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Geochemical characteristics of element Qiongzhusi Group in Dianqianbei area and paleoenvironmental significance
WANG Pengwan1, ZOU Chen2, LI Xianjing1, MA Liqiao1, JIANG Liwei2, JIA Dan1, MEI Jue2, HUANG Ling1, CHEN Xiangyang3, LI Qingfei2
(1.Hangzhou Institute of Petroleum Geology, PetroChina, Hangzhou 310023, China;2.Zhejiang Oilfield Company, PetroChina, Hangzhou 310023, China;3.Tuha Division, Logging Company Limited, PetroChina, Hami 838202, China)
Abstract:
The Lower Silurian Longmaxi formation shale gas in southern China has achieved scale benefit development, and the lower Cambrian Qiongzhusi formation is a potential shale gas replacement formation in Dianqianbei area. The study on the geochemical characteristics and paleoenvironment of shale elements has a certain guiding role in the shale gas assessment area of Qiongzhusi formation. Through systematic tests of organic carbon, main trace elements and rare earth elements of well A in the Qiongzhusi formation, combined with logging data, the geochemical parameters of the related elements in black shale in well A are analyzed according to the layer section, and the paleoenvironment and sedimentary model of black shale formation are discussed. The results show that the concentration of main and trace elements in Qiongzhusi formation is related to then TOC content in Dianqianbei exploration area. The ratio of redox sensitive parameters shows that the whole water body in the sedimentary period of Qiongzhusi formation is transformed from hypoxia to oxygen poor to oxidation environment, which is consistent with the retention degree of water body as shown by the Mo/TOC diagram and UEF-MOEF covariant map. The sedimentary period of Qiongzhusi formation in Dianqianbei area is on a passive continental margin. The first section of Qiongzhusi formation is affected by the hydrothermal action, and the paleoproductivity of the first section is relatively high. The anoxic paleoenvironment formed by strong retention of water body in the first sedimentary period is the key to the effective enrichment and preservation of organic matter. The first section is a favorable shale gas exploration section of Qiongzhusi formation in Dianqianbei area.
Key words:  Dianqianbei area  Qiongzhusi formation  elemental geochemistry  ancient environment