Enrichment Characteristics of Normal-Pressure Marine Shale Gas in the Complex Tectonic Zone: A Case Study of the Lower Cambrian Niutitang Formation in Northern Guizhou - Wenjibin Sun; Zhonghu Wu; Yujun Zuo; Chao Pan; Hao Liu; Baofeng Lan; Jianyun Lin; Bin Chen; Qinggang Chen (Journal of Earth Science, 2026)