潜江凹陷烃源区的油气运移路径预测模型

Forecasting Model of Oil Migration Path in Source Area of Qianjiang Depression

潜江盐湖盆地生油洼陷以巨厚暗色泥岩沉积为特征,间夹的渗透性砂岩构成了主要流体输导体系,油气初次运移以面状补给方式就近进入相邻输导层。油气运移路径的预测模型以栅格数据模型表达的流体势场为基础,应用运移方向矩阵计算、运移累积量矩阵计算、运移汇聚网络提取等技术模拟油气运移趋势网络的空间分布;通过输导体系评价数据与运移趋向网络分布数据的空间叠加分析处理,可预测油气运移路径的空间分布。蚌湖周缘油气运移路径模拟实验表明该模型可准确反映生油洼陷的油气运移规律。

The depositional features of source depression in the salt-lake basin of Qianjiang Area were a dark-colored shale rock with huge thickness,and main fluid transportation system was constructed by permeable interbeddings.The direction of primary oil migration was adjacent the transport layer and catchment of petroleum was surface-recharged.Based on raster data model of fluid potential,the prediction model of oil migration path can be used to simulate network distribution of migration trends by using the technologies such as calculation of migration direction matrix,calculation of migration cumulant matrix,network extraction of migration and simulation.Through spatial superposed analysis between evaluated data of transportation system and distribution of migration trends network,the distribution of oil and gas migration path can be forecasted.The simulation test of petroleum migration path around BANGHU syncline indicates that this model can reflect accurately the rules of oil and gas migration in source sag.