Provenance analysis of Huagang Formation of central belt and Pinghu Formation of Pingbei area in Xihu sag based on image logging
This article is based on the study of macro and micro geological data in the Xihu sag.It utilizes image logging data for lithology,lithofacies,sedimentary facies,and microfacies identification,as well as the analysis of paleocurrent direction.Subsequently,it analyzes the provenance of two zones and two series of strata in Xihu sag,concluding that the provenance area of the Oligocene Huagang Formation in the middle zone is dominated by metamorphic parent rocks from Hupijiao uplift in the northeast,with long-range axial transported deposition,and it is relatively stable;the provenance area of Eocene Pinhu Formation in Pinghu slope zone is dominated by magmatic parent rocks from Haijiao uplift in the west,with short-rang transported deposition,and the facies zone changes quickly on the plane.
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