Abundance of unsaturated acid and isomeric acid are discovered in 1 188.24-1 210 m interval,indicating that the geochemical environment and type of gas source rock in this interval are suitable for living and growth of bacteria.

• 在1 188.；24~1 210 m层段内发现了丰富的不饱和酸和异构酸；说明在这个层段内地化环境以及气源岩类型较适宜细菌的生存发育。