Full
ZHANG Hui,born in 1987,Master,a senior engineer,is engaged in non-seismic geophysical exploration and geothermal geology-related work. E-mail: zhanghui714@126.com.
Outline
Characterizing Lower Paleozoic carbonate thermal reservoirs is essential for evaluating the geothermal resource potential of the eastern margin of the South North China Basin. Integrating findings from prior studies with newly acquired drilling,core,outcrop,and geochemical analytical data,this study systematically characterizes Cambrian and Ordovician thermal reservoirs,delineates their spatial distribution patterns and associated geothermal field attributes,and identifies prospective exploration targets. Key findings are as follows: (1)Lower Paleozoic carbonate thermal reservoirs in the study area are predominantly hosted in the Zhangxia Formation and overlying strata. Reservoir types include oolitic shoal,dolomitic,and karst reservoirs. Late-stage tectonic activity has significantly influenced the oolitic shoal and dolomitic reservoirs,promoting secondary karstification;consequently,well-developed karst reservoirs—predominantly Class II and III fractured systems—are widespread across the region.(2)Karst reservoir distribution exhibits clear structural control,with dominant NW-and NE-trending orientations. In shallow-buried settings,the top of the Cambrian reservoir ranges from 500 to 2500 m depth,whereas the Ordovician reservoir top lies between 100 and 2000 m. Corresponding top-reservoir temperatures range from 30 to 90 ℃.(3)A quantitative evaluation framework for karst reservoir favorability was established,incorporating three key parameters: burial depth,caprock geothermal gradient,and degree of karst development. Application of this framework identifies the western Shangqiu area of the Taikang Uplift as the most prospective zone for karst-hosted geothermal resources—providing a robust scientific basis for prioritizing future geothermal exploration and development efforts in the basin.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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