Gas Migration and Accumulation Modelling in Volcanic Reservoirs,Xujiaweizi Fault Depression, Songliao Basin
Wang Min
Lu Shuangfang
Wang Wenguang
Chen Shumin
Zhang Xi
Guan Ying
Abstract：Volcanic reservoirs and oil & gas shows have been found worldwide.However, the modelling of volcanic rocks related hydrocarbon accumulation process shows little progress due to strong volcanic reservoir heterogeneity.Using PetroMod software, gas migration and accumulation in the volcanic reservoirs has been successfully modelled for the first time in this study.Three dimensional geological modelling, key parameters or methods selection are described in detail.Based on the statistical porosity of volcanic rocks, the relationship of porosity versus depth for volcanic rocks was established using an exponential model, then the gas migration and accumulation processes under different situations, such as fault activity periods and flow simulation methods, were modelled.The results show that gas generation from organic matter in the study area has a long period in a relay mode without major gas generation period;volcanic gas reservoirs formed mainly during Quantou-Qingshankou Formation end period, and gas reservoir distributions were controlled by fault locations, activity periods, volcanic rock mass and porosities;the fault activity time is before 94.5Ma indicated by simulation results.It is concluded that the integrated migration method is the best way for describing gas migration in the volcanic rocks.Slope zone, micro-structures in the sag, lithologic pinchout and volcanic mass are favorable zones for the volcanic gas exploration in the study area, meanwhile, the tight conglomerate or tight sand in the deep formation should also have a great potential for gas exploration.
Keywords：migration and accumulation modellingkey parametersnatural gasvolcanic rockXujiaweizi fault depressionpetroleum geology
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：13( 397-409 )