Table 3.

Summary of studies reporting the detection of alkylsuccinates [and/or alkylsuccinate synthase (assA) gene] in fossil energy reservoir samples.

Field location	Field details	Electron accepting condition(s)	Alkylsuccinates (and/or assA gene detected)	References
Alaska North Slope, USA	High temperature oilfield (50–60°C)	Sulfate-reducing, methanogenic	Saturated: C1–C4	Duncan et al., 2009
Alaska North Slope, USA	High temperature oilfield (50–60°C)	Primarily sulfate-reducing	Saturated: C1–C3	Gieg et al., 2010
Alaska North Slope, USA	High temperature oilfield (50–60°C)	Primarily methanogenic	Saturated: C1–C3	Gieg et al., 2010
SE Alberta, Canada	Low temperature oilfield (~30°C); oil produced via PWRI1, nitrate treatment for souring	Nitrate-reducing, sulfate-reducing, methanogenic	Saturated: C6–C8 Unsaturated: C6–C8	Agrawal et al., 2012
Huabei Oilfield, China	Low temperature oilfield (37°C)	Not reported but incubations prepared with nitrate, sulfate, and under methanogenic conditions	assA gene detected in methanogenic incubations from production waters	Li et al., 2012
Shengli Oilfield, China	High temperature oilfield (70°C)	Not reported but incubations prepared under methanogenic conditions	assA gene detected in methanogenic incubations (55°C) from production waters	Zhou et al., 2012
Shengli Oilfield, China	High temperature oilfield (70°C)	Not reported but incubations prepared under methanogenic conditions	assA gene detected in methanogenic hexadecane-degrading enrichment	Cheng et al., 2013
San Juan Basin (Fruitland Coal Formation, CO and NM), USA	Coal bed methane site	Methanogenic	Saturated: C1–C3, C8 Unsaturated: C7–C8 assA gene detected	Wawrik et al., 2012

¹PWRI, Produced water re-injection.