论文部分内容阅读
作为日本地热资源的综合的、全国性评价的一部分,做出了覆盖九州岛的第一份居里点深度图。该图是根据反演区域航空磁测网格数据做出的,这里提出了根据点偶极子分布反演网格数据的两种令人满意的算法。第一种算法通过计算傅里叶变换径向频谱的最小二乘拟合,估算这种分布的质心坐标x_0、y_0和z_0,第二种算法通过计算频谱振幅平方的最小二乘拟合,只估算质心深度,至于点偶极子集合的顶部平均深度z_t,由第二种算法的改变来估算,作为居里点深度的偶极子底部度深为zb=2z_0-z_t。由深度估计量用手画等值线得到最后的图,用居里点深度图与区域地质和热流数据,以及有限的重力数据作比较,居里点深度和热流以及区域地质之间有很好的相关,在重力和居里点深度之间观察到的空间相关被认为是次级的构造效应。目前正在运转着的地热发电站的位置与最浅的居里点深度相对应,根据这些比较,我们得出结论,这些方法提供了地质上合理的结果,而在全国性的地热评价计划中是合用的。
As part of a comprehensive, national assessment of geothermal resources in Japan, the first Curie point depth map covering Kyushu Island was made. The figure is based on the aeromagnetic mesoscale grid data from the inversion region and two satisfactory algorithms for retrieving grid data from point dipole distributions are presented here. The first algorithm estimates the centroid coordinates x_0, y_0 and z_0 of this distribution by computing the least squares fit of the radial spectrum of the Fourier transform. The second algorithm, by computing the least-squares fit of the spectral amplitude squared, The depth of center of mass is estimated. As for the top average depth z_t of the set of point dipoles, which is estimated from the change of the second algorithm, the dipole bottom depth as the Curie point depth is zb = 2z_0-z_t. The final map is drawn from the depth estimate by hand contouring and compared with the Curie point depth map and regional geology and heat flow data, as well as limited gravity data, and the Curie point depth is very good between heat flow and regional geology The observed spatial correlation between gravity and Curie point depth is considered as a secondary tectonic effect. Based on these comparisons, the current geothermal power station’s location corresponds to the shallowest depth of the Curie point, we conclude that these methods provide geologically sound results and that in the national geothermal evaluation plan Used together.