complex of geological exploration for oil and gas, a comprehensive analysis of all geological and field geophysical materials, results of laboratory analysis of petrophysical properties, generalization and revision of the results of testing and testing of carbonate deposits of the studied deposits in order to identify patterns of reservoir development are necessary. In this regard, the implementation of this work is currently an urgent task.The purpose of the work is to summarize numerous studies on the lithological and petrographic features of the Permian-Triassic deposits of the Eastern Ciscaucasia and its bituminological characteristics, which indicate that it contains powerful rock strata with a rich potential for generating liquid and gaseous hydrocarbons. First of all, these include carbonate and carbonate-terrigenous rocks of the Lower-Middle Triassic of marine origin (Neftekumskaya, Kultayskaya, Demyanovskaya and Kizlyarskaya suites). A significant amount of hydrocarbons could be generated by both carbonate-terrigenous and terrigenous variegated rocks of the Middle Triassic of the lagoon-marine and lagoon-continental genesis (Plavnenskaya and Zakumskaya Formations), as well as terrigenous variegated strata of rocks of the upper Perm mainly of the marine genesis (Kuman Formation).Research Methods.The article discusses the problems of dividing a section into formations and separating reservoirs, assessing their filtration and reservoir properties of reservoir rocks, substantiating oil and gas saturation and permeability of productive formations. In order to establish the patterns of reservoir distribution and make recommendations for geological exploration aimed at finding oil and gas in the studied oil and gas complex, the lithofacial, petrophysical, and capacitive-filtration properties of reservoir rocks were analyzed in the context of the Lower Triassic sediments of the Neftekum Formation. The paper also presents the results of geophysical and laboratory studies, which contain data on the petrophysical and physico-chemical properties of the studied rocks of the Lower Triassic sediments: porosity; volume weight; carbonate content; hydrophobicity coefficient, electrical resistivity; interval propagation time of elastic longitudinal waves.The results. From a comprehensive analysis of the distribution of the leading petrophysical parameters and the results of well testing, it is clear that oil flows from the carbonate reservoirs of the Neftekum Formation were obtained only in the southeast. In the area of chemogenic (dolomitic) carbonate accumulation, the XI-XII layers of medium subformation are productive, in the field of mass development of bioherm constructions and inter-riff depressions, I-VI layers of the Neftekum suite are productive. In areas of shallow carbonate accumulation are water-saturated reservoirs


2021 ◽  
Vol 3 (3) ◽  
pp. 87-100
Author(s):  
J. M. Tlepieva ◽  
N. S. Shilanov

This paper discusses the boundary values of the reservoir properties of carbonate rocks of the Triassic sediments of South Mangyshlak, which are important for the interpretation of production geophysical data and for perforating and blasting operations. In terms of lithological composition, Triassic deposits are represented by two types of commercial reservoirs terrigenous and carbonate. Carbonate reservoirs are localized in the volcanic-dolomite and volcanic-limestone strata of the Middle Triassic. These rocks are characterized by a complex type of reservoir: porous-fractured, porous-cavernous and fractured. Sediments of the Upper Triassic occur with erosion on the Middle Triassic sedimentary complex and are represented by alternating tuffaceous, silt-sandy and mudstone rocks. Polymictic sandstones are oil-saturated to varying degrees; oil deposits are confined to them. To substantiate the quantitative criteria of the reservoir, the results obtained during special laboratory studies of the core were used. Filtration studies were carried out, where physical and hydrodynamic characteristics were determined when oil was displaced by displacing reagents. The obtained parameters were used to construct correlations collector non-collector. Using the relationships between the reservoir properties of the reservoir, the dependence of the porosity and permeability on the residual water content, as well as open porosity and permeability on the dynamic porosity, the boundary values were determined.


AAPG Bulletin ◽  
2006 ◽  
Vol 90 (1) ◽  
pp. 61-89 ◽  
Author(s):  
Ravi Borkhataria ◽  
Thomas Aigner ◽  
Koos J.C.P. Pipping

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