Hydrocarbon Accumulation Process in the Marine Strata in Jianghan Plain Area, Middle China

摘要: Marine strata in the Jianghan Plain area are widely distributed with a total depth of more than 8,000 m from Upper Sinian to Middle Triassic. Six reservoir caprock units, named Z–€2, €2–O, S, D–C, P and T1, can be identified each epoch. The geology, stratigraphy, drilling, oil testing other basic data as well measured inclusion strontium isotope study used analysis formation evolution process marine petroliferous reservoirs area. This aims provide scientific basis for further exploration hydrocarbons reduce risks by analyzing key factors hydrocarbon accumulation strata. Our findings show that Lower Palaeozoic reservoir, oil/gas migration chiefly occurred early period Early Yanshanian, was destroyed middle–late Yanshanian. In Triassic–Carboniferous suffered destruction Late Yanshanian Himalayanian. preservation conditions have been improved since However, because all source beds missed generation fastigium lost capacity generate secondary hydrocarbon, no reaccumulation detected area's No industrially exploitable has discovered began 1958. confirms completely destroyed, poor primary factor leading unsuccessful exploration. It is safely concluded quite risky.