Table 2.

Quantification of microorganisms in drilling waters and drilling muds

Well	No./ml of water or no./g of mud detected in:
	Drilling waters				Drilling muds
	Aerobic heterotrophs	Acid producers	Sulfate reducers	qPCRa	Aerobic heterotrophs	Acid producers	Sulfate reducers	qPCR
GA	2.3 × 102	2.3 × 100	NDb	8.39 × 105	9.2 × 104	2.3 × 103	2.3 × 101	5.52 × 107
GRT	4.2 × 101	2.3 × 100	ND	Not done	2.4 × 107	9.2 × 103	>1.1 × 106	2.87 × 107
SM	2.3 × 102	9.2 × 100	ND	2.07 × 103	2.3 × 105	2.3 × 101	2.3 × 103	2.54 × 106
AJT	1.5 × 100	ND	ND	2.16 × 104	2.3 × 106	4.3 × 104	>1.1 × 106	4.58 × 105
AI	9.2 × 101	1.5 × 100	4.2 × 101	1.07 × 103	2.3 × 106	2.3 × 101	1.5 × 102	2.13 × 106
BY	0.92 × 100	ND	ND	6.04 × 106	9.2 × 104	4.3 × 104	2.3 × 101	3.43 × 107
RE	4.2 × 101	9.2 × 100	ND	6.03 × 104	2.3 × 105	9.3 × 104	ND	7.13 × 106

^aqPCR values are average of duplicates.

^bND, not detected.