断层垂向封闭性演化的定量研究  

Quantitative research for evolution of vertical seal of fault

作　　者：付广[1] 袁大伟[1] 

机构地区：[1]大庆石油学院,黑龙江大庆163318

出　　处：《断块油气田》2009年第1期1-5,共5页Fault-Block Oil & Gas Field

基　　金：国家973重大基础研究项目(2001CB209104)资助

摘　　要：在断裂垂向封闭机理及其演化过程分析的基础上,开展了断层垂向封闭性演化的定量研究。将断层垂向封闭性演化分为静止期和活动期2个阶段,利用断层面压力是否达到泥岩塑性变形极限,建立了静止期断裂垂向封闭性的定量评价方法;利用最大主压应力与断裂走向之间的夹角大小,建立了活动期断裂垂向开启程度的定量评价方法。以海拉尔盆地苏仁诺尔断裂为例,对其垂向封闭性演化史进行了定量研究,得到苏仁诺尔断裂西南部和东北部垂向封闭性演化明显存在差异,西南部活动开启时间和开启程度均长于和高于东北部,造成南一段源岩生成排出油气的散失量西南部应明显高于东北部,这可能是苏仁诺尔断裂东北部附近工业油气流井明显多于西南部的一个重要原因。Based on the analysis of vertical seal mechanism and evolution process of fault, the evolution of vertical seal of fault was studied quantitatively. Evolution of vertical seal of fault was divided into two stages of motionless period and motion period. By using the relation between the pressure on fault surface and the plastic deformation limit of mudstone, a quantitative method for evaluating vertical seal of fault in motionless period was set up. By using the angle between the orientation of maximum principal compressive stress and the strike direction of fault, a quantitative method for evaluating the vertical open degree of fault in motion period was set up. Taking Surennuoer Fault of Wuerxun Depression in Hailer Basin as an example, evolution history of its vertical seal was studied by the method. The results show that there is obviously difference between the evolution histories in the southwest and the northeast of the fault. The open time and degree in southwest of Surennuoer Fault are longer and stronger than that in northeast of Surennuoer Fault, causing the oil-gas losing amount of Klnl source rock in the southwest of Surennuoer Fault being more than that in the northeast of the fault. This may be an important cause that the industrial oil-gas wells in the southwest of Surennuoer Fault is more than that in the northeast of the fault.

关 键 词：断裂 垂向封闭性 演化 定量研究 静止期 活动期 

分 类 号：TE121.2[石油与天然气工程—油气勘探]