基于测井信息的致密油层射孔优化选层方法研究

Optimal Selecting Interval Method of Tight Oil Reservoir Perforating Based on Well Logging Information

致密油层的低孔隙度、低渗透率和低压力特征使优化射孔工艺变得困难,其中一个问题就是要解决在单井剖面上自动快速确定优先射开层位。测井资料包含丰富的储层岩性、物性和含油性及脆性等信息,可利用测井曲线进行自动优化射孔选层。通过综合考虑储层地质和力学信息,构建优化选择射孔层位的评价指标函数,逐点逐层计算该函数值,据其从大到小的顺序优选射孔层段和位置。将该方法应用于鄂尔多斯盆地延长组长6—长8段致密油层的优化射孔实践中,效果明显,值得推广应用。

Perforating technology plays an important role in the reformation of tight oil reservoirs. It has become inevitable to explore the key technology of efficient development of tight oil reseroirs perforation and fracture. The three low characteristics of tight oil reservoirs make it difficult to optimize the perforation process, and one of the problems is how to automatically and quickly determine the priority to perforating layer and position of the single well profile. Log data contains abundant reservoir lithology, physical property and oiliness and brittleness and other informations. Selecting layer can be automatically optimized by logging curves. Based on the comprehensive consideration of reservoir geological and mechanical quality information, this paper constructs the evaluation index function of optimizing perforation layer and position, and calculates the value of the function by point and layer to optimize perforation layer and position in term of the value. This method and programs are used for tight oil reservoirs perforation optimization of Chang6--Chang8 reservoirs in Ordos basin, the effect is better.