Ӧ��ƫ����΢����ɨ��羵�� X- -��������ȷ���������������ʮ������Ӫ���鴢��ɰ�ҵĴ����������������ü���϶�ݻ���������ϸ�����ͷ������������: ʮ������Ӫ���鴢��ɰ�ҵ���ʯ������ҪΪ��м��ʯɰ�Һͳ�ʯ��мɰ�ң����Ϊ��ʯɰ��; ��������Ҫ����������ѹʵ���á��������á���ʴ���úͽ�������; ���ҽ׶��Ѵﵽ�г��ҽ׶� A- B �ڡ�ɰ�ҵĺ��������- -�ͺ��𣬿�϶��ƽ��Ϊ 8% ��10%����͸��ƽ��Ϊ 15 × 10 ^-3 �� 26 × 10 ^-3 μm ² �����ڵͿ�- -�صͿ�—�ص���- -�����ʹ��㡣

Based on the technical methods of polarizing microscope��scanning electron microscope and X- ray diffraction��the reservoir characteristics��diagenesis and pore evolution of Yingcheng Formation sandstone reservoir in Shiwu Oil Field were studied�� Detailed description and analysis results show that the sandstone mainly are lithic arkose and feldspathic litharenite in type��followed by arkose�� The sandstone experienced compaction��cementa- tion��dissolution and metasomasis during the diagenesis�� and then it is in the A- B phase of middle diagenesis stage�� The pore throat of the sandstone belongs to medium- low size��the average porosity is mainly 8% ��10% and average permeability is 15 ×10 ^-3 μm ² ��26 ×10 ^-3 μm ² ��which indicates the reservoirs with low- ultra low porosity and ultra low- medium permeability��