Organic Matter Accumulation Mechanism in the Lower Cambrian Strata from Well Luntan 1 in the Tarim Basin, NW China
A large amount of light crude oils have been found within 4000 to 7000 m deep strata of Cambrian, Ordovician, and Silurian reservoirs in the Tarim Basin, NW China. To enhance the understanding of parental materials of deep oils, a set of high-quality source rocks from the Yuertusi Formation in well...
Saved in:
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2021-01-01
|
| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2021/6668707 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832550536811905024 |
|---|---|
| author | Qian Deng Haizu Zhang Haozhe Wang Zhiwei Wei Bin Cheng Shida Li Yunpeng Wang Oluwabamise Lekan Faboya Zewen Liao |
| author_facet | Qian Deng Haizu Zhang Haozhe Wang Zhiwei Wei Bin Cheng Shida Li Yunpeng Wang Oluwabamise Lekan Faboya Zewen Liao |
| author_sort | Qian Deng |
| collection | DOAJ |
| description | A large amount of light crude oils have been found within 4000 to 7000 m deep strata of Cambrian, Ordovician, and Silurian reservoirs in the Tarim Basin, NW China. To enhance the understanding of parental materials of deep oils, a set of high-quality source rocks from the Yuertusi Formation in well Luntan 1 (maximum drilling depth of 8882 m) was studied in terms of their sedimentary condition and mechanism of organic matter enrichment. Total organic carbon (TOC) content, carbon isotope of kerogen (δ13Cker), and major and trace elements of the rocks from the Sinian Qigebulake, Cambrian Yuertusi, and Xiaoerbulake Formations in well Luntan 1 were analysed. The results showed that the δ13Cker value of the Yuertusi Formation barely changed with an average of -31.19‰. High TOC contents accompanied by enrichments of the bioessential trace elements, such as cadmium, chromium, copper, nickel, and zinc, occurred in the lower part of the Yuertusi Formation. Excess barium (Baxs) and phosphorus concentrations revealed high primary productivity during the deposition of the Yuertusi Formation. Moreover, variations in the enrichment factors of molybdenum, uranium, and vanadium and molybdenum-uranium covariation pattern indicated suboxic-anoxic conditions in the Qigebulake Formation, anoxic-euxinic conditions in the Yuertusi Formation, and suboxic-oxic conditions in the Xiaoerbulake Formation. The TOC contents were significantly correlated with the paleoproductivity and paleoredox parameters, indicating that high productivity and reducing conditions jointly controlled the organic matter accumulation and preservation in well Luntan 1. |
| format | Article |
| id | doaj-art-16d74e57f1b34672879e2da33b13a67d |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-16d74e57f1b34672879e2da33b13a67d2025-02-03T06:06:29ZengWileyGeofluids1468-81151468-81232021-01-01202110.1155/2021/66687076668707Organic Matter Accumulation Mechanism in the Lower Cambrian Strata from Well Luntan 1 in the Tarim Basin, NW ChinaQian Deng0Haizu Zhang1Haozhe Wang2Zhiwei Wei3Bin Cheng4Shida Li5Yunpeng Wang6Oluwabamise Lekan Faboya7Zewen Liao8State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, ChinaResearch Institute of Petroleum Exploration and Development, PetroChina Tarim Oilfield Company, Korla 841000, ChinaState Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, ChinaState Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, ChinaState Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, ChinaState Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, ChinaState Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, ChinaState Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, ChinaState Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, ChinaA large amount of light crude oils have been found within 4000 to 7000 m deep strata of Cambrian, Ordovician, and Silurian reservoirs in the Tarim Basin, NW China. To enhance the understanding of parental materials of deep oils, a set of high-quality source rocks from the Yuertusi Formation in well Luntan 1 (maximum drilling depth of 8882 m) was studied in terms of their sedimentary condition and mechanism of organic matter enrichment. Total organic carbon (TOC) content, carbon isotope of kerogen (δ13Cker), and major and trace elements of the rocks from the Sinian Qigebulake, Cambrian Yuertusi, and Xiaoerbulake Formations in well Luntan 1 were analysed. The results showed that the δ13Cker value of the Yuertusi Formation barely changed with an average of -31.19‰. High TOC contents accompanied by enrichments of the bioessential trace elements, such as cadmium, chromium, copper, nickel, and zinc, occurred in the lower part of the Yuertusi Formation. Excess barium (Baxs) and phosphorus concentrations revealed high primary productivity during the deposition of the Yuertusi Formation. Moreover, variations in the enrichment factors of molybdenum, uranium, and vanadium and molybdenum-uranium covariation pattern indicated suboxic-anoxic conditions in the Qigebulake Formation, anoxic-euxinic conditions in the Yuertusi Formation, and suboxic-oxic conditions in the Xiaoerbulake Formation. The TOC contents were significantly correlated with the paleoproductivity and paleoredox parameters, indicating that high productivity and reducing conditions jointly controlled the organic matter accumulation and preservation in well Luntan 1.http://dx.doi.org/10.1155/2021/6668707 |
| spellingShingle | Qian Deng Haizu Zhang Haozhe Wang Zhiwei Wei Bin Cheng Shida Li Yunpeng Wang Oluwabamise Lekan Faboya Zewen Liao Organic Matter Accumulation Mechanism in the Lower Cambrian Strata from Well Luntan 1 in the Tarim Basin, NW China Geofluids |
| title | Organic Matter Accumulation Mechanism in the Lower Cambrian Strata from Well Luntan 1 in the Tarim Basin, NW China |
| title_full | Organic Matter Accumulation Mechanism in the Lower Cambrian Strata from Well Luntan 1 in the Tarim Basin, NW China |
| title_fullStr | Organic Matter Accumulation Mechanism in the Lower Cambrian Strata from Well Luntan 1 in the Tarim Basin, NW China |
| title_full_unstemmed | Organic Matter Accumulation Mechanism in the Lower Cambrian Strata from Well Luntan 1 in the Tarim Basin, NW China |
| title_short | Organic Matter Accumulation Mechanism in the Lower Cambrian Strata from Well Luntan 1 in the Tarim Basin, NW China |
| title_sort | organic matter accumulation mechanism in the lower cambrian strata from well luntan 1 in the tarim basin nw china |
| url | http://dx.doi.org/10.1155/2021/6668707 |
| work_keys_str_mv | AT qiandeng organicmatteraccumulationmechanisminthelowercambrianstratafromwellluntan1inthetarimbasinnwchina AT haizuzhang organicmatteraccumulationmechanisminthelowercambrianstratafromwellluntan1inthetarimbasinnwchina AT haozhewang organicmatteraccumulationmechanisminthelowercambrianstratafromwellluntan1inthetarimbasinnwchina AT zhiweiwei organicmatteraccumulationmechanisminthelowercambrianstratafromwellluntan1inthetarimbasinnwchina AT bincheng organicmatteraccumulationmechanisminthelowercambrianstratafromwellluntan1inthetarimbasinnwchina AT shidali organicmatteraccumulationmechanisminthelowercambrianstratafromwellluntan1inthetarimbasinnwchina AT yunpengwang organicmatteraccumulationmechanisminthelowercambrianstratafromwellluntan1inthetarimbasinnwchina AT oluwabamiselekanfaboya organicmatteraccumulationmechanisminthelowercambrianstratafromwellluntan1inthetarimbasinnwchina AT zewenliao organicmatteraccumulationmechanisminthelowercambrianstratafromwellluntan1inthetarimbasinnwchina |