【摘要】 岩石物理是研究储层参数和岩石弹性参数之间关系的基础,在储层特性和地震特性之间起到了桥梁作用.为了更加精细的识别岩性,更好的进行砂泥岩储层油气的识别和预测,需要基于岩石物理寻找有效的识别方法.本文基于微分等效介质理论构建了砂泥岩储层岩石物理模型.为了考虑砂泥岩储层流体分布的非均匀性,模型中采用了斑块状饱和理论.文中分析了砂泥岩弹性参数和储层物性之间的关系,给出了各物性参数对弹性参数的影响结果,并根据储层物性的影响绘制了弹性参数交会模板.不同于常规交会分析,该弹性参数交会模板综合考虑了孔隙度、含水饱和度、泥质含量和孔隙纵横比等参数的影响,更加真实地反应了储层的地下特征.该交会模板的优势在于可以合理的界定出储层的砂、泥岩范围,而且根据泥质含量等参数的不同,可以进一步界定储层岩性的范围,为储层岩性的精细识别提供了新的方法.通过实际井资料的应用,该交会模板做到了砂泥岩储层岩性的有效区分,另外根据交会模板中泥质含量的不同,由0.5到0.25,我们可以在地震剖面中做出砂岩储层范围的精细界定,较好地识别了岩性,为寻找储层提供可靠依据.更多还原

【Abstract】 Rock physics is the basis to study the relationship between reservoir parameters and rock elastic parameters,which plays a role as a bridge between reservoir properties and seismic characteristics.Through rock physics modeling,the relationship between reservoir parameters and the elastic parameters of rock can be built,to study the reservoir characteristics reasonably and reduce exploration and development risk.For more precise identification of lithology,and the better identification and prediction of Sand mudstone reservoir,an effective method of identification based on rock physics is need to be found.Based on differential effective medium model,a rock physics model for sand shale reservoir is built.In order to consider the heterogeneity of fluid,the patchy saturation theory is used in this model.We analyze the relationship between reservoir parameters and rock elastic parameters in theory,and give the results of the changes of all kinds of elastic parameters caused by the difference of reservoir parameters.Then we build the rock elastic parameters cross plot template considering the influence of reservoir physical property.Porosity,water saturation,shale content and aspect ratio of pores are considered comprehensively in the cross plot template,which is different from other regular templates.The template can distinguish between sandstone and mudstone effectively,and easily define the scopes of sandstone and mudstone.If the different clay content is given in this cross plot template,the different recognition precision of the reservoir lithology can be shown.By applying the actual well data,the sandstone and the mudstone are distinguished effectively.In addition,according to the change of the clay content in the cross plot template,from 0.5 to 0.25,the boundary of the sandstone can be defined precisely in the seismic section.The cross plot template built provides a better method to identify lithology,and provides a reliable basis for looking for the reservoirs.Application examples prove the validity of this identification method.更多还原