论文部分内容阅读
勘探实践中,与水和油相比,地层岩石孔隙中含气引起的地球物理响应特征更加明显,因此利用各种地震弹性参数较容易判定和识别地层中是否含气.然而这种含气性的判别多是定性的,含气饱和度的半定量化预测一直是个挑战.利用岩心分析、测井和测试资料,从岩石物理模拟与诊断出发,结合Gassmann流体替换理论,分别研究含气砂岩和含气饱和度的敏感弹性参数,建立相应的岩石物理解释图版.在此基础上,通过地震叠前弹性反演技术分含气砂岩和高饱和度含气砂岩两步法递进式实现含气饱和度的半定量预测,取得了较好的应用效果.实例研究表明,在一定地质条件下,这种两步法递进式半定量预测砂岩含气饱和度的方法行之有效,实际生产中可操作性强,具有一定借鉴意义.
Compared with water and oil, the geophysical response characteristics caused by gas-bearing in formation rock pores are more obvious in exploration practice, so it is easier to determine and identify whether there is gas in the formation by using a variety of seismic elastic parameters. However, , The semi-quantitative prediction of gas saturation has always been a challenge.Using core analysis, well logging and test data, starting from the rock physics simulation and diagnosis, combined with Gassmann fluid replacement theory, the gas-bearing sandstone and Sensitive elastic parameters of gas saturation, and establish the corresponding lithophysical interpretation plate.On this basis, the gas-bearing sandstone and high-saturation gas-bearing sandstone are progressively realized by seismic prestack elastic inversion And semi-quantitative prediction of saturation, and achieved good application results.Examples show that under certain geological conditions, this two-step progressive semi-quantitative prediction of gas saturation of sandstone is effective, in actual production Operability is strong, with some reference.