改进的基于目标的高精度沉积微相建模方法在苏14加密实验区的应用

探讨适合鄂尔多斯盆地苏里格地区地质特征的相控建模方法。以苏里格气田苏14加密实验区为解剖对象,综合运用地质、测井和三维地震资料,在基于模型的测井约束反演结果基础之上,用反演波阻抗数据协同模拟泥质含量模型,进而利用泥质含量识别储层的下限标准建立岩相模型;再利用岩相模型对砂体规模和展布进行分析,并获得基于目标建模所需的各种参数;最后用基于目标体结果的方法(示性点过程法)建立高精度的三维沉积微相模型,开展不同"相控"条件下的属性模型比较分析。结果表明沉积微相控制下的属性模型中,心滩内部储层物性条件最好,其次是点坝,再次是河道微相;而以岩相控制的属性模型无法反映不同沉积微相内部储层物性参数的数学期望值与方差值,模拟结果具有较大的随机性。利用该方法所建的三维沉积微相模型可精细反映各微相的平面、剖面形态以及各微相的接触关系,其约束下的属性模型分相带反映储层的物性变化。

Application of the improved obj ect-based method of high resolution microfacies model to infilled wellblock Su1 4,Ordos Basin,China

The geological,well logging and seismic data in the Sulige area of Ordos Basin are studied in order to establish a microfacies modeling method suitable for the area.Reservoir lower limit standard is determined by shale content model derived from logging constrained inversion on the basis of geological model which collaboratively simulated the wave impedance and shale content. The parameters of the obj ect-based modeling are obtained on analysis of the dimension and distribution of sandstone based on the lithofacies model.Marked point process modeling method is used to build three dimensional high resolution microfacies model.Comparison of property models under different conditions indicates that property of mid-channel bar is better than that of point bar, and the microfacies of channel comes the last.The lithofacies-controlled model is stochastic as the model can not reflect expectation and variance of reservoir property of different microfacies.Three-dimensional microfacies model can be established with method mentioned above to reflect the plane and profile shapes of different microfacies as well as their contact relationship of the microfacies.The property model can represent features of reservoir property of different microfacies.