复杂碎屑岩矿物组分最优化测井定量分析

Optimal Quantitative Logging Analysis on Mineral Components of Complex Clastic Rocks

为获得塔中地区志留系柯坪塔格组连续性地层沉积剖面,采用薄片鉴定资料和X射线衍射分析数据,建立了多矿物模型,采用拟牛顿法对8条测井曲线进行处理,获得研究区碎屑岩矿物组分和孔隙流体含量及相应的理论计算测井曲线;用置信区间法和目标函数值法对理论计算测井曲线进行质量检验表明,理论测井曲线与实际测井曲线之间平均相对误差仅为7.88%;采用薄片鉴定资料和X射线衍射分析数据进行验证,表明最优化测井解释所得矿物组分含量与测试分析数据高度吻合。计算结果为岩性精细划分、油水层识别、沉积环境分析及成岩作用研究提供了定量数据。

To obtain continuous stratigraphic sedimentation sections of Silurian Kepingtage formation in Tazhong area, Tarim Basin, a multimineral model is established using the data of thin section identification and X-ray diffraction analysis. Quasi-Newton method is used to process the 8 logging curves and mineral components of clastic rocks, pore fluid content and the corresponding theoretical calculated logging curves are gained in the study area. Verification of the theoretical calculated curves by means of confidence interval method and objective function value method shows that the relative error between theoretical and actual logging curves averages 7.88%; analyses on thin section identification and X-ray diffraction data show that the mineral component contents obtained from the optimal logging interpretation match well with that from practical analysis data. The calculated results can provide quantitative data for detailed lithology classification,oil and water layer identification, depositional environment analysis and diagenesis study.