This research was supported by the Ministry of Land and Resources Special Geological Survey: Upper Paleozoic Marine Shale Gas Geological Survey in Yunnan, Guizhou, Guangxi Region (DD20160178), The Key Laboratory of Unconventional Petroleum Geology of Geological Survey of China Open Fund and the Major National R&D Projects: Study on the Test Method for Shale Structure and Composition at Different Scales with project number: 2016ZX05034-003-006.
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