利用自然伽马曲线确定煤层粘土矿物含量

Determination of Clay Mineral Content in Coal Seams by Using Natural GR Curve

文章通过制定科学的参数井选井原则,在岩心归位的基础上分析了柿庄南、柿庄北区块3号煤自然伽马曲线与粘土矿物、灰份、井径的相关关系,发现利用自然伽马曲线通过一元回归、多元回归、约束最优化模型等计算方法计算煤层工业组分并不准确。通过统计数据拟合找出了自然伽马曲线与粘土矿物含量在该区的经验线性关系,并利用该经验公式确定了目的煤层中粘土矿物的含量,为该区后期完井工艺的改进及分析提供了依据。

Through setting the scientific principles of parameters of wells,the paper analyzes the relationships between the GR curve and the clay minerals,coal ash content and borehole diameter of No.3 coal seam in Southern and Northern Shizhuang Blocks based on the core location.It is found that it is inaccurate to calculate the components of coal seam by using natural GR curve with calculation methods of nivariate regression,multiple regression constrained optimization models.Empirical linear relation between natural GR and the content of clay minerals can be obtained by statistical data in this area,and using the empirical formula,the content of clay minerals in coal seam can be determined,which will provide reference for the improvement and analysis of the completion technique in the future.