致密砂岩储层可压性评价与极限参数压裂技术

鄂尔多斯盆地陇东元284地区延长组长6段储层孔隙度和渗透率低,储层非均质性强,属于典型的致密砂岩储层。利用单一的脆性指数并不能真实反映储层的可压性。根据储层测井响应特征,确定储层与脆性指数、弹性力学参数之间的关系,并在储层综合可压性评价时引入天然裂缝发育程度、渗透率非均质性和原始压力保持程度参数。提出了基于储层可压性的储层分类方案。采用极限参数压裂技术,针对不同类型的储层,通过物质平衡法确定恢复至原始地层压力所需的入地液量,个性化压裂方式最优化压后产量,达到高产和稳产的目的,该技术已经在元284取得了良好的应用效果,对于未来油气开发具有重要的意义。

Tight sandstone reservoir compressibility evaluation and limit parameter fracturing method

The strongly heterogeneous reservoir of Yanchang Formation in Longdong Yuan 284 area of Ordos Basin is a typical tight reservoir. Using a single brittleness index cannot truly reflect the compressibility of the reservoir. According to the logging response characteristics of the reservoir, this paper studied the relationship between the reservoir and the brittleness index and elastic mechanics parameters, and introduce the development degree of natural fractures, the heterogeneity of permeability and the degree of original pressure retention when evaluating the comprehensive compressibility of the reservoir parameter. A reservoir classification scheme based on reservoir compressibility is proposed. Using extreme parameter fracturing technology, for different types of reservoirs, the material balance method is used to determine the amount of liquid entering the ground required to restore the original formation pressure, and the personalized fracturing method optimizes the post-compression production to achieve high and stable production. This technology has achieved good application results in Yuan 284, which is of great significance for future oil and gas development.