沉积盆地内多套水动力系统的并存及对地层压力评价的影响

he analysis on hydrodynamic conditions is being an important contents in petroleum geology research. There is a basic premise in usual style of expressing formation pressure that the hydro-carrier beds are connected mutually, and there are inconsistant basicly between topography relief and surface of water potential. However, how to measure the aplitude of pressure in a area or a statium, in which more hydrodynamic systems are co-exsited in a basin and seperated mutually, is still a weak link. In this paper, the origin of abnormal low pressure from Yuncan 1 well is probed on the basis of distribution of measured formation pressure in drills from Chuxiong basin. It is conclude that there are more pressure systems according to analysis on hydrogeological conditions. The formation pressure is re-evaluted indicating the result of hydrostatic pressure, after deducting the influnce of non-pressred strata. The researhed resluts in this paper would provide a new thought for the evalution of formation pressure in western China basins, in which developing many boulder-stream gullies in topography, and co-existing many underground hydrodynamic systems.