干旱区生态环境知识资源中心(Arid): Differential Enrichment of Organic Matter in Saline Lacustrine Source Rocks in a Rift Basin: A Case Study of Paleogene Source Rocks, Dongpu Depression, Bohai Bay Basin

Arid

DOI	10.1007/s11053-020-09671-x
	Differential Enrichment of Organic Matter in Saline Lacustrine Source Rocks in a Rift Basin: A Case Study of Paleogene Source Rocks, Dongpu Depression, Bohai Bay Basin
	Wang, Qifeng 1,2,3; Jiang, Fujie 1,2; Ji, Hancheng 1,2; Jiang, Shu 3; Guo, Fangxin 1,2; Gong, Shuangyi 1,2; Wang, Ze 1,2; Liu, Xiaohan 1,2; Li, Boshi 1,2; Chen, Yuanyuan 1,2; Deng, Qian 1,2
通讯作者	Jiang, Fujie
来源期刊	NATURAL RESOURCES RESEARCH
ISSN	1520-7439
EISSN	1573-8981
出版年	2020
卷号	29 期号:6 页码:4053-4072
英文摘要	Organic matter enrichment in shale is one of the key factors that control shale oil resources; however, studies of the mechanism of organic matter enrichment in shale in saline lacustrine rift basins are still lacking. In this study, analyses of total organic content (TOC), stable isotopes of carbon and oxygen for carbonate, major and trace element, rare earth element, biomarker composition, and field emission-scanning electron microscopy analyses were performed on 31 core samples from the source rocks of the middle interval of the third member of the Shahejie Formation (Es3M). The aims of these analyses were (1) to investigate the controlling effects of paleoenvironment, paleosalinity, redox conditions, dilution, sediment accumulation rate, terrestrial input, and paleoproductivity on organic matter enrichment, (2) to reconstruct the paleoenvironment, and (3) to propose a model of differential accumulation mechanism for organic matter in saline lacustrine source rocks in rift basins. Results show that obvious differences exist in the paleoenvironment of the Es3 M between the southern and northern regions in the Dongpu Depression. The TOC of the northern source rocks is generally greater than that of the southern source rocks. The southern source rocks were mainly deposited in a closed, warm, and humid environment with medium chemical weathering [the chemical index of alteration (CIA) values and Mg/Ca ratios range from 57.9 to 75.8 and 0.08 to 0.61, with averages of 70.93 and 0.19], with fresh-brackish water, weak water stratification, reducing conditions, moderate paleoproductivity (the P/Ti and P/Al ratios range from 0.13 x 10(-4) to 0.26 x 10(-4) (mean 0.18 x 10(-4)) and 5.11 x 10(-3) to 11.31 x 10(-3) (mean 7.62 x 10(-3)), respectively). The northern source rocks were mainly deposited in an open, cold, and arid environment with a weak chemical weathering (CIA values and Mg/Ca ratios range from 57.9 to 75.8 and 0.08 to 0.61, with averages of 70.93 and 0.19), with hypersaline water, strong water stratification, strong reducing condition, moderate paleoproductivity [P/Ti and P/Al ratios range from 0.13 x 10(-4) to 0.26 x 10(-4) (mean 0.18 x 10(-4)) and 5.11 x 10(-3) to 11.31 x 10(-3) (mean 7.62 x 10(-3))]. The paleosalinity, redox condition, paleoproductivity, and terrestrial input controlled the differential enrichment of organic matter in saline lacustrine source rocks. For the southern region, organic matter enrichment increased with increasing paleosalinity, reduction degree, and terrestrial input. Organic matter enrichment of the northern source rocks increased with increasing paleoproductivity, which was mainly due to high water salinity, stable deep paleowater depth, and strong reducing condition.
英文关键词	Organic matter enrichment Saline lacustrine source rocks Paleoenvironment condition Dongpu Depression Rift basin
类型	Article
语种	英语
国家	Peoples R China ; USA
收录类别	SCI-E
WOS记录号	WOS:000524922900001
WOS关键词	RARE-EARTH-ELEMENTS ; PERMIAN LUCAOGOU FORMATION ; DEPOSITIONAL ENVIRONMENT ; RICH SHALE ; GEOCHEMICAL CHARACTERIZATION ; SHAHEJIE FORMATION ; BIYANG DEPRESSION ; SEDIMENTARY-ROCKS ; CARBON CONTENT ; TRACE-ELEMENT
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/315220
作者单位	1.China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China; 2.China Univ Petr, Coll Geosci, Beijing 102249, Peoples R China; 3.Univ Utah, Energy & Geosci Inst, Salt Lake City, UT 84108 USA
推荐引用方式 GB/T 7714	Wang, Qifeng,Jiang, Fujie,Ji, Hancheng,et al. Differential Enrichment of Organic Matter in Saline Lacustrine Source Rocks in a Rift Basin: A Case Study of Paleogene Source Rocks, Dongpu Depression, Bohai Bay Basin[J],2020,29(6):4053-4072.
APA	Wang, Qifeng.,Jiang, Fujie.,Ji, Hancheng.,Jiang, Shu.,Guo, Fangxin.,...&Deng, Qian.(2020).Differential Enrichment of Organic Matter in Saline Lacustrine Source Rocks in a Rift Basin: A Case Study of Paleogene Source Rocks, Dongpu Depression, Bohai Bay Basin.NATURAL RESOURCES RESEARCH,29(6),4053-4072.
MLA	Wang, Qifeng,et al."Differential Enrichment of Organic Matter in Saline Lacustrine Source Rocks in a Rift Basin: A Case Study of Paleogene Source Rocks, Dongpu Depression, Bohai Bay Basin".NATURAL RESOURCES RESEARCH 29.6(2020):4053-4072.