台北凹陷中浅储集层孔隙预测及勘探有效下限探讨

THE POROSITY FORECAST AND EFFECTIVE LOWER LIMIT OF MIDDLE-SHALLOW RESERVOIR IN TAIBEI DEPRESSION

在系统研究储层物性控制因素的基础上,分析台北凹陷中浅储集层物性分布规律以及压实程度特征,建立孔隙度-深度趋势法和压实减孔量法预测砂岩孔隙度.认为中侏罗统储层压实减孔量整体比较高,表现出“北高南低,生油凹陷内高、周边低”的特征.结合探井试油资料,确定侏罗系储集层有效下限的孔隙度值为9%,压实减孔量为34%,各构造带侏罗系储层深度有效下限总体上表现出“南深北浅、西深东浅”的特征.指出台北凹陷侏罗系储集层在有效下限以下勘探具有较大风险.

On the basis of system researched reservoir nature factor. analysed middle-shallow reservoir nature's distribute disciplinarian and compress character in Taibei sag.Set up porosity-deepness means and compress-reduce hole means,forecasted porosity in sandstone. It thought that had the higher compress-reduce hole in middle-Jurssic reservoir, showed that north is high and south is lower,within is high and boder is lower.It confirmed that the effective lower limit of Jurassic reservoir is nine percent and compress-reduce hole is thirty-four percent, combined with the data of test well. Analysed that the effective lower limit of Jurassic reservoir in structural belts, as a whole, showed that south is deep and north is shallow, west is deep and east is shallow. Pointed that explore would have the bigger risk under the effective lower limit of Jurassic reservoir.