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在油气藏形成之后所经历的地史过程中 ,构造运动使其圈闭条件有不同程度的改变 ,油气藏中的烃类发生再运移 ,从而造成油气藏的破坏再形成 ,或者使其遭到彻底破坏。油气藏的变化使烃类的性质也产生变化 ,如生物降解作用使原油稠化 ,或地热作用使其发生热裂解而成气。对 3种油样进行的热裂解成气模拟实验结果表明 ,地温条件、压力和时间对原油裂解成气均有明显的影响。对克拉玛依油田和孤岛油田原油中细菌成活情况的检测结果表明 ,细菌生长的最佳温度是 30℃ ,最佳生长环境是淡水及pH为 7的地层水。原油被菌解后 ,其物理和化学性质均被改造
During the geological history after the formation of oil and gas reservoirs, the tectonic movement changed the trapping conditions to some extent. The hydrocarbon in the reservoirs re-migrated, resulting in the destruction of the reservoir and reformation, To completely destroy. Changes in hydrocarbon reservoirs will also change the nature of hydrocarbons, such as the role of biodegradation of crude oil thickening, or pyrogenic pyrolysis of gas. The pyrolysis results of the three oil samples into gas show that the geothermal conditions, pressure and time have a significant effect on the cracking of crude oil into gas. Bacteriological tests on crude oil in Karamay Oilfield and Gudao Oilfield showed that the optimal temperature for bacterial growth was 30 ℃, and the optimum growth environment was fresh water and formation pH of 7. Crude oil was bacteria solution, its physical and chemical properties have been transformed