YQ地区奥陶系碳酸盐岩岩溶储层地震属性预测

YQ地区奥陶系地层碳酸盐岩储层发育,储集类型以岩溶孔洞、裂缝型为主。由于储层非均质性极强,横向变化快,加之溶洞受填隙物及填充程度的影响,使得储层预测的难度很大。从奥陶系碳酸盐岩储层的地球物理响应特征出发,形成1套以地震属性优选、多属性融合、三维像素属性雕刻等为主的地震预测技术流程。利用这些技术手段对奥陶系岩溶孔洞类储层、风化壳顶面储层进行了预测,对这2类储层在平面和空间上的分布特征进行了定性描述和分析,其结果与实钻情况吻合,取得了较好的应用效果。

Seismic attributes prediction of Ordovician carbonate karst reservoirs in YQ area

In the Ordovician carbonate reservoirs in YQ area,karst cavities and fractures are dominant.The reservoirs are difficult to predict due to severe reservoir heterogeneity and drastic lateral changes as well as the effects of interstitial material and filling degree on cavities.Based on the characteristics of the geophysical response of the Ordovician carbonate reservoirs,a seismic prediction technology has been developed,including seismic attributes optimization,multi-attribute integration,and voxel attributes delineation.The technology has been applied to predict Ordovician karst reservoirs and top weathering crust reservoirs.The spatial distribution of the two types of reservoirs has been qualitatively described and analyzed,and the results coincide with practical drill data.