金春爽^1,2,,
付修根³,
陈文彬³,
乔德武⁴,
葛佳¹,
祝有海^1,2,
卢振权^1,2,
王平康¹
1. 中国地质调查局油气资源调查中心, 北京 100083
2. 中国地质调查局 非常规油气地质重点实验室, 北京 100083
3. 中国地质调查局成都地质调查中心, 成都 610081
4. 国土资源部油气资源战略研究中心, 北京 100034

基金项目: 天然气水合物勘查与试采专项项目（GZHL20110309）和南方地区1:5万页岩气基础地质调查填图试点项目（DD20160182）联合资助


详细信息

作者简介: 金春爽, 女, 1974年生, 博士, 教授级高工, 2002年毕业于中国科学院地质与地球物理研究所, 现从事页岩气、天然气水合物地质调查和研究工作.E-mail:jincs2002@163.com

中图分类号: P314

收稿日期:2018-07-23
修回日期:2019-05-11
上线日期:2019-08-05

Measurements of borehole heat flow in northern Tibet

JIN ChunShuang^1,2,,
FU XiuGen³,
CHEN WenBin³,
QIAO DeWu⁴,
GE Jia¹,
ZHU YouHai^1,2,
LU ZhenQuan^1,2,
WANG PingKang¹
1. Oil and Gas Survey, China Geological Survey, Beijing 100083, China
2. Key Laboratory of Unconventional Oil and Gas Geology, China Geological Survey, Beijing 100083, China
3. Chengdu Geological Survey Center, China Geological Survey, Chengdu 610081, China
4. Strategic Research Center for Oil and Gas Resources, MLR, Beijing 100034, China


MSC: P314

--> Received Date: 23 July 2018
Revised Date: 11 May 2019
Available Online: 05 August 2019


摘要
摘要:本文利用藏北地区三口天然气水合物钻孔测温数据，在分析样品热导率测试结果基础上，计算了藏北地区的热流值.对于样品热导率值，首先根据样品孔隙度对实验室测试结果进行了饱水校正，计算热流时采用的是对应井段的岩石热导率饱水校正值的厚度加权平均值.地温梯度以三口钻孔48 h的测温数据为基础，回归三口井的地温梯度，计算时去除了浅部受地表温度和冻土带对温度影响的数值.A钻孔地温梯度分为200~438 m和438~882 m两段回归，分段热流的加权平均值作为钻孔热流值，计算结果为42.7 mW·m^-2；B钻孔和C钻孔回归地温梯度时未分段，热流计算结果分别为58.3 mW·m^-2、70 mW·m^-2.综合分析认为，岩石圈断裂、地幔上涌、碰撞造山过程中的剪切生热等因素可能造成了班公湖—怒江缝合带以南热流值较高，而北部羌塘地块热流值相对较低.
关键词: 藏北地区/
钻孔/
热流/
热导率/
地温梯度

Abstract:The heat flow values of northern Tibet were calculated based on three gas hydrate wells' temperature logs and core thermal conductivity analysis. Laboratory thermal conductivity test results were first calibrated by using associated core porosity and a 100% water-saturated model, then the arithmetic average thermal conductivity was determined from the corrected values, which were weighted by a factor proportional to the interval thickness. Geothermal gradients were from the linear regression analysis of the borehole temperature data, which was logged within 48 hours after TD. The shallow interval temperature data was filtered out to avoid the impact of ground temperature and permafrost. Two different geothermal gradients were derived from well A. A weighted average of the two zones for well A resulted in a heat flow value of 42.7 mW·m^-2. Well B and well C only had one geothermal gradient. Heat flow values of 58.3 mW·m^-2 and 70 mW·m^-2 were calculated for well B and well C, respectively. Some factors, such as crustal faults, mantle upwelling and shear heat from overthrust terrains, may lead to higher heat flow values in the south of Bangong Co-Nujiang suture zone. Conversely, the heat flow value is relatively low in the north of the suture zone.
Key words:Northern Tibet/
Borehole/
Heat flow/
Thermal conductivity/
Geothermal gradient



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