����̽���״￱̽�����Զ�����˹���������������ǰԵ��������ƽԭ��֧�ӵ�¶ͷɰ����ķֲ���������ʵ�Ⲣ�������о���������ҪΪ���ҡ��������- -ϸɰ�һ��㣬�б��������ң��Ҷ����ضα�㸲�� 1 ��5 m ��Ļ��������״��������һϵ�����ݴ����������� 7 ����Ҫɰ����ĺ������Ϊ 54 m��83 m��54 m��38 m��104 m��160 m��191 m; �߶�����Ϊ6 m��7 m��5 m��8 m��6 m��10 m��9 m���Ȳ���; ɰ���峤���ֵ����Ϊ 9��11. 8��10. 8��4. 8��17��16��21. 2���ӵ�ɰ���������ߵı�ֵ������ ��15���������ɰ�����Ҹ���ʽ�������졣ɰ�������ֹ���״����ƽ���ײ�ͻ��͸������̬���ӵ�������ڳ�����������ɰ�������Ǩ������ɰ������̽���״�����ķ���������۲���һ�¡�

The distribution characteristics of outcrop sandbodies of meandering river delta front and delta plain distributary channels in the Ordos Basin were observed and described by utilizing the GP�� exploration technique�� The lithology of the studied area is mainly mudstone�� interbeded mudstone and siltstone and fine- grained sandstone�� intercalated with thin layered tuff��mainly coverd by loess in 1 ��5 m thickness in the surface of the area�� A series of data processing and quantitative analysis of 7 main sand bodies��such as thickness��height��are given�� The later- al scales of sandstone body are 54 m�� 83 m�� 54 m��38 m��104 m��160 m��191 m and the vertical scale of sand body are 6 m�� 7 m�� 5 m�� 8 m�� 6 m�� 10 m�� 9 m�� The ratio of the length and thickness of sandstone is 9�� 11. 8�� 10. 8��4. 8�� 17�� 16�� 21. 2��respectively�� The ratio of the width and the overall height of the river sandstone body is higher than 15��and the overall presentation of the sandstone and mudstone is composite sedimentary structures�� The sandstone body presents isolated lens in shape with gentle top and protuberant bottom�� Multi- staged period dep- osition is obvious in longitudinal river sandstone body and there are lateral migration�� The reflection characteristics of the GP�� profiles agree well to the results��