塔北隆起跃满地区奥陶系一间房组缝洞型储层三维建模

3D Modeling of Fractured Vuggy Reservoir in Yueman Yijianfang Formation in Northern Tarim Basin

塔北隆起跃满地区奥陶系一间房组缝洞型碳酸盐岩储层受到构造和岩溶双重影响,不同的储集体尺度及形态差异大,储层非均质性强。因此,准确地刻画研究区储集体的形态及储层的展布对研究区的勘探开发具有重要意义。在研究区储层特征及储层纵向发育规律认识的基础上,结合地震、测井等资料,基于“多尺度多类型”的总体建模思路对研究区进行了储层建模。针对溶洞储层,优选出对溶洞反应灵敏的“特征属性”,分析得到截断值,基于“特征属性”建立“训练图像”,以测井资料作为硬数据,溶洞发育概率体作为软数据约束,进行建模;通过对地震资料进行人工解释建立了大尺度裂缝模型,对中尺度裂缝采用蚂蚁追踪技术进行确定性建模,对小尺度裂缝利用裂缝密度拟合函数,以蚂蚁体为约束进行了随机建模。采用同位条件赋值法对多个模型进行了融合,建立了跃满地区一间房组缝洞型碳酸盐岩储层三维地质模型。

The fractured vuggy carbonate reservoir of Yijianfang formation in Yueman block of northern Tarim Basin is affected by both structure and karst.Different reservoir sizes and shapes differ greatly,and the reservoir heterogeneity is strong.Therefore,it is of great significance for the exploration and development of the study area to accurately describe the shape of reservoirs and the distribution of reservoirs in the study area.Based on the understanding of reservoir characteristics and vertical development law of reservoir,combined with seismic,logging and other data,the reservoir modeling of the study area is carried out based on the overall modeling idea of multi-scale and multi type.For the karst cave reservoir,the sensitive characteristic attribute to the karst response is optimized,the cut-off value is obtained through analysis,the training image is established based on the characteristic attribute,and the modeling is carried out with the well seismic data as the hard data and the cave development probability body as the soft data constraint.Through manual interpretation of seismic data,a large-scale fracture model is established,and ant tracking technology is used for deterministic modeling of medium-scale fractures.For small-scale fractures,density fitting function is used,and ant body is used for random modeling.By fusing multiple models with assignment of apposition conditions method,the three-dimensional geological model of fracture vuggy carbonate reservoir in Yijianfang formation of Yueman block is established.