Abstract There are several sets of bioclastic dolostone in the Paleogene Shahejie Formation on the north and south of the eastern margin of Shijiutuo uplift,Shijiutuo area, Bohai Sea. The bioclastic dolostone on the south of the eastern margin of Shijiutuo uplift is mainly developed in the Member 2 of Shahejie Formation,while that on the north is mainly developed in the Member 1 of Shahejie Formation. Based on paleontology,thin sections,geochemical data,the petrological and geochemical characteristic are analyzed for the genetic mechanism of the widely developed bioclastic dolostone in this area. According to the rock composition of the bioclastic dolostone,they can be classified into sparry bioclastic dolostone and micrite bioclastic dolostone. Gastropods and ostracodes in the bioclastic dolostone indicate that the bioclastic dolostone on the north and south of Shijiutuo uplift were formed in shallow lake. Pr/Ph values indicate that the bioclastic dolostone in the south formed in an oxidizing environment,while in the north formed in a reducing environment. The carbon and oxygen isotopic values show that the bioclastic dolostone in the south formed in a closed lake with low-temperature and high-salinity environment,and was the result of seepage-reflux dolomitization during the penecontemporaneous period. The compostion of carbon and oxygen isotopes fluctuate greatly in the north. This indicates the bioclastic dolostone was affected by different fluid media in the north. The process of dolomitization in the north can be divided into three stages: seepage-reflux dolomitization during penecontemporaneous period,the isomorphous replacement during burial diagenesis period and hydrothermal action during the late period. It was the result of multi-stage and multi-genesis in the north. This study is of great significance for similar high-quality reservoir prediction.
Fund:Financially supported by the National Science and Technology Major Project of China(No.2016ZX05024-003)
About author: Pan Wenjing,born in 1988,graduated and gained her master degree from China University of Geosciences(Wuhan)in 2013. She is an engineer in Tianjin Branch of CNOOC,and is mainly engaged in research of petroleum geology. E-mail: panwj@cnooc.com.cn.
Cite this article:
Pan Wenjing,Wang Qingbin,Liu Shilei et al. Origin of lacustrine bioclastic dolostone in the Paleogene Shahejie Formation: A case study in Shijiutuo area,Bohai Sea[J]. JOPC, 2017, 19(5): 835-848.
Pan Wenjing,Wang Qingbin,Liu Shilei et al. Origin of lacustrine bioclastic dolostone in the Paleogene Shahejie Formation: A case study in Shijiutuo area,Bohai Sea[J]. JOPC, 2017, 19(5): 835-848.
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