岩性油气藏 ›› 2021, Vol. 33 ›› Issue (2): 135146.doi: 10.12108/yxyqc.20210214
杨洋1, 石万忠1,2, 张晓明1, 王任1,2, 徐笑丰1, 刘俞佐1, 白卢恒1, 曹沈厅1, 冯芊1
YANG Yang1, SHI Wanzhong1,2, ZHANG Xiaoming1, WANG Ren1,2, XU Xiaofeng1, LIU Yuzuo1, BAI Luheng1, CAO Shenting1, FENG Qian1
摘要: 页岩岩相的识别是页岩气勘探开发的基础工作,不同类型页岩具有不同物质组分与组构,进而具有不同的脆性度和物性,目前利用测井曲线来识别页岩岩相的研究较为薄弱。以焦石坝地区五峰组—龙马溪组3口井的测井资料、岩心测试数据为基础,通过多参数优选、多元线性拟合,分别建立了黏土矿物、硅质矿物相对含量的预测方程,探讨利用测井曲线识别页岩的方法。结果表明:黏土质页岩具有高DEN,CNL,K,KTh,低U,U/Th的特征;混合质页岩具有中DEN,U,CNL,K,KTh,U/Th的特征;硅质页岩具有高U,U/TH,低DEN,CNL,K,KTh的特征,并以此为依据,建立了页岩岩相识别雷达图版,不同岩相所对应的测井曲线数值在图版中有不同的分布范围,该图版可以有效识别页岩岩相,并能够对预测方程识别错误的岩相进行纠正,预测结果与实测值吻合度高。将预测方程定量识别岩相和雷达图版定性识别岩相结合起来,通过双重约束,可以很好地识别焦石坝地区五峰组—龙马溪组页岩岩相。
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