Isologger钻井液同位素录井仪组成及应用

Components and Application of Drilling Fluid Isotope Logger

摘要: 钻井液气体同位素录井(MGIL)是一门新兴的录井技术。国内传统的同位素分析通常为离线分析，时间成本和资金成本较高；而中法渤海地质服务公司在同位素录井服务中使用的Geoisotope在线同位素录井仪虽然实现了同位素数据的在线测量，但仅能提供甲烷的同位素数据，并且尺寸较大，数据易受外界因素影响。英国CSS公司研制的Isologger钻井液同位素录井仪，采用了稳定同位素比率质谱仪(Isotope-ratio mass spectrometry，简称“IRMS”)，该设备具有体积小、测量精度高、受外界影响较小的特点；合理地引入了气相色谱分离单元，使得Isologger能够通过在线分析得出C₁~C₅的同位素数据，丰富了采集的同位素数据信息。该仪器以多组分的同位素数据为基础，可在现场进行井下油气层分析、烃类成熟度分析等工作，极大地提高了录井工作的指导地位。同位素录井在深海、非常规油气层、高温高压含硫地层等区域有着很好的应用前景。

Abstract: This MGIL (Mud gas isotope logging) was a newly emerged well logging technique. The conven-tional isotopic analysis in China was normally offline in the laboratory, and thus it cost much time and money. Though measuring online, Geoisotope used in Sino-France geological isotope logging service could only test methane isotope data, and it was larger in size and susceptible to the influence of external environment. The mud isotope logger, isologger developed by the British CSS (Compact Science System) Company, equipped with Isotope-ratio mass spectrometry (called IRMS), was smaller in size, higher in accuracy, and less susceptible to the influence of external environment, in which a gas chromatogram separation unit was rationally introduced. Thus the Isologger could measure isotope data of C₁-C₅ online, and it enriched the isotope information to mud log. Based on isotope data of multiple components, hydrocarbon maturity analysis and down hole oil formation analysis can be carried out locally, which greatly enhances the guidance function of mud logging. Isotope logging has bright application prospects in deep sea area, unconventional reservoirs, and high temperature, high pressure and high sulphur content reservoirs.