被断裂破坏后盖层封闭能力的评价方法  

EVALUATION METHOD OF CAP ROCK SEALING CAPACITY AFTER FAULT DESTRUCTION

作　　者：张立国[1] 付广[2] 赵颖颖[3] 

机构地区：[1]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [2]大庆石油学院地球科学学院,黑龙江大庆163318 [3]大庆油田有限责任公司第三采油厂,黑龙江大庆163113

出　　处：《大庆石油地质与开发》2009年第4期15-18,共4页Petroleum Geology & Oilfield Development in Daqing

基　　金：基金项目：国家重点基础研究项目（2001CB209104）资助.

摘　　要：根据断裂对盖层破坏程度与盖层原始封闭能力的关系，在利用盖层被断裂破坏后与破坏前所受压力的比值求取断裂对盖层封闭能力的破坏程度基础上，建立了一套被断裂破坏后盖层封闭能力评价方法。将该方法应用于海拉尔盆地乌尔逊凹陷被断裂破坏的大一段泥岩盖层封闭能力评价的结果表明，大一段泥岩盖层Wu80断裂北部、Wu39号断裂西南部、Wu16号断裂南部和巴彦塔拉断裂中北部无封闭能力，其余均具有好的封闭能力。大一段泥岩盖层较强的封闭能力有利于南二段油气聚集与保存，这是乌尔逊凹陷南二段油气相对富集的重要原因。实践证明了该方法在定量评价被断裂破坏后的盖层封闭能力的可行性。Based on the relationship between fault destructiveness to cap rock and cap rock original sealing capacity, destructiveness of fault sealing capacity to cap rock is achieved based on pressure ratio of cap rock after and before fault destruction, and a set of cap rock sealing capacity evaluation method after fault destruction is established. The method is applied in Da Ⅰ Member shale cap rock broken by fault in Wuerxun Sag of Hailaer Basin. Results show that, north of No. Wu80 Fault, southwest of No. Wu39 Fault, south of No. Wu16 fault and middle-north part of Bayantala Fault have no sealing capacity, and other faults all have high sealing capacity. High sealing capacity of Da I Member shale cap rock is favorable for hydrocarbon accumulation and storage in Nan Ⅱ Member, which is a significant reason for hydrocarbon enrichment in Nan Ⅱ Member of Wuerxun Sag. Practice indicates that this method is feasible for quantitatively evaluating cap rock sealing capacity after fault destruction.

关 键 词：断裂破坏 盖层 封闭能力 原始沉积 乌尔逊凹陷 大一段盖层 

分 类 号：TE121[石油与天然气工程—油气勘探]