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To quantitatively characterize the preservation conditions of shale gas in different wells, the formation water and gas composition characteristics of five wells (YC1, YY6, YY1, YK1, and QQ1) in southeastern Chongqing were analyzed. The formation water type of QQ1 and YK1 is CaCl 2 , and CY1 includes CaCl 2  and NaHCO 3  types. The C Na/Cl  and C d  are low, while C Ca/Mg  and C Cl/Mg  are high, indicating that the retention degree of formation water is high. The formation water of YY6 and YY1 is NaHCO 3  type, the C Na/Cl  and C d  are high, while the C Ca/Mg  and C Cl/Mg  are low, indicating the strong connectivity of formation water. The N 2  content of wells QQ1 and YK1 is below 32%, and  15 N is between −7.33‰ and −1.98‰, the source of nitrogen is ammoniated in the process of organic matter pyrolysis and hydrocarbon generation, and the preservation conditions are relatively good. Therefore, the preservation conditions combined with the metamorphic degree of formation water and gas composition can be judged.

petroleum science and technology

Shale gas preservation conditions of Lower Paleozoic Niutitang formation in southeastern Chongqing, China: Evidence from formation water and shale gas components