塔里木盆地西北部地壳三维构造研究  

THREE DIMENSION CRUSTAL STRUCTURE AT THE NORTHWEST CORNER OF TARIM BASIN

作　　者：赖晓玲[1] 李津[2] 孙译[3] 

机构地区：[1]中国地震局地球物理勘探中心,河南郑州450002 [2]西安石油大学资源工程系 [3]华北水利水电学院水利工程系

出　　处：《西南石油大学学报（自然科学版）》2007年第3期4-6,共3页Journal of Southwest Petroleum University(Science & Technology Edition)

基　　金：国家自然科学基金(40674043;40374032);地震科学联合基金(104027);中国地震局地球物理勘探中心论著RCEG200606。

摘　　要：利用Q值成像和震源分布图像方法,得到了伽师地区中、上地壳的三维Q值结构和发震时间的平面图像。结果表明水平截面不同深度的Q值图像都存在低Q值带,主要展布方向为东西向、北北东向和北北西向,与研究区的柯坪断裂、羊达曼断裂和麦盖提断裂有一定的对应关系,推测低Q值带可能是研究区的几条深部断裂;垂直剖面沿77°E的条带有大面积的低Q值区,并且在这个带的两侧Q值结构有明显差异。发震时间的平面图像显示出优势取向为北北西和北东,并且相交于余震分布的密集处,这些特征是该区域的活动构造背景。为区域地质构造研究和油气资源的探测提供了深部构造信息。Using Q-value tomography and hypocenter distribution image, the 3D Q-value structure and the seism starting time image are obtained in mid-upper crust in Jiashi seismic area. The results show on the horizontal sections at the different depth, every Q value image exists low Q value zones, main orentation is EW-striking, NNE-striking and NNW-striking, which are respectively corresponding with Keping fault, Yangdaman fault and Maigaiti fault in the study region. It is supposed that the low Q value zones are probably deep faults in study area. On the other hand, on the vertical profiles, large area of low Q value zones exist along belt of 77°E and Q value structure of two sides of this belt are obviously different. Seism starting time plane image displays that dominate orientation is NNW and NE, which intersects with the after-shock concentration area. These features are the active structural setting of this area. And it provides deep tectonic information for the geologic structure research and the petroleum resources exploration.

关 键 词：三维 Q值成像 地壳深部 断裂 新疆伽师 

分 类 号：TE111.2[石油与天然气工程—油气勘探]