Ultra-low permeability reservoir logging series evaluation in HQ area
Sun Baodian1, Song Ziqi1,2, Cheng Zhigang1, Jing Cheng3, He Yufei1,2, Zhang Liang1,2, Duan Qiong3, Li Miao3
1. Oil and Gas Evaluation Center,CNPC Logging Co.Ltd.,Xi'an,Shaanxi 710077,China;
2. College of Petroleum Engineering,Xi'an Shiyou University,Xi'an,Shaanxi 710065,China;
3. College of Petroleum Engineering,China University of Petroleum(East China),Qingdao,Shandong 266555,China
Abstract：The reservoir Chang 6 in HQ area is characterized by low porosity,low permeability,complex lithology,and pore structure.This makes logging response very complicated.Hydrocarbon in the reservoir is less than 8% of the rock volume.Using ultra-low permeability identification and permeability characteristics analysis,our study focuses on the optimization evaluation of 11 types of logging.After statistical analysis of logging responses of more than 1000 reservoirs in 100 wells,we divide these 11 types of logging into 3 kinds of responses,good,normal or poor response.The statistical analysis shows that the different logging methods have different functions and effects.In lithology logging series,the best one is SP logging,CAL and Pe logging are normal,and GR logging is a poor one.In porosity logging series,the best one is DEN logging,then CNL,and the last one is AC.In resistivity logging series,array induction logging is the best,Russian induction logging is normal,and dual induction logging micro-electrodes are poor.
