宽带约束地震反演在兰尕地区储层预测中的应用

兰尕背斜带处于塔河油田南部,具有发育非背斜圈闭的条件,勘探程度较低,适用于宽带约束地震反演技术进行储层预测.作者介绍了宽带约束稀疏脉冲反演技术的基本原理、实现方法以及反演流程,并在兰尕地区首次利用约束稀疏脉冲反演技术进行了储层预测,反演过程中运用了9口井进行约束.将反演结果与井真实情况相对比,上油组、中油组与钻井、测井解释储层吻合较好,下油组顶面吻合较好,内部及底部与钻井有一定差异.根据反演结果圈定了砂体发育带,确定了岩性圈闭,并最终落实了钻井目标.该方法在勘探程度比较低的地方可以较准确地预测储层岩性和展布规律,对油田的进一步勘探开发,以及降低勘探开发风险有一定的指导意义.

Application of the broadband constrained seismic inversion to the prediction of reservoirs in the Langa region of the Tahe oil field, Xinjiang, China

The anticline belt of the Langa region is located in the south of the Tahe oil field.It bears the condition for developing of non-anticline straps and is suitable for using the broadband seismic inversion technology to predict reservoirs.But the exploration level in this region is low.The authors introduced the fundamental principles,realizations and procedures of the broadband constrained seismic inversion and used this method to predict the reservoirs in the Langa region for the first time.Nine wells were used during the procedure of constrained inversion.The comparison between the inversion results and the drilling outcomes shows that the upper and middle oil sets are consistent well with the drilling and logging explanation reservoir,the top of the lower oil belt agrees well,while the inner and bottom have some differences from the drilling results.The development belts of sand bodies as well as lithologic traps were located and ultimately the drilling targets were pointed out.This method can predict the reservoir lithology and spreading regularity more accurately in such places where the exploration level is low.And it has some guiding significance in further exploring and developing oil fields and lowers the risk of exploration.