基于相控的反演在薄储层预测中的应用

Application of Phase-Controlled Inversion to Thin Reservoir Prediction

摘要: 塔河油田卡拉沙依组埋藏深大、储层薄，砂泥岩波阻抗区分困难，传统的反演方法无法满足勘探的需求。地震波形指示反演是一种从三维地震资料出发，在沉积规律的约束下，通过查找相同沉积环境下的测井曲线中包含的相似特征，对有限的地震先验样本点开展模拟的反演方法。通过对测井曲线分析，寻找可以有效区分岩性的曲线，使用基于相控的反演方法，提高了薄储层的识别精度，反演结果与井上稳合率较高。并在等时地层切片技术的辅助下，实现了对研究区薄砂层的平面展布描述，符合地质规律。该方法充分体现了相控反演的思想，为岩性油气藏精细勘探、薄储层预测等难点提供了一种新的方法。

Abstract: The Carboniferous Karashayi Formation of the Tahe oilfield is characteristic of deeply buried reservoir and thin reservoir. It is difficult to distinguish the impedances of sandstone and mud-stone. The traditional inversion can’t meet the needs of exploration. Seismic waveform indicat-ing inversion is a method which mining common structural information contained in logging curves of the same sedimentary environment from seismic by under the guidance of sedimenta-ry, simulate finite sample point of seismic. The prediction accuracy of thin sand layer is im-proved by seismic waveform indicating inversion using optimization of lithology sensitive curve. The coincidence rate of inversion and participating well is high, and the rate of inversion and post inspection well is also very high. With the aid of isochronous stratigraphic slicing technol-ogy, the plane distribution description of the thin sand layer in this area is realized, which con-forms to the geological law. This method fully embodies the idea of phase controlled inversion, and provides a new method for fine exploration and thin reservoir prediction of lithologic re-servoirs.