密度投影技术在页岩裂缝储层预测中的应用——以渤南洼陷罗家地区沙三段下亚段为例

针对页岩储层预测及描述的难点,采用非高斯信号、非平稳信号、非线性信号和高阶统计量等现代信号分析方法,开发出密度投影技术.该项技术的前提条件是优选能有效表征裂缝储层的分形、伪熵和混沌等地震属性,对多种地震属性表征的有利裂缝储层展布情况进行融合显示,既可避免单一地震属性的多解性,也可以实现“甜点”预测并对储层分类分级进行评价,进一步完善了储层预测技术系列.利用密度投影技术对渤南洼陷罗家地区沙三段下亚段页岩裂缝储层进行预测,将其裂缝储层划分为Ⅰ类储层、Ⅱ类储层和非储层3类,获得较高产能的井均位于有利裂缝储层(Ⅰ类和Ⅱ类储层)发育区,预测结果与实钻结果吻合率较高.

Application of density projection in prediction of fractured shale reservoirs-case study of lower Es3, Luojia region of Bonan sag

With the improvement degree of exploration and the increasing difficulty of development, we need more geophysical techniques than before. In order to solve the difficulty in prediction of fractured shale reservoirs, we develop a new technique named density projection using the method of modern signal analysis. It can not only display many attributes overlay but also avoid the problem of multi-solution. It can further perfect the technology series of reservoir prediction. The technique has been applied in the lower Es3 of Luojia region of Bonan sag of Shengli oilfield, and obtained a good result. It can guide us to understand the distributing of fractured reservoirs and help us to deploy horizontal wells.