匹配追踪法在碳酸盐岩流体检测中的应用——以哈萨克斯坦楚-萨雷苏盆地为例

由于碳酸盐岩储层非均质性强、结构复杂,给含油气性的正确判识带来了较大困难.匹配追踪是目前较为有效的一种高精度时频域分解技术,基于含气储层的频率特性构造的流体活动性属性参数,可较好指示碳酸盐岩储层含油气的变化.以哈萨克斯坦楚-萨雷苏盆地ASA研究区碳酸盐岩储层为例,应用匹配追踪方法对地震资料进行高精度时频分解,根据地震波入射饱和流体多孔介质波动方程,建立流体活动属性与频率关系式,获得与流体性质密切相关的流体因子,对含气储层分布范围进行预测.经钻探证实,单井吻合率达86.3 % .这一预测成果对该地区的油气勘探具有重要指导作用,也为今后碳酸盐岩储层的勘探提供了一种很好的方法.

Application of matching pursuit method for detection of fluid in carbonate rock: a case study from Chu-Sarysu Basin in Kazakhstan

Carbonate reservoir is characterized with strong heterogeneity and complex structure, thus making it difficult to correctly identify oil and gas bearing properties. Matching pursuit is one of the effective high-precision time-frequency domain decomposition technology. Changes in oil and gas bearing properties can be better indicated by fluid activity attribute parameters, which are set based on frequency characteristics of gas-bearing reservoir. In a case study of carbonate reservoir of ASA study area in Chu-Sarysu Basin of Kazakhstan, the matching pursuit method is applied for high-precision time-frequency decomposition of seismic data. According to wave equation of seismic wave incidence into fluid-saturated porous media, relational expression between fluid activity attributes and frequency is built to obtain fluid factor in close association with fluid property and predict distribution scope of gas reservoir. As proved by drilling, coincidence rate of single well reaches 86.3 % .The prediction results provides an important guidance for oil and gas exploration in this area, as well as a better solution for carbonate reservoir exploration in the future.