摘要
为分析乌尔逊凹陷大一段泥岩区域性盖层的封盖保存条件,利用盖层厚度与断距相对大小和断裂垂向封闭性,分别建立断裂对盖层有效厚度和封闭质量破坏程度的定量评价方法.通过乌尔逊凹陷8条主要断裂对大一段泥岩盖层有效厚度和封闭质量破坏程度的定量评价表明,乌尔逊凹陷大一段泥岩盖层在乌80断裂北部、乌39断裂西南部、乌16号断裂南部和巴彦塔拉断裂中北部有效厚度完全破坏,形成"天窗",不利于油气聚集与保存.其余断裂对大一段泥岩盖层有效厚度可形成由小至大的破坏,但对其封闭质量的破坏程度小.通过乌尔逊凹陷大一段泥岩盖层封盖保存条件与南二段工业油气流井分布之间关系分析表明,工业油流井均分布在大一段泥岩盖层被断裂破坏程度相对较小的地区,说明大一段泥岩盖层封盖保存条件是乌尔逊凹陷南二段油气聚集成藏的重要条件.
To study sealing preservation conditions of k1d1 mudstone regional caprock in Wuerxun depression,using the relative big or small between thickness of caprock and fault distance and vertical seal of faults,a quantitative method for evaluating destructive degree of faults to net pay thickness and seal quality of caprock were established.By the quantitative evaluation of 8 faults to net pay thickness and seal quality of k1d1 mudstone caprock,the destruction of the north of Wu80 fault,the southwest of Wu39fault,the south of Wu16 fault and the middle and north of Bayantala fault to net pay thickness of k1d1 mudstone caprock was fully destroyed and formed 'skylight',it is not favorable for oil-gas accumulation and preservation.The destruction of other faults to net pay thickness of k1d1 mudstone caprock was formed from small to big,but destruction degree of other faults to seal quality of k1d1 mudstone caprock was small.By the study of relation between sealing preservation conditions of k1d1 mudstone caprock and distribution of industrial oil-gas wells of k1n2 in Wuerxun depression,industrial oil-gas wells were considered to distribute in the area in that destroyed degree of k1d1 mudstone caprock is lower,sealing preservation condition of k1d1 mudstone caprock is the important condition for oil-gas to accumulate and form oil-gas reservoirs.
出处
《大庆石油学院学报》
CAS
北大核心
2009年第2期36-39,共4页
Journal of Daqing Petroleum Institute
关键词
乌尔逊凹陷大一段
泥岩盖层
有效厚度
封闭质量
断裂
破坏程度
Wuerxun depression
k1d1
mudstone caprock
net pay thickness
seal quality
fault
destruction degree
