Tectonic And Burial History Of Organic Matter Rich Shale Formations And Shale Gas Enrichment In Jiangxi Province

This dissertation selects the organic matter rich shale formations as the main object in Jiangxi province. Using literature research, field geological investigation, experimental testing method, software simulation, theoretical research system, Tectonic burial history of organic matter rich shale formations and shale gas enrichment are set for the core scientific issues. On the basis of the regional tectonic evolution recovery, restoring the burial histories of organic matter rich shale formations, further study on the allocation of burial history-heat-maturation-hydrocarbon evolution and preservation conditions of shale gas, explore shale gas accumulation pattern in Jiangxi province, then optimize favorable areas for enrichment. the result shows that:The organic matter rich shale formations has been transformed by multiphase tectonic movement including Jinning, Caledonian, Hercynian and Indosinian movements and so on, it has multiple tectonic cycles. In addition to the northwest Jiangxi burial history belong to "early fall late up" type, the northeast Jiangxi and Pingle depression zone burial history are "early up late drop" type, they have experienced multiple subsidence and uplifting stage, their maximum depth are all appeare in the Himalayan period. In the process of hydrocarbon generation exist hydrocarbon generation process for many times. In addition to late Cambrain shale’ hydrocarbon generation peak in the northwest Jiangxi is located in the Silurian, other hydrocarbon generation peak of shle formation is in Jurassic-Paleogene period, and the hydrocarbon generation are accompanied by different degrees of tectonic uplift. The shale in research aera has better sealing property, in addition to the Lishuwo formation and Anyuan formation have a relatively lower seal property, the formation of Piyuancun, Wangyinpu, Guanyintang, Hetagn, Leping, Xiaojiangbian are all have good sealing condition of roof and floor. The Xiuwu synclinorium, Jiurui synclinorium, North syncline, Middle syncline and the eastern of Pingle depression have less faults, their preservation condition are all better than others.Based on the allocation of burial history-hydrocarbon evolution, considering preservation condition, this study has summed up the shale gasenrichment pattern in Jiangxi province. The research reveals that the shale gas has experienced four stages: source rock-cap rock deposition period, initial enrichment stage, continuous enrichment stage(unrest enrichment) and save and finalize the design stage, the save and the control of finalize the design stage is the most important. The save enrichment favorable districts can be divided into five types, and the research has optimized nine save enrichment favorable ares including Xiuwu synclinorium, Jiurui synclinorium and North syncline in Jiangxi province.The paper has 45 figures, 15 tables, and 137 references.