塔河油田SD地区石炭系卡拉沙依组薄砂体预测

Prediction of sand bodies in thin reservoirs of Carboniferous Karashayi formation in SD area, Tahe oilfield

（成都理工大学数学地质四川省重点实验室，四川成都610059）

Sichuan Key Laboratory of Mathematics Geology, Chengdu University of Technology; Chengdu 610059, China

塔河油田石炭系卡拉沙依组砂体的埋藏深度一般小于5000m，厚度一般小于10m，且横向变化较大，地震资料不能区分砂泥岩，因此储层描述困难。针对这些特点，探讨了卡拉沙依组薄砂体的预测方法。从井震关系研究出发，利用岩石物理参数，优选对薄砂体敏感的参数；通过试验分析对比，优选以自然电位反演方法为主的储层预测技术，提出了针对石炭系卡拉沙依组薄砂体的预测方法；在SD地区利用该预测方法进行了砂体展布描述，并预测了有利储集体，后得到了钻井证实。

The sand bodies of Carboniferous Karashayi formation in Tahe oil field are usually buried below 5000m, with a thickness of less than 10m and a big lateral change. The resolution of seismic data can not differentiate sandstone from mudstone, making it difficult for reservoir description. Aiming at this problem, we discussed the prediction method for sand bodies of Carboniferous Karashayi formation. Started from well-seismic relation research, the physical properties of rock are used to optimize sensitive parameters of thin sand bodies. After experimental analysis and comparison, natural potential inversion method is selected as the main reservoir technology, and the prediction method of thin sand bodies in the area was established. The prediction method was used to describe the sand distribution in SD area and to predict favorable accumulating units, which was proved true by drilling.