摘要
疏松砂岩储层成岩过程简单,胶结疏松,对该类油藏的取心及获取孔隙结构与岩石组分信息较为困难,因此基于二维岩石信息的三维多孔介质重建方法对于该类储层的微观尺度模拟尤为适用,现有的重建技术虽然能较为准确地构建岩石骨架和孔隙结构,但无法对储层中的各类黏土矿物做详细的划分和构建。为准确构建含黏土三维多孔介质模型,基于真实储层二维信息,利用过程法构建多孔介质模型,并将其作为混合算法的输入模型构建了三维多孔介质模型,通过引入交换单位体像素点对其邻域不稳定性的贡献程度作为参数,可以提高混合算法的运算速度和准确性;重建模型与参考模型具有相似的统计学和拓扑学特征,以此为基础,结合真实储层中黏土矿物的分布及产状,通过Hoshen-Kopelman算法和黏土矿物基团的主要结构特征分类,构建了含黏土矿物分布的三维重建多孔介质;最后对重建模型中岩石矿物分布及结构特点进行了分析。结果表明,基于Hoshen-Kopelman算法的重建模型较好地反映了储层中主要黏土矿物的分布及产状,该算法为含黏土矿物疏松砂岩油藏的微观尺度储层模拟提供了新方法,基于该算法得到的三维多孔介质模型为模拟油气田开发过程中由于岩石矿物性质差异造成的储层伤害研究提供了新手段。
The diagenetic process of unconsolidated sandstone reservoir is simple with loose cementation,and it is difficult to obtain the core,porous structure and rock component information of such reservoirs.Therefore,the reconstruction method of three-dimensional porous media based on tow-dimensional rock information is particularly applicable for the micro-scale simulation of such reservoirs.The existing reconstruction technology is able to accurately construct rock matrix and pore structures,but unable to detailedly divide and construct various clay minerals in reservoirs.To accurately construct the three-dimensional clay-bearing porous media model containing clay mineral,based on the two-dimensional information of real reservoirs,the three-dimensional porous media is established by taking the porous media model constructed by process-based method as the input model of hybrid algorithm.The contribution degree parameter of exchange unit pixel points to its neighbor uncertainty is introduced to improve the arithmetic speed and accuracy of hybrid algorithm.The reconstructed model and reference model have similar statistical and topology characteristics.In combination with the distribution and occurrence of clay minerals in real reservoirs,the three-dimensional porous media with clay mineral distribution is reconstructed by using Hoshen-Kopelman algorithm and classifying the major structure characteristics of clay mineral cluster.Finally,the distribution and structure characteristics of rock clay minerals in reconstructed model are analyzed.The results indicate that the reconstructed model based on Hoshen-Kopelman algorithm is able to better reflect the distribution and occurrence of major clay minerals,providing a new method for microscopic simulation of the unconsolidated sandstone reservoirs with clay minerals.On this basis,the reconstructed three-dimensional porous media model can offer a new means for the simulation of formation damage caused by the differences in clay mineral properties during development processes.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2016年第8期1037-1046,共10页
Acta Petrolei Sinica
基金
国家重大科技专项(2009ZX05009)
国家自然科学基金项目(No.51104173)资助
