Geochemical characteristics and organic matter enrichment mechanism of black shale in the Upper Triassic Xujiahe Formation in the Sichuan basin: Implications for paleoweathering, provenance and tectonic setting

被引:51
|
作者
Deng, Tao [1 ]
Li, Yong [1 ]
Wang, Zhengjiang [2 ]
Yu, Qian [2 ]
Dong, Shunli [1 ]
Yan, Liang [1 ]
Hu, Wenchao [1 ]
Chen, Bin [1 ]
机构
[1] Chengdu Univ Technol, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610059, Sichuan, Peoples R China
[2] China Geol Survey, Chengdu Ctr, Chengdu 610081, Sichuan, Peoples R China
基金
中国国家自然科学基金;
关键词
Shale gas; Source rock enrichment; Chemical weathering; Depositional environment; Provenance; Xujiahe formation black shale; Sichuan basin; NORTHEASTERN BRITISH-COLUMBIA; EASTERN TIBETAN PLATEAU; CARBON-RICH SEDIMENTS; SOURCE-ROCK CONTROL; COAL-DERIVED-GAS; CHEMICAL INDEX; FORELAND-BASIN; WEATHERING GEOCHEMISTRY; CHINA CONSTRAINTS; SOUTHWEST CHINA;
D O I
10.1016/j.marpetgeo.2019.06.057
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The first, third and fifth members (henceforth referred to as T(3)x(1), T(3)x(3) and T(3)x(5), respectively) of the Upper Triassic coal-bearing Xujiahe Formation black shale are among the most significant hydrocarbon source rocks in the Sichuan basin. Here, we present geochemical data for the Upper Triassic black shales from core from Well LD-1 to determine their paleoenvironmental conditions, paleoweathering, provenance transitions and tectonic setting. The V/(V + Ni) vs. U/Th, V/Cr vs. U/Th and Ni/Co vs. U/Th bivariate plots and the TFe-TOC-TS (total Fe-total organic carbon-total Sulphur) ternary diagram indicate that the synsedimentary redox regime of almost all the shale samples was oxidizing. Ba/Al, Sr/Al and P/Ti data combined with quantitative biogenic Ba data indicate that moderate-high primary paleoproductivity levels prevailed during deposition. The Sr/Cu ratio and C-value combined with the sedimentary features are indicative of warm-humid climate conditions. The Ti/Al deposition rate proxy and decompacted sedimentation rate are positively correlated with the total organic carbon (TOC) content. According to our multiproxy approach, black shale development in the Xujiahe Formation was mainly controlled by the primary productivity level, foreland basin setting, high tectonic subsidence and sedimentation rate and exhibited a limited correlation with water column redox conditions. Through the compilation and calculation of various weathering indices for the Xujiahe black shale, we suggest that caution must be taken when inferring paleoclimate characteristics based on the chemical index of alteration (CIA) because of the influence of multiple nonweathering factors. Provenance-sensitive elemental ratios (Th/Sc vs. Zr/Sc and Co/Th vs. La/Sc) indicate that the elastic contribution to Xujiahe black shales was of a predominantly felsic character. The black shales exhibit a transition from T(3)x(1), T(3)x(3) and T(3)x(5), whereby T(3)x(1) was primarily sourced from the Proterozoic to early Paleozoic strata of the Qinling orogeny, T(3)x(3) was primarily sourced from the Neoproterozoic complex in the Longmen Shan, and T(3)x(5) was primarily sourced from the Songpan-Ganzi flysch strata, which contributed recycled material because of folding and strong southeastward thrusting.
引用
收藏
页码:698 / 716
页数:19
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