新疆石油地质

新疆石油地质 ›› 2003, Vol. 24 ›› Issue (2): 107-109+184.

• 油气勘探 • 上一篇    下一篇

羌塘盆地重力均衡及其地质意义

王宜昌1, 杨辉2, 郭祖军3   

  1. 1.石油物探局,河北涿州 072700;
    2.石油大学CNPC物探重点实验室,北京 100083;
    3.中国石油 石油勘探开发科学研究院,北京 100083
  • 收稿日期:2002-05-27 修回日期:2002-09-05 出版日期:2003-04-01 发布日期:2020-09-17
  • 作者简介:王宜昌（1938-）,男,浙江杭州人,高级工程师,地球物理勘探。联系电话：0312-81201234-23676

Gravity Equilibrium and Its Geological Significance in Qiangtang Basin

WANG Yi-chang, YANG Hui, GUO Zu-jun   

  • Received:2002-05-27 Revised:2002-09-05 Online:2003-04-01 Published:2020-09-17
  • About author:WANG Yi-chang (1938-), Male, Senior Engineer, Geophysical Prospecting, Petroleum Exploration Bureau, Zhuozhou, Hebei 072700, China

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摘要： 羌塘盆地重力场最本质的特征是与地形具有不同级次的相关关系。其中二级相关最为重要,由于得到壳内低阻层的映证,因而说明壳内低阻层就是壳内均衡调节面。上隆的地形高地和下陷的低阻层区块对应,二者构成山根均衡柱体;反之,下坳的地形低地和上隆的低阻层对应,构成反山根均衡柱体。均衡柱体在平面上呈多边形状,面积约在万平方千米左右,在北羌塘地区山根柱体呈“入”型排列;反山根柱体东、西相间排列。其石油地质意义在于：南、北羌塘应是不同性质的盆地;大型重力低不是沉积深坳陷,而是被改造的均衡隆升构造带;因低阻层上隆将盆地改造成相对冷壳、热壳、冷盆和热盆,对油气热演化有较大影响。

关键词: 羌塘盆地, 重力场, 地形, 构造, 隆起, 坳陷

Abstract: Gravity field in Qiangtang basin is of correlation in different levels with landform, which is the most principal feature. Among them the Level-Ⅱ is the most important correlation. Study shows that crustal low resistivity zone should be the crustal isostatic adjustment surface; upward highland is corresponding to downwarped low resistivity zone block, both shape isostatic cylindrical body (ICB) of mountain massif. In contrast, downparped lowland is corresponding to upward low resistivity zone, constituting reverse ICB of mountain massif. Hence, ICB appears to be multi-side shapes with an area of about 1x104km2. In north Qiangtang area, the ICB occurs in array of inverse “V” form; while the reverse ICB arranges in E-W orientation. They imply the petroleum geologic significance that south and north Qiangtang should be basins of different features; the large gravity lows are not deep depression deposits but reconstructed isostatic upward and rising structural zones; the low resistivity zone uplifting might change the basin into relatively cold or hot crust and cold or hot basin, thus having more impor-tant efcts on its thermal evolution of hydrocarbons.

Key words: Qiangtang basin, gravity field, landform, structure, uplift, depression

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