Geochemical characteristics and indicative significance of trace elements in the Paleocene in Lishui Sag, East China Sea Basin

XU Bo; DIAO Hui; WANG Ning; HE Junhui; SHI Jiacheng; HU Biyao; ZHOU Xiaolin

doi:10.16028/j.1009-2722.2022.117

2022 Vol. 38, No. 12

Article Contents

Article navigation > Marine Geology Frontiers > 2022 > 38(12): 64-74

Next Article Previous Article

XU Bo, DIAO Hui, WANG Ning, HE Junhui, SHI Jiacheng, HU Biyao, ZHOU Xiaolin. Geochemical characteristics and indicative significance of trace elements in the Paleocene in Lishui Sag, East China Sea Basin[J]. Marine Geology Frontiers, 2022, 38(12): 64-74. doi: 10.16028/j.1009-2722.2022.117

Citation:

XU Bo, DIAO Hui, WANG Ning, HE Junhui, SHI Jiacheng, HU Biyao, ZHOU Xiaolin. Geochemical characteristics and indicative significance of trace elements in the Paleocene in Lishui Sag, East China Sea Basin[J]. Marine Geology Frontiers, 2022, 38(12): 64-74. doi: 10.16028/j.1009-2722.2022.117

Geochemical characteristics and indicative significance of trace elements in the Paleocene in Lishui Sag, East China Sea Basin

1.
CNOOC Central Laboratory，CNOOC EnerTech-Drilling & Production Co. , Shanghai 200941, China
2.
Shanghai Branch of CNOOC (China) Ltd., Shanghai 200335, China

Received Date: 19 April 2022

Publish Date: 28 December 2022

Abstract

Abstract

Trace elements of the Paleocene strata from several exploration wells in the Lishui Sag were analyzed and the characteristics of paleosalinity, paleoclimate, redox environment, paleowater depth, and paleoproductivity were systematically discussed, to identify the main factors of the formation and development of high-quality source rocks in the sag. Results show that the Paleocene strata are relatively enriched in Li, Ti, V, Zn, Ga, Rb, Ba, Hf, and Th elements, but relatively depleted in Cr, Mn, Co, Ni, Cu, Sr, Nb, Zr, Ta, and U elements in comparison to those in the upper crust of the earth. The parent rocks are mainly related to acidic magmatic rocks. The paleoenvironment of the Paleocene deposits was a relatively shallow fresh-brackish water as indicated by the contents of Li, Sr, Ni, Ga, and Sr/Ba. The paleoclimate was dry and hot with a certain vertical variation as revealed by the changes in Sr/Cu ratio. The paleoclimate in the early-middle Paleocene was hot and arid, and the late Paleocene was in alternation from warm-humid, dry-hot, to warm-humid. The paleo-depositional redox condition was weakly oxidized to weakly reduced as unveiled by Ni/Co, V/Sc and Mo contents. The paleo- productivity was relatively high with high hydrocarbon generation potential. In particular, Lingfeng Formation has the highest productivity and greater exploration potential. It is found that the content of total organic carbon of the Paleocene samples is positively correlated with paleoproductivity parameters, redox conditions, water salinity parameters, and paleoclimate parameters. Many factors indicating sedimentary environment play a synergistic role in controlling the development of high-quality source rocks in the Lishui Sag.
- Paleocene /
- source rock /
- organic matter enrichment /
- trace elements /
- depositional environment /
- main controlling factor /
- Lishui Sag

FullText(HTML)

References

[1]	陈晓东,蒋一鸣,漆滨汶,等. 东海丽水凹陷古新统非典型湖相烃源岩及油气特征[J]. 海洋地质前沿,2021,37(4):25-38. doi: 10.16028/j.1009-2722.2021.039 CrossRef Google Scholar
[2]	侯国伟,刘金水,蔡坤,等. 东海丽水凹陷古新统源-汇系统及控砂模式[J]. 地质科技情报,2019,38(2):65-74. doi: 10.19509/j.cnki.dzkq.2019.0208 CrossRef Google Scholar
[3]	葛和平,陈志勇,方来富,等. 丽水凹陷油气成藏期次探讨[J]. 中国海上油气(地质),2003,17(1):44-50. Google Scholar
[4]	葛和平,陈晓东,刁慧,等. 东海盆地丽水凹陷原油地球化学特征及油源分析[J]. 中国海上油气,2012,24(4):8-12,31. doi: 10.3969/j.issn.1673-1506.2012.04.002 CrossRef Google Scholar
[5]	申雯龙,漆滨汶. 东海盆地丽水凹陷有效烃源岩判定及分布预测[J]. 地质科技通报,2020,39(3):77-88. Google Scholar
[6]	刘俊海,吴志轩,于水,等. 丽水凹陷古新统微量元素地球化学特征及其地质意义[J]. 中国海上油气,2005,17(1):8-11. doi: 10.3969/j.issn.1673-1506.2005.01.002 CrossRef Google Scholar
[7]	周士科,徐长贵. 轴向重力流沉积:一种重要的深水储层:以东海盆地丽水凹陷明月峰组为例[J]. 地质科技情报,2006,25(5):57-62. Google Scholar
[8]	田兵,庞国印,王琪,等. 叠合断陷盆地油气成藏条件分析:以东海丽水-椒江凹陷为例[J]. 岩性油气藏,2012,24(5):32-37. doi: 10.3969/j.issn.1673-8926.2012.05.006 CrossRef Google Scholar
[9]	梁万乐,李贤庆,魏强,等. 库车坳陷北部山前带中生界泥岩元素地球化学特征及其沉积环境意义[J]. 矿业科学学报,2019(5):375-383. doi: 10.19606/j.cnki.jmst.2019.05.001 CrossRef Google Scholar
[10]	刘钦甫, 杨晓杰, 丁述理. 华北晚古生代煤系高岭岩微量元素和稀土元素地球化学研究. 地球化学, 1998, 27（2）: 196-203 Google Scholar
[11]	邓宏文, 钱凯. 沉积地球化学与环境分析[M]. 兰州: 甘肃科学技术出版社, 1993: 18-28. Google Scholar
[12]	李进龙,陈东敬. 古盐度定量研究方法综述[J]. 油气地质与采收率,2003,10(5):1-3. doi: 10.3969/j.issn.1009-9603.2003.05.001 CrossRef Google Scholar
[13]	文华国,郑荣才,唐飞,等. 鄂尔多斯盆地耿湾地区长6段古盐度恢复与古环境分析[J]. 矿物岩石,2008,28(1):114-120. doi: 10.3969/j.issn.1001-6872.2008.01.016 CrossRef Google Scholar
[14]	孔凡翠,杨瑞东,魏怀瑞,等. 贵州威宁草海第四系窑上组沉积物微量元素地球化学特征及其古环境意义[J]. 海洋地质与第四纪地质,2011,31(5):117-126. Google Scholar
[15]	张才利,高阿龙,刘哲,等. 鄂尔多斯盆地长7油层组沉积水体及古气候特征研究[J]. 天然气地球科学,2011,22(4):582-587. Google Scholar
[16]	范玉海,屈红军,王辉,等. 微量元素分析在判别沉积介质环境中的应用:以鄂尔多斯盆地西部中区晚三叠世为例[J]. 中国地质,2012,39(2):382-389. Google Scholar
[17]	张茂盛,廖健德,刘清明,等. 微量元素在地质沉积环境中的应用[J]. 广西师范大学学报:自然科学版,2003,21(1):19-21. Google Scholar
[18]	王永炜,李荣西,高胜利,等. 渤海湾盆地黄骅坳陷湖相碳酸盐岩微量元素特征及沉积环境[J]. 石油实验地质,2017,39(6):849-857. doi: 10.11781/sysydz201706849 CrossRef Google Scholar
[19]	颜佳新,徐四平,李方林. 湖北巴东栖霞组缺氧沉积环境的地球化学特征[J]. 岩相古地理,1998,18(6):27-31. Google Scholar
[20]	吴朝东,杨承运,陈其英. 湘西黑色岩系地球化学特征和成因意义[J]. 岩石矿物学杂志,1999,18(1):26-39. Google Scholar
[21]	NICHOLLS G D. Trace elements in sediments:an assessment of their possible utility as depth indicators[J]. Marine Geology,1967,5(5/6):539-555. Google Scholar
[22]	徐博,曾文倩,刁慧,等. 东海盆地西湖凹陷平湖组微量稀土元素对古生产环境的指示意义[J]. 海洋地质与第四纪地质,2021,41(3):72-84. doi: 10.16562/j.cnki.0256-1492.2020082402 CrossRef Google Scholar
[23]	JONES B,MANNING D A C. Comparison of geochemical indices used for the interpretation of palaeoredox conditions in ancient mudstones[J]. Chemical Geology,1994,111(1/4):111-129. Google Scholar
[24]	谢国梁,沈玉林,赵志刚,等. 西湖凹陷平北地区泥岩地球化学特征及其地质意义[J]. 地球化学,2013,42(6):599-610. doi: 10.19700/j.0379-1726.2013.06.008 CrossRef Google Scholar
[25]	李浩,陆建林,李瑞磊,等. 长岭断陷下白垩统湖相烃源岩形成古环境及主控因素[J]. 地球科学,2017,42(10):1774-1786. Google Scholar
[26]	彭海艳,陈洪德,向芳,等. 微量元素分析在沉积环境识别中的应用:以鄂尔多斯盆地东部二叠系山西组为例[J]. 新疆地质,2006,24(2):202-205. doi: 10.3969/j.issn.1000-8845.2006.02.022 CrossRef Google Scholar
[27]	田正隆,陈绍勇,龙爱民. 以Ba为指标反演海洋古生产力的研究进展[J]. 热带海洋学报,2004,23(3):78-86. Google Scholar
[28]	TATLOR S R, MCLENNAN S M. The continental Crust: its composition and evolution: an examination of the Geochemical record preserved in sedimentary rocks[M]. Oxford: Blackwell , Scientific Publications, 1985: 312. Google Scholar
[29]	陈慧,解习农,李红敬,等. 利用古氧相和古生产力替代指标评价四川上寺剖面二叠系海相烃源岩[J]. 古地理学报,2010,12(3):324-333. doi: 10.7605/gdlxb.2010.03.008 CrossRef Google Scholar
[30]	韦恒叶. 古海洋生产力与氧化还原指标:元素地球化学综述[J]. 沉积与特提斯地质,2012,32(2):76-88. doi: 10.3969/j.issn.1009-3850.2012.02.012 CrossRef Google Scholar