油气穿过断盖配置散失部位的预测方法

Loss Prediction of Hydrocarbon across Fault-Caprock Configuration

为了研究含油气盆地下生上储式生储盖组合中油气分布规律,在油气穿过断盖配置渗滤散失条件及断裂输导油气特征研究的基础上,通过确定油气穿过断盖配置渗滤散失区和输导断裂凸面脊,将二者叠合建立了一套油气穿过断盖配置渗滤散失主要部位的预测方法。研究结果表明:留楚地区下伏沙一段烃源岩生成的油气穿过东二段、东三段断盖配置渗滤散失主要部位主要分布在留楚地区南部和少量分布在留楚地区北部留楚背斜核部的局部地区,有利于下伏沙一段烃源岩生成的油气在过东二段、东三段断盖配置之上的馆陶组中运聚成藏,与目前留楚地区馆陶组已发现油气主要分布在北部留楚背斜核部相吻合,表明该方法用于预测油气穿过断盖配置渗滤散失主要部位是可行的。该预测方法对冀中坳陷饶阳凹陷留楚地区油气勘探具有指导意义。

The Loss of hydrocarbon across fault-caprock configuration and the fault-transmission hydrocarbon are analyzed to study the hydrocarbon distribution patterns in the source-reservoir-caprock association with on-source accumulation in the petroliferous basin. The hydrocarbon infiltration loss zone and the convex ridge of transmission fault are identified and superimposed to establish a set of methods for predicting the major part of hydrocarbon loss across fault-eaproek configuration. Research indicates that the hydrocarbon generated from the lower Shal Member source-rock migrate across the fault-eaproek configurations of the Dong2 and Dong3 Members. The major hydrocarbon loss parts distribute in the southern part of Liuchu and a part distributes in the local area of Liuchu anticline in the northern part. This hydrocarbon is favorable to the hydrocarbon accumulation in the Guantao Formation after generating from Shal Member source-rock and migrating across the fault-caprock configurations in the Dong2 and Dong3 Members. The discovered hydrocarbon in the Guantao Formation of Liuchu mainly distribute in the core of northern Liuchu anticline , which is mainly consistent with the core of the northern Liuchu anticline. It is shown that this method is feasible for predicting the loss hydrocarbon part across the fault-eaprock configuration. This research could provide certain guidance for the hydrocarbon exploration in Liuehu of Raoyang Sag and Central Hebei Depres- sion.