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Your search keyword '"Qiu, Longwei"' showing total 162 results
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162 results on '"Qiu, Longwei"'

26. Elaborated Porosity and High-Quality Reservoirs in Deeply Buried Coarse-Grained Sediment: Insight of the Sublacustrine Sandy Conglomerates in the Eocene Shehejie Formation (Es4), Dongying Subbasin, Bohai Bay Basin, China

Author

Yang, Yongqiang, primary, Kra, Kouassi Louis, additional, Qiu, Longwei, additional, Yang, Baoliang, additional, Ahmed, Kabir Shola, additional, Donald, Koua Kadio Aka, additional, Qiao, Yupeng, additional, and Habulashenmu, Yerejiepu, additional

Published
2023
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29. Corrigendum to “Source-to-sink analysis of Mesozoic–Cenozoic sandstone-type uranium deposits in the Qaidam Basin” [Ore Geol. Rev. 149 (2022) 105049]

Author

Dong, Daotao, primary, Liu, Renhe, additional, Qiu, Longwei, additional, Li, Qingchun, additional, Wang, Duo, additional, Li, Xin, additional, Yang, Yongqiang, additional, Yu, Guoding, additional, Ma, Pengjie, additional, Zhou, Tengfei, additional, Liu, Zhaowen, additional, Tian, Wen, additional, and Sun, Yali, additional

Published
2022
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36. Sedimentary Processes and Depositional Characteristics of Coarse‐grained Subaqueous Fans along Steep Slopes in a Lacustrine Rift Basin: A Case Study from the Dongying Depression, Bohai Bay Basin, China.

Author

YANG, Baoliang, QIU, Longwei, YANG, Yongqiang, KRA, Kouassi Louis, DONG, Daotao, and KHAN, Danish

Subjects
*SEDIMENTATION & deposition, *SUBMARINE fans, *PETROLEUM prospecting, *RIFTS (Geology), *NATURAL gas prospecting, *TOPOGRAPHY
Abstract

Coarse‐grained subaqueous fans are vital oil and gas exploration targets in the Bohai Bay basin, China. The insufficient understanding of their sedimentary processes, depositional patterns, and controlling factors restricts efficient exploration and development. Coarse‐grained subaqueous fans in the Yong'an area, Dongying Depression, are investigated in this study. These fans include nearshore subaqueous fans, and sublacustrine fans, and their sedimentary processes, depositional patterns and distribution characteristics are mainly controlled by tectonic activity and paleogeomorphology. Nearshore subaqueous fans developed near the boundary fault during the early–middle deposition stage due to strong tectonic activity and large topographic subsidence. Early sublacustrine fans developed at the front of the nearshore subaqueous fans in the area where the topography changed from gentle to steep along the source direction. While the topography was gentle, sublacustrine fans did not develop. During the late weak tectonic activity stage, late sublacustrine fans developed with multiple stages superimposed. Frequent fault activity and related earthquakes steepened the basin margin, and the boundary fault slopes were 25.9°–34°. During the early–middle deposition stage, hyperpycnal flows triggered by outburst floods developed. During the late deposition stage, with weak tectonic activity, seasonal floods triggered hyperpycnal flows, and hybrid event beds developed distally. [ABSTRACT FROM AUTHOR]

Published
2023
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37. Depositional Environment and Lithofacies Analyses of Eocene Lacustrine Shale in the Bohai Bay Basin: Insights from Mineralogy and Elemental Geochemistry.

Author

KHAN, Danish, LIANG, Chao, QIU, Longwei, Kamran, MIRZA, WANG, Yelei, KASHIF, Muhammad, REHMAN, Saif Ur, WANG, Yuzhe, and TENG, Jianbin

Subjects
SHALE, LITHOFACIES, GEOCHEMISTRY, MINERALOGY, SEDIMENTARY structures, EOCENE Epoch
Abstract

The effect of various depositional parameters including paleoclimate, paleosalinity and provenance, on the depositional mechanism of lacustrine shale is very important in reconstructing the depositional environment. The classification of shale lithofacies and the interpretation of shale depositional environment are key features used in shale oil and gas exploration and development activity. The lower 3rd member of the Eocene Shahejie Formation (Es3x shale) was selected for this study, as one of the main prospective intervals for shale oil exploration and development in the intracratonic Bohai Bay Basin. Mineralogically, it is composed of quartz (avg. 9.6%), calcite (avg. 58.5%), dolomite (avg. 7%), pyrite (avg. 3.3%) and clay minerals (avg. 20%). An advanced methodology (thin‐section petrography, total organic carbon and total organic sulfur contents analysis, X‐ray diffraction (XRD), X‐ray fluorescence (XRF), field‐emission scanning electron microscopy (FE‐SEM)) was adopted to establish shale lithofacies and to interpret the depositional environment in the lacustrine basin. Six different types of lithofacies were recognized, based on mineral composition, total organic carbon (TOC) content and sedimentary structures. Various inorganic geochemical proxies (Rb/Sr, Ca/(Ca + Fe), Ti/Al, Al/Ca, Al/Ti, Zr/Rb) have been used to interpret and screen variations in depositional environmental parameters during the deposition of the Es3x shale. The experimental results indicate that the environment during the deposition of the Es3x shale was warm and humid with heightened salinities, moderate to limited detrital input, higher paleohydrodynamic settings and strong oxygen deficient (reducing) conditions. A comprehensive depositional model of the lacustrine shale was developed. The interpretations deduced from this research work are expected to not only expand the knowledge of shale lithofacies classification for lacustrine fine‐grained rocks, but can also offer a theoretical foundation for lacustrine shale oil exploration and development. [ABSTRACT FROM AUTHOR]

Published
2023
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