南海珠江口盆地钻井BHT温度校正及现今地温场特征  

Correcting on logging-derived temperatures of the Pearl River Mouth Basin and characteristics of its present temperature field

作　　者：唐晓音[1,2] 黄少鹏[1] 杨树春 姜光政 胡圣标[2] 

机构地区：[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

出　　处：《地球物理学报》2016年第8期2911-2921,共11页Chinese Journal of Geophysics

基　　金：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.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

关 键 词：BHT校正 地温梯度 大地热流 温度 珠江口盆地 

分 类 号：P314[天文地球—固体地球物理学]