二维核磁共振T_(1)—T_(2)谱在风西复杂碳酸盐岩储层流体识别中的应用

Application of Innovative T_(1)-T_(2)Fluid Typing Method in Complex Carbonate Reservoir of Fengxi Block

柴达木盆地风西湖相复杂混积碳酸盐岩油藏近来获得了勘探突破,实现了工业油气产能。目前的测井资料包含常规资料、高分辨率电成像、核磁共振及岩性扫描等资料,这些测井资料提供了储层评价中的关键参数,但作为储层评价重点的流体识别及饱和度评价,电阻率识别等常规方法存在较大不确定性,无法建立统一的储层流体识别图版。CMR-NG作为新一代的核磁共振仪器,提供连续的T_(1)、T_(2)谱及二维核磁共振谱,提高了孔隙度评价精度;同时利用T_(1)/T_(2)值定量评价各种流体组分体积,得到含油气饱和度等参数,达到识别储层流体的目的。在风西区块通过试油验证了该技术的可靠性,为该区块复杂混积碳酸盐岩储层流体评价提供更为有效的方法。

The commercial oil productions were achieved with the exploring of the complex mixed carbonate reservoir in fengxi block of Qiadam basin.The current logging suite to do the reservoir characterization include conventional logs,FMI,CMR and Litho-Scanner,which effectively provides the rich and accurate key reservoir properties.But evaluation standard and the big uncertainties cannot be solved with the conventional resistivity methods in this challenge reservoir.As a new generation CMR tool,CMR-NG provides the continuous T_(1),T_(2)and 2D T_(1)—T_(2)map measurements.It improved the accuracy and precision for porosity evaluation.Meanwhile the T_(1)—T_(2)map can distinguish the different fluid types and determine the volumes based on T_(1)/T_(2)ratio,and then provides the saturation,etc.The new technology was testified in Fengxi block,which provides more robust and effective fluid typing for this complex carbonate formation in Fengxi block.