Hydrocarbon Generation Potential of the Upper Palaeozoic Coal Measure Source Rocks in Su11 Block

Abstract

Based on the analysis of regional geological background, relevant work is carried out through experimental testing, logging evaluation, and reservoir forming characteristics analysis and drilling productivity statistics. The analysis shows that the residual organic carbon content of the Upper Paleozoic coal measure source rocks in the Su 11 block ranges from 40.86% to 70.75%, and the residual organic carbon content of the dark mudstone ranges from 0.51% to 26.80%. The organic matter is mainly composed of vitrinite and inordinate with carbon isotope ranging from -24.81 ‰ to 22.64 ‰ and type 3. The vitrinite reflectance distribution of source rocks is between 1.2% and 2.1%, and is in the mature-high maturity stage. The total gas generation intensity of source rocks is between (10-50) × 10⁸m³ and km². The plane shows “strong north weak” Tight sandstone gas migrates into the reservoir through “near source”, and the gas source conditions have significant control over the gas reservoir distribution.