Key Geological Conditions Affecting Pyrolysis Experiments of Marine Source Rocks for Hydrocarbon Generation
Zheng Lunju
Guan Defan
Guo Xiaowen
Ma Zhongliang
Abstract：Hydrocarbon generation simulation experiment (pyrolysis)is important for studying petroleum generation mecha-nisms and quantitatively estimating hydrocarbon generation potential of source rocks.The simulation experiment results not on-ly depend on the temperature,pressure and duration,but also on the pore fluid,source rock compaction.In this paper,marine black mudstone with low maturity from the Permian Dalong Formation (P2 d )is used for hydrocarbon generation simulations with two types of high-pressure liquid water and low-pressure water steam.The results show that the high-pressure liquid wa-ter can increase the organic matter petroleum generation potential greatly,enhancing oil generation and retarding the transfor-mation from oil to gas,suggesting important influence of geological factors such as high-pressure liquid water,fluid pressure and pore space on the hydrocarbon generation of the source rocks.The increase of the petroleum generation potential is due to the fact that the physicochemistry reaction of the kerogen is greatly enhanced at the presence of the near-critical properties wa-ter.It is concluded that the water in the pore space of the source rocks is of the high-pressure and low-temperature liquid water in the subsurface temperature (100-200 ℃)and pressure (30-120 MPa)conditions,which has the properties of near-critical water.Therefore,the hydrocarbon generation simulation experiment (pyrolysis)with high-pressure liquid water is more close to the actual geological conditions than that of the low pressure water steam and could be used to estimate hydrocarbon genera-tion potential of source rock more effectively.
Keywords：pyrolysis simulation experimenthigh-pressure liquid waterfluid pressurepore spacehydrocarbon generation potentialpetroleum geologyhydrocarbon
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 909-917 )