分段应用交会图技术识别火成岩岩性

TO IDENTIFY IGNEOUS ROCK LITHOLOGY WITH SUBSECTION CROSSPLOT TECHNIQUE

火成岩在岩性上远远复杂于碎屑岩和碳酸岩。岩性识别是储层评价的基础．提高岩性判断符合率一直是火成岩储层研究中的难题，常规测井交会图识别岩性方法比较常用，但直接应用两种测井曲线交会识别火成岩岩性效果不是很好。本文鉴于火成岩储层岩性识别复杂而且成功率低这一实际情况，采用新疆油田K92并区和DX地区资料做分析，建立岩心一测井数据库，然后对火成岩砻洼响应敏感的自然伽玛测井曲线进行分段，将大类岩性划分出来，然后应用多种曲线进行两两交会，进行火成岩的测井岩性识别研究，在工区取得了很好的应用效果。

Igneous rock is much complex than fragmental rock and carbonate rock in lithology.Lithologic identification is the foundation of reservoir evaluation.Improvement of coincidence rate of lithology judgement is always a problem in igneous reservoir research.Conventional logging cross-plot is often used to identify lithology,but it is not effective to identify igneous rock lithology by using the cross-plot of two logs directly.According to the difficulty and low success rate in igneous reservoir lithology identification,a core-logging database is established through analysis of the data in Block 92 and DX area of K oilfield in Xinjiang.GR log is sectioned because it is sensitive to igneous rock lithologioal response.Main types of lithology are divided,then the cross-plots of every two logs are used to identify igneous rock lithology.It has gained good effect.