摘要：The hydraulic fracturing experiments were conducted in the laboratory under true triaxial condition. Based on acoustic emission localization and acoustic emission characteristic parameters, the process of crack propagation in hydraulic fracturing was studied. The results showed that: (1) According to acoustic emission (AE) characteristics, shale hydraulic fracturing process can be divided into three stages: the initial stage, main fracture stage, and volumetric fracture stage. (2) In the initial stage, the pressure is in an upward phase, with a relatively small number of acoustic emissions and large b-values, mainly consisting of compressive and tensile cracks with low frequency, forming dispersed small cracks inside the rock. Before reaching the peak pressure, the cracks will gradually form a main fracture. (3) In the main fracture stage, as the pressure increases until the reservoir fracture pressure is reached, the acoustic emission rate sharply increases, resulting in a large number of high-energy acoustic emission events. The b-value decreases, and the acoustic emission frequency is higher, forming a tensile type main fracture closed to the wellbore hole. (4) In the stage of volumetric fracture, although the pressure significantly decreases, a large number of micro cracks still occur inside the samples. The fractures mainly propagate in a dispersed manner along the main fracture and form a complex network of volumetric fractures. During this stage, the acoustic emission b value is relatively high, with a large number of acoustic emissions of shear type fractures. (5) The AE characteristics of hydraulic fracturing in the laboratory are consistent with the microseismic monitoring results of on-site hydraulic fracturing. After on-site hydraulic fracturing, a large number of microseismic events will also occur during the well closed stage. The results of this study have important guiding significance for on-site hydraulic fracturing. ? 2025 Editorial Office of Chinese Journal of Geophysics. All rights reserved.

ISSN号：0001-5733

卷、期、页：卷68期1：229-243

发表日期：2025-01-01

期刊分区（SCI为中科院分区）：四区

收录情况：SCI（科学引文索引印刷版）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：Acta Geophysica Sinica

参与作者：刘卫华,何吉祥,徐政语,王洋

通讯作者：宋嘉欣,张作冬

第一作者：王小琼,葛洪魁,邹雨时

论文类型：期刊论文

论文概要：王小琼,宋嘉欣,刘卫华,何吉祥,徐政语,张作冬,葛洪魁,邹雨时,王洋，Experimental study on hydraulic fracturing and acoustic emission characteristics of shale，Acta Geophysica Sinica，2025，卷68期1：229-243

论文题目：Experimental study on hydraulic fracturing and acoustic emission characteristics of shale