吴92井区长4+5、长6油藏储层孔隙结构特征及敏感性分析

Analysis on Pore Structure Characteristics and Sensitivity of Chang4 +5 and Chang6 reservoirs in Wu92 Well District

白河吴92井区主力层位是长4+5、长6,通过砂岩薄片及扫描电镜发现研究区主要以溶孔和粒间孔为主。结合邻区吴仓堡地区的长4+5和长6油层组的毛管压力资料,将长4+5和长6油层组的砂岩储层孔隙结构分为3类。油区砂岩酸敏、水敏、盐敏、碱敏、速敏试验结果表明,长4+5、长6层均无酸敏,弱水敏;长4+5层中等偏弱盐敏,无碱敏,弱速敏;长6层无盐敏,无碱敏,中等偏强速敏。

The main layer of Baihe Wu 92 well district is Chang 4+5 and Chang 6. By means of sandstone thin sections and scanning electron microscopy, it was found that the study area was mainly composed of dissolution pores and intergranular pores. Combined with the capillary pressure data of chang4+5 and Chang6 formations in the adjacent Wucangbao area, the pore structures of sandstone reservoirs in Chang4+5 and Chang6 reservoirs were classified into three types. The acid-sensitive, water-sensitive, salt-sensitive, alkali-sensitive, speed-sensitive test on the oil area sandstone showed that, there was no acid sensitivity and weak water sensitivity in Chang 4+5 and Chang 6 layers;The Chang4+5 layer was medium to weak salt sensitive, there was no alkali sensitive, weak velocity sensitive;Chang6 layer had no salt sensitive, no alkali sensitive, was medium to strong velocity sensitive.