A Cause Analysis of the High-Content Nitrogen and Low-Content Hydrocarbon in Shale Gas: A Case Study of the Early Cambrian in Xiuwu Basin, Yangtze Region

Table 4

The sealing parameters of shale and its roof and floor in Jiangye-1 of the lower Cambrian Wangyinpu formation. The data of average TOC content and average porosity is referred to Liu et al. [24]. See Figure 1 for the well locations.

Part	Fm.	Lith.	Depth (m)	Avg. TOC (%)	Avg. porosity (%)	Thk. (m)
Roof	Guanyintang	Silty shale	2520~2609.5	2~4	1.2	89.5
Shale gas interval	Wangyinpu	Organic-rich siliceous shale	2609.5~2672	7~14	2.2	62.5
Floor	Piyuanchun	Silty shale	>2672	0.1~0.6	0.7	>50

Fm. = formation; Lith. = lithology; Avg. = average; TOC = total organic carbon; Thk. = thickness.