景谷凹陷下二叠统古油藏成藏过程及勘探启示

he Jinggu Depression exhibits promising potential for oil and gas exploration. Clarifying the hydrocarbon accumulation and modification processes of oil and gas reservoirs holds significant importance for guiding future exploration efforts. This study investigates the hydrocarbon accumulation process through research on the characteristics of paleo-reservoirs, hydrocarbon sources, hydrocarbon generation evolution, and tectonic evolution history. Additionally, the processes of hydrocarbon adjustment and destruction are analyzed from both macroscopic and microscopic perspectives.The results demonstrate that:The oil in the Lower Permian paleo-reservoir of the Y structure in the Jinggu Depression originates from the Upper Carboniferous mudstone source rocks, forming a "lower-source and upper-reservoir" configuration with the Lower Member of the Lazhuhe Formation sandstone in the Lower Permian.The trap formation history shows favorable spatiotemporal coupling with the hydrocarbon generation and expulsion history of the source rocks. Hydrocarbon charging primarily occurred during the Jurassic-Cretaceous period through fracture-dominated migration pathways.The Yanshanian Movement and Himalayan Movement induced intense fold deformation and extensive faulting, leading to reservoir destruction.Further exploration in the Jinggu Depression should focus on paleo-uplift areas with favorable preservation conditions.