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Geochemical characteristics and their paleoenvironmental significance of the mudstones from the Lower Cretaceous Bayingebi Formation in the Yin'e Basin
Author: LI Jidong , FU Yuxin, JIANG Feihu, LI Da, WANG Yaming, LIU Yunlong,ZHENG Wei,XING Zhifeng Time: 2022-05-11 Counts:

doi:10.16186/j.cnki.1673-9787.2020050059

Received:2020/05/20

Revised:2020/09/02

Published:2022/05/15

Geochemical characteristics and their paleoenvironmental significance of the mudstones from the Lower Cretaceous Bayingebi Formation in the Yin’e Basin

LI Jidong1, FU Yuxin2, JIANG Feihu1, LI Da2, WANG Yaming1, LIU Yunlong2, ZHENG Wei2, XING Zhifeng2

1.Research Institute of Exploration and Development， Zhongyuan Oilfield Company， Sinopec， Puyang 457001 ， Henan， China;2.College of Resources and Environment， Henan Polytechnic University， Jiaozuo  454000 ， Henan， China

Abstract:The Bayingebi Formation in the Guaizihu Depression is one of the main oil-bearing strata in the Yin'e Basin. Investigating on its sedimentological and paleoclimatic features is of great significance to understand the evolution process of the Guaizihu Depression and to improve the reservoir evaluation of the Bayingebi Formation. For this purpose , trace and rare earth elements of the sampled mudstones from the Bayingebi Formation of the well Gcl were studied to discuss the paleoenvironmental dynamics. A comprehensive geochemical a- nalysis with environmental sensitive trace metals ( such as V,Ni, Sr, Ba, Cu, Ceanom, etc. ) indicated that the Bayingebi Formation experienced from a dry-hot to a warm-humid ,then to a semi-arid climatic state ,and from a saline to a fresh , then to a brackish dysoxic environment. Furthermore , the strong correlation between w(Sr)/ w(Cu) and w(Sr)/w(Ba) indicated that the increase in salinity might have been controlled by the proposed arid climate.Combined with sporopollen analysis, the oil-bearing shales of the Bayingebi Formation were considered here to be deposited in a warm and semi-humid climate , promoting organic matter production and preservation. A saline-brackish environment might have also promoted the enrichment of organic matter and the formation of high-quality oil shales.

Key words:Yin'e Basin;lower cretaceous;Bayingebi Formation;geochemistry of trace element;paleoenvironment

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