台北凹陷中浅储集层碎屑岩孔隙预测

The Pore Forecast for Clastic Rock of Middle and Shallow Reservoir in Taibei Sag

在系统研究储层物性控制因素的基础上,对台北凹陷中浅储集层物性分布规律以及压实程度特征进行系统分析,建立了孔隙度—深度趋势法和压实减孔量法等两种方法预测储集层碎屑岩孔隙度。认为中侏罗统砂岩压实减孔量整体比较高,平面上表现出"北高南低,生油凹陷内高、周边低"的特征,北部山前带则受构造挤压的影响。同时指出台北凹陷中浅储集层埋深大于4000m时,除葡北、葡萄沟和七泉湖地区外,勘探风险较大。

Based on the systematical study for the dominated factors of reservoir physical properties, physical property distribution and compaction degree of middle and shallow reservoir in Taibei sag is analyzed systematically. Two methods for forecasting clastic rock porosity of reservoir, porosity-depth trend method and compaction porosity-reduction method, have been built. It is thought that compaction porosity-reduction of sandstone in middle Jurassic reservoir is totally high, with the characteristics of 'high in north and low in south, high in the interior of source sag and low in the exterior of source sag'. The northern front belt of mountain is impacted by tectonic movement. It is pointed out that the risks for surveying the area, except Pubei and Pu Taogou and Qi Quanhu, are very huge when the buried depth of middle and shallow reservoir is over four kilometers.