Geochemical characteristics and origin of crude oil from Carboniferous volcanic rocks in the Hongche Fault Zone of the Junggar Basin of China

In recent years, significant advances have been made in the exploration of Carboniferous volcanic reservoirs Hongche Fault Zone Junggar Basin China, showing good prospects for further exploration. However, large variation physical properties crude oil and complex distribution rule inhibit one-step this study, PM scale biodegradation source were studied using experimental methods that target properties, bulk biomarker compounds oil. The potential area was analysed, an accumulation model established. Based on differences degree biodegradation, oils divided into four groups seven subgroups. Additionally, analysis combined with hydrocarbon-generation history rocks showed there at least two periods charging area. first period late Triassic, derived from P 1 f rock. Owing to strong tectonic activity during Indosinian movement, distributed footwall fault zone, reservoir exhibited different degrees forming subgroup I , II III . second Cretaceous, which rock natural gas generation stage, 2 w a mature stage. A small part formed by migrated mixed earlier rock, resulting subgroups IV originated sag peak generation. As approached stability latter period, it is speculated may be well-preserved primary slope areas fault, making these sites.