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为了研究新生代断陷盆地中油气分布规律,在油气沿断裂垂向运移与沿砂体侧向运移转换条件研究的基础上,通过比较断裂填充物排替压力与两侧砂体排替压力相对大小、泥岩盖层断接厚度与其封存油气的最小断接厚度相对大小,提出了一套油气沿断裂垂向运移向沿砂体侧向运移转换的判别方法:如果断裂填充物排替压力大于两侧砂体排替压力,油气沿断裂垂向运移向沿砂体侧向运移转换,反之则不能转换;如果泥岩盖层厚度小于其封存油气的最小断接厚度,油气沿砂体侧向运移向沿断裂垂向运移转换,反之则不能转换.将此方法分别应用于渤海湾盆地南堡凹陷南堡1号和2号构造和冀中坳陷文安斜坡沙一段油气运移转换的判别中,结果表明:南堡1号和南堡2号构造油气沿断裂垂向运移向沿东营组34个砂层侧向运移转换,有9个砂层未发生侧向运移转换;文安斜坡在东部和西部的中部地区沙一段油气沿砂体侧向运移向沿断裂垂向运移转换,而其余地区未发生沿断裂垂向运移转换.这些判别结果分别与目前南堡1号和2号构造东营组、文安斜坡沙一段和东营组已发现油气分布相吻合,表明该方法用于判别沿断裂垂向运移与沿砂体侧向运移转换的合理性.
In order to study the distribution rule of oil and gas in the Cenozoic fault basin, on the basis of the research on the migration conditions of oil and gas along the vertical fault and the lateral migration along the sand body, The relative size of pressure, relative thickness of mudstone caprock and relative minimum thickness of seal oil and gas were compared. A set of discriminating method of hydrocarbon migration from the vertical to the lateral along the sand body was put forward. For the pressure greater than the displacement of sand bodies on both sides of the pressure, vertical migration of oil and gas along the lateral migration along the sand body, and vice versa can not be converted; if the mudstone cap thickness is less than the minimum sealing thickness of the oil and gas reservoirs, oil and gas along Lateral migration of sand body transits vertically along the fault, otherwise it can not be converted.This method is applied to the structures of Nanpu No. 1 and No. 2 in Nanpu Sag, Bohai Bay Basin, and the first member of sandstone of Wen’an Slope in Jizhong Depression The results show that the migra- tion of oil and gas along the fault in Nanpu No. 1 and No. 2 on the south bank transforms laterally along the 34 sand layers of the Dongying Formation, and 9 sand layers did not occur in the lateral direction Transport conversion; Wen’an slope in the east and In the central part of the central part, the oil and gas of the first member of Shahejie Formation migrated along the sand body laterally along the sand body and migrated vertically along the fault, while the rest of the region did not change along the vertical migration of the fault.These results are respectively consistent with the current structure of No. 1 and No. 2 Nanpu The distributions of oil and gas in Dongying Formation, Wenyi Slope and the Dongying Formation have been found to be consistent with each other, indicating that this method can be used to judge the rationality of the vertical migration along the fault and the lateral migration along the sand body.