Page 49 - 《应用声学》2020年第1期

第 39 卷 第 1 期 Vol. 39, No. 1
2020 年 1 月 Journal of Applied Acoustics January, 2020

⋄“全国储层声学与深部钻测技术前沿研讨会”举办十周年 ⋄

页岩可压裂性声学模型及应用 ∗

李 帆 1 巴 晶 1† 符力耘 2 檀文慧 1 于 庭 1 曹青业 1

(1 河海大学 南京 211100)
(2 中国石油大学 (华东) 地球科学与技术学院 青岛 266580)
摘要：页岩气作为一种非常规能源，储量巨大，因此针对页岩储层地质勘探和有效压裂改造的研究具有重大的
意义。常规的脆性模型评价可压裂性通常只考虑单一影响因素，具有一定的工区适用性。该文在弹性参数脆
性评价模型和断裂韧性指标的基础上，提出一种表征页岩可压裂性的声学评价模型。选取渝东南目的层页岩
岩样，通过超声波实验获取相关实验数据，测量岩石参数，得到了目的层储层特征及声学特征变化规律。结合
断裂韧性指标，建立了可压裂性评价模型。通过新评价模型对研究区进行可压裂性反演预测，结果表明储层可
压裂性反演结果与页岩气实际产量具有较好的符合，分析可知，新方法预测或评价效果要优于前人模型，具有
更好的适用性与可靠性。
关键词：页岩储层；弹性参数；可压裂性；脆性；反演
中图法分类号: P313.1 文献标识码: A 文章编号: 1000-310X(2020)01-0045-09
DOI: 10.11684/j.issn.1000-310X.2020.01.006

Acoustic model for shale fracability and related application

LI Fan 1 BA Jing 1 FU Liyun 2 TAN Wenhui 1 YU Ting 1 CAO Qingye 1

(1 Hohai University, Nanjing 211100, China)
(2 School of Geosciences, China University of Petroleum, Qingdao 266580, China)

Abstract: As one type of unconventional energy resources, there are huge reserves of shale gas. It is of great
significance in the studies of geological exploration and effective fracturing for shale gas reservoirs. Fracability
evaluated by the conventional brittle models mainly considers a single influencing factor, which is applicable
in certain related working areas. Based on the elastic parameter brittleness evaluation model and fracture
toughness index, this paper presents an acoustic evaluation model for characterizing the fracability of shale. The
shale rock samples are collected from the target layers in southeast Chongqing, China. Relevant measurement
data and rock physics parameters are obtained by ultrasonic experimental measurements. We obtain the
variation of reservoir characteristics and acoustic characteristics of the target layer. By combining brittleness
index by elastic parameters with fracture toughness index, the fracability evaluation model is established.
Based on the new evaluation model, the fracability prediction is carried out in the study area. The results
show that the inversion results of the reservoirs are in good agreement with the actual gas production report
of shale gas. The analysis shows that the better prediction or evaluation results can be obtained by the new
method than those by the previous models, validating that the new model is more efficient and reliable.
Keywords: Shale reservoir; Elastic parameter; Fracability; Brittle; Inversion

2019-09-18 收稿; 2019-11-28 定稿
江苏省双创计划项目, 江苏特聘教授计划项目, 国家 111 计划培育项目, 中央高校科研业务费项目, 国家科技重大专项 (2017ZX05008-
∗
007)
作者简介: 李帆 (1994– ), 女, 山西晋中人, 硕士研究生, 研究方向: 地球探测与信息技术。
† 通信作者 E-mail: jba@hhu.edu.cn