准噶尔盆地排2井区岩性油藏的地震正演模拟

Forward modeling for lithologic oil reservoir in Pai2 wellblock in Junggar Basin.

准噶尔盆地西缘新近系沙湾组发育了大量的岩性油藏,为了提高岩性油藏预测的准确性,以钻井和地震资料为基础,分析了排2井区的地层层速度,进行了地质地震层位的标定。应用流体替换方法对排2井区储层的含油和含水情况进行了正演模拟。模拟结果显示储层能量强度呈明显的变化特征,对油水界线点可进行准确的预测。排2井区油藏分布与地震属性具有良好的对应关系,利用该方法在该区发现了5个含油砂体,扩大了含油面积。

Lithologic oil reservoirs were developed in large amount in Sha- wan formation of Neogene System in the west margin of Junggar Basin.In order to increase the prediction accuracy of lithologic oil reservoir,interval velocity around Pai2 wellblock was ana- lyzed,and seismic horizons were calibrated accordingly based on drilling and seismic data.The'fluid replacement'method was used for the forward modeling of oil-bearing probability and water cut in Pai2 wellblock.The results show that the energy intensity of reservoir bed varied greatly,and it can be easy to predict oil- water surface.Reservoir distribution and seismic attribute in Pai2 wellblock have good corresponding relationship.After the method was used,five oil-bearing sandbodies have been found in this ar- ea,which make the discovered oil-bearing area increased.