珠三坳陷文昌组烃源岩生烃动力学研究与地质意义

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中图分类号：P618.13 文献标志码：A

Abstract：Byanalyzing theabundance，typeand maturityof sourcerock organic mater，and utilizingrock pyrolysis nstrumentsandKineticssoftware，thehydrocarbongenerationkineticparametersofhighqualitysourcerocksinthesecondsection oftheWenchangFormationwereobtained.Theseparameterswerethenintegratedwithtypical geologicalheatingratesaswel astheburialand thermalevolutionhistoryofthedepressions toclarifyhydrocarbongenerationcharacteristicsandconversion rates.Theresultsshow thatsignificant diferences existinthekineticparametersandhydrocarbongenerationcharacteristics of the second section of the Wenchang Formation across different sags of the Zhu I depression.In Wenchang B sag，the activation energy distribution isrelatively narrow （ 179.91-259.41kJ/mol ），with a lower main activation energy（213.38- 217.57kJ/mol ）.Hydrocarbon generation begins earlier，reaches its peak sooner，and exhibits a higher maximum generation rate.In contrast，source rocks in Wenchang C sag have a wider activation energy range （ ）anda higher main activation energy （225.94-234.30kJ/mol ），resulting inlater initiation and peak of hydrocarbon generation， andalower maximum generationrate.At present，hydrocarbon conversionrates ofthe Wenchang Bsag sourcerocks are significantly higher than those of the WenchangC sag，with rates exceeding 90% in the eastern sub-sag and 30% in the western sub-sag，while those in the Wenchang C sag generally remain below 10% .These differences in current conversion rates are mainlyatributedtothecombinedefectsofsag structural evolutionandsourcerock hydrocarbon generationcharacteristics， which have significant implicationsforfutureoilandgas exploration.Inparticular，theeasternsub-sagofthe Wenchang B sagshowssubstantialpotentialformatureoiland gasreservoirexploration，whiletheWenchangCsag hasrelativelylimited potential.

Keywords：ZhuI depresson；Wenchang source rocks；sourcerocks evaluation；hydrocarbon generationsimulation；hydrocarbon generation kinetics

烃源岩生烃动力学研究的关键在于生烃热模拟试验、动力学参数获取以及地质条件下的外推应用。（剩余19225字）