泊松阻抗在PX井区N1s1油气检测中的应用

Application of Poisson impedance attributes in hydrocarbon detection at first member
of Shawan Formation in PX well area

 时秀朋

 Shi Xiupeng

 中国石化胜利油田分公司勘探开发研究院西部分院，山东 东营 257000

 Western Branch of Research Institute of Exploration and Development, Shengli Oilfield Company, SINOPEC, Dongying 257000, China

 PX井区沙一段储层多为砂泥互层，储层厚度薄。声波在储层中的传播速度略大于在围岩的，在含油气后与在泥岩中的速度差异更小，利用常规的纵波阻抗难以检测储层含油气性。文中试图从弹性参数出发，引入泊松阻抗，利用泊松阻抗属性分析方法对PX井区沙一段储层进行了含油性检测。预测结果与已钻井测井解释成果相吻合，有效地预测了PX井区沙一段有利含油储层的分布特征；同时，也证实了泊松阻抗属性分析方法是进行储层油气检测的一种重要手段。

 Reservoirs at the first member of Shawan Formation in the PX well area are almost sand-mud interbed, and the reservoir thickness is small. Research shows that the velocity in sand is little faster than that in surrounding rocks. But the velocity difference between reservoir and mudstone becomes smaller when the reservoir contains hydrocarbon. So it is hard to use the P-wave impedance to identify hydrocarbon reservoirs. This paper attempts from the elastic parameters, and introduces the Poisson impedance. The attribute analysis of Poisson impedance is used to detect the hydrocarbon reservoirs at the first member of Shawan Formation in PX well area. Predicted results coincide with the logging interpretation results of the drilled wells, the distribution characteristics of the favorable hydrocarbon reservoirs at the first member of Shawan Formation are predicted effectively in PX well area. At the same time, the Poisson attribute analysis is confirmed to be an important hydrocarbon detecting method.

10.6056/dkyqt201504013