港西油田北3区块本源微生物驱油潜力研究

Potential of indigenous microbial enhanced oil recovery in N3 block of Gangxi oilfield

通过分析港西油田北3区块油藏物理化学条件、地层水中微生物种群的组成、硫酸盐还原作用和产甲烷作用的速率,以研究该区块采用本源微生物驱油的潜力。结果表明,港西油田北3区块含有多种微生物群落,包括产生表面活性剂的烃氧化菌,利用糖产生气体、酸、溶剂和生物聚合物的厌氧发酵菌和产生甲烷的产甲烷菌。通过本源菌作用原油前后的红外光谱结果分析,原油中芳烃结构变化明显。综合微生物学、油藏条件研究结果,通过激活地层烃氧化菌、发酵菌和产甲烷菌的本源微生物驱提高原油采收率技术在该区块是可行的。

Potential of indigenous microbial enhanced oil recovery in N3 block of Gangxi oilfield is studied through analyzing the physico - chemical conditions, microbial populations, sulfate reduction and rate of methanogenesis in formation water. N3 block of Gangxi oilfield have various microbial populations, such as hydrocarbon - oxidizing bacteria that produce surfactants, anaerobic fermentative bacteria that generate gas, acid, solvent and biopolymer and methanogens that produce methane. Infrared spec-troscopy that are performed before and after indigenousbacteria acting on crude oil show that the structures of aromatic hydrocarbons in crude oil change greatly. Based on the comprehensive study results of microbiology and re-serviring conditions, it is believed that indigenous microbial enhanced oil recovery through activating the hydrocarbon - oxidizing bacteria, anaerobic fermentative bacteria and methanogens is practical in this block.