| 南海珠江口盆地钻井BHT温度校正及现今地温场特征 |
| |
| 引用本文： | 唐晓音,黄少鹏,杨树春,姜光政,胡圣标.南海珠江口盆地钻井BHT温度校正及现今地温场特征[J].地球物理学报,2016,59(8):2911-2921. |
| |
| 作者姓名： | 唐晓音 黄少鹏 杨树春 姜光政 胡圣标 |
| |
| 作者单位： | 1. 西安交通大学人居环境与建筑工程学院, 西安 710049;2. 岩石圈演化国家重点实验室, 中国科学院地质与地球物理研究所, 北京 100029;3. 中海油研究总院, 北京 100027 |
| |
| 基金项目： | 国家科技重大专项“海洋深水区油气勘探关键技术（二期）”子课题（2011ZX05025-006-05）资助. |
| |
| 摘 要： | 温度是盆地现今地温场研究最重要的基础参数之一,针对钻井井底温度(BHT)一般低于地层真实温度的情况,本文对珠江口盆地16口钻井的BHT数据进行了校正,并根据校正后的温度数据采用最小二乘法新增计算了16个地温梯度及大地热流数据.结合前人发表数据,本文绘制了珠江口盆地最新地温梯度等值线图及大地热流等值线图.除此之外,系统收集整理了盆地钻井大地热流、生热率以及热导率等参数,利用一维热传导方程计算了盆地1~5km深度处的温度,并绘制了盆地深部温度等值线图.在此基础上,分析了盆地现今地温场特征及其成因,以期为珠江口盆地地球动力学背景研究及油气资源评价与勘探提供地热学参数.
|
| 关 键 词： | BHT校正 地温梯度 大地热流 温度 珠江口盆地 |
| 收稿时间： | 2015-08-18 |
Correcting on logging-derived temperatures of the Pearl River Mouth Basin and characteristics of its present temperature field |
| |
| TANG Xiao-Yin,HUANG Shao-Peng,YANG Shu-Chun,JIANG Guang-Zheng,HU Sheng-Biao.Correcting on logging-derived temperatures of the Pearl River Mouth Basin and characteristics of its present temperature field[J].Chinese Journal of Geophysics,2016,59(8):2911-2921. |
| |
| Authors: | TANG Xiao-Yin HUANG Shao-Peng YANG Shu-Chun JIANG Guang-Zheng HU Sheng-Biao |
| |
| Institution: | 1. School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, China;2. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;3. CNOOC Research Center, Beijing 100027, China |
| |
| Abstract: | Temperature data is one of the most important parameters in the present geothermal field research of basin, which includes the analysis of deep temperature, thermal gradient, heat flow. Temperature data commonly derived from continuous logging, drill stem test temperature (DST), bottom hole temperature (BHT) and so on. BHT, which is always lower than the real strata temperature, should be corrected before utilization in the present geothermal field research. In this paper, we are aiming to correct the BHT data of the Pearl River Mouth Basin and calculate new geothermal gradient data as well as new heat flow data. In combination with the previous data and parameters, we will estimate the temperature at the depth at 1 km, 2 km, 3 km, 4 km and 5 km, depict the counter map of geothermal gradient, heat flow and temperature, and further analyze the characteristics and genesis of the present geothermal field, hoping to provide the basic geothermal parameters for geodynamic research and hydrocarbon resources estimation and exploration of the Pearl River Mouth Basin.In this paper, two correct methods that is the Horner-plot method and the Waples method have been chosen for BHT correction. The new thermal gradient data have been calculated by the least square fitting based on the corrected BHT data, and the deep temperature have been acquired by the 1-D heat conduction equation. Thermal gradient of the Pearl River Mouth Basin ranges from 24.7℃/km to 60.8℃/km, with the average value of 37.87±7.35℃/km, and the heat flow ranges from 24.2 to 121.0 mW·m-2, with the average value of 71.5±13.4 mW·m-2. The temperature at the depth of 1 km, 2 km, 3 km, 4 km, 5 km ranges during 22.2~70.4℃, 43.6~117.4℃, 64.4~164.0℃, 84.4~209.9℃, and 103.7℃~254.9℃, respectively, and with the average value of 46.5±7.9℃, 78.3±10.9℃, 109.5±15.6℃, 139.8±20.7℃, and 169.6±26.2℃, respectively.After comparison between the corrected BHT with the DST data, we found that the corrected BHT data by the Horner Plot is still much lower than the DST data, while the data corrected by the Waples method is very close to the DST data; From the view of the geothermal gradient and heat flow, the Pearl River Mouth Basin belongs to the classical "hot basin"; The counter maps of the geothermal gradient, heat flow and deep temperature generally show the increase trend from the shelf area to the slop area, but display two abnormal areas with high value, that is the Shunde sub-sag and the Yangjiang sub-sag; The overall characteristics of the present geothermal field of the Pearl River Mouth Basin is under the control of geology background. The increase trend is in consistence with the decrease trend of the crust thickness of this basin, and the high value of the Shunde sub-sag is likely to be caused by igneous activities while the high value of the Yangjiang sub-sag might be the result of fault activities. |
| |
| Keywords: | BHT correction Geothermal gradient Heat flow Temperature Pearl River Mouth Basin |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《地球物理学报》浏览原始摘要信息 |
| 点击此处可从《地球物理学报》下载免费的PDF全文 |
|
