Fracture Evaluation by VEP Electrical Resistivity Method

VEP 电阻率法断裂评估

• 批准号: 01550496
• 负责人: USHIJIMA Keisuke
• 金额: $ 0.13万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01550496/
• 关键词: Hot Dry Rock; hole-to-surface survey; hole-to-hole survey; Evaluation of fracture; PC observation; fluid-flow behavior; Hydraulic Fracturing; Real-Time Evaluation; 線電極を用いる流電電位法; 坑井間物理探査法; 水圧破砕実験; パソコンによる観測システム; リアルタイムデ-タ解析; フラクチャ-のモニタリング; 流体

For Hot Dry Rock (HDR) geothermal energy development, it is necessary to establish technologies for creating artificial fractures between injection and production wells as geothermal reservoirs and for evaluating their distribution and flow capacity on the site.In this study, Vertical Electric Profiling (VEP) method using a casing pipe as a current electrode has been conducted for monitoring fluid-flow behaviors during massive hydraulic fracturing operations'on HDR project at Akinomiya by Central Research Institute of Electric Power Industry in Japan. The injected fluid-flow could be continuously detected and monitored with multiple non-polarizing electrodes on the ground surface surrounding the hydraulic fracturing well by the digital recording system controlled by a Personal Computer on the site.The distribution of fractues estimated from the detected flow paths showed good agreements with the geometry of fractures obtained by Borehole Television (BHTV) and Acoustic Emission (AE) survey data.Hole-to-hole (crosshole) survey was also conducted during fracturing operations for locating the major flow paths more accurately with depth.The VEP (hole-to-surface) survey provides lateral distribution of major fractures created by hydraulic fracturing operations, while the crosshole (hole-to-hole) survey gives information about the depths of flow paths connected between injection and production wells on the site.Therefore, we could obtain the fluid-flow paths with time variations and major fractures in three-dimensions by the joint use of hole-to-surface (VEP) and hole-to-hole (geotomography) electrical resistivity surveys with computer cotrolled data acquisition system on the site.

在干热岩地热能源开发中，有必要建立注采井之间人工裂缝作为地热储层的技术，并对其在现场的分布和流量进行评价。在本研究中，日本中央电力工业研究所在秋之宫的HDR项目中，采用套管作为电流电极的垂直电剖面（VEP）方法对大规模水力压裂作业中的流体流动行为进行了监测。通过现场个人计算机控制的数字记录系统，可以通过水力压裂井周围地面上的多个非极化电极连续检测和监测注入流体的流动情况。根据检测到的流道估计的裂缝分布与井眼电视（BHTV）和声发射（AE）调查数据获得的裂缝几何形状吻合良好。在压裂作业期间，还进行了井间测量，以便更准确地定位主要流动路径。VEP（眼对地）测量提供了水力压裂作业产生的主要裂缝的横向分布，而眼对眼（眼对眼）测量提供了现场注入井和生产井之间连接的流动路径深度的信息。因此，在现场利用计算机控制的数据采集系统，联合利用井对地（VEP）和井对地（geotomography）电阻率测量，可以获得随时间变化的流体流动路径和主要裂缝的三维特征。

项目成果

K.Ushijima,H.Mizunaga: "Detection of cavities by the mise-a-la-masse and pole-dipole resistivity surveys" Proco of MMIJ/IMM Joint Sympo.Kyoto,Japan. 125-128 (1989)

K.Ushijima、H.Mizunaga：“通过 mise-a-la-masse 和极偶极电阻率测量检测空洞”Proco of MMIJ/IMM Joint Sympo.Kyoto，日本。

Keisuke USHIJIMA: "Fluid flow monitoring due to hydraulic fracturing by the miseーa^^´ーlaーmeasurements" GRC Transactions. 14. 1249-1252 (1990)

Keisuke USHIJIMA：“通过 miseーa^^´ーlameasurements 进行水力压裂的流体流量监测”GRC Transactions 14. 1249-1252 (1990)。

Ushijima, K.: "Geothermal Exploration in Difficult Areas" Proc. 60th Annual Int. SEG Meeting. 259-261 (1990)

Ushijima, K.：“困难地区的地热勘探”Proc。

Ushijima, K.: "Exploration of geothermal reservoir by the mise-a-la-masse measurement" Geothermal Resources Council Bull.vol. 18, no. 2. 17-25 (1989)

Ushijima, K.：“通过 mise-a-la-masse 测量勘探地热储层”地热资源委员会 Bull.vol。

Ushijima, K.: "Detection of cavities by the mise-ala-masse and pole-dipole resistivity surveys" Proc. MMIJ/IMM Sympo. 125-128 (1990)

Ushijima, K.：“通过 mise-ala-masse 和极-偶极电阻率测量检测空洞”Proc。