Structure, petroleum potential and control factors of hydrocarbon accumulation zones in ancient complex of Siberian platform
The high mobility of Siberian platform during all stages and phases of its development provided duration, multiplicity of forms and ways of naphtides migration, specificity of structures hostng the oil-and-gas fields. The uniqueness of numerous hydrocarbon accumulations in Siberian platform with approach to their reasons have been shown on the base of systematized complex of diversified parameters (that reflects the oil-and-gas fields structures) and peculiarities of their potential. The reasons for the uniqueness have been described. Hydrocarbons productive is connected with the alongated reservoir rocks zones with higher permeability. Their formation was connected with large inter-block faults in the platform basement. Three types of structural links between HC fields and such fault zones may be distinguished. Associated fractures developed under Cambrian salt beds provide the block structures of oil-and-gas fields. Accumulations of oil-and-gas are distributed heterogeneously over areas due to variations in reservoir rocks permeability (terrigenous and carbonate). Their mosaic character is not chaotic - it is connected with the supplementary fractioning development in the latest phase of orogeny