地壳应力场和密度场资料在油气检测中的应用

Hydrocarbon detection with data of crustal stress and density fields

1. 中国地质大学环境科学系,北京100083;2. 国家卫星气象中心,北京100081;3. 北京大学计算中心,北京100871

1. Department of Environment Science, China University of Geosciences, Beijing 100083, China;2. National Satellitemeteorological Center, Beijing 100081, China;3. Computer Center, Peking University, Beijing 100871, China

依据卫星轨道摄动测量结果反演的地壳区域构造应力场和密度场资料,可圈定油气区域构造圈闭和储集油气的低密度层。计算绘制了闽江口扇形洲区域构造应力场和密度场卫星遥感图。图上显示出东海近海闽浙中拗陷含油气带与温东丽水油气构造带相接,敖江口官岭与闽江口川石诸岛沥青苗等迹象都在此范围内。在闽江口扇形洲东部沿海沙泥沉积区、邻区东海宽长带深厚海沙软泥沉积区及本区北部罗源湾,用大地电磁CSAMT检测到1000～3000m深度范围内的低阻率地层,与本区卫星遥感图低密度场相符。

The data of crustal stress and density fields calculated from perturbations of satellite orbits are used for delineation of structural traps of hydrocarbon accumulation and detection of low density hydrocarbon bearing formations. The satellite remote sensingmaps of stress and density fields on regional structures over the coastal fan-shaped delta ofminjiang River reveal that the hydrocarbon-bearing zone of offshore Fujan-Zhejiang depression joins with the hydrocarbon-bearing zone of Wenzhou-Lishui structural belt. The asphalt seepage occurred in Guanling of the entrance of Aojiang River and Chuanshi Islands of the entrance ofminjiang River lies in the a bovementioned zones. The CSAMT surveyed in the sedimentary province of sand clay in the east coastal area ofminjing River, the sedimentary province of soft clay of sea sand in the nearby wide and elongated zone, and Luoyuan Bay of the work area detects a low resistivity formation of 1000～3000m. This agrees with the low den-sity field of satellite remote sensing.