河南省上蔡县地热系统成因模式及开发潜力

Geological genesis and development potential of geothermal system in Shangcai County, Henan Province

摘要

河南省上蔡县地热系统是典型的水热型地热系统。根据地质调查、地震、钻测井资料及地球化学数据，研究上蔡县地热系统地热地质特征，建立地热系统成因模式，评价地热资源开发潜力，明确地热勘探开发有利区。结果表明：上蔡县地热系统是典型的中-低温传导型地热系统，局部断裂发育，大地热流和地温梯度高于区域背景；发育新近系、古近系和寒武系一奥陶系三套热储层，第四系厚层泥岩为区域性盖层；地热水来源为遂平一带低山丘陵地区的大气降水，沿不整合面人渗，在循环过程中，经深部地幔热传导增温在热储层中富集；热储层总静态资源量约为 3.77×10¹³ kJ ，水量为 6.42×10⁸ m³ ，折合标准煤为 1.29×10⁶t ，可满足 6.71×10⁵ m² 的供暖面积需求，上蔡县城区为勘探开发有利区。该结果为河南省上蔡县及邻区的地热资源开发提供指导。

Abstract

Shangcai County, Henan Province is a typical hydrothermal system in the sedimentary basin. Based on comprehensive geological surveys, seismic, drilling, logging data and geochemical data, a comprehensive study of the geothermal geological characteristics of the geothermal system in Shangcai County will be conducted. The geothermal geological elements were systematically analyzed, and the geothermal geological characteristics, genetic geological models, and resource potential were basically clarified. It is considered that Shangcai County is a typical medium-low temperature conductive geothermal system with developed faults and high geothermal background; There are developing three sets of thermal reservoirs in the Neogene, Paleogene, and Cambrian Ordovician systems with thick mudstone layers in the Quaternary system serving as regional cap rocks; This system recharge water source comes from the atmospheric precipitation in the low mountain and hilly areas of Suiping, and its migration channels are un-conformity surface. During the circulation process, the water gradually enriched in the thermal reservoir; According to the fine evaluation results of geothermal resources in Shangcai Area, the total geothermal reserves amount to 3.77×10¹³ kJ, with a water volume of 6.42×10⁸ m³, equivalent to 1.29×10⁶t of standard coal, and the annual exploitation of geothermal resources can meet the indoor heating area of 6.71×10⁵ million square meters. Comprehensive analysis shows that the urban area of Shangcai County is a favorable area for exploration and development. The study is of theoretical guiding significance for the development of geothermal resources in Shangcai County and its neighboring area.

关键词

地热系统 / 成因模式 / 开发潜力 / 资源量评价 / 上蔡县

Key words

geothermal system / genetic model / develop potential / resources evaluation / Shangcai County

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基金资助

中国石油西南油气田分公司项目(XNS-JS2024-02)