油气沿断裂垂向与砂体侧向运移转换条件分析——以渤海湾盆地局部构造为例
发布时间：2018-07-25 10:48
【摘要】：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.
[Abstract]:In order to study the distribution of oil and gas in Cenozoic faulted basins, on the basis of studying the conditions of vertical migration and lateral migration of oil and gas along the fault, the relative magnitude of displacement pressure of fault fillers and sand bodies on both sides is compared. The fracture thickness of mudstone caprock is relative to the minimum fracture thickness of its sealed oil and gas. In this paper, a set of discriminant methods for the vertical migration of oil and gas along the fault to the lateral migration of the sand body is presented. If the displacement pressure of the fault filler is greater than that of the two sides of the sand body, the oil and gas migrates vertically along the fault to the side of the sand body. If the thickness of the mudstone caprock is less than the minimum fault thickness of the seal oil and gas, the oil and gas migration along the side of the sand body to the vertical migration along the fault can not be converted. The method is applied to the discrimination of oil and gas migration and transformation of No.1 and No.2 structures in Nanbao Sag, Bohai Bay Basin, and Sha 1 member of Wenan Slope in Jizhong Depression, respectively. The results show that the oil and gas of Nanpu 1 and Nanbao 2 structures are migrated vertically along the fault to the 34 sand beds of Dongying formation laterally, and no lateral migration transition occurs in 9 sand beds. The oil and gas of Shayi formation in east and west of Wenan slope are migrated along the side of the sand body to the vertical direction of the fault, but there is no vertical migration transformation along the fault in the rest of the area. These results are in agreement with the oil and gas distribution found in the first member and Dongying formation of Wenan Slope in Dongying formation of No.1 and No.2 structures, respectively, indicating the rationality of this method in distinguishing vertical migration along the fault and lateral migration along the sand body.
【作者单位】： 东北石油大学地球科学学院;
【基金】：国家自然科学基金项目(41372154)
【分类号】：P618.13
本文编号：2143592
[Abstract]:In order to study the distribution of oil and gas in Cenozoic faulted basins, on the basis of studying the conditions of vertical migration and lateral migration of oil and gas along the fault, the relative magnitude of displacement pressure of fault fillers and sand bodies on both sides is compared. The fracture thickness of mudstone caprock is relative to the minimum fracture thickness of its sealed oil and gas. In this paper, a set of discriminant methods for the vertical migration of oil and gas along the fault to the lateral migration of the sand body is presented. If the displacement pressure of the fault filler is greater than that of the two sides of the sand body, the oil and gas migrates vertically along the fault to the side of the sand body. If the thickness of the mudstone caprock is less than the minimum fault thickness of the seal oil and gas, the oil and gas migration along the side of the sand body to the vertical migration along the fault can not be converted. The method is applied to the discrimination of oil and gas migration and transformation of No.1 and No.2 structures in Nanbao Sag, Bohai Bay Basin, and Sha 1 member of Wenan Slope in Jizhong Depression, respectively. The results show that the oil and gas of Nanpu 1 and Nanbao 2 structures are migrated vertically along the fault to the 34 sand beds of Dongying formation laterally, and no lateral migration transition occurs in 9 sand beds. The oil and gas of Shayi formation in east and west of Wenan slope are migrated along the side of the sand body to the vertical direction of the fault, but there is no vertical migration transformation along the fault in the rest of the area. These results are in agreement with the oil and gas distribution found in the first member and Dongying formation of Wenan Slope in Dongying formation of No.1 and No.2 structures, respectively, indicating the rationality of this method in distinguishing vertical migration along the fault and lateral migration along the sand body.
【作者单位】： 东北石油大学地球科学学院;
【基金】：国家自然科学基金项目(41372154)
【分类号】：P618.13
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