青藏高原羌塘盆地重磁剖面异常与基底构造特征

以穿越羌塘盆地的实测重磁剖面数据为基础,密切结合平面重磁异常资料,通过对重磁异常特征进行分析,采用位场转换和正反演拟合计算方法,推断了羌塘盆地的基底埋深、断裂构造及盆地样式,并对盆地的油气远景进行了探讨。认为南羌塘基底埋深浅,呈台阶状,且构造复杂,北羌塘埋深深,其间的龙木错-双湖构造带有明显的重磁异常显示。

Gravity and magnetic anomaly profiles and characteristics of basement structure in the Qiangtang basin, Qinghai-Tibet Plateau.

Based on the data from the gravity and magnetic profiles across the Qiangtang basin,combined with the data of plan gravity and magnetic anomalies,through an analysis of the features of the gravity and magnetic anomalies and by using the method of potential-field transformations and forward-inverse fitting,the authors deduce the burial depth of the base- ment,fault structure and style of the Qiangtang basin and discuss the petroleum prospects of the basin.They think that the basement of southern Qiangtang has a shallow burial depth and occurs as steps with complex structure,while the basement of northern Qiangtang is deeply buried.The Lungmu Co-Shuanghu Lake structural belt between the northern and southern Qiangtang have conspicuous gravity and magnetic indications.