松辽盆地南部大情字井区青山口组地热水化学特征及成因模式  

Geothermal chemical characteristics and genetic model of the Qingshankou Formation in the Daqingzijing area,southern Songliao Basin

作　　者：杜先利 王泓博 赵容生 季辉 朱焕来[1] 代登亮 王颖[4] 李迎九[4] 肖红平[5] DU Xianli;WANG Hongbo;ZHAO Rongsheng;JI Hui;ZHU Huanlai;DAI Dengliang;WANG Ying;LI Yingjiu;XIAO Hongping(School of Earth Science,Northeast Petroleum University,Daqing Heilongjiang 163318,China;College of Earth Science,Jilin University,Changchun 130061,China;SINOPEC Shengli Oilfield Company Gudong Oil Extraction Plant,Dongying Shandong 257237,China;PetroChina Jilin Oilfield Exploration and Development Research Institute,Songyuan Jilin 138000,China;PetroChina Research Institute of Exploration and Development,Beijing 100083,China)

机构地区：[1]东北石油大学地球科学学院,黑龙江大庆163318 [2]吉林大学地球科学学院,长春130061 [3]中国石油化工集团有限公司胜利油田孤东采油厂,山东东营257237 [4]中国石油吉林油田勘探开发研究院,吉林松原138000 [5]中国石油勘探开发研究院,北京100083

出　　处：《地质科技通报》2024年第3期22-35,共14页Bulletin of Geological Science and Technology

基　　金：中国石油天然气股份有限公司科技项目“松辽盆地低孔低渗地热利用目标优选及关键技术研究”(kt2021-20-01)。

摘　　要：位于长岭凹陷鞍部的大情字井地区水热型地热资源丰富,其中储层温度较高、岩性好、含水量高的青山口组是最佳热储层,因此,阐明地热水的成因模式对于该区地热资源的可持续开发利用具有重要意义。通过青山口组7口井地热水样的水化学测试,结合收集的8组氢氧同位素数据,研究了目标区地热水的来源及混合过程,并分析了成因模式。结果表明,青山口组地热水主要为部分平衡的Cl^(-)Na型流体,补给来源为长白山地区的大气降水和原生沉积水,补给高程为2347~2370 m;通过2210~3470 m的循环吸热过程形成现今温度为81.25~112.80℃的地热流体存储于半开放体系的青山口组碎屑岩储层中。另外,研究区NE、NW向2组断裂系统是地热流体循环的主要导水通道,地热流体在深循环过程中与围岩矿物发生水岩反应,碳酸盐岩及硅酸盐矿物的溶解,形成了以Na^(+)、Cl^(-)和HCO^(-)3离子为主的地热水资源。[Objective]With high reservoir temperature,good lithology and high water content,the Qingshankou Formation is the best geothermal reservoir of Daqingzijing area,the saddle of the Changling Depression.Therefore,elucidating the genetic model of geothermal water is of great significance for the sustainable development and utilization of geothermal resources in this area.[Methods]In this study,the source and mixing process of geothermal water in a target area were studied by hydrochemical testing of geothermal water samples collected from 7 wells in the Qingshankou Formation,combined with 8 groups of hydrogen and oxygen isotope data,and a genetic model was established.[Results]The results show that the geothermal water of the Qingshankou Formation is mainly Cl^(-)Na-type fluid,which is partially balanced.And the geothermal water is originated from the precipitation and primary sedimentary water in the Changbai Mountain area,with recharge elevation of 2347-2370 m.A geothermal fluid with a reservoir temperature of 81.25-112.80℃was formed after the cyclic heat absorption process and was stored in the clastic rock reservoir of the Qingshankou Formation in a semi-open system.[Conclusion]In addition,the northeast-oriented and northwest-oriented fault systems in the study area are the main water conducting channels for geothermal fluid circulation.During the deep circulation,geothermal fluid reactions with surrounding rock minerals,resulting in the dissolution of carbonate and silicate minerals,forming geothermal water resources dominated by Na^(+)、Cl^(-) and HCO^(-)3 ions.

关 键 词：松辽盆地南部 大情字井地区 地热水 水化学特征 成因模式 地热储层 碎屑岩储层 

分 类 号：P314.2[天文地球—固体地球物理学] TK521[天文地球—地球物理学]