鄂尔多斯盆地中部上古生界古流体动力分析

A Palaeohydrodynamic Analysis of Upper Palaeozoic Group in Middle Ordos Basin

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。

The palaeo hydrodyonamics during different geologic periods around middle giant gas field in Ordos Basin are restored use of Basin modeling and other technique. According to the distrbution of fluid (gas) potential,it is discovered that the palaeo hyrodynamic evolution history of Upper Palaeozoic Group since Triassic period(in which source rocks were matured)could be dividedinto three major stages,i.e.Triassic Jurassic period,early Crtaceous epoch and late Creataceous epoch up to now.On the basis of synthetic analysis,the follow three characteristics have also been discovered:(1) the former three major stages of hydrodynamic evduition are closely to realated regional tectonic evoultion stage;(2) the distribution of fluid pressure is controlled by ralated sedimentation (rate,thickness);(3) although the objective layers is old (late Paleoaoic ear),the contribution of compactional flow in hydrodynamics is still evidently more than of gravitational flow,even in nowadays.