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本文是利用叠前弹性参数反演结果进行致密性含气砂岩储层预测的一个实例研究。随着油气勘探开发的发展,叠前地震数据及其反演结果的应用研究已经广泛用于实际生产中。叠前地震数据的特有属性研究,不仅包括简单的AVO特性,还包括其他的弹性属性的变化特性。本文通过对含气砂岩岩芯弹性属性参数响应特征的分析,发现特定弹性属性参数或其组合可以作为流体检测因子。因此,可以利用叠前地震反演得到不同的弹性属性参数结果,进行储层解释和储层描述。该叠前反演方法是基于Zoeppritz方程的Aki-Richard简化公式建立起来的,根据测井数据和地质解释结果建立初始反演模型,反演的地震数据为叠前时间或深度偏移的共反射点道集数据,反演结果可以是不同的弹性属性参数及其组合。通过对一实际的致密性含气砂岩储层进行叠前弹性属性参数反演,并将反演结果与其它预测结果进行对比分析发现弹性属性参数λ和λρ,λ/μ,以及K/μ能够很好地预测含气储层,而且反演结果很好展现出储层中的含气特性。
This paper is an example of the prediction of tight gas-bearing sandstone reservoirs using the inversion results of prestack elastic parameters. With the development of oil and gas exploration and development, the application research of prestack seismic data and its inversion results has been widely used in actual production. The study of peculiar attributes of prestack seismic data includes not only the simple AVO characteristics but also the variation characteristics of other elastic properties. Based on the analysis of the response characteristics of the elastic property parameters of gas-filled sandstone cores, we find that the specific elastic property parameters or their combination can be used as the fluid detection factor. Therefore, different elastic property parameters can be obtained by prestack seismic inversion to explain the reservoir and describe the reservoir. The prestack inversion method is based on the Aki-Richard simplified formula of the Zoeppritz equation. The initial inversion model is established based on well logging data and geological interpretation results. The retrieved seismic data is the co-reflection of prestack time or depth migration Dot gather data, inversion results can be different elastic attribute parameters and combinations. Through the inversion of prestack elastic property parameters of an actual tight gas-bearing sandstone reservoir, and comparing the inversion results with other predictions, the elastic property parameters λ and λρ, λ / μ, and K / μ can be calculated Well-predicted gas reservoirs, and the inversion results well show the gas-bearing properties of the reservoir.