利用三维地震数据减少地质统计模型的不确定性

Decrease uncertainty of geo-statistical model by using seismic data

将三维地震数据应用于油藏地质模型 ,可以降低井间储集层估计的不确定性 ,需要采用地质统计学方法综合应用测井和三维地震数据。在四川盆地孝泉—青岗嘴构造带新场构造的储集层非均质性研究中 ,对 2 5口井的伽马测井数据进行三维变差函数分析 ,获得判别砂岩与泥岩的标准化伽马判别值 ,得到砂岩厚度分布图 ;利用协克里格方法得出协克里格方差模型 ,使硬数据 (井点的伽马测井曲线 )与软数据 (地震波阻抗 )的相关关系达到最优 ;综合地震数据和测井数据 ,获得砂岩有效厚度分布图。图 3参

The use of 3 D for a geo statistical modeling of reservoir will be able to reduce the uncertainty of estimated sand bodies. The method of geo statistical modeling via using the right seismic parameters is briefed as follows: quantity control to the input data by using the Variance Function; correlation analysis between the well data (hard data) and seismic parameters (soft data); finally, to decide the sand extent in 3 dimension by using the geo statistical methods (e.g. Co Krige), and achieve the optimized reservoir modeling. The example taken from the Xinchang Structure in the Xiaoquan Qinggangzui tectonic zone, Sichuan Province shows it is an effective way by using the seismic data to decrease the geological risk in field development.