Occurrence, Classification and Formation Mechanisms of the Organic-Rich Clasts in the Upper Paleozoic Coal-Bearing Tight Sandstone, Northeastern Margin of the Ordos Basin, China
The detailed characteristics and formation mechanisms of organic-rich clasts (ORCs) in the Upper Paleozoic tight sandstone in the northeastern margin of the Ordos Basin were analyzed through 818-m-long drilling cores and logging data from 28 wells. In general, compared with soft-sediment clasts docu...
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doaj-f61defcded214f87b7b92512ae74c5fa2020-11-25T02:13:43ZengMDPI AGEnergies1996-10732020-05-01132694269410.3390/en13112694Occurrence, Classification and Formation Mechanisms of the Organic-Rich Clasts in the Upper Paleozoic Coal-Bearing Tight Sandstone, Northeastern Margin of the Ordos Basin, ChinaGuanqun Yang0Wenhui Huang1Jianhua Zhong2Ningliang Sun3School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, ChinaSchool of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, ChinaSchool of Geosciences, China University of Petroleum, Qingdao 266580, ChinaSchool of Geosciences, China University of Petroleum, Qingdao 266580, ChinaThe detailed characteristics and formation mechanisms of organic-rich clasts (ORCs) in the Upper Paleozoic tight sandstone in the northeastern margin of the Ordos Basin were analyzed through 818-m-long drilling cores and logging data from 28 wells. In general, compared with soft-sediment clasts documented in other sedimentary environments, organic-rich clasts in coal-bearing tight sandstone have not been adequately investigated in the literature. ORCs are widely developed in various sedimentary environments of coal-bearing sandstone, including fluvial channels, crevasse splays, tidal channels, sand flats, and subaqueous debris flow deposits. In addition to being controlled by the water flow energy and transportation processes, the fragmentation degree and morphology of ORCs are also related to their content of higher plants organic matter. The change in water flow energy during transportation makes the ORCs show obvious mechanical depositional differentiation. Four main types of ORC can be recognized in the deposits: diamictic organic-rich clasts, floating organic-rich clasts, loaded lamellar organic-rich clasts, and thin interlayer organic-rich clasts. The relationship between energy variation and ORCs deposition continuity is rarely studied so far. Based on the different handling processes under the control of water flow energy changes, we propose two ORCs formation mechanisms: the long-term altering of continuous water flow and the short-term water flow acting triggered by sudden events.https://www.mdpi.com/1996-1073/13/11/2694coal-bearing tight sandstoneorganic-rich clastsoccurrenceclassificationsformation mechanismsOrdos Basin |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Guanqun Yang Wenhui Huang Jianhua Zhong Ningliang Sun |
spellingShingle |
Guanqun Yang Wenhui Huang Jianhua Zhong Ningliang Sun Occurrence, Classification and Formation Mechanisms of the Organic-Rich Clasts in the Upper Paleozoic Coal-Bearing Tight Sandstone, Northeastern Margin of the Ordos Basin, China Energies coal-bearing tight sandstone organic-rich clasts occurrence classifications formation mechanisms Ordos Basin |
author_facet |
Guanqun Yang Wenhui Huang Jianhua Zhong Ningliang Sun |
author_sort |
Guanqun Yang |
title |
Occurrence, Classification and Formation Mechanisms of the Organic-Rich Clasts in the Upper Paleozoic Coal-Bearing Tight Sandstone, Northeastern Margin of the Ordos Basin, China |
title_short |
Occurrence, Classification and Formation Mechanisms of the Organic-Rich Clasts in the Upper Paleozoic Coal-Bearing Tight Sandstone, Northeastern Margin of the Ordos Basin, China |
title_full |
Occurrence, Classification and Formation Mechanisms of the Organic-Rich Clasts in the Upper Paleozoic Coal-Bearing Tight Sandstone, Northeastern Margin of the Ordos Basin, China |
title_fullStr |
Occurrence, Classification and Formation Mechanisms of the Organic-Rich Clasts in the Upper Paleozoic Coal-Bearing Tight Sandstone, Northeastern Margin of the Ordos Basin, China |
title_full_unstemmed |
Occurrence, Classification and Formation Mechanisms of the Organic-Rich Clasts in the Upper Paleozoic Coal-Bearing Tight Sandstone, Northeastern Margin of the Ordos Basin, China |
title_sort |
occurrence, classification and formation mechanisms of the organic-rich clasts in the upper paleozoic coal-bearing tight sandstone, northeastern margin of the ordos basin, china |
publisher |
MDPI AG |
series |
Energies |
issn |
1996-1073 |
publishDate |
2020-05-01 |
description |
The detailed characteristics and formation mechanisms of organic-rich clasts (ORCs) in the Upper Paleozoic tight sandstone in the northeastern margin of the Ordos Basin were analyzed through 818-m-long drilling cores and logging data from 28 wells. In general, compared with soft-sediment clasts documented in other sedimentary environments, organic-rich clasts in coal-bearing tight sandstone have not been adequately investigated in the literature. ORCs are widely developed in various sedimentary environments of coal-bearing sandstone, including fluvial channels, crevasse splays, tidal channels, sand flats, and subaqueous debris flow deposits. In addition to being controlled by the water flow energy and transportation processes, the fragmentation degree and morphology of ORCs are also related to their content of higher plants organic matter. The change in water flow energy during transportation makes the ORCs show obvious mechanical depositional differentiation. Four main types of ORC can be recognized in the deposits: diamictic organic-rich clasts, floating organic-rich clasts, loaded lamellar organic-rich clasts, and thin interlayer organic-rich clasts. The relationship between energy variation and ORCs deposition continuity is rarely studied so far. Based on the different handling processes under the control of water flow energy changes, we propose two ORCs formation mechanisms: the long-term altering of continuous water flow and the short-term water flow acting triggered by sudden events. |
topic |
coal-bearing tight sandstone organic-rich clasts occurrence classifications formation mechanisms Ordos Basin |
url |
https://www.mdpi.com/1996-1073/13/11/2694 |
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