深层地热花岗岩体地震波数值模拟及传播机制  

Numerical simulation of seismic wave in deep geothermal rock mass

作　　者：黄建平[1] 刘英辉 李伟 张盟勃[3] 王扬州 杨永红[5] HUANG Jianping;LIU Yinghui;LI Wei;ZHANG Mengbo;WANG Yangzhou;YANG Yonghong(School of Geosciences in China University of Petroleum(East China),Qingdao 266580,China;Shandong Energy Group,Jinan 250101,China;PetroChina Changqing Oilfield,Xi an 710018,China;Shandong Energy Group South America Company Limited,Qingdao 266000,China;SINOPEC Shengli Oilfield Exploration and Development Research Institute,Dongying 257029,China)

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]山东能源集团,山东济南250101 [3]中国石油长庆油田公司,陕西西安710018 [4]山东能源集团南美有限公司,山东青岛266000 [5]中国石化胜利油田勘探开发研究院,山东东营257029

出　　处：《中国石油大学学报（自然科学版）》2024年第1期63-69,共7页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：山东能源集团深层高温地热重大科技项目(SNKJ2022A06-R23);山东省海洋科技基金青岛海洋科学与技术国家试点实验室项目(2021QNLM020001);创新研究群体项目(41821002);国家自然科学基金优秀青年项目(海外)(ZX20230152);中国石油重大科技专项(ZD2019-183-003);长庆油田勘探开发研究院2023年项目(2023-10502)。

摘　　要：深层地热资源是一种可再生的、蕴藏巨大能量的清洁能源,但其地球物理响应特征不明确,中深层地热探测成功率较低。为了研究地震波在深层地热岩体中的传播规律与波场特征,建立两种深层地热花岗岩模型,并使用等效交错网格有限差分法实现声波与弹性波的数值模拟。结果表明:地热花岗岩体速度在温度的影响下要高于围岩的,会产生高速屏蔽现象,使得透射波能量变弱,限制了地热岩体下部地震波传播能量;相比于声波,弹性波具有更丰富的波场信息,波型与能量转换使得弹性波地震记录也比声波地震记录复杂。Deep geothermal resources represent a substantial form of renewable and clean energy.However,their geophysical response characteristics remain poorly understood,leading to a low success rate in exploring these resources.This study aims to investigate the propagation theory and wavefield characteristics of seismic waves within deep geothermal rock masses.To achieve this,two deep geothermal granite models were established,and numerical simulations of acoustic and elastic waves were implemented using the equivalent staggered grid finite difference method.The numerical simulation results reveal that the velocity of geothermal granite is much higher than that of surrounding rock due to temperature influences,which results in a phenomenon known as high-speed shielding and weakens the transmitted wave energy,consequently limiting the propagation of seismic waves within the lower part of the geothermal rock mass.In addition,compared with acoustic waves,elastic waves offer richer information about the wavefield.The conversion of wave mode and energy makes seismic records of elastic waves more complex than acoustic waves.

关 键 词：深层地热岩 地震波传播机制 数值模拟 有限差分模拟 

分 类 号：P631.4[天文地球—地质矿产勘探]