特低渗透储层测井系列优化评价研究——以HQ地区特低渗透储层测井系列评价效果分析为例

长庆油田HQ地区长6储层属于低孔、特低渗、复杂岩性、复杂孔隙结构储层,其烃类所占岩层体积比例不足8%,油气储层测井响应十分复杂。本文利用特低渗储层类型识别、储渗特征和含油气性质分析,对11种常规测井方法进行了优化评价研究。通过统计分析区内100多口井的目的层段1000多个不同类型油气储层测井评价效果,有效地阐明了特低渗透储层勘探开发中不同系列测井方法的作用和效果,通过加强测井系列采集和资料深化研究,提出了在特低渗透油田中选择测井技术系列的原则。其中岩性系列以自然电位测井效果为好,井径和有效光电吸收截面测井居中,自然伽马测井较差;孔隙度系列以密度测井效果为好,中子孔隙度测井居中,声波时差测井较差;电阻率系列以阵列感应测井效果为好,俄罗斯感应测井居中,双感应及微电极系测井较差。

Ultra-low permeability reservoir logging series evaluation in HQ area

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.