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The Lower Cambrian Qiongzhusi shale and the Upper Ordovician–Lower Silurian Wufeng‐Longmaxi shale are major source rocks and important shale gas exploration targets in the Sichuan Basin. Cutting and core samples from two shale gas wells in south‐western Sichuan Basin have been selected for organic matter (OM) reflectance measurement and Raman spectra analysis with the aim to determine maturity. The...
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