Subsurface Fluid Injection and Energy Storage
Open Access

Table 1

Cenozoic strata lithology and fluid production status in Tianjin.

System Formations and thickness Section Lithology Production status
Quaternary Q (–) Mudstone, sandy mudstone, and sandstone Industrial oil flows
Neogene N2 m (600–1000 m) Upper Fine siltstone, sandstone, and mudstone Hot water extraction layer with water flow rates of 40–100 m3/h and T = 40–80 °C
N1 g (300–900 m) N1 g 1 Medium-coarse sandstone interlayered with mudstone Main geothermal reservoir with water extraction rates of 80–130 m3/h and T = 48–82 °C
N1 g 2
N1 g 3
Paleogene E3 d (100–800 m) E3 d 1 Mudstone interlayered with sandstone and gravel-bearing sandstone Wellhead flowing rates of 40–80 m3/h and wellhead flowing T = 78–93 °C
E3 d 2
E3 d 3
Es (800–2100 m) Upper part is mudstone; lower part is mudstone interlayered with limestone, dolomite, shale, and siltstone Industrial oil flows, e.g., Shuguang oilfield
Upper part is sandstone interlayered with mudstone; lower part is carbonaceous shales and sandstones Industrial oil flows, e.g., in Shengli oilfield
Sandstone interlayered with mudstone and oil shale Industrial oil flows, e.g., in Shengli oilfield and Shuguang oilfield
Sandstone interlayered with mudstone and oil shale Industrial oil flows
Ek (250–2500 m) Sandstone, dolomite, mudstone, carboniferous shale, and conglomerate Industrial oil flows

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