scholarly journals PETROGRAPHIC CHARACTERISTICS OF THE RESERVOIR ROCKS IN THE BAT-UPPER JURASSIC DEPOSITS OF THE SOUTH OF WESTERN-SIBERIAN PETROLEUM BASIN

2019 ◽  
Vol 2 (1) ◽  
pp. 25-31
Author(s):  
Lyudmila Vakulenko ◽  
Aleksey Popov ◽  
Sergey Rodyakin ◽  
Evgeniy Khabarov ◽  
Peter Yan
Keyword(s):  
Oil And Gas ◽  
Upper Jurassic ◽  
The South ◽  
Reservoir Properties ◽  
Petrographic Composition ◽  
Reservoir Rocks ◽  
Regional Sources ◽  
Porosity And Permeability ◽  
Maximum Parameters ◽  
Petroleum Basin

The features of the petrographic composition of the bath-upper Jurassic silt-sand rocks exposed by wells in the South of the West Siberian oil and gas basin are considered. The study is focused on the parameters that had a significant influence on the reservoir properties of rocks: granulometric and mineral-petrographic composition of the clastic part of rocks, cement content, structure and composition. Some conclusions are drawn on the spatial distribution of rocks of different composition within the subisochronous sedimentary complexes. It is assumed that significant variations in their composition are caused by a complex combination of varying degrees of interdependent factors: influence of local and regional sources of clastic material, peculiarities of redistribution of material during its transportation and sedimentation, and post-sedimentation changes. Most variable values of reservoir properties, with a recorded maximum parameters of porosity and permeability are obtained for the rocks of Medium-Upper Oxford complex on Verkhnetarskaya, Dedovskaya, Basinskaya, Veselovskaya, to a lesser extent, Kasmanskaya, Vostochnaya and Tai-Dasskaya drilling sites.

scholarly journals Modeling the processes of deformation and destruction of the rock sample during its extraction from great depths

2021 ◽  
Vol 248 ◽  
pp. 243-252
Author(s):  
Alexey Grishchenko ◽  
Artem Semenov ◽  
Boris Melnikov
Keyword(s):  
Mechanical Properties ◽  
Oil And Gas ◽  
Rock Sample ◽  
Geological Exploration ◽  
Reservoir Properties ◽  
Critical Dimensions ◽  
Reservoir Rocks ◽  
Rock Samples ◽  
Porosity And Permeability

Article investigates the change in the geophysical properties of rocks in the process of extracting the rock sample from great depths. Evaluation of changes in effective elastic properties, porosity and permeability of rock samples during extraction was carried out by means of finite element modeling. Assessment of the critical dimensions and orientation of internal defects, leading to the destruction of the rock samples during extraction from great depths, has been made based on the methods of linear destruction mechanics. Approach that makes it possible to calculate the change in the mechanical properties, porosity and fracturing of reservoir rocks in the process of extracting the rock sample from depths to the surface is proposed. Use of refined data on the mechanical properties of recoverable rock samples makes it possible to increase the accuracy of digital geological models required for geological exploration, determination of reservoir properties and oil and gas saturation of a field, and development of oil and gas deposits. Application of such models is especially relevant at all stages of the fields development with hard-to-recover reserves.

GEOLOGY OF BARROW ISLAND OIL FIELD

1973 ◽  
Vol 13 (1) ◽  
pp. 49 ◽  
Author(s):  
Keith Crank
Keyword(s):  
Oil And Gas ◽  
Water Injection ◽  
Water Source ◽  
Upper Jurassic ◽  
Oil Field ◽  
Late Triassic ◽  
Low Permeability ◽  
High Porosity ◽  
The South ◽  
The North

The Barrow Island oil field, which was discovered by the drilling of Barrow 1 in 1964, was declared commercial in 1966. Since then 520 wells have been drilled in the development of this field which has resulted in 309 Windalia Sand oil producers (from about 2200 feet), eight Muderong Greensand oil wells (2800 feet), five Neocomian/Upper Jurassic gas and oil producers (6200 to 6700 feet), eight Barrow Group water source wells and 157 water injection wells.Production averages 41,200 barrels of oil per day, and 98% of this comes from the shallow Windalia Sand Member of Cretaceous (Aptian to Albian) age. These reserves are contained in a broad north-plunging nose truncated to the south by a major down-to-the-south fault. The anticline is thought to have been formed initially from a basement uplift during Late Triassic to Early Jurassic time. Subsequent periods of deposition, uplift and erosion have continued into the Tertiary and modified the structure to its present form. The known sedimentary section on Barrow Island ranges from Late Jurassic to Miocene.The Neocomian/Jurassic accumulations are small and irregular and are not thought to be commercial in themselves. The Muderong Greensand pool is also a limited, low permeability reservoir. Migration of hydrocarbons is thought to have occurred mainly in the Tertiary as major arching did not take place until very late in the Cretaceous or early in the Palaeocene.The Windalia Sand reservoir is a high porosity, low permeability sand which is found only on Barrow Island. One of the most unusual features of this reservoir is the presence of a perched gas cap. Apparently the entire sand was originally saturated with oil, and gas subsequently moved upstructure from the north, displacing it. This movement was probably obstructed by randomly-located permeability barriers.

scholarly journals RESULTS OF PETROPHYSICAL STUDIES OF THE PRODUCTIVE STRATUM DEPOSITS OF THE BAKU ARCHIPELAGO NORTHERN OIL AND GAS BEARING AREAS

2020 ◽  
pp. 22-27
Author(s):  
V. Sultanov ◽  
L. Sultanov
Keyword(s):  
Granulometric Composition ◽  
Oil And Gas ◽  
Physical Parameters ◽  
Reservoir Properties ◽  
Secondary Porosity ◽  
North West ◽  
Productive Stratum ◽  
Porosity And Permeability ◽  
The Individual ◽  
Lithological Composition

The complex results of petrophysical testing of rocks, taken from prospecting-development wells of Duvanni-deniz, Sangachal-deniz, Bulla-deniz, Garasu and etc. areas, where the sediments of productive stratum are widely expanded, have been given. Average values of granulometric composition of rocks of productive unit of the above areas by the section have been recounted. The problem of dependence of permeability on porosity and depth was solved. Dependence between physical parameters for the individual kinds of rocks, dependence between physical properties and material structures are established. The results of various petrophysical research methods show that the filtration capacitance properties, in general, deteriorate with depth. However, in certain cases, in clay and carbonate rocks, reservoir properties can improve, due to the appearance of secondary porosity under relatively stringent thermobaric conditions. The histograms, which consist of average values of granulometric composition of productive stratum rocks when crossing some places of archipelago are constructed, the problems of dependence of permeability on porosity and depth were solved. The researches showed, that the physical process of the same- named and same-aged features rocks change in the result of geological-physical processes, getting different values. It's noticed, that the porosity and permeability are increasing from north-west to south-east by changing lithological composition.

scholarly journals Sedimentology, geochemistry and reservoir properties of Upper Jurassic deep marine sediments (Hareelv Formation) in the Blokelv-1 borehole, Jameson Land Basin, East Greenland

2018 ◽  
pp. 39-64
Author(s):  
Morten Bjerager ◽  
Claus Kjøller ◽  
Mette Olivarius ◽  
Dan Olsen ◽  
Niels H. Schovsbo
Keyword(s):  
Oxygen Depletion ◽  
Upper Jurassic ◽  
High Density ◽  
Core Analysis ◽  
Reservoir Properties ◽  
East Greenland ◽  
Sea Floor ◽  
The Core ◽  
Trace Metal Content ◽  
Porosity And Permeability

The fully cored Blokelv-1 borehole was drilled through Upper Jurassic strata in the central part of the Jameson Land Basin, central East Greenland. The borehole reached a total depth of 233.8 m with nearly 100% recovery of high-quality core. An extensive analytical programme was undertaken on the core; sedimentological interpretation and reservoir characterisation were based on facies analysis combined with conventional core analysis, bulk geochemistry and spectral gamma and density scanning of the core. The Upper Jurassic Hareelv Formation was deposited in relatively deep water in a slope-to-basin setting where background sedimentation was dominated by suspension settling of organic-rich mud in oxygen-depleted conditions. Low- and high-density gravity-flow sandstone interbeds occur throughout the cored succession. About two-thirds of the high-density turbidite sandstones were remobilised and injected into the surrounding mud-rock. The resulting succession comprises nearly equal amounts of mudstones and sandstones in geometrically complex bodies. Ankerite cementation occurs in 37% of the analysed sandstones in varying amounts from minor to pervasive. Such ankerite-cemented sandstones can be identified by their bulk geochemistry where Ca > 2 wt%, Mg > 1 wt% and C > 1 wt%. The analysed mudstones are rich in Al, Fe, Ti and P and poor in Ca, Mg, Na and Mn. The trace-metal content shows a general increase in the upper part of the core reflecting progressive oxygen depletion at the sea floor. The reservoir properties of the Blokelv-1 sandstones were evaluated by both conventional core analysis and using log-derived porosity and permeability curves. The high-density turbidite beds and injectite bodies are a few centimetres to several metres thick and show large variations in porosity and permeability, in the range of 6–26 % for porosity and 0.05–400 mD for permeability. Individual sandstone units that are 1–7 m thick yield a net vertical reservoir thickness of 40 m with porosities of 15–26% and permeabilities of 1–200 mD. Heterolithic sandstone–mudstone units are generally characterised by poor reservoir quality with porosities of 2–14% and permeabilities of 0.1–0.6 mD.

scholarly journals FEATURES OF THE STRUCTURE AND OIL AND GAS POTENTIAL OF LOWER CRETACEOUS AND UPPER JURASSIC SEDIMENTS IN WESTERN AREAS OF WESTERN SIBERIA

2017 ◽  
pp. 25-34
Author(s):  
G. .. Mukher ◽  
S. F. Kulagina ◽  
A. V. Goryachev ◽  
E. A. Pakhomova ◽  
A. A. Gladyshev
Keyword(s):  
Western Siberia ◽  
Oil And Gas ◽  
Integrated Approach ◽  
Upper Jurassic ◽  
Geological Structure ◽  
Silty Sand ◽  
Reservoir Rocks ◽  
Bazhenov Horizon ◽  
Gas Potential ◽  
Hydrocarbon Deposits

The features of the geological structure and oil and gas potential of the Bazhenov-Abalak oil and gas complex are discussed. Based on new geological and seismic data, using an integrated approach, the zones of distribution and the boundaries of thinning out of silty sand reservoir rocks of Vogulkinskaya strata were mapped, four traps and two zones (Ourinskaya, Eastern Tolumskaya), which are perspective for hydrocarbon deposits search, were distinguished. In Bazhenov horizon, the zones of development of anomalous sections and bituminous sediments were mapped, laying above Bazhenov formation, which are perspective for hydrocarbon deposits search. Recommendations for further exploration are given.

TANAMI-1 OIL DISCOVERY: BARROW SUB-BASIN

1992 ◽  
Vol 32 (1) ◽  
pp. 86
Author(s):  
V. Beales ◽  
E.A. Howell
Keyword(s):  
Lower Cretaceous ◽  
Analysis Data ◽  
Core Analysis ◽  
Residual Oil ◽  
The South ◽  
Reservoir Properties ◽  
Offshore Area ◽  
Early Tertiary ◽  
Porosity And Permeability ◽  
Made In

The Tanami oil discovery was made in 1991. The discovery well was drilled from an onshore location on Varanus Island and deviated into the offshore area. A small, 6.8 m oil column was intersected at the top of the Lower Cretaceous Flag Sandstone Member of the Barrow Group. Beneath the moveable oil, a residual zone of 19.8 m was encountered.Petrophysical, petrological and core analysis data indicate different reservoir properties in the moveable oil, residual oil and water zones. These results show that the oil in place has retarded diagenesis and associated reduction in porosity and permeability values.The residual oil column is interpreted to be a result of northward structural tilting in the early Tertiary, causing oil previously trapped to be spilled to the south.

scholarly journals Diagenetic impact on reservoir sandstones of the Heno Formation in the Ravn-3 well, Danish Central Graben

2018 ◽  
pp. 9-12
Author(s):  
Simone Pedersen ◽  
Rikke Weibel ◽  
Peter N. Johannessen ◽  
Niels H. Schovsbo
Keyword(s):  
North Sea ◽  
Middle Jurassic ◽  
Oil And Gas ◽  
Mineralogical Composition ◽  
Upper Jurassic ◽  
Gas Production ◽  
Oil And Gas Production ◽  
Carbonate Cement ◽  
Porosity And Permeability ◽  
Reservoir Sandstones

Oil and gas production from siliciclastic reservoirs has hitherto been in the Danish Central Graben mostly from Palaeogene and Middle Jurassic sandstone. The Ravn field was the first Upper Jurassic field to start operation. The reservoir is composed of sandstone of the Heno Formation. Production takes place at a depth of 4000 m, which makes Ravn the deepest producing field in the Danish North Sea. The Heno Formation mainly consists of marine shoreface deposits, where foreshore, middle and lower shoreface sandstones constitute the primary reservoir. The results of this study of the diagenetic impact on the mineralogical composition, porosity and permeability are presented here. Microcrystalline quartz has preserved porosity in the sandstone, whereas illite, quartz overgrowth and carbonate cement have reduced both porosity and permeability.

scholarly journals NEW DATA ON PROMISING OIL AND GAS OBJECTS IN THE SANDSTONES OF THE YAMNA SUITE OF THE PALEOCENE IN THE NORTHWEST OF THE SKIBA ZONE OF THE UKRAINIAN CARPATHIANS

2021 ◽  
pp. 90-110
Author(s):  
V.Ye. Shlapinskiy ◽  
H.Ya. Havryshkiv ◽  
Yu.P. Haievska
Keyword(s):  
Oil And Gas ◽  
Gas Production ◽  
Oil Field ◽  
Distribution Area ◽  
Total Production ◽  
Reservoir Properties ◽  
Oil And Gas Production ◽  
The North ◽  
Natural Oil ◽  
Porosity And Permeability

More than 6 million tons of the oil have been extracted in the Skybа Zone of the Ukrainian Carpathians. In particular, 4.2 million tons of oil (85.7% of total production) were obtained from the Yamna sandstones of Paleocene, which are characterized by satisfactory physical properties. Most of the areas of fields that exploited them are located in the Boryslav oil and gas production area. Among them are such oil fields as Skhidnytsko-Urytske (more than 3.8 million tons of oil extracted), Violeta, Faustina, MEP, Miriam and Ropne. Outside this area, oil was extracted in Strilbychi and Staraya Sol. At most of these fields, oil horizons are at a depth of only 100-800 m. The gas and condensate are extracted at the field of Tanyavа in the wing of the Vytvytska Luska of the Berehova Skyba, which has been torn off by the thrust. In addition, a very large number of natural oil and gas manifestations - direct signs of oil and gas potential - have been recorded in the Skyba Zone. All this indicates the potential prospects of structures within the Skyba Zone, including shallow ones. The distribution area of Yamna sandstones is much larger than the area of these deposits. The distribution area of sandstones of Yamna is much larger than the area of these deposits. It occupies about half of the area of Skyba Zone. Part of it can be considered promising, removing areas where of Yamna sandstones are present on the day surface, although, even in such conditions, they are in some cases industrially oil-bearing (Strelbychi oil field). Sandstones of Yamna are characterized by satisfactory reservoir properties., The calculated porosity and permeability reach the maximum values at known deposits: 0.182 and 130 ∙ 10–3 microns2 respectively, and the estimated thickness of 13.5 m. In the Folded Carpathians and, especially, within the north-eastern fragments (Beregova, Oriv, Skoliv) in different years performed a large amount of field seismic surveys. On the basis of the obtained materials, for the first time in the Carpathian region structural constructions were made on the reflecting horizons in the Paleocene (Yamna Formation) and in the Stryi Formation of the Upper Cretaceous. This article evaluates the prospects of these research objects. The Khodkiv and Osichnyanska structures of Berehova Skyba are recommended for conducting search works.

scholarly journals Spatial distribution of Permian-Triassic deposits of the Eastern Ciscaucasia and their oil and gas potential

2020 ◽  
Author(s):  
М.А. Хасанов ◽  
Т.Б. Эзирбаев ◽  
А.С. Эльжаев
Keyword(s):  
Oil And Gas ◽  
Middle Triassic ◽  
Lower Triassic ◽  
Comprehensive Analysis ◽  
Carbonate Content ◽  
Propagation Time ◽  
Well Testing ◽  
Geological Exploration ◽  
Reservoir Properties ◽  
Reservoir Rocks

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

scholarly journals THE INFLUENCE OF SEDIMENTATION AND POST-SEDIMENTATION TRANSFORMATIONS ON THE RESERVOIR PROPERTIES OF THE ROCKS

2019 ◽  
pp. 14-19
Author(s):  
V. Khomyn ◽  
M. Maniuk ◽  
O. Maniuk ◽  
A. Popluiko ◽  
N. Khovanets
Keyword(s):  
Oil And Gas ◽  
Scientific Evidence ◽  
Gas Content ◽  
High Porosity ◽  
Reservoir Properties ◽  
Quartz Content ◽  
Positive Correlation ◽  
Median Diameter ◽  
Porosity And Permeability ◽  
Cover Thickness

The topicality of the research is proved by the scientific evidence of the peculiarities of the sedimentation and post-sedimentation transformations of the rocks in relation to their possible oil and gas content. The productive sediments of the deposits of the interior of the Precarpathian Depression were thoroughly and lithologically researched. The objective implied the study and recognition of the reservoir properties within primary (sedimentation) and secondary (post-sedimentation) factors. The primary ones are as follows: granulity (grains median diameter), sorting, and rock maturity. Consequently, a positive correlation between the grains median diameter and rock porosity has been determined; the very coefficient equals 0.56. Evidently, unlike the well-sorted sandstones, the badly graded ones are marked by poor porosity and permeability. The positive correlation between porosity and clastic quartz content is revealed: should the latter increase, the former will go up as well. Apparently, more mature sandstones are characterized by dramatically high porosity; this factor positively affects the reservoir properties of the rocks. After studying the secondary transformations of the sandy rocks, we have determined that the diagenesis stage is defined by the change of mineral composition. This alteration is mainly caused by organic material decomposition and the appearance of reducing environment. Considering the cover thickness, we have graded the transformations of the fragments of the sandy-aleuritic rocks of the depression. The pattern of the catagenetic changes at various depths has been introduced. In the end, we have inferred that the increasing depth starts influencing the three types of the structures, i.e. incorporating, reclaiming and microstilolite rather gradually. In addition, the declining importance of the conformal structures has been identified. The stress pattern of the catagenetically transformed solid rocks promotes the microfracture within the late catagenesis zones; this factor predetermines the development of decompression zones at the depths exceeding 4 km characterised by good reservoir properties.

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