相控随机建模技术在非均质性研究中的应用

Application of facies-controlled stochastic modeling in heterogeneity study

吴星宝 李少华 尹艳树 朱永进 徐中波 熊 冉

长江大学油气资源与勘探技术教育部重点实验室，湖北 荆州 434023 长江大学地球科学学院，湖北 荆州 434023

油田开发中后期的精细油藏描述关键在于如何详细描述储层的非均质性。采用相控储层建模的方法，建立了大庆油田古龙北地区扶余油层的构造模型、沉积相模型以及物性模型，并在此基础上对研究区的非均质性进行了描述，认为：研究区平面上由北向南非均质性逐渐增强、层间隔层比较多、层内非均质性严重。对比其沉积相模型，储层非均质性主要受沉积相的展布控制；河道储层的物性较好，非均质性弱；决口扇砂体厚度虽然较大，但因泥质夹层的存在，使其物性相对较差，非均质性强。

The key offinereservoirdescriptionishowto describe the heterogeneityofreservoir in themiddle-latestage ofoilfield development. This article takes the facies-controlled reservoir modeling method to establish the structural model, sedimentary facies model and petrophysical model in Gulongbei Area of Daqing Oilfield. Based on the models, the paper analyzes the heterogeneity of research area. The heterogeneityis getting severe fromnorthtosouthontheplane ofresearch area.Thereare manyinterlayersbetweenthe layers and the
in-layer heterogeneity is severe. It can be known that the reservoir heterogeneity is controlled by sedimentary facies distribution after comparing the sedimentary facies models. The physical property of reservoir is good and the heterogeneity is weak in distributary channels. Although the crevasse splay sandbody has a great thickness, the physical property is poor and the heterogeneity is severe becauseoftheexistence ofmuddyintercalation.