断层垂向封闭演化史及其研究意义  

Evolution history of vertical seal of faults and its research significance

作　　者：张喜[1] 王贵文[2] 

机构地区：[1]中国石油天然气股份有限公司吐哈油田分公司,新疆哈密838202 [2]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《大庆石油地质与开发》2007年第4期51-54,共4页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家"973"重大基础研究项目(2001CB209104)资助成果

摘　　要：在断裂垂向封闭机理及评价标准研究的基础上,通过断裂垂向封闭性演化规律及影响因素分析,建立了一套断裂垂向封闭性演化史研究方法。以海拉尔盆地乌尔逊凹陷苏仁诺尔断裂为例,对其在大一段盖层内垂向封闭史进行了研究,得到苏仁诺尔断裂西南部在大一段盖层内垂向封闭于伊敏组沉积末期形成,之后垂向封闭性逐渐增强至今。东北部在大一段盖层内垂向封闭于大二段沉积末期形成,但在伊敏组沉积时期因断裂活动开启,伊敏组沉积末期又开始形成垂向封闭,逐渐增强至今。苏仁诺尔断裂在大一段盖层内垂向封闭性形成时期略晚于南一段源岩大量排烃期,仍可封闭住南一段源岩生成排出的大量油气,有利于油气聚集与保存。这可能是造成该区油气主要沿苏仁诺尔断裂附近分布的一个非常重要的原因。Based on the study about vertical seal mechanism and evaluation standard of faults, and according to the analysis of evolution law of vertical seal of faults and the influence factors, a method studying evolution history of vertical seal of faults has been established. The pressure on fault surface equaling to or not to mudstone＇ s plastic deformed limit, is using to determine the formation period of vertical seal of faults. Based on the active history of faults, the evolution history of vertical seal of faults can be studied. Using Surennuoer fault in Wuerxun Depression of Hailaer Basin as an example, the evolution history of vertical seal in the Surennuoer fault in K1 d1 caprock has been studied. It is indicated that the vertical seal in the southwest of Surennuoer fault is formed at the end of K1y, after the end of Kly, the vertical seal in the southeast of Surenruoer fault increased gradually up to now. The vertical seal in the northeast of Surennuoer fault is formed at the end of K1d2, but in K1y the vertical seal in the northeast of Surennouer fault began due to fracturing. At the end of K1 y, the vertical seal in the northeast of Surennuoer fault began to grow again, and it increase gradually up to now. The formation period of vertical seal of Surennuoer fault in K1 d caprock is slightly latter than the period of a great deal hydrocarbon expulsion from K1 n1 source rock, and it can seal a great deal hydrocarbon expelled from K1n1 source rock. It＇ s favorable for hydrocarbon accumulation and storage. This may be an important cause that hydrocarbon in this area mainly distributes along Surennuoer fault.

关 键 词：断裂 垂向封闭性 演化史 苏仁诺尔断裂 

分 类 号：TE121[石油与天然气工程—油气勘探]