原位油气藏特征、形成机制和其资源潜力

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1、原位油气藏特征、形成机制和其资源潜力　　摘要：首次提出原位油气藏的概念，把油气生成的原生地层中形成的具有商业开采价值油气资源的地层单元称为原位油气藏，能够生成烃类并能为原位油气藏提供储集空间的地层称为原生地层。分析了原生地层中有机质含量与原位油气藏的形成关系以及原生地层中烃类的相态与有机质热演化程度，探讨了有机质的数量、类型、热演化程度以及在有机质热演化过程中地层中不同状态的有机质（干酪根→液态烃（沥青）→湿气→干气）相互转化等因素对原生地层中油气的富集程度以及原位油气资源相态的控制作用。中国发育了海相、海陆过渡相到陆相等多种沉积环境条件下10余套富含有机质及页岩油气资源的泥页岩系，

2、具备形成以页岩油和页岩气为主或油气共生特征的原位油气藏成藏条件和基础。原位油气藏中的原位油气资源作为重要的非常规油气资源将在今后的油气勘探工作中占据十分重要的地位。关键词：原位油气藏；原生地层；非常规油气；页岩气；有机质；相态；热演化；资源潜力中图分类号：P618.130.2文献标志码：ACharacteristicandFormingMechanismofOilgasTrapinSourceStrataandItsResourcePotentialTUOJincai1，ZHANGMingfeng1，WUChenjun1，2，25LIUYan1，2，CHENRu1，2，XIONGDe

3、ming1，2（1.KeyLaboratoryofPetroleumResourcesResearch，InstituteofGeologyandGeophysics，ChineseAcademyofSciences，Lanzhou730000，Gansu，China；2.UniversityofChineseAcademyofSciences，Beijing100049，China）Abstract：Oilgastrapinsourcestratawasputforwardfirstly；thetrapwasakindofhydrocarbonresourcestrataunitw

4、ithcommercialexploitationvaluefromoriginalformationgeneratinghydrocarbon；originalformationcouldgeneratehydrocarbonandsupplyreservoirspaceforoilgastrapinsourcestrata.Therelationshipbetweenorganiccontentandtheformationofoilgastrapinsourcestratawasanalyzed，andphasestateofhydrocarbonandthermalevolu

5、tiondegreeoforganicmatterinoriginalformationwasexplained.Thecontrollingfactorsonthelevelofoilgasenrichmentandthephasestateofoilgasresourceinoriginalformationwerediscussed，andthefactorsincludedabundance，typeandthermalevolutiondegree25oforganicmatterandthemutualtransformationamongdifferentphasest

6、atesoforganicmatterduringthermalevolution（kerogen→liquidhydrocarbon（bitumen）→wetgas→drygas）.InChina，morethan10setsofmudstoneshaleseriesrichinorganicmatterandshaleoilgasresourcedevelopedinvarioussedimentaryenvironmentsincludingmarinefacies，marinecontinentaltransitionalfacies，continentalfacies，et

7、c.，sothatoilgastrapinsourcestratacouldbeformedwiththecharacteristicsofmainlyshaleoilandgasorsymbiosisofoilandgas.Originaloilgasresourcefromoilgastrapinsourcestratatakenasunconventionalonewilloccupyanimportantpositioninfutureoilgas