Steranoids and terpanoids in source rocks and crude oils from the Gaoyou depression have been analyzed by GC-MS.The fact that C20 sterane 14 α(H)17α(H)20S/14α
Fault clay is the combined results of 10 ig-term dynamic-, thermal-metamorphism and tectonic geochemical process. Approximately similar fault clay can be produc
Holocene loess in the Middle Huanghe Valley can be subdivided into 3 formations which are composed commonly of upper loess and lower dark loessial soil (a kind