A multi-scale geological–engineering sweet spot evaluation method for tight sandstone gas reservoirs
The primary reservoir of the Shihehe Formation has complex lithology; some intervals contain mudstone and coal interlayers, and the reservoir is highly heterogeneous. Previous fracturing plans were mostly designed based on experience, and post-fracturing production varies greatly.
Effect of Lamination on Shale Reservoir Properties: Case Study of
The relationship between the porosity and lamination of the Montney Formation can be used to estimate reservoir properties. Our results show that an increased silt lamina in mudstone leads to an increase in the quartz and calcite contents and a decrease in the clay content, which increases the porosity, permeability, and Young''s
The influence of hydrocarbon generation on the sealing capability
Mudstone serves as the dominant caprock in China''s natural gas reservoirs, with numerous mudstone formation exhibiting high OM content and acting
Predicted CO2 water rock reactions in naturally altered CO2 storage reservoir sandstones, with interbedded cemented and coaly mudstone
Reservoir core was mainly quartz rich with open porosity indicating good reservoir potential, quartz grain fracturing was present. MIP porosities range from 9 to 21%, and QEMSCAN open porosity from 4 to 22% and 2 to 17%, with lower porosities associated with a mudstone layer.
(PDF) Mudstone diversity: Origin and implications for source, seal, and reservoir
Mudstone diversity: Origin and implications for source, seal, and reservoir properties in petroleum 2010) that can be used in basin-scale fluid-flow models. Permeability relates closely to pore size so that pore-size distributions of mudstones, and thus capillary
Lithofacies classification and sequence stratigraphic description as a guide for the prediction and distribution of carbonate reservoir
"Khasib" carbonate lithofacies (grainstone, packstone, wackstone, and mudstone) can be discriminated more clearly from cluster analysis based on principal components than from well logs. A combination of principal component analysis (PCA), model-based cluster analysis, and discriminant analysis is used to identify and
Multilayer stress field interference in sandstone and mudstone thin interbed reservoir
1. Introduction Hydraulic fracturing has been widely used in low-permeability reservoirs to achieve economic production. But the efficiency of hydraulic fracturing in sandwiched interbedded reservoirs is not so high, because of the difficulty in
Lithology determination and petrophysical rock typing of
The proposed rock typing can potentially upgrade the development of reservoir models, which are used in the simulation studies. In addition, one can infer that CT scan parameters can have some practical relationships with the dynamic properties of reservoir rock samples, such as permeability and capillary pressure parameters, which
Shale: Sedimentary Rock
Shale is a rock composed mainly of clay-size mineral grains. These tiny grains are usually clay minerals such as illite, kaolinite, and smectite. Shale usually contains other clay-size mineral particles such as quartz, chert, and feldspar. Other constituents might include organic particles, carbonate minerals, iron oxide minerals, sulfide
The role of pH in red-stratum mudstone disintegration in the Three Gorges reservoir area, China, and the associated micromechanisms
The red-stratum mudstone specimens used in this investigation were collected from the Zhujiadian rockslide situated in the Three Gorges reservoir area. First, this investigation was made through exhaustive experiments on these specimens under nine pH conditions ranging from 3 to 11.
Compaction and Micromechanics of a Mudstone Reservoir
Abstract. The deformation of unconventional reservoir rocks is often characterized by a linear elastic constitutive model. However, recent laboratory experiments show substantial plastic volumetric deformation under shear stress. This observation highlights the need of adopting advanced constitutive models to accurately capture this
Sustainability | Free Full-Text | Study on Elastoplastic Damage Coupling of Reservoir Mudstone
Mudstone, a common complex medium in oil and gas reservoirs and with widely distributed micro-pore and micro-fissures, is liable to produce significant damage evolution and plastic deformation under high buried depth stress environments. Based on the analysis of the physical characteristics, the elastoplastic damage coupling mechanical
Classification of reservoir facies using well log and 3D seismic attributes for prospect evaluation and field development
Rocks emit an enormous amount of gamma radiation, which can be used as a proxy for lithology interpretation (Hampson et al., 2005; Rider, 1990). Gamma-ray trends are used as an essential tool for the identification and interpretation of the subsurfaceChow et).
Disintegration law of strongly weathered purple mudstone on the surface of the drawdown area under the conditions of Three Gorges Reservoir
Disintegration behavior of purple mudstone in the drawdown area of the Three Gorges Reservoir (TGR) in China, as a result of exposure to cyclic wetting and drying (WD) conditions, promotes bank
Permeability of the Mercia Mudstone: suitability as caprock to
The Upper Triassic Mercia Mudstone Group (MMG) forms a seal to the Lower Triassic Sherwood Sandstone petroleum reservoirs in the south of England, in the East Irish Sea Basin and in the Southern and Central North Sea (Fig. 1). Porosity, pore size
Mercia Mudstone Group (Triassic) of England and Wales – a
Chronostratigraphical determinations of the formations in the Mercia Mudstone Group are effected mainly by the use of spore and pollen assemblages (Warrington et al., 1980). Recovery of these fossils varies stratigraphically and geographically, however, and the recognition of ''time lines'' within the Mercia Mudstone Group succession is generally
Frontiers | Sensitivity analysis of seismic attributes and oil reservoir
Step f in Step 5 refers to the establishment of a comparison chart based on the selected seismic attributes and logging parameters, including seismic attributes, logging curves, and reservoir parameters. The chart can be used for reservoir predictions of other 4.1.
Mudstones
Mudstones. Fine-grained sedimentary rocks (e.g., shale, mudrock, mudstone, claystone, chert, or chalk) are the most common rocks in the stratigraphic column. They preserve the best archives of Earth''s history for interpreting paleoclimate and paleo-oceanography; influence the flow of groundwater and hydrocarbons; serve as
(PDF) TERMINOLOGY AND THE CLASSIFICATION
The first technical use of shale appeared in The Miners Dictionary published in 1747 by Hooson [5], a term for a "clayey rock, laminated and hardened", and was first recorded in the 18th century
Hydraulic property variations with depth in a loess mudstone
The landslide spans a total length of 95 m and has a width of 130 m. Its thickness ranges between 5–10 m, with an area of 1.24 × 104 m 2 and a volume of approximately 1.24 × 10 5 m 3. The rear
Mudstone : Properties, Compositions, Types » Geology Science
Here are some key characteristics of mudstone: Fine-Grained Texture: Mudstone has a fine-grained texture, with particles that are smaller than 0.0625 mm (classified as clay and silt-sized). The fine nature of the particles contributes to a smooth and often dense appearance. Lack of Fissility:
Mudstone (Mudstone)
Mudstone (Mudstone). This sedimentary rock is unusual for its superfine grains (usually clay or silt) which give it a nearly smooth appearance. Mudstones don''t have many industrial uses, as they tend to be quite soft and breakable. One variety of this stone, shale, can be used decoratively and has also been used as a roofing material for millennia. If
(PDF) Rock Physical Modeling and Seismic Dispersion Attribute Inversion for the Characterization of a Tight Gas Sandstone Reservoir
In principle, various AVO representations can be extended to obtain corresponding seismic dispersion attributes based on the frequency-dependent inversion scheme [4]. However, most existing
Mudstone
Further, while mudstone is a lumped term, it can include purer forms of siltstone, claystone and any variation of the two, even with sand mixed in Lazar et al. (2015). Mudstone intervals are important as they form the boundaries, seals
Mudstone diversity: Origin and implications for source, seal, and reservoir
Mudstone is the most abundant sedimentary rock and variously acts as sources, seals, and shale gas reservoirs in petroleum systems. Many important physicochemical properties of mudstones are strongly influenced by the mineralogy and size of deposited grains, and by diagenetic changes (precompaction and
Sandstones and Sandstone Reservoirs | SpringerLink
In most sedimentary basins we find there is a rather strong reduction in porosity and permeability in sandstone reservoirs from about 3–3.5 km to 4–4.5 km burial depth, corresponding to a temperature range from about 120 to 160°C. This is due in most cases to precipitation of quartz cement and diagenetic illite.
Mudstone diversity: Origin and implications for source, seal, and
Mudstone is the most abundant sedimentary rock and variously acts as sources, seals, and shale gas reservoirs in petroleum systems. Many important
Reservoir characteristics and logging evaluation of gas-bearing
Gas-bearing mudstones and shale have similar reservoir character-istics, and many shale gas production areas in China are often interbedded with mudstone and shale rather
Hydrocarbon Reservoir
Hydrocarbon reservoirs are characterized by seismic, well log, and petrophysical information, which is dissimilar in spatial distribution, scale, and relationship to reservoir properties. Well log measurements are subject to irregularities, which should be addressed while processing the data to obtain consistent and accurate well logs for all the available
Mudstone diversity: Origin and implications for source, seal, and reservoir properties in petroleum systems
Mudstone lithology is a kind of sedimentary rock that contains most of the unconventional hydrocarbon reservoirs. It can also play multiple roles from hydrocarbon generation to storage [12] .
(PDF) Mudstone diversity: Origin and implications for
Three major linked areas of investigation are critical to understanding the variations in behavior of reservoirs in these diverse rocks: (1) Rock Mechanics properties measured across a range of temperatures and
Multiscale Modeling of Meandering Fluvial Reservoir Architecture
Argillaceous intercalations composed of mudstone or silty mudstone are developed in the study area and mainly formed during the intermittent period of flooding [1]. It is determined by well log characteristics that the return of the microelectrode log curve is over 30%, and the amplitude variations of the micronormal log and the microinverse log
(PDF) Laboratory Investigation on Optimum Selection of a Sand Control Method for an Interbedded Sandstone and Mudstone Reservoir
However, currently, most general sand control methods cannot meet the requirements of sand control in interbedded sandstone and mudstone reservoirs (e.g., Bohai Bay oil and gas fields from China).
Quantitative characterization of tight gas sandstone reservoirs
In the framework presented in Fig. 1, establishing appropriate RPM for TGSs is essential for computing 3D-RPTs.As shown by the thin-section images of the TGS reservoirs from the studied region (see Fig. 2), the complex pore space in the solid matrix can be classified into two primary types, namely, spherical pores (stiff pores) and
Laboratory Investigation on Optimum Selection of a Sand Control Method for an Interbedded Sandstone and Mudstone Reservoir
The mudstone is simulated by at least setting the mineral composition according to realistic reservoir data with the accuracy being more than 90% (iv) The test formation sand is used with the standard industry sand. The
(PDF) Reservoir characteristics and logging
To evaluate the reservoir characteristics and exploitation potential of gas-bearing mudstone, a total of 127 mudstone samples from the Shanxi formation were tested by X-ray diffraction (XRD),
(PDF) Permeability of the Mercia Mudstone: suitability as caprock
Academia is a platform for academics to share research papers. Geofluids (2016) 16, 26–42 doi: 10.1111/gfl.12134 Permeability of the Mercia Mudstone: suitability as caprock to carbon capture and storage sites P. J. ARMITAGE1,2, R. H. WORDEN1, D. R
Mudstone diversity: Origin and implications for source, seal, and
Mudstone lithology is a kind of sedimentary rock that contains most of the unconventional hydrocarbon reservoirs. It can also play multiple roles from hydrocarbon
Difference of hydrocarbon generation between argillaceous
A typical example of tight oil reservoirs in China is the lacustrine argillaceous dolomite, which is frequently interbedded with mudstone ( Hou et al., 2022;
Influence of mudstone on coal spontaneous combustion
Pore structure evolution Table 2 gives the pore structure parameters of coal and mudstone. It can be seen that the specific surface area of mudstone is 21.18 times that of coal.
Petrographic Imaging Methods for Characterizing Mudstone Reservoirs
Petrographic Imaging Methods for Characterizing Mudstone Reservoirs 5. enhances focus and reduces signal noise by preventing elec- tron absorption and scattering by the air in the chamber. Magnification is controlled by the area across which the beam is scanned, smaller areas yielding higher magnifica- tions.
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