<![CDATA[An iniportant factor affecting the success of a water flood project for secondary recov-ery is the quality of the water being injected. In this research, the water quality tests werefocused on determination of total bacteria counts of the analy.ed injection water sampleusing ASTM D 5465-93 and selections of injection water quality rating chart for waterflood needs in Sumatra oil fields. The results of microbiological laboratory tests of allanalyzed injection water samples showed three parts. An injection water sample of N - 82containing type of bacteria Bacillus sp with the total bacteria counts 5.02 x 10° colonies/ccwas categorized as no. 1 water quality rating chart. Subsequently, G - GS injection -watersample indicated Bacillus sp with total bacteria counts 4.28 x 10‘ colonies/cc and BacillusLaterosporous with total bacteria count 3.31 x 101 colonies/cc for G - 90 water sample.Two samples mentioned above were classified as no. 2 water quality rating chart. Next,Bacillus Alvei was found in T - 21 injection water sample with total bacteria count 1.85 x102 colonies/cc and Bacillus Pathothenticus in T - GS injection water samples with totalbacteria count 2.61 x 102 colonies/cc. Position of water quality rating chart for both lastsamples were no. 3. These results gave valuable and useful Information before implementa-tion of water flood in the oilfield. Key words: Total bacteria count, bacteria type and injection water quality rating chart]]>
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