02423nab a2200253 4500 20260520000320.0 260224s2016 xxu ing Inglés Deep-water depositional mechanisms and significance for unconventional hydrocarbon exploration A case study from the lower Silurian Longmaxi shale in the southeastern Sichuan Basin mayo 2016 04/07/2016 ; 04/07/2016 21 p. ; 773-794 Transcripción del resumen del autor: The purpose of this work was to study the depositional mechanisms and significance of the Longmaxi shale in the Sichuan Basin in southern China. Seven lithofacies were identified based on the detailed observation of outcrops and cores using petrographic and scanning electron microscope examination of thin sections and other data analyses: (1) laminated calcareous mudstone, (2) laminated carbonaceous mudstone, (3) laminated silty mudstone, (4) laminated claystone, (5) laminated siliceous shale, (6) siltstone, and (7) massive mudstone. The laminated mudstone and laminated claystone originated from suspension deposition, and siliceous shale is associated with ocean upwelling, whereas massive mudstone and siltstone were primarily deposited by turbidity currents. The depositional mechanisms have a great effect on the source rock and reservoir properties. Suspension deposition near oceanic upwelling zones can provide favorable conditions for the production and preservation of organic matter and are thus conducive to the formation of high-quality source rocks (total organic carbon content up to 5.4%). The reservoir storage spaces are primarily interlaminated fractures and organic pores with good physical reservoir properties (high porosity, permeability, and brittle mineral content). Turbidity currents may carry a large quantity of oxygen to the seafloor, resulting in the oxidation of organic matter, which is unfavorable for its preservation. The lithofacies formed by turbidity currents have relatively low total organic carbon contents (average: 5 AAPG Bulletin 100 ARTICULO Liang, Chao 55415 Jiang, Zaixing 55416 Cao, Yingchang 55417 Wu, Minghao 55418 Guo, Ling 55419 Zhang, Chunming 40807 189602 189602 0 0 0 0 257421 BAAB BAAB 2026-03-06 200061842 0 200061842 2026-03-06 00:19:46 2026-03-06 ARTICULO