致密火山碎屑岩含气敏感属性研究  

Research on the Gas Sensitive Attribute of Tight Volcanic Clastic Rock

作　　者：许翠霞[1] 马朋善[2] 贾志坤[1] 杨振武[1] 

机构地区：[1]中化石油勘探开发有限公司,北京100031 [2]中国石油勘探开发研究院,北京100083

出　　处：《非常规油气》2016年第5期8-13,共6页Unconventional Oil & Gas

基　　金：国家高技术研究发展规划(863计划)(2013AA064902)

摘　　要：致密火山碎屑岩储层薄、岩性致密、纵波速度对含气层的敏感性变差,导致纵波阻抗不能有效区分含气层。针对此问题,开展了致密火山碎屑岩含气敏感属性研究。结果表明,致密火山碎屑岩纵横波速度比（vP/vS）分布范围为1.6-1.85,比常规砂岩纵横波速度比范围要小,导致含气性探测难度大。通过致密火山碎屑岩测井数据分析表明,Kρλ/μ比Kρ对气层更为敏感。因此针对性地提出了新的弹性参数组合Kρλ/μ,理论分析表明,其能够提高气层检测敏感性。实践结果证实,通过三维地震资料叠前同时反演并计算Kρλ/μ属性体,分辨率较高;同时Kρλ/μ与σ、λ/μ交会图识别气层效果好,对解决复杂火山碎屑岩致密气层识别问题具有推广应用价值。Due to tight volcanic clastic rock reservoir is thin and has tight lithology, the sensitivity of longitudinal wave ve- locity to the gas zone would become weak, and result in the gas layer could not be distinguished effectively by longitudinal impedance. Therefore, the gas sensitive properties of tight volcanic clastic rocks have been studied. The results showed that the range of velocity ratio （vp/vs） of longitudinal and transverse waves is between 1.6 and 1.85, which is less than that of conventional sandstone, leading to a difficult detection of gas layer. Analysis of logging data for tight volcanic clastic rock indicated that Kρλ/μ was more sensitive to gas layer than what Kp did. So, a new elastic parameter combination Kρλ/μ has been put forward, and indicated that it could improve the sensitivity of gas layer detection by theoretical analysis. The practical application has also confirmed that resolution was higher based on the prestack simultaneous inversion of 3D seismic data as well as the calculation of Kρλ/μ attribute body. At the same time, the recognition effect of gas reservoir would be better by using the intersection graph of Kρλ/μ with both cr and λ/μ, which has the promotion and application value for detecting the gas reservoir in complicated tight volcanic clastic rocks.

关 键 词：致密火山碎屑岩 Kρλ/μ 弹性参数 叠前同时反演 

分 类 号：P618.13[天文地球—矿床学]