�ۺ��о���ͨ���¹�����˫���δ�������ԡ������Ժͺ��ͱ��Ͷȣ�ȷ���������ڱ����ĺ��ͱ��Ͷȼ��㷽��������ʵ�ʺ����Խ����˶Աȣ������˳����͹���Ժ����Ե�Ӱ�졣�о���˫���κ��ʹ���������Է�ɰ�ҡ�ϸɰ�Һ�ɰ����Ϊ�������ͼ���Ϊӫ�⼶���ϡ����ݰ����湫ʽ������ĺ��ͱ��Ͷȴ󲿷���ʵ�ʵĺ���������ϣ��������ͱ��Ͷ� 70%��50% �� 38% ֵ��Ϊ�������㡢�Ͳ㡢��ˮ���ˮ������ֱ�׼����������ĺ������ܵ������͹���������Ŀ��ƣ�����������Ҫ���ƴ������ʯ�ṹ�����ԣ�������������ľۼ������ڹ���߲�λ��ʵ�ʺ��ͱ��Ͷȱȼ�����Ҫ�ߣ����ڹ���Ͳ�λ��ʵ�ʺ��ͱ��Ͷȱȼ�����Ҫ�͡�

The comprehensive study of lithology��oil-bearing level and oil saturation of the 2nd Member of Shuangyang Formation established the suitable calculation method of oil saturation for block-C�� The effect of deposi- tion and structure on oil-bearing level was analyzed compared with actual oil-bearing level�� Oil reservoir rocks of the 2nd Member of Shuangyang ��eservoirs in the studied area are mainly siltstone��fine sandstone and glutenite�� Oil levels of reservoirs are all above fluorescence�� Most of calculated oil saturations��based on Archie��are consistent with the actual oil saturation�� Oil saturation of 70%��50% and 38% are regarded as the distinguishing criteria for gas layer��oil layer��oil-water layer and water layer�� The oil-bearing level of reservoirs in the studied area is con- trolled by both deposition and structure�� The deposition mainly controls rock textures and physical properties of the reservoir��while structure controls hydrocarbon accumulation��i. e�� ��the actual oil saturation in structural highs is higher than the calculated result��while in structural lows is lower than the calculated result��