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  

Conversion condition analysis for vertical migration along faults and lateral migration along sand bodies of oil and gas:Taking the local structure of Bohai Bay basin as an example

作　　者：付广[1] 展铭望[1] 

机构地区：[1]东北石油大学地球科学学院,黑龙江大庆163318

出　　处：《中国矿业大学学报》2017年第2期336-344,共9页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(41372154)

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.To study the oil and gas distribution of Cenozoic faulted basin,by comparing the displacement pressure of fault filler and both sides of the sand body,as well as the breaking thickness of mudstone cap rock and the minimum fault thickness of oil and gas,a set of discriminant method for the conversion of vertical migration along faults and lateral migration along sand bodies of oil and gas was established.If the displacement pressure of fault filling material is greater than the pressure on both sides of the sand body,vertical migration of oil and gas along faults transforms to lateral migration along sand bodies,otherwise it cannot be transformed.If the thickness of mudstone caprock is less than the minimum breaking thickness,lateral migration of oil and gas along sand bodies transforms to vertical migration,otherwise it cannot be transformed.The discriminant method was applied to Nanpu No.1and No.2structure in Bohai Bay basin and in Es1 of Wen＇an slope in the middle of Hebei depression to discriminatewhether the oil and gas vertical and lateral migration would switch.The results show that oil and gas in Nanpu No.1and No.2structure have experienced a conversion from vertical migration along faults to lateral migration along 34 sand bodies of Dongying formation.9sand bodies didn＇t have a conversion from vertical migration along faults to lateral migration.Lateral migration of oil and gas in Es1 conversed to vertical migration along faults of Wen＇an slope in the eastern and middle part of western area,but did not happen in the rest parts.The discriminant result coincides with the oil and gas distribution found in Dongying formation of Nanpu No.1and No.2structure,Es1 and Dongying formation of Wen＇an slope,which indicates that the method is feasible.

关 键 词：油气 断裂垂向运移 砂体侧向运移 转换条件 判别方法 

分 类 号：TE122.14[石油与天然气工程—油气勘探]