Distribution of radioactive elements (U, Th) in the upper Paleozoic coal-bearing strata of the eastern Ordos basin

Shen, Yue; Guo, Yinghai; Li, Zhuangfu; Wei, Xinshan; Xue, Liangxi; Liu, Jinbang

doi:10.1016/j.petrol.2017.08.032

Cited by 8 publications

(3 citation statements)

References 27 publications

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“…Well depth and formation gamma value. Volcanic ash deposits are preserved in marine and non-marine sedimentary basins and then converted into clay minerals through diagenesis [10] . Different strata have different natural gamma values.…”

Section: Coal Seam Identificationmentioning

confidence: 99%

Design of positive pulse measurement while drilling system for mine rotary valve mud

Li,

Pang,

Liu

et al. 2024

J. Phys.: Conf. Ser.

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For the drilling of directional wells and horizontal wells, to ensure that the drilling trajectory is drilled in the coal seam in the direction designed before drilling, it is necessary to transmit information without interrupting the drilling process. The drilling fluid pressure pulse is divided into positive pulse, negative pulse, and continuous wave. The positive pulse transmission system with the mechanical structure of the lifting valve is widely used because of its high pulse signal strength and long propagation distance, which can be used in deep wells. With the increase of the information measured in the formation, the lifting valve can not meet the needs of the current information transmission due to the linear motion of the mechanical structure and the low transmission rate. The rotary valve as the pressure signal generation source can improve the pulse generation rate. Therefore, this paper analyzes the working principle and signal generation principle of the rotary valve positive pulse system, and collects the directional data and natural gamma value of the field test.

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Section: Coal Seam Identificationmentioning

confidence: 99%

Design of positive pulse measurement while drilling system for mine rotary valve mud

Li,

Pang,

Liu

et al. 2024

J. Phys.: Conf. Ser.

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“…and Shiqianfeng Fm. from bottom to top (Shen et al, 2006(Shen et al, , 2007(Shen et al, , 2017aZhu, 2016;Li et al, 2020a).…”

Section: Geological Settingmentioning

confidence: 99%

Sedimentology and Paleoenvironmental Characteristics of Fine‐grained Sediments in Coal‐bearing Strata in the Eastern Ordos Basin: A Case Study of the Exploratory Well in the Zizhou Area

Guo

WANG³

et al. 2023

Acta Geologica Sinica (Eng)

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The continuously collected cores from the Permo‐Carboniferous coal‐bearing strata of the eastern Ordos Basin are essential for studying the hydrocarbon potential in this region. This study adopted sedimentological and geochemical methods to analyze the sedimentary environment, material composition, and geochemical characteristics of the coal‐bearing strata. The differences in depositional and paleoclimatic conditions were compared; and the factors influencing the organic matter content of fine‐grained sediments were explored. The depositional environment of the Benxi and Jinci formations was lagoon to tidal flat with weakly reduced waters with low salinity and dry‐hot paleoclimatic conditions; while that of the Taiyuan formation was a carbonate platform and shallow water delta front, where the water was highly reductive. The xerothermic climate alternated with the warm and humid climate. The period of maximum transgression in the Permo‐Carboniferous has the highest water salinity. The Shanxi Formation was deposited in a shallow water delta front with a brackish and fresh water environment and alternative weak reductiveness. And the paleoclimate condition is dry‐hot. The TOC content in fine‐grained samples was averaging 1.52%. The main controlling mechanism of organic matter in this area was the input conditions according to the analysis on input and preservation of organic matter.

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“…The volume fraction of volcanogenic materials was generally between 5.0% and 17.0% in the Upper Palaeozoic sandstone reservoirs of the Ordos Basin (Yang et al, 2006). These volcanogenic materials were determined to be derived from volcanism at the orogenic belt of the Ordos Basin margin (Shen et al, 2017). However, questions still remain: Were the volcanogenic materials in different regions of the same provenance attribute?…”

Section: Introductionmentioning

confidence: 99%

Depositional and diagenetic processes in volcanic matrix‐rich sandstones from the Shanxi and Shihezi formations, Ordos Basin, China: Implication for volcano‐sedimentary systems

et al. 2022

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Volcanic eruptions can provide large amounts of sedimentary materials and expose fluvial valleys or lakes to catastrophic hyperpycnal flood events, but this process has not been documented in detail. The Ordos Basin Permian fluvio‐deltaic system reveals evidence for abundant volcanism linked to the tectonic evolution of orogenic belt around the basin and provides a ‘natural laboratory’ for investigating hyperpycnal flows associated with volcanic activity. This study analysed volcanic matrix‐rich sandstone (VMS) samples for petrology, mineralogy and geochemistry in order to address current and uncertain volcanogenic material provenance explanations and the lack of systematic investigations into the depositional and diagenetic processes of volcanic related sediments in the southwestern basin. By combining tectonic background surveys, detrital zircon geochronology and spatial distribution of volcanogenic materials, it was found that volcanogenic materials were not derived from the Yinshan‐Yanshan Orogenic Belt (YYOB) as previously thought, but instead evidence a southwestern origin from the North Qinling Orogenic Belt (NQOB). Volcanogenic materials retained in the provenance area during frequent volcanic eruptions were transported to the basin via fluvial systems shortly after the eruption. The associated sediments meet the criterion for hyperpycnites based on lithofacies associations, suggesting the occurrence of hyperpycnal flows during the deposition of VMS. During the subsequent burial stage, the VMS became three distinct types defined by their volcanic matrix content and have similar paragenetic sequences but different diagenetic intensities. The differing content of authigenic minerals in the three types was closely related to the sandstone pore structure characteristics and the evolution of volcanic‐matrix alteration materials. This article proposes a possible explanation for the previously unidentified tectonothermal events in the NQOB during the Permian, validating and reinforcing the theoretical work of hyperpycnal flow. This contribution provides new insights and understanding of the depositional and diagenetic processes of lacustrine basins with similar tectonic settings.

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Distribution of radioactive elements (U, Th) in the upper Paleozoic coal-bearing strata of the eastern Ordos basin

Cited by 8 publications

References 27 publications

Design of positive pulse measurement while drilling system for mine rotary valve mud

Design of positive pulse measurement while drilling system for mine rotary valve mud

Sedimentology and Paleoenvironmental Characteristics of Fine‐grained Sediments in Coal‐bearing Strata in the Eastern Ordos Basin: A Case Study of the Exploratory Well in the Zizhou Area

Depositional and diagenetic processes in volcanic matrix‐rich sandstones from the Shanxi and Shihezi formations, Ordos Basin, China: Implication for volcano‐sedimentary systems

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