刘超,印长海,卢双舫
LIU Chao,YIN Chang-hai,LU Shuang-fang
摘要:
针对当前变系数ΔLgR烃源岩测井评价技术的关键参数主要通过经验确定,存在缺乏客观性、定量预测方法不足等问题,研究该技术内关键系数(k和a)的“外推性”,建立利用单井资料预测关键系数的方法。基于松辽盆地白垩系主要烃源岩层的测井和TOC分析数据,通过对比关键系数在稳定沉积地层和断陷复杂地层的外推效果发现,后者导致的TOC误差偏大,有必要研究针对单井的k值和a值的预测方法。建立了利用单井“声波时差—电阻率”交会预测k值的方法,预测结果的可信度可达到81%以上;建立了利用烃源岩厚度、成熟度和幅度差值计算系数a的公式,预测结果的可信度超过80%。该方法对沉积稳定地层和复杂地层都适用,可比目前外推方法误差降低10%以上。
中图分类号:
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