Geochemical Characteristics and Environmental Implications of Trace Elements of the Paleocene in the West Lishui Sag, East China Sea Basin

Shuai Yang, Qiang Fu, Jinshui Liu, Wenrui Ma, Bing Yang, Zhiwei Zhu and Wen Teng
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Shuai Yang: State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
Qiang Fu: State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
Jinshui Liu: Shanghai Branch Company of CNOOC (China) Ltd., Shanghai 200335, China
Wenrui Ma: Shanghai Branch Company of CNOOC (China) Ltd., Shanghai 200335, China
Bing Yang: State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
Zhiwei Zhu: State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
Wen Teng: State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China

Energies, 2022, vol. 15, issue 15, 1-29

Abstract: Analysis of the sedimentary environment during the clastic formation process is of great significance for reservoir evaluation and desert prediction. This paper focused on the Paleocene in the West Lishui Sag, East China Sea Basin. XRF fluorescence diffraction and carbon and oxygen isotope tests were carried out on core samples from four wells. Based on the geochemical characteristics of the samples and the changes in the elemental ratios, combined with the lithologic characteristics and sedimentary structure of the samples, the paleoclimate, paleosalinity, paleobathymetric, paleoredox, paleotemperature, and other paleoenvironmental characteristics were analyzed. The results show that the characteristics of major and trace elements were similar in the lower Mingyuefeng Formation (E 1 m 2 ), Upper Lingfeng Formation (E 1 l 1 ), Lower Lingfing Formation (E 1 l 2 ), and Yueguifeng Formation (E 1 y). The Paleocene in the West Lishui Sag was mainly in the reducing environment of brackish-salt water with weak water stratification. The water depth showed a trend of becoming deeper, then shallower, and then deeper. The paleoclimate in the West Lishui Sag was warm on the whole. However, the content of Sr became smaller after later deposition, so the calculated paleowater temperature was higher. In addition, oxygen isotopes were affected by diagenesis, resulting in a negative oxygen isotope value. The paleoproductivity was low, and the hydrocarbon generation potential was poor. The content of nutrient elements mainly came from terrigenous input rather than biological origin, and terrigenous intrusion characteristics gradually increased from E 1 y to E 1 m 2 . The study also shows that paleoproductivity was affected by the paleoclimate and paleowater depth. Warm and humid climate and deep water body were conducive to the accumulation of paleoproductivity.

Keywords: Lishui Sag; paleocene; paleoenvironment; XRF; elemental geochemistry (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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