源外斜坡区有利于油气运聚的断砂配置分布区预测方法

为了研究含油气盆地源外斜坡区油气分布规律，在源外斜坡区断砂配置运聚机制及有利分布区研究的基础上，通过砂体连通分布区和砂体所在地层顶面砂体输导油气汇聚区，确定油气成藏期砂体输导油气分布区；通过断裂填充物泥质含量与断裂侧向封闭所需的最小填充物泥质含量的相对大小，确定油气成藏期河道砂体上倾方向断裂侧向封闭部位，二者叠合建立了一套源外斜坡区有利于油气运聚的断砂配置分布区预测方法，并将其应用于渤海湾盆地歧口凹陷有利于油气运聚的扣村断裂与沙一下亚段砂体配置分布区的预测中。结果表明：有利于油气运聚的扣村断裂与沙一下亚段砂体配置分布区主要分布在其东部，有利于西北歧南次凹沙三段源岩生成油气在扣村断裂附近沙一下亚段内聚集成藏，与目前扣村断裂附近沙一下亚段已发现油气主要分布在其东部相吻合，表明该方法用于预测源外斜坡区有利于油气运聚的断砂配置分布区是可行的。

Method for predicting the fault-sand configuration distribution area favorable for hydrocarbon migration and accumulation in the slope area outside the source

In order to study the distribution law of hydrocarbon in slope area outside source area of petroliferous basin, based on the study of fault-sand configuration mechanism of migration and accumulation and the favorable distribution area in outer slope area, troughing connected distri- bution area of sand body and hydrocarbon migration and accumulation of sand body conduction where the sand body is located, the distribution area of hydrocarbon transported by sand bodies during the hydrocarbon accumulation period is determined. According to the relative size of shale content of fracture filler and the minimum shale content of the filling required for lateral sealing of fault, the lateral sealing position of the fault in the up-dip direction of the channel sand body during the hydrocarbon accumulation period is determined. A set of prediction method of fault-sand configuration distribution area is established, which is conducive to hydro- carbon migration and accumulation in slope area outside source area. And the method is ap- plied to predict the fault-sand configuration distribution area of Koucun fault and the sand body of the lower submember of member 1 of Shahejie Formation in Qikou Sag of Bohai Bay Basin, which is conducive to hydrocarbon migration and accumulation. The results show that the fault-sand configuration distribution area of Koucun fault and the lower submember of member 1 of Shahejie formation, which are favorable for hydrocarbon migration and accumulation, are mainly distributed in the eastern part, and hydrocarbon generated at source rocks of member 3 of Shahejie Formation in southeast Qinan fault was accumulated in the lower submember of member 1 of Shahejie Formation around Koucun fault, which is consistent with the fact that hy- drocarbon are mainly distributed in the east of the the lower submember of member 1 of Shahe- jie Formation near the Koucun fault, indicating that this method is feasible to predict the fault-sand configuration distribution area in slope area outside Source area, which is conducive to hydrocarbon migration and accumulation.