【摘要】 鉴于两点地质统计学在沉积相建模中存在不能模拟多种微相空间接触关系的缺点,尝试用多点地质学建立苏49-01区块辫状河沉积微相模型。首先结合地震属性、露头观察、相似沉积环境密井网区地质认识和相关文献等资料分析了辫状河各微相的地质要素和空间接触关系,建立了研究区石盒子组盒8下段辫状河三维训练图像。然后以井上解释的沉积微相作为建模硬数据、地震反演成果作为软数据,利用多点地质统计学建模方法建立了苏49-01区块河流相三维沉积微相模型。研究结果表明,用多点地质统计学整合地质模式和地震数据建立的沉积微相模型能更准确地反映辫状河各沉积微相的空间展布,为苏里格气田有效砂体分布预测这一地质难题的解决提供了新的手段,对苏里格气田开发具有重要指导意义。更多还原

【Abstract】 Provided that sedimentary facies modeling based on two-point geostatistics is unable to present complex space relationship of multiple microfacies, in this paper multiple-points geostatistics is introduced to the 3D braided river sedimentary facies model of Block SU49-01 of Sulige gas field. The geologic element and space contact relationships of different microfacies of braided river is established through comprehensive analysis of all kinds of materials including seismic attributes, outcrop observation, geological understanding of similar sedimentary environment in dense well net block and related literature material, and then the 3D braided channel microfacies training image of 8th lower member of Shihezi Formation is made. With the hard data of well point microfacies interpretation and soft data of P-sonic impedance, three-dimensional microfacies model is created with the method of multiple-point geostatistics constrained with seismic data. Integrating geological model and seismic data, the sedimentary facies model built with multiple-point geostatistics reflects the sedimentary microfacies space distribution in braided river more accurately, which provides a new measurement to predict the distribution of effective sand-body and has a guiding significance for gas development at Sulige gas field.更多还原