Division of volcanic eruption stages and distribution patterns of volcanic rocks in Yingcheng Formation of Xujiaweizi fault depression, Songliao Basin
Based on a large number of drilling cores, thin sections, well logs, isotope age and three-dimensional seismic data, the coal-bearing pyroclastic sedimentary interlayer of the Ying 2 Member was used as the standard layer, and the volcanic stratigraphic interface was identified through well log curves, combined with the Gd obtained from ECS logs. and Ti elements to identify the type of volcanic stratigraphic interface, and establish the "three sections and six phases" volcanic stratigraphic sequence of the Yingcheng Formation in the Xujiaweizi Fault Depression in the northern Songl
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