珠江口盆地珠一坳陷地温场特征与主控因素分析

黄玉平 ,  龙祖烈 ,  石创 ,  史玉玲 ,  张小龙 ,  胡杰 ,  郑立庆 ,  蔡俊杰

成都理工大学学报(自然科学版) ›› 2026, Vol. 53 ›› Issue (3) : 584 -596.

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成都理工大学学报(自然科学版) ›› 2026, Vol. 53 ›› Issue (3) : 584 -596. DOI: 10.12474/cdlgzrkx.2025072203

珠江口盆地珠一坳陷地温场特征与主控因素分析

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The characteristics of the geothermal field and main controlling factors of the Zhu I Depression in the Pearl River Mouth Basin

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摘要

地温场研究是油气成烃、成藏及资源评价工作的重要基础,因此作为珠江口盆地原油勘探核心区域的珠一坳陷,其地温场研究意义重大。为了精细研究珠一坳陷现今地温场特征及其主控因素,本研究采用多维度数据采集与分析相结合的方法,系统整理了珠一坳陷 204 口探井地温数据,应用光学扫描热导率测试仪开展 211 块样品岩石热导率测试,基于上述参数计算珠一坳陷现今的地温梯度与大地热流。研究结果显示:珠一坳陷地温梯度主要分布在 27~40 ℃/km,平均为 (33±2) ℃/km;岩石热导率值主体分布在 1.0 ~3.0 W/(m •k),平均值为 2.61 W/(m •k);大地热流分布在 55 ~75 mW•m−2,平均值为 64 mW•m−2。分析表明:(1)珠一坳陷地温梯度整体呈现出东高西低、北高南低、凸起区高于凹陷区的特点,不同凹陷之间的地温梯度存在一定差异,其中西江主洼的地温梯度最低,大地热流的分布差异与地温梯度具有耦合性;(2)与其他盆地相比,珠一坳陷属于“热盆”,其热流值高于中国西部的塔里木盆地和准噶尔盆地,低于南海北部的莺歌海盆地和琼东南盆地;(3)珠一坳陷现今地温场的差异分布主要受深部岩石圈热结构、断裂、岩浆岩分布及岩石热物性共同影响。本次研究能够有效指导珠一坳陷深层油气勘探部署、助力烃源岩成熟度评价、油气成藏有利区预测等工作,为珠江口盆地油气资源的勘探开发提供科学依据。

Abstract

Studying geothermal fields provides information related to hydrocarbon generation, petroleum entrapment, and resource assessment. As a core area for crude oil exploration in the Pearl River Mouth Basin, studies of the current geothermal field and its main controlling factors in the Zhu I Depression hold significant importance. To conduct such an in-depth study, we adopted a method that combines multidimensional data collection and analysis. Based on 204 borehole temperature measurements and more than 211 thermal physical parameters, we studied the current geothermal gradient and heat flow, regional geological characteristics, and distribution characteristics of the Zhu I Depression. The results show that the geothermal gradient of the Zhu I Depression is mainly between 27–40 ℃/km, with an average of (33±2) ℃/km; the rock thermal conductivity is between 1.0 and 3.0 W/(m•k), with an average of 2.61 W/(m•k); and the current heat flow is between 55 to 75 mW/m 2, with an average of 64 mW/m 2. Our research indicates that the geothermal gradient of the Zhu I Depression is higher in the east and lower in the west, high in the north and low in the south, and high in uplift areas and low in depression areas. There are certain differences in geothermal gradients between different depressions, among which the geothermal gradient of the main Xijiang Sag is the lowest. The different distributions of terrestrial heat flow are coupled with the geothermal gradient. These new data confirm that the Zhu I Depression has a relatively high heat flow, which is higher than those measured in western China, such as the Tarim Basin and Junggar Basin; however, it is lower than that of the northern South China Sea, such as the Yinggehai Basin and Qiongdongnan Basin. The distribution characteristics of the current geothermal field in the Zhu I Depression are mainly controlled by the deep lithospheric thermal structure, faults, magmatic rock distribution, and its thermal and physical parameters. This study effectively promotes deep oil and gas exploration in the Zhu-1 Depression, facilitating future work related to hydrocarbon source rock maturity evaluation and favorable oil-gas reservoir formation area predictions, and provides a scientific basis for the exploration and development of oil and gas resources in the Pearl River Mouth Basin.

关键词

珠江口盆地 / 珠一坳陷 / 地温梯度 / 热导率 / 大地热流

Key words

Pearl River Mouth Basin / Zhu I Depression / geothermal gradient / thermal conductivity / heat flows

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黄玉平,龙祖烈,石创,史玉玲,张小龙,胡杰,郑立庆,蔡俊杰. 珠江口盆地珠一坳陷地温场特征与主控因素分析[J]. 成都理工大学学报(自然科学版), 2026, 53(3): 584-596 DOI:10.12474/cdlgzrkx.2025072203

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基金资助

“十四五”全国油气资源评价项目(QGYQZYPJ2022-3)

中海石油(中国)有限公司深圳分公司重大生产性科研项目(SCKY-2025-SZ-YJYKT-03)

国家自然科学基金(42302342)

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