The biodegradation of regular sterane and rearranged sterane in crude oil was studied on the basis of simulated biodegradation experiment to the crude oil.
The spectrums of sterane and terpane were simulated and compared with some parameters and spectrums of actual mixed crude. A satisfactory result has been obtained.
After crude oil alteration, the degree of sterane isomerization reaction is enhanced, and in some samples, the balanced endpoint value of isomerization reaction is exceeded far beyond.