Vertical Migration System and Its Control on Natural Gas Accumulation in Yinggehai Basin
Zhao Baofeng
Chen Honghan
Kong Lingtao
Wang Qianru
Liu Rui
Abstract：Thermal fluid activity controlled by vertical migration system is one of major geological characteristics in the Yingge-hai Basin,which contributes to special hydrocarbon accumulation processes.Combined with a comprehensive interpretation of seismic section,3D property parameter extractions and thin section observation,The elements of the vertical migration system are analyzed and the diffused and migration overpressure are quantitatively calculated by PetroMod v11? 2D software in the pa-per.It is concluded that.diapir-associated fractures and hydraulic fractures are two main elements of vertical migration system in the basin.The processes vary vertically,with deep migration mainly controlled by hydraulic fractures while the shallow one mainly controlled by diapir-associated fractures in Dongfang area.Fluid activity pierces through the overpressure compartment vertically leading to the diffused overpressure surface being uplifted about 2 000 m in the center of the Yinggehai Basin.90% of the reservoir remaining pressure comes from migration overpressure at about 3 000 m of the Huangliu Group at present.(3) There are two potential nature gas accumulation zones in the basin,including a top-compartment conductive pressure zone and in-compartment diffused-conductive overpressure zone.As the nature gas reservoir is controlled by hydraulic fracture migration system and has the advantage of being close to the hydrocarbon source kitchen and effective migration,the in-compartment diffused-conductive overpressure zone is the most potential nature gas accumulation zone in the basin.
Keywords：earthquakevertical migration systemdiapirshydraulic fracturehydrocarbon accumulationpetroleum geology
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 1323-1332 )