苏里格地区致密储层岩性测井精细识别方法研究

A Research on Identification Method of Lithologic Logging for Tight Reservoirs in Sulige Area

苏里格地区致密砂岩储层沉积环境复杂,非均质性强,依靠传统的岩性识别方法难以对储层岩性进行有效区分,影响油气开发生产。根据砂岩粒度将主要岩石类型划分为煤、泥岩、细砂岩、中砂岩与粗砂岩,在此基础上选取自然伽马、声波时差、补偿密度和补偿中子作为主要特征参数,建立两步剥离的Fisher判别模型,判别准确度可达85.7%,识别准确度高,满足了研究区有利储层识别的需求。

The sedimentary environment of tight sandstone reservoir in Sulige area is complex,with strong heterogeneity.The traditional lithologic identification method cannot effectively distinguish the lithology of the reservoir,which affects the identification of high-quality reservoirs in the study area.The main rock types are divided into coal,mudstone,fine sandstone,medium sandstone,and coarse sandstone based on the particle size of sandstone.On this basis,gamma,acoustic time,density and neutron are selected as the main characteristic parameters for lithologic identification,and a two-step Fisher discriminant model is established.The discrimination accuracy can reach 85.7%and the recognition accuracy is high.This satisfies the need for subsequent identification of favorable reservoirs in the study area.