陆西凹陷特殊储层地震预测方法探讨

Seismic prediction of special reservoirs in Luxi Depression

 郭彦民 裴家学 赖鹏 冉波 宫振超 殷敬红

 （中国石油辽河油田分公司勘探开发研究院，辽宁 盘锦 124010）

 (Research Institute of Exploration and Development, Liaohe Oilfield Company, PetroChina, Panjin 124010, China)

 陆西凹陷为中生代凹陷，储层类型多样，除常规砂岩储层之外，钻井还揭示了薄层砂岩、凝灰质砂岩和火山岩3类特殊储层。现阶段3类特殊储层均取得较好勘探效果，已成为主要勘探对象。但是利用常规储层预测技术难以准确识别和描述，严重制约该地区的进一步勘探部署和评价研究。基于此，针对不同类型储层的特点、预测难点及对油气成藏的控制因素，采用不同的储层预测技术进行研究。采用拟声波波阻抗反演技术识别九佛堂组上段的薄层砂岩并刻画其空间展布，利用叠前弹性参数反演技术预测九佛堂组下段凝灰质砂岩的“甜点”区，通过叠前、叠后联合裂缝预测技术检测火山岩裂缝发育密度及方向。预测结果与实际钻探结果吻合良好，并指出了有利勘探区，为下步勘探部署提供重要依据。

 Luxi Depression is a Mesozoic Depression which has developed various types of reservoirs. In addition to conventional sandstone reservoir, drilling also reveals three special reservoirs, thin layer sandstone, tuff sandstone and volcanic rock. These three special reservoirs have become the major exploration subjects based on the favorable exploration results. However, due to the difficulties in accurately identifying and describing special reservoirs, conventional reservoir prediction technique seriously restricts exploration deployment and evaluation research in this area. Therefore, different reservoir prediction methods are established according to the features and the prediction difficulties of each reservoir, as well as hydrocarbon accumulation controlling factors. To be exactly, pseudo acoustic wave impedance inversion technique is used to identify thin layer sandstone, the Upper Member of Jiufotang Formation, and depict its spatial distribution. Pre-stack elastic parameter inversion technique is introduced to predict the rich area of tuff sandstone reservoir in the Lower Member of Jiufotang Formation. Moreover, the pre-stack and post-stack fracture prediction technique is taken to detect fracture density and azimuth of volcanic rock. The predictions coincide with the actual drilling results, which point out the favorable exploration area and provide important basis for next exploration deployment.

10.6056/dkyqt201604010