Title:

The Formation Conditions and Enrichment Regularity of Buried Hill Karst Geothermal Resources in Bohai Bay Basin

Authors:

LI Pengwei, HE Zhiliang, ZHANG Ying, HU Zongquan, FENG Jianyun, SUN Jiefu

Key Words:

buried hill karstification, geothermal resources, enrichment regularity, Baihai Bay Basin

Conference:

Stanford Geothermal Workshop

Year:

2016

Session:

Geology

Language:

English

Paper Number:

Li1

File Size:

1997 KB

View File:

Abstract:

A series of problems such as "there is heat but no water" or "there is water but no heat" were encountered during the process of karst geothermal drilling in the eastern part of China (the heat here means the temperature meets the requirement of industry), suggesting that it is not an effective exploration method to look for karst geothermal resources only in geothermal anomaly area or karst reservoir development area. Geothermal anomaly together with the development of karst reservoir determines the formation of karst geothermal resources and their distribution. In order to accurately obtain karst geothermal resources, it is supposed to find the "geothermal desserts" where there are both heat and water. In this paper, based on the influencing factors of geothermal anomaly and karst reservoir development condition, the buried karst geothermal formation conditions and enrichment regularity in Bohai bay basin are discussed by comprehensively considering the heat tectonic setting, bedrock buried hill structure, thermal conductivity of rock and groundwater activity, sedimentary and diagenetic factors. The results show that the Cenozoic tectonic evolution in Bohai bay basin provides a relatively high thermal background for the region, and the bedrock buried hill structure, thermal conductivity of rock and groundwater activity are the important factors affecting the shallow geothermal anomaly, and the thick carbonate sedimentary and karstification provide favorable conditions for the karst reservoir formation, and the effective matching of the above various factors become the key to the formation of karst geothermal resources. Overall, surrounding Bohai Bay basin is characterized by low geothermal features due to the downward cold water supply, except for local geothermal anomaly areas due to upward geothermal hot water along certain faults; whereas in the inner part of the basin karst geothermal resources tend to enrich in the bedrock uplift or convex area, especially the areas directly covered by Tertiary strata.


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