A Palaeohydrodynamic Analysis of Upper Palaeozoic Group in Middle Ordos Basin
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摘要: 应用盆地数值模拟技术，恢复了目的层在不同地质历史时期流体（气）动力分布。研究发现，鄂尔多斯盆地中部上古生界自油气生成之后的古流体动力可以划分为三个演化阶段，即三叠～侏罗纪、早白垩世与晚白垩世至今，这恰与同期的构造演化特征相吻合。此外还发现，流体动力的分布受沉积条件制约，且压实流对流体动力的贡献大于重力流。Abstract: The palaeo-hydrodyonamics during different geologic periods around middle giant gas field in O rdos Basin are restored use of Basin modeling and other technique.Acco rding to the distrbution of fluid (gas) potential, i t is discovered that the palaeo-hy rodynamic evolution history of U pper Palaeozoic Group since Triassic period (in which source rocks were matured)could be dividedinto three major stages, i.e.Triassic-Jurassic period, ear- ly C rtaceous epoch and late Creataceous epoch up to now.On the basis of sy nthetic analysis, the follow three characteristics have also been discovered: ( 1) the fo rmer three majo r stages of hydrodynamic evduition are closely to realated regional tectonic evoultion stage; (2) the distribution of fluid pressure is controlled by ralat- ed sedimentation (rate, thickness); (3) althoug h the objective layers is old (late Paleoaoic ear), the contribu- tion of compactional flow in hy drody namics is still evidently more than of g ravi tational flow, even in now a- days.
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Key words:
- palaeo-hydrodynamics /
- fluid potential /
- fluid pressure /
- upper Palaeozoic group /
- O rdos Basin
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