MH凹陷W组砂砾岩储层原始含油饱和度测井评价

Logging evaluation for original oil saturation of glutenite reservoir of W Group in MH Depression

朱键,范希彬,高阳,王英伟,伍顺伟,覃建华,何金玉

ZHU Jian, FAN Xibin, GAO Yang, WANG Yingwei, WU Shunwei, QIN Jianhua, HE Jinyu

中国石油新疆油田分公司勘探开发研究院，新疆 克拉玛依 834000

Research Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay 834000, China

MH凹陷W组储层以砂砾岩为主，储层岩石孔隙结构变化较大，非均质性强，导致水层具有较高电阻率响应等问题，仅依据常规测井资料难以准确评价储层含油饱和度。文中基于核磁测井资料，采用三孔隙法对储层岩石进行孔隙结构划分，在此基础上，依据阿尔奇公式提出含油饱和度参数，并结合储层岩心含油饱和度实验，分别建立了各类孔隙结构储层含油饱和度参数与储层原始含油饱和度的拟合关系，以此实现全井段评价。应用结果表明，该方法能够较好地评价研究区储层岩石孔隙结构，并提升储层原始含油饱和度评价效果。

The formation of W Group in MH Sag is dominated by glutenite. The pore structure of the formation rock changes greatly and the heterogeneity is strong, which leads to problems such as high resistivity response of the water layer, which makes it difficult to accurately evaluate the oil saturation of formation based on conventional logging data. Based on nuclear magnetic logging data, this paper uses the three-porosity method to classify the pore structure of the formation rock; on this basis, the oil saturation parameter is proposed according to the Archie formula, and combined with the formation core oil saturation experiment, various pore structures are established. The fitting relationship between the reservoir oil saturation parameter and the original oil saturation of the formation can be used to realize the whole interval evaluation. The application results show that this method can better evaluate the pore structure of the formation rock in the study area and improve the evaluation effect of the original oil saturation of the formation.

10.6056/dkyqt202104014