Data for: Calculation of the original abundance of organic matter at high-over maturity: A case study of the Lower Cambrian Niutitang shale in the Micangshan-Hannan Uplift, SW China

The geochemical characteristics of the Niutitang shale source rocks in Micangshan-Hannan Uplift, SW China, including the total organic carbon (TOC), hydrocarbon generation potential yield (S1+S2), thermal maturity and kerogen types, were investigated using the tests of Rock-Eval, C/N elemental analysis, bitumen reflectance (Rb) and organic carbon isotope (δ13Corg).