酒西盆地鸭儿峡油田志留系变质岩油藏的裂缝特征  

The Fracture Characteristics of Metamorphic Rock Oil Reservoir in Silurian System of Yaerxia Oilfield,Jiuxi Basin

作　　者：景士宏[1] 李炼文[1] 敬晓锋 高辉[2] 

机构地区：[1]玉门油田分公司鸭儿峡油田作业区,甘肃酒泉735200 [2]西安石油大学石油工程学院,西安710065

出　　处：《河南科学》2015年第10期1832-1837,共6页Henan Science

基　　金：国家自然科学基金(41102081);教育部重点项目(212172);陕西省自然科学基础研究计划(2012JQ5003);国家科技重大专项(2011ZX05013-005)

摘　　要：为明确潜山变质岩的裂缝发育特征,以酒西盆地鸭儿峡油田志留系潜山变质岩油藏为例,综合利用成像测井、岩心观察、大量的薄片统计和核磁共振手段对裂缝方向、充填程度、裂缝参数和核磁共振响应特征进行研究系统研究.结果表明,研究区裂缝方向主要为北西方向和北东,裂缝类型以斜交缝为主,其次为垂直缝,水平缝发育程度差,裂缝充填严重.斜交缝的分布频率平均为1.01条/m,垂直缝为0.19条/m;水平缝为0.26条/m.裂缝宽度平均为0.775 mm,裂缝长度平均为6.56 cm.垂直缝的裂缝宽度最大,斜交缝中开口缝比例最高.具有储集性能的裂缝性变质岩在核磁共振T2谱主要为双峰和三峰态,有利目标区寻找应该以北东向裂缝发育区为重点.In order to make fracture characteristics of metamorphic rock clear, taking the metamorphic rock oil reservoir in Silurian system of Yaerxia oilfield, Jiuxi basin as an example, we studied the fracture orientation, filling degree, fracture parameters and nuclear magnetic resonance response characteristics, using imaging logging, core observation, a lot of statistics, and nuclear magnetic resonance （NMR） methods. The results show that, main fracture directions are the northwest and northeast, fracture type is given priority to with oblique fractures, followed by a vertical fractures, development degree of horizontal fractures is poor, filling degree of fractures are serious. Oblique fractures distribution frequency averaged 1.01 strip/m, vertical fractures is 0.19 strip/m, horizontal fractures is 0.26 strip/m. The average width of fracture is 0.775 mm, and the average length fracture is 6.56 cm. The width of vertical fracture is biggest, while the open fracture percentage in oblique fractures is highest. The T2 spectrum of metamorphic rocks having reservoir capacity mainly presents two peaks and three peaks. Favorable target area should he looked for the north east fracture development zone.

关 键 词：裂缝方向 裂缝参数 核磁共振响应 变质岩 鸭儿峡油田 

分 类 号：TE122.2[石油与天然气工程—油气勘探]