Growth and Distribution of Coal-Measure Source Rocks in Mixed Platform: A Case Study of Carboniferous in Bamai Area, Southwest Tarim Basin, China

Coal-measure source rocks are generally developed in marsh facies under a humid climate and rarely reported carbonate platform or mixed platform. Carboniferous seawater intruded from west to east the Tarim Basin, deposits of interbedded mudstone southwest basin. In recent years, with deepening exploration, nearly 20 m coal seams carbonaceous have been found lagoon’s tidal-flat background. The hydrocarbon generation potential, development, distribution these coal-measure become an important issue for oil gas exploration. Coal mudstones were formation wells BT5, BT10, Lx2. prospect, characteristics formations research topic. authors conducted organic geochemical tests analyses core samples drill cuttings multiple study area, combined focused on identification seams, dark mudstones, depositional via logging cross plots different lithology 3D seismic inversion. results show that BT5 well related set delta-lagoon sedimentary systems widely Karashayi Formation. maximum cumulative thickness is about m, total carbon (TOC) contents 0.15–60%, kerogen types II2-III, vitrinite reflectance (Ro) values 0.78–1.65%. low maturity northwestern area high southeastern changes as burial depth changes. effective such coal, mudstone, all acoustic time (AC) greater than 300 µs/m, density (DEN) less 2.3 g/cm3, but possess gamma ray (GR) values. GR value 75 API between 75–100 100 mudstones. can be identified according inversion impedance (IMP) 7333 m/s·g/cm3. development controlled factors delta significant role exploration Upper Paleozoic this area. measure sandstones expected form self-generation self-storage pools