Silurian carbonate reservoir rocks of the joint zone of the Khoreyver depression and the Chernyshev ridge

2021 ◽  
Vol 3 ◽  
pp. 41-48
Author(s):  
I.I. Danshchikova ◽  
◽  
T.V. Maidl ◽  
A.V. Zhuravlev ◽  
V.S. Nikiforova ◽  
...  
Keyword(s):  
Carbonate Reservoir ◽  
Void Space ◽  
Reservoir Rocks ◽  
Lower Silurian ◽  
Coastal Marine ◽  
First Case ◽  
Capacitive Properties ◽  
Chernyshev Ridge ◽  
Filtration Properties ◽  
Hydrocarbon Deposits

The paper presents a comprehensive study of low-capacity Silurian carbonate reservoir rocks in the northeastern regions of the Timan-Pechora province. Silurian deposits in the sections of the Khosedayu swell, the Talbey block, and the Makarikha-Salyukin anticlinal zone are mainly secondary dolomites and, to a lesser extent, limestones, as well as with low-power interlayers of agrillites, clay dolomites, dolomite-anhydrite rocks. The deposits were formed in coastal-marine and shallow-marine conditions. As a result of the conducted studies, it was noted that dolomites with a shadow biohermal structure have the best filtration properties in the Lower Silurian, and bioclastic limestones – in the Upper Silurian. The reservoir rocks of the Talbey block of the Chernyshev ridge have the best filtration-capacitive properties. The main volume of the void space in the first case is associated with cavities and cracks, in the second one – with matrix porosity. However, the signs of modern karst in the salts of Malo-Tavrotinsky strata observed from the core indicate a possible reformation of the deposits, which requires more careful attention when predicting deposits. The results obtained can contribute to the design of a rational system for the development of hydrocarbon deposits.

scholarly journals Reservoirs in carbonates of the lower oil and gas-bearing complex of the Timan-Pechora Province (for the anniversary of T. V. Maydl)

2021 ◽  
pp. 40-43
Author(s):  
N. N. Timonina ◽  
I. I. Danshchikova
Keyword(s):  
Significant Contribution ◽  
Oil And Gas ◽  
Practical Importance ◽  
Carbonate Reservoirs ◽  
Void Space ◽  
Lower Silurian ◽  
Filtration Properties ◽  
Gas Bearing ◽  
Sedimentation Conditions ◽  
Carbonate Deposits

The paper presents Tatyana V. Maydl’s researches of formation and patterns of distribution of natural reservoirs in carbonate deposits of the Timan-Pechora oil and gas province. Tatyana Viktorovna Maydl is a recognized specialist in oil and gas geology. Her significant contribution to the development of the theoretical base of formation of carbonate deposits in the region, reconstruction of sedimentation conditions, finding degree of influence of secondary transformations on the reservoir and filtration properties of carbonate rocks, development of the basis for geological models of carbonate reservoirs, are analyzed. In the field of studying the morphology of the void space in low-capacity carbonate reservoirs, T. V. Maydl found that in the Lower Silurian dolomites with a shadow biohermal structure had the best filtration features, and in the Upper Silurian — bioclastic limestones. The main volume of the void space in the first type is associated with caverns and cracks, in the second — with matrix porosity. We showed that the results of T. V. Maydl’s work were not only of theoretical, but also of practical importance.

scholarly journals The structure of void space of complex structured Bashkir carbonate reservoir rocks from the Opishnianske deposit of the DDD

2019 ◽  
Vol 41 (3) ◽  
pp. 189-202
Author(s):  
S. Vyzhva ◽  
I. Bezrodna ◽  
O. Tkachenko
Keyword(s):  
Carbonate Reservoir ◽  
Void Space ◽  
Reservoir Rocks

scholarly journals Prediction of filtration and capacitive properties and oil saturation characteristics of complex structure carbonate reservoirs (on the example of the Northwestern part of DDB)

2020 ◽  
pp. 78-87
Author(s):  
O. V. Oliinyk ◽  
S. A. Vyzhva ◽  
V. V. Antoniuk ◽  
I. M. Bezrodna
Keyword(s):  
Gamma Ray ◽  
Complex Structure ◽  
Well Logging ◽  
Carbonate Reservoir ◽  
Donets Basin ◽  
Northwestern Part ◽  
Oil Saturation ◽  
Reservoir Rocks ◽  
Capacitive Properties ◽  
Carbonate Deposits

The world achievements of the study of carbonate reservoir rocks with secondary voids have been analyzed. An integrated approach to the study of this type of reservoir has been demonstrated on the example of reservoir rocks of the Visean strata of the South-Berestivske field in the North-Western part of the Dnipro-Donets Basin. The purpose of this article is to predict the reservoir filtration-capacitive properties, as well as oil saturation characte-ristics of complex carbonate reservoir rocks using well logging data. To solve this problem, an integrat-ed approach is used. It includes the methods of porosities balance and functional transformations (normalization) of the electrical and radioactive well logging curves (lateral logging - neutron gamma ray logging, impulse neu-tron-neutron logging - neutron gamma ray logging). As a result, the authors have identified intervals in the Visean carbonate deposits with cavernous voids and cracks. Each individual geophysical method is influenced by the structure of the void space. Due to this, when calculating the porosity coefficient for different probes, the au-thors identify intervals represented by carbonate deposits, mainly of the porous-cavernous type. However, there is an interval of 4287.6-4289.6 m of porous-cavernous-fractured type. It is established that in the selected layers the coefficients of different types of porosity are: secondary - 2.5-6%, cavernous - 1.7-5% and fracture -0.2%. The thickness of pro-ductive sediments varies within 0.8 - 2.4 m (the average value is 2 m). The authors also substantiated the choice of parameters when calculating the saturation coefficient in complex structural reservoirs. Moreover, it is noted that the reservoir properties are provided by the presence of secondary voids, namely the cavities through which the fluid is filtered, and the rock matrix is compacted, poor-porous and low-permeable.

Evaluation of filtration-capacitive properties of complex reservoir rocks using the results of core microtomography

2019 ◽  
pp. 86-88
Author(s):  
S.R. Bembel ◽  
◽  
V.M. Aleksandrov ◽  
A.A. Ponomarev ◽  
P.V. Markov ◽  
...  
Keyword(s):  
Reservoir Rocks ◽  
Capacitive Properties

Late Permian carbonate concretions in the marine siliciclastic sediments of the Ravnefjeld Formation, East Greenland

2002 ◽  
pp. 126-132
Author(s):  
Jesper Kresten Nielsen ◽  
Nils-Martin Hanken
Keyword(s):  
Mineral Resources ◽  
Sedimentary Basins ◽  
Sedimentary Facies ◽  
Carbonate Reservoir ◽  
Upper Permian ◽  
Late Permian ◽  
East Greenland ◽  
Reservoir Rocks ◽  
Carbonate Concretions ◽  
Siliciclastic Sediments

NOTE: This article was published in a former series of GEUS Bulletin. Please use the original series name when citing this article, for example: Kresten Nielsen, J., & Hanken, N.-M. (2002). Late Permian carbonate concretions in the marine siliciclastic sediments of the Ravnefjeld Formation, East Greenland. Geology of Greenland Survey Bulletin, 191, 126-132. https://doi.org/10.34194/ggub.v191.5140 _______________ This investigation of carbonate concretions from the Late Permian Ravnefjeld Formation in East Greenland forms part of the multi-disciplinary research project Resources of the sedimentary basins of North and East Greenland (TUPOLAR; Stemmerik et al. 1996, 1999). The TUPOLAR project focuses on investigations and evaluation of potential hydrocarbon and mineral resources of the Upper Permian – Mesozoic sedimentary basins. In this context, the Upper Permian Ravnefjeld Formation occupies a pivotal position because it contains local mineralisations and has source rock potential for hydrocarbons adjacent to potential carbonate reservoir rocks of the partly time-equivalent Wegener Halvø Formation (Harpøth et al. 1986; Surlyk et al. 1986; Stemmerik et al. 1998; Pedersen & Stendal 2000). A better understanding of the sedimentary facies and diagenesis of the Ravnefjeld Formation is therefore crucial for an evaluation of the economic potential of East Greenland.

scholarly journals Types of Void Space in the Bazhenov Reservoir Rocks

Geosciences ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 269
Author(s):  
Olga V. Postnikova ◽  
Alexander V. Postnikov ◽  
Olga A. Zueva ◽  
Artem E. Kozionov ◽  
Ekaterina V. Milovanova ◽  
...  
Keyword(s):  
Western Siberia ◽  
Distribution Patterns ◽  
Void Space ◽  
X Ray Diffraction ◽  
Bazhenov Formation ◽  
Reservoir Rocks ◽  
Oil Reserves ◽  
Light Oil ◽  
Clay Rocks ◽  
High Degree

The deposits of the Bazhenov formation are a unique reservoir of unconventional oil reserves in Western Siberia. They contain both solid organic matter (kerogen) and liquid light oil. The successful development of these hydrocarbons is largely determined by the adequacy of the void space models. The aim of the study is to identify the types of void space in the sediments of the Bazhenov formation and to identify the distribution patterns across the section of the researched wells. The void space was studied by electron and optical microscopy, and the mineral composition of the rocks was determined by X-ray diffraction analysis. The deposits of the Bazhenov productive formation in the territory of Western Siberia are represented by a wide complex of lithotypes, including various kinds of silicites, carbonate, clay rocks, and mixtites. The reservoir space in the reservoir rocks of the Bazhenov formation is a complex and hierarchically subordinated system, which includes voids and fractures of various sizes, configurations, and genesis. The void space of the Bazhenov formation is characterized by a fairly high degree of spatial heterogeneity, which is controlled by lithological, facies, and tectonic factors, as well as the direction of catagenetic processes.

Enhanced and Rock Typing-Based Reservoir Characterization of the Palaeocene Harash Carbonate Reservoir-Zelten Field-Sirte Basin-Libya

2021 ◽  
Author(s):  
Mohamed Masoud ◽  
W. Scott Meddaugh ◽  
Masoud Eljaroshi ◽  
Khaled Elghanduri
Keyword(s):  
Rock Type ◽  
Carbonate Reservoir ◽  
Classification Model ◽  
Reservoir Rocks ◽  
The Core ◽  
Core Samples ◽  
Rock Types ◽  
Rock Typing ◽  
Open Hole ◽  
Type Classification

Abstract The Harash Formation was previously known as the Ruaga A and is considered to be one of the most productive reservoirs in the Zelten field in terms of reservoir quality, areal extent, and hydrocarbon quantity. To date, nearly 70 wells were drilled targeting the Harash reservoir. A few wells initially naturally produced but most had to be stimulated which reflected the field drilling and development plan. The Harash reservoir rock typing identification was essential in understanding the reservoir geology implementation of reservoir development drilling program, the construction of representative reservoir models, hydrocarbons volumetric calculations, and historical pressure-production matching in the flow modelling processes. The objectives of this study are to predict the permeability at un-cored wells and unsampled locations, to classify the reservoir rocks into main rock typing, and to build robust reservoir properties models in which static petrophysical properties and fluid properties are assigned for identified rock type and assessed the existed vertical and lateral heterogeneity within the Palaeocene Harash carbonate reservoir. Initially, an objective-based workflow was developed by generating a training dataset from open hole logs and core samples which were conventionally and specially analyzed of six wells. The developed dataset was used to predict permeability at cored wells through a K-mod model that applies Neural Network Analysis (NNA) and Declustring (DC) algorithms to generate representative permeability and electro-facies. Equal statistical weights were given to log responses without analytical supervision taking into account the significant log response variations. The core data was grouped on petrophysical basis to compute pore throat size aiming at deriving and enlarging the interpretation process from the core to log domain using Indexation and Probabilities of Self-Organized Maps (IPSOM) classification model to develop a reliable representation of rock type classification at the well scale. Permeability and rock typing derived from the open-hole logs and core samples analysis are the main K-mod and IPSOM classification model outputs. The results were propagated to more than 70 un-cored wells. Rock typing techniques were also conducted to classify the Harash reservoir rocks in a consistent manner. Depositional rock typing using a stratigraphic modified Lorenz plot and electro-facies suggest three different rock types that are probably linked to three flow zones. The defined rock types are dominated by specifc reservoir parameters. Electro-facies enables subdivision of the formation into petrophysical groups in which properties were assigned to and were characterized by dynamic behavior and the rock-fluid interaction. Capillary pressure and relative permeability data proved the complexity in rock capillarity. Subsequently, Swc is really rock typing dependent. The use of a consistent representative petrophysical rock type classification led to a significant improvement of geological and flow models.

scholarly journals Analysis of filtration and electrical properties anisotropy of terrigenous reservoir rocks (for DDB axial zone reservoirs)

2019 ◽  
Keyword(s):  
Electrical Resistivity ◽  
Gas Permeability ◽  
Vertical Direction ◽  
Absolute Permeability ◽  
Electrical Anisotropy ◽  
Reservoir Rocks ◽  
Vertical Permeability ◽  
Irreducible Water Saturation ◽  
Horizontal Permeability ◽  
Filtration Properties

The paper focuses on the filtration and electrical anisotropy coefficients and relationship between vertical and horizontal permeability in sandstone reservoir rocks. Field case study of DDB reservoir rocks. Petrophysical properties and parameters are estimated from core and log data from a Moscovian and Serpukhovian stages of Dnipro-Donetsk Basin (West-Shebelynka area well 701-Bis and South-Kolomak area well 31). Routine core analysis included estimation of absolute permeability, open porosity, irreducible water saturation and electrical resistivity (on dry and saturated by mineralized solution) of 40 core samples along two orthogonal directions. Shale fraction is estimated using well logging data in wells which are analyzed. The authors report that reservoir rocks are represented by compacted poor-porous (φ <10 %), low permeable (k<1mD) laminated sandstone with different ratios of clay minerals (Vsh from 0,03 to 0,7) and high volume of micaceous minerals (in some cases 20-30 %). Research theory. One of the main objectives of the work is to develop empirical correlation between vertical permeability and other capacitive and filtration properties for compacted sandstone reservoirs. A modified Kozeny-Carman equation and the concept of hydraulic average radius form the basis for the technique. Results. Coefficients of the anisotropy of gas permeability (IA) and electrical resistivity (λ) are defined based on the results of petrophysical studies. The experiments proved that IA lies in a range from 0,49 to 5 and λ from 0,77 to 1,06. Permeability and electrical resistivity anisotropy in most cases have horizontal distribution. It has been shown that in West-Shebelynka area sample №1 (depth 4933 m) there is probably no fluids flow in vertical direction and in samples №№3 and 15 fractures have the vertical orientation. We have also found that the values of electrical and filtration anisotropy for all samples of South-Kolomak area are similar, this characterized the unidirectionality in their filtration properties, as well as the fact that the motion of the fluid flow mainly in the horizontal direction. In the studied rocks the degree of anisotropy has been concluded to depend on the volume of clay and micaceous minerals, their stratification, fractures, density, and their orientation. New correlation between vertical permeability, horizontal permeability and effective porosity are developed for Late Carboniferous DDB intervals that are analyzed.

Examples of Fractured Carbonate Reservoir Rocks of Russia and Relationship Between Porosity and Permeability in Carbonate Rocks

2008 ◽  
Author(s):  
George V. Chilingar ◽  
Muhammad Raeef Haroun ◽  
Kseniya I. Bagrintseva
Keyword(s):  
Carbonate Rocks ◽  
Carbonate Reservoir ◽  
Reservoir Rocks ◽  
Fractured Carbonate ◽  
Porosity And Permeability

Observations of Open Fractures in Carbonate Reservoir Rocks, Implications for Fluid Flow Simulations

2009 ◽  
Author(s):  
O.P. Wennberg ◽  
G. Casini ◽  
S. Jonoud ◽  
M.H. Norozi
Keyword(s):  
Fluid Flow ◽  
Carbonate Reservoir ◽  
Open Fractures ◽  
Reservoir Rocks ◽  
Flow Simulations
Sign in / Sign up

Export Citation Format

Share Document