马东油田沙一段重力流沉积有效储层预测研究

Effective reservoir prediction of gravity flow deposition in Es_1 formation of Madong oilfield

马东油田沙一段发育重力流沉积体系,具有埋藏较深、砂体相互叠置、井间厚度变化大的特点,对储层的识别和追踪非常困难,为此开展了马东油田沙一段有效储层预测技术的研究。针对储集层与围岩的速度差异不明显的问题,利用拟声波反演技术预测有利沉积相带的砂体分布,提高了测井约束反演结果对储集层的识别能力;利用衰减属性分析技术,研究了有利沉积相带内砂岩的含油气性,完成了有效储层展布特征分析。有效储层预测结果与实际钻探情况吻合良好,并指出了有利目标区,为下一步编制开发概念方案提供了重要的依据。

Gravity flow sedimentary system developed in Es_1 formation of Madong oilfield,which is difficult to identify and track the reservoir because of the buried depth,the overlapping of sand bodies,and the variation of well thickness,therefore,the study on the effective reservoir prediction was carried out.Aiming at the unapparent difference between the reservoir and the surrounding rocks,the favorable sedimentary facies belts were predicted by using pseudo acoustic inversion,and the inversion results can effectively predict the reservoir distribution.The oil-gas bearing property in the favorable sedimentary facies belt was analyzed by using the attenuation attribute analysis technique,and then the effective reservoir distribution characteristics were analyzed.The effective reservoir prediction results were in good agreement with the actual drilling situation,which pointed out the favorable target area and provided an important basis for the preparation of the conceptual plan in the next step.