����ƫ����΢����ɨ��羵�� X- -����ȷ����ֶλ�ȡ�����ݺ����ϣ������Ա������ڳ���ˮ���ʡ��Դ CO 2 ���塢����ˮ����ѹ����ͳ�ע����ȶԴ����������Ŀ������á��о����������ڳ���ˮ�����Ǵ����������ľ��������أ�΢��ˮ- -����ˮ���财���������������ʯΪ������ˮ���财����������Ը���ʯΪ��; �Դ CO 2 ������λ��������ԵĴ��������Ȳ���ЧӦ�������� I/S �� S%��������ͬ������ң������и���ʯ��������ƫ�ߡ�Ƿѹʵ��ѹ����������ݻ������ͺ󣬱����� I/S �� S%��������ͬ������Һͳ�ѹ���㡣���������ʯ��������Զ���������ȵ�ˮ�㣬�������ע����Я�����л������ʴ�����йأ����⣬�����ע���γɵĶ��Գ��һ���Ҳ�����ڸ���ʯ�ı��棬����ʯ�ĸߺ����������Ͳ㼰���������Ӧ; �ܴ���ˮ���˵Ĵ��㣬�Գ�ʯ������ʴ����������ʯΪ�����������϶��һ��ϸߡ�

By methods of thin section��scanning electron microscope and X- ray diffraction��the authors ana- lyzed the controlling effects of the early sedimentary water medium��CO₂ fluid��atmospheric water��and overpressure fluid��as well as the hydrocarbon fluid to clay mineral in reservoir�� Evidence showed that the sedimentary water me- dium played a decisive role in determining the constitution of clay minerals: the sand reservoirs deposited in brack- ish water lake��which often accompany with higher illite content; while the sand reservoir deposited in fresh water environment��which often accompany with higher kaolinite content�� The invasion of CO₂ fluid could bring obvious reservoir reconstruction and thermal fluctuation�� the S percentage content of I/S in the CO₂-bearing reservoir is low- er than mudstone at approximate depth��and the content of kaolinite in the reservoir is higher�� The clay evolution in under- compaction overpressure reservoir is obviously lag behind��indicating that the S% content in I/S is lower than the same depth of mudstone as well as normal pressure reservoir�� After hydrocarbon invasion��it is often accompanied by feldspar dissolution and the higher content of kaolinite�� The feldspar dissolution may result from the organic acids migrating with hydrocarbon��the higher content of kaolinite may result from the protection from the inert diagenesis environment influenced by the hydrocarbon invading��and the reservoir with high content of kaolinite layers often correspond to the oil- bearing layer and the high permeability layer�� ��eservoir influenced by atmospheric water is characterized by feldspar dissolution and kaolinite enrichment��and generally accompany with high porosity��