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利用地震、测井及地球化学资料,结合盆地模拟技术,对瓯江凹陷构造演化、古地温及超压演化进行了系统研究,结果表明:瓯江凹陷经历了断陷、拗陷和区域沉降3个构造演化阶段,构造演化控制了沉积体系的发育与展布,发育了月桂峰组、灵峰组和明月峰组3套烃源岩。研究区古地温场经历了埋藏升温—抬升降温—埋藏升温的演化过程,且西次凹经历的古温度高于东次凹。这种差异性热演化控制了研究区烃源岩的生烃作用,瓯江凹陷西次凹烃源岩成熟度明显高于东次凹。瓯江凹陷发育有异常高压,且经历了增压—泄压—增压的过程,异常高压为油气的运移提供了驱动力。构造演化、热流和生烃作用以及动态超压的积累与释放,三者联合控制了瓯江凹陷的油气成藏,但三者在时间上要相互匹配,相互耦合才能促进油气成藏。
Based on the seismic, logging and geochemical data and basin analogue techniques, the tectonic evolution, paleo-geothermal and overpressure evolution of the Oujiang Sag have been systematically studied. The results show that the Oujiang Sag experienced three faults, depression and regional subsidence Tectonic evolution stage, tectonic evolution controlled the development and distribution of sedimentary system, and developed three sets of source rocks, namely, Gui Feng Group, Ling Feng Group and Ming Yue Feng Group. The paleo-geotemperature field in the study area underwent the process of burial warming-up-cooling-burial warming, and the paleo-temperature experienced by the Xi Sag was higher than that of the Dong-Sag. This differential thermal evolution controlled the hydrocarbon generation of the source rocks in the study area. The maturity of the Xiushu source rocks in the Oujiang depression was significantly higher than that of the Dongsian depression. The Oujiang Depression developed abnormally high pressure and experienced the processes of pressure increase, pressure release and pressure increase. The abnormal high pressure provided the driving force for the migration of oil and gas. Tectonic evolution, heat flow and hydrocarbon generation and dynamic overpressure accumulation and release. All three control the hydrocarbon accumulation in the Oujiang Sag. However, the three should match with each other in time and should be coupled with each other to promote hydrocarbon accumulation.