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Analysis And Discussion Of The Characters Of The Origin, Migration And Distribution Of CO2 Onshore And Offshoer Eastern China

Posted on:2008-04-17Degree:DoctorType:Dissertation
Country:ChinaCandidate:J X HeFull Text:PDF
GTID:1100360215450831Subject:Structural geology
Abstract/Summary:PDF Full Text Request
With comprehensive the geologic and geo-chemical data, I've studied the origin of CO2 and the key control factors for its migration and accumulation. It is shown that in the basins in the Eastern China, onshore and offshore, the formation of CO2 reservoir is crust-sourced and crust-mantal-mixed-sourced, mainly controlled by local activity of hot fluid into the mud diapir area in multi-phase and multi-zones in physical-chemical mechanism of very thick marine calcareous sandstone and mudstone of Pliocene-Miocene. The volcano- and mantle-sourced CO2 in the Qiongdongnan Basin and Pearl River Mouth Basin is mainly controlled by magmatism and major faults which cut through the basements and link to the mantle gas. According to the different controlling factors, different patterns of migration and accumulation, and different origins and different forming mechanism of CO2 reservoir, i.e., crustal diagenesis, and volcanic mantle-source CO2, we can trace the sources, analyze and predict the migration, accumulation and distribution model of gas, and especially CO2 over the basins, therefore, help to make the plan of petroleum exploration and reduce the risk of exploration.There are the innovations of this thesis:â‘ brought forward classification standards of crustal diagenesis and volcanic mantle-source CO2, set up accumulation mechanism of mud-diapir thermal fluids of crustal diagenesis CO2 in Yinggehai basin, and analysised its rules of migration and accumulation;â‘¡Based on the genesis, migration, accumulation and controlling factors of different types of CO2, preliminary predicted the favorable abundance zone of CO2, which is helpful to make the decision of natural gas exploration;â‘¢Used the abnormal evolution features of I/S ratio to analysis geothermal effect of different areas, which is also successfully used in the study of CO2 and mud-diapir thermal fluids.
Keywords/Search Tags:Eeastern China, sheifal basins, genesis of CO2, migration and accumulation, controlling factor
PDF Full Text Request
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