The shale of the Upper Ordovician Wufeng Formation and the Lower Silurian Longmaxi Formation in the Xichang Basin is the main replacement horizon for the shale gas exploration being conducted in the Sichuan Province, except for the Sichuan Basin. The fine identification and classification of the types of shale facies are important …
Based on the comprehensive analysis of the mineral ternary diagram, TOC content, and lithofacies type classification, six lithofacies assemblages are identified in shales of the Dongyuemiao Formation in the Fuxing area: LF1–LF6: it is mainly identified in Unit 1, and multi-stage transgressive and regressive cycle sequences can be identified ...
A total of 7 facies associations are interpreted and consist of 14 distinct lithofacies, with lithologies including conglomerates, sandstones, siltstones, mudstones, shales, and coals. ... northeastern, and northeastern parts of the Erlian Basin, respectively. Three coal depositional models were summarized in the sequence stratigraphic ...
The deposits within the MB2 member of the Mishrif Formation exhibit a division into five distinct lithofacies associations (Table 1): (1) subtidal mudstone to wackestone (LF-1); back-margin massive wackestone to packstone (LF-2); (2) high-energy bioclastic grainstone (LF-3); (3) swamp carbonaceous mudstone interbedded with …
The coal seams of the Shanxi formation are unevenly distributed. Coals with lower sulfur content are formed in the peat swamps of the deltaic-fluvial system. The author's research, however, shows that the coal seams of the Benxi and Taiyuan Formation are formed in coal-forming environments of the marine facies.
S 1 corresponds to the Benxi Formation and the lower part of Taiyuan Formation, S 2 corresponds to the middle and upper parts of Taiyuan Formation, and S 3 corresponds to the Shanxi Formation. The lithofacies paleogeography maps of three sequences are reconstructed based on the contours of a variety of lithological …
Coal: The main coal-forming environment in the research area was the mires formed in a tidal flat-lagoon environment and an interdistributary bay environment. The …
Coal development is controlled both by sequence stratigraphic framework and lithofacies-paleogeography units. Shallow lauctrine and delta units, coastal plain, gulf and tidal-lagoon units during ...
The Eagle Ford formation is carbonate- and organic-rich shale deposited in the Late Cretaceous. The Austin Chalk is the overlying formation that is mainly made up of chalk and marl interbedded. ... Estimation of ash, moisture content and detection of coal lithofacies from well logs using regression and artificial neural network modelling. Fuel ...
The upper Permian Longtan Formation is widely distributed in southwestern China and is well known for multilayer coal and high organic shale, with significant shale gas potential that has yet to be fully explored and developed. ... bioclastic-bearing sandstone, fine sandstone, and coal seam. (3) The six typical lithofacies assemblages …
thick) and the Paleocene coal-bearing Hangu Formation (5 to 50 m thick) in the Surghar Range of north-central Paki-stan is complex. Both formations contain remarkably simi-lar lithofacies: one or two types of sandstone lithofacies; a combined lithofacies of mudstone, claystone, carbonaceous shale, and coal beds; and a rare carbonate …
The depositional facies, sequence stratigraphy, palaeogeography, and coal accumulation in the fluvio-lacustrine Middle Jurassic Xishanyao Formation in the central Zhunnan (central segment of the southern Junggar Basin) coalfield, northwest China were analyzed based on outcrops, well cores, and geophysical well logs. Thirteen …
This study focuses on coal petrog., mineralogy, Rock-Eval pyrolysis, and the meso-and microporosity characteristics of the coal samples collected from several Late …
The Longtan Formation and Changxing Formation are the main coal-bearing series in the Lopingian. The Longtan Formation was mainly formed in a sea-land …
Type 1 coarse-grain pebbly sandstone lithofacies association. This is the most dominant type of lithofacies association constituting the lower and middle part of the upper member of the formation (Fig. 3).It is comprised of thin, laterally discontinuous wedge shaped layers of intraformational conglomerate passing up-section into coarse …
Download Citation | Lithofacies analysis and paleosedimentary evolution of Taiyuan Formation in Southern North China Basin | The Permian Taiyuan Formation contains alternate shale and coal ...
Environments of coal formation in the North China region during the Carboniferous and Permian have been widely studied by many institutions and scholars in China (e.g., Shang 1997; Cheng 1992).Chinese geologists have put forward numerous theories on coal-accumulating models, such as (1) the tidal flat coal-accumulation model, (2) the delta …
The Gwembe Coal Formation represents fluvial deposition of sandstones, siltstones and mudstones in channels and on the floodplains. Fourteen lithofacies in the formation are grouped into four facies associations, namely Maamba Sandstone, Coal, Mudrock and Sandstone A facies. The Maamba Sandstone facies association is …
The sediments deposited on shallow marine shelf which extended as an embayment and there is lateral variation of the lithofacies which consequently led to the diverse types of lithostratigraphic units (GSI, 1981, 1989). ... This is indicated in the formation of thin beds of coal (0.3-2.0 m) because of shifting of distributary channels …
The coal-bearing strata include the Lower Jurassic Reshui and the Middle Jurassic Muli and Jiangcang Formations. Lithofacies including conglomerates, sandstones, mudstones, and coal were identified and have been interpreted to be formed in environments ranging from braided fluvial, braided fluvial delta, to lacustrine.
The Balikpapan Formation coal and coaly shale samples exhibit a range of HI values from 73 to 252 mg HC/g TOC. ... Lithofacies of the Balikpapan Formation include …
When averaged across the four wells, the Yarragadee Formation shows quite an even distri- bution of lithofacies, whereas the cored intervals of Cadda Forma- tion and Cattamarra Coal Measures ...
In addition, gray colored coal lithofacies clustered in the heavy thorium-bearing minerals ranges resulted in higher GR values among the coal in the geological formation. Figure 8
Upper Permian Longtan Formation Coal Measures in the Western Guizhou Region, South China Xiaoming Li, Xuan Tang,* Shaobin Guo, Jinchuan Zhang, Ende Deng, and Chaoli Lan ... and coal seam. (3) The six typical lithofacies assemblages were developed in the Longtan Formation, which represented differentsedimentary environments of the …
This chapter reviews the characteristics and evolution of lithofacies paleogeography of marine strata in China based on sequence stratigraphy. It covers the …
DOI: 10.1016/j.marpetgeo.2024.106692 Corpus ID: 266833367; Reservoir characteristics and controlling factors of the middle–high maturity multiple lithofacies reservoirs of the Lianggaoshan Formation shale strata in the northeastern Sichuan basin, China
lithofacies relations of rock types in the Patala Formation indicate that the sandstone bodies were deposited as foreshore, tidal-channel, and washover-fan units.
The Shanxi Formation is composed mainly of sandstone, siltstone, mudstone, and coal seams, while the Taiyuan Formation mainly consists of sandstone, siltstone, limestone, sandy mudstone, and coal ...
The late middle to late Eocene Skookumchuck Formation is well exposed in highwalls of the Centralia mine, southwest Washington. Three coal zones and intervening sandstone-rich successions occur in a 220-m-thick interval that extends from below the Smith to above the Tono No. 1 coal beds.
The lithofacies types of limited platform shale and tidal flat shale were different and relatively single, ... (Tang et al., 2016). In this formation, the coal seam was thin, usually dominated by coal lines, while the dark shale had a large cumulative thickness with a high abundance of organic matter (Chen et al., 2016). In addition, the ...
Lithofacies and Palynostratigraphy of Some Cretaceous and Paleocene Rocks, Surghar and Salt Range Coal Fields, Northern Pakistan. By Peter D. Warwick, Shahid Javed, S. Tahir A. Mashhadi, Tariq Shakoor, Asrar M. Khan, and A. Latif Khan ... Age of the Lumshiwal Formation; Lithofacies of the Hangu Formation. Coal Characteristics of …
In this paper, we investigated depositional environments, sequence stratigraphy, lithofacies paleogeography and coal accumulation pattern of five major coal-accumulating periods including the Late Carboniferous to Middle Permian of the North China CAA, the Late Permian of the …
In this paper, we investigated depositional environments, sequence stratigraphy, lithofacies paleogeography and coal accumulation pattern of five major coal-accumulating periods including the...
The Balikpapan Formation coal and coaly shale samples exhibit a range of HI values from 73 to 252 mg HC/g TOC. ... Lithofacies of the Balikpapan Formation include conglomerate and sandstone (Cst), planar cross-bedded sandstone (Sp), massive sandstone (Sm), trough cross-bed sandstone (St), ripple cross-laminated sandstone (Sr), hummocky cross ...
The lithofacies paleogeography maps based on third-order sequences were reconstructed and the distribution of coal accumulation centers and coal-rich belts were predicted. Distribution of coal ...
The Longtan Formation of the Upper Permian in the Sichuan Basin has become a significant target for shale gas exploration in recent years. Multiple methods, including outcrop observations, thin sections, total organic matter content, X-ray diffraction and scanning electron microscopy were used to investigate the mineralogy, shale …
Gas exploration and reservoir development in the Baryulah area, Cooper Basin, southwest Queensland has focussed on the fluvial-lacustrine, Permian coal-bearing Patchawarra Formation, Murteree ...
Lithofacies associated within point bars have been well documented and an established link between deposition process, depositional form, and reservoir properties has been developed (Bridge and Tye, 2000; Hein and Cotterill, 2006; Hubbard et al., 2011; Smith, 1987).Point bar lithofacies form genetically related associations deposited in a …
Thin sections showing the typical fine-grained lithofacies of the Permian Longtan Formation in the western Guizhou region. (a) Silty mudstone, with directional distribution of mineral particles ...