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大牛地气田二叠系下石盒子组盒3段气藏是典型的岩性气藏,其高效开发的关键是储层预测和储层含气性检测。目前常用的地震解释方法能比较精确地预测砂体分布,但对砂体的含气性预测则缺少有效的手段。针对该问题,从主河道发育区是盒3段高产区这一地质认识出发,以“现象—研究—总结”的思路,利用波动方程正演模拟和完钻井产能统计的方法探讨了利用反射模式识别主河道的可能性和可行性,总结并提出了河道下切式地质模型,间接实现了对盒3段主河道成因的高产区预测,实钻显示符合率在90%以上。
The Block 3 reservoir of Permian Lower Shihezi Formation in Daniudi Gas Field is a typical lithologic gas reservoir. The key to its efficient development is reservoir prediction and reservoir gas detection. The commonly used seismic interpretation method can predict the distribution of sand body more accurately, but there is no effective method to predict the gas-bearing of sand body. In view of this problem, starting from the geological cognition of the main riverine development zone, which is the high yielding area of Box 3, using the method of “phenomenon-research-summary” and using the forward modeling of wave equation and the statistics of drilling productivity, The possibility and feasibility of identifying the main channel with reflection mode are summarized and proposed. The geological model of river channel undercut is proposed and the prediction of high production area of the main channel of Box 3 is realized indirectly. The actual drilling shows that the coincidence rate is over 90%.