Preliminary study of pore structure and methane sorption capacity of the Lower Cambrian shales from the north Gui-zhou Province

A comparison study on hydrocarbon composition in bitumens I and II from Lower Cambrian marine shales in Guizhou Province, South China


 In this study, we conducted systematic analysis of total organic carbon (TOC) content, lipid biomarkers, carbon isotopes of kerogen (δ13Ckerogen), and mineral composition in Niu-ti-tang (Є1n) and Pa-lang (Є1p) shales from Guizhou Province in order to provide a better understanding of the organic sources and marine environmental condition during deposition of the Lower Cambrian shales of South China. The results show that a broad variety of lipid biomarkers, such as n-alkanes, pristane, phytane, terpanes, hopanes, and steranes, are in these shales, which suggests a significant contribution of various paleobios with bacterial microorganisms and algae thriving under a low-salinity and stable anoxic environment. The negative δ13Ckerogen value (minimum −36.4‰) and occurrence of pyrite (1–7.5%) and carbonates (2.4–57.3%) indicate that bacterial sulfate reduction prevailed under anoxic conditions during deposition of the Lower Cambrian shales. Moreover, the difference in mineral and δ13Ckerogen composition between Є1n and Є1p shales might imply significant changes in primary production and paleoocean environments due to sea-level rise, as shown by the higher average TOC content in Є1p shales (2.52%) compared to that in Є1n shales (1.79%). The covariances of TOC content and mineral and δ13Ckerogen composition suggest that the Є1p shales might have been deposited under a higher sea level associated with high primary productivity, compared to Є1n shales. Thus, high primary productivity driven by sea-level rise is suggested to be the main controlling factor on organic matter enrichment in Є1p shales under stable anoxic conditions.

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Geochemical Characteristics and Their Marine Environmental and Organic Source Implications for the Lower Cambrian Shales in Guizhou Province, South China

The Cili-Dayong region in northwestern Hunan lay on the passive continental margin of the southeastern Yangtze landmass during the Late Sinian to Cambrian. The bulk of the Upper Sinian strata are represented by the carbonate rocks, while the Lower Cambrian strata consist dominantly of a variety of shales and limestones. The above-mentioned strata within the platform-margin to slope facies zones are divided in this study, on the basis of sequence boundary, depositional characteristics, parasequences, systems tracts and transitional surfaces and outcrop sequence stratigraphy, into eleven third-order type 2 sequences, including seven for the Upper Sinian strata and four for the Lower Cambrian strata. Other aspects of outcrop sequence stratigraphic analysis are dealt with as well.

Sequence stratigraphic division of the Upper Sinian-Lower Cambrian strata in the Cili-Dayong region, northwestern Hunan

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Sequence stratigraphic division of the Upper Sinian-Lower Cambrian strata in the Cili-Dayong region, northwestern Hunan