华庆地区延长组长6储层不同类型成岩相微观孔隙结构特征及生产动态分析

利用铸体薄片、扫描电镜、X衍射、物性、高压压汞等分析测试手段以及试油试采资料,深入分析了超低渗储层成岩相及其微观孔隙结构特征,分析了其生产动态.结果表明:优势成岩相主要有水云母胶结-残余粒间孔+长石溶蚀相、长石溶蚀+水云母胶结-残余粒间孔相、长石溶蚀+绿泥石膜胶结-残余粒间孔相等.不同类型成岩相微观孔隙结构特征及生产动态特征不同,水云母胶结-残余粒间孔+长石溶孔相孔喉比高且配位数高,试采初期日产液低,含水率低且稳定,稳产周期较长;长石溶孔+绿泥石膜胶结-残余粒间孔相孔喉比高且配位数低,试采初期日产液高,含水率高且上升较快,稳产周期较短.

Diagenetic facies and its micro-pore structure of Yanchang formation Chang 6 reservoir in Huaqing area

Testing methods of casting thin sections,SEM,X-ray diffraction,physical properties,high pressure injection and test data on oil and production were all used for an in-depth analysis of the diagenetic facies and its micro-pore structure of the low permeability reservoir.The production performance was also analyzed.The results showed that the main advantages of the diagenetic facies were the hydromica cementation-integranular pore and feldspar dissolution diagenetic facies,feldspar dissolution and hydromica cementation-integranular pore,feldspar dissolution and chlorite cementation-integranular pore.The features of microscopic pore structures and production performance of various types of diagenetic phases were different.The pore-throat ratio of the hydromica cementation-integranular pore and feldspar dissolution diagenetic facies was high and the coordination number was also great,so that the daily fluid production of the initial pilot development was low,the moisture content was low and stable and the period of stable yield was the longest.The pore-throat ratio of the feldspar dissolution and chlorite cementation-integranular pore diagenetic facies was high and the coordination number was small,so that the daily fluid production of the initial pilot development was high,the moisture content was high and unstable and the period of stable yield was shorter.