摘要
白垩系巴什基奇克组地层是新疆塔里木油田库车坳陷克拉苏构造带主要的低孔隙度砂岩储集层。岩心实验数据表明,该套储层基质具低渗透率低孔隙度的特征,而实际钻井数据显示在井漏段常见中高角度张开缝,在油基钻井液环境下,以往多以声波成像测井及油基钻井液成像测井(OBMI)为主,而OBMI受其分辨率限制,多对地层界面较敏感,对张开缝识别具有难度;声波成像测井通常被用来识别张开缝,但也受其分辨率限制,通常仅对较大的主裂缝有响应,而相对小规模的裂缝响应具有局限性,且无法进行地层倾角提取。针对以上困难,提出适用于塔里木油田库车坳陷5.875 in*小井眼的高分辨率及高覆盖率的新一代油基钻井液电成像测井(NGI)。利用NGI反演处理后得到的图像可区分张开缝和闭合缝,裂缝区分结果与岩心资料一致。通过高分辨率NGI反演图像,识别高陡地层,分析高陡地层成因,为巴什基奇克组地层强挤压应力环境下高陡地层储层评价的电阻率校正提供可靠依据。
The Cretaceous Bashkiqik formation is the primary low-porosity sandstone reservoir in the Krasu tectonic belt in the Tarim basin.Core data shows the reservoir with low porosity and permeability,while actual drilling data has proved that high-angle open fractures in the interval with lost circulation.When drilling using oil-based mud,acoustic logging and oil-based mud image logging(OBMI)are usually used to detect open fractures.With limited resolution and sensitive to information boundary,OBMI can’t well identify open fractures.acoustic logging can only responds to large open fractures,but ignore small fractures.Its resolution is not enough too,and it can’t provide formation dip data.This paper proposes a new-generation oil-based resistivity image logs(NGI).It provides high resolution and coverage,and it is suitable for 5.875 in slim holes in the Kuqa depression in Tarim oilfield.The image from NGI data inversion can distinguish open fractures from close ones.The result is consistent with core observation.The high-resolution NGI image can be used to identify high-angle formation and structure genesis analysis.It provide reliable data to correct the resistivity of the highly dipped formation formed in an environment with strong stress in the Bashkiqik formation.
作者
赵元良
葛盛权
韩闯
莫静
帅士辰
魏国
潘峰
ZHAO Yuanliang;GE Shengquan;HAN Chuang;MO Jing;SHUAI Shichen;WEI Guo;PAN Feng(PetroChina Tarim Oilfield Company,Korla,Xinjiang 841000,China;Schlumberger China,Chengdu,Sichuan 610500,China;Schlumberger China,Beijing 100020,China)
出处
《测井技术》
CAS
2019年第5期514-518,共5页
Well Logging Technology
