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1、4文章编号:论中-新元古界的原生油气资源王铁冠1韩克猷2(1.中国石油大学油气资源与探测国家重点实验室北京102249;2.中国石油西南油气田分公司勘探开发研究院四川成都610051)摘要:在全球范围内,西伯利亚、非洲、东欧、印度、阿拉伯、澳大利亚等克拉通,均有中-新元古界至下寒武统原生油气与油气藏的报道,特别是东西伯利亚与阿曼两地,现探明的油气储量业已达到十亿吨级至亿吨级油当量的规模,证明中-新元古界的原生油气仍是一个值得关注的能源资源领域。中国中-新元古界,乃至下古生界,热演化程度普遍处于过成熟状态
2、,不利于液态石油的保存,目前尚未发现其原生油田,但是,在一些地区已发现大量中-新元古界油苗,或大规模的沥青脉,剖析其中-新元古界的含油性,有利于指导中-新元古界原生油气资源的勘探。以扬子克拉通川西北龙门山前山带,以及华北克拉通燕山北部坳陷带为例,由于上覆沉积盖层累计厚度较薄,中-新元古界无深埋经历,或者岩石圈异常增厚,形成“冷圈、冷盆”的地质条件,中-新元古界原生烃类始终处于石油“液态窗”内,仍有利于中-新元古界原生油气资源的保存。关键词:中-新元古界;原生油气;西伯利亚;冀北坳陷OnMeso-Neop
3、roterozoicprimarypetroleumresourcesWangTieguan1HANKeyou2(1.StateKeyLaboratoryofPetroleumResourceandProspecting,ChinaUniversityofPetroleum,Beijing102249,China;2.ResearchInstituteofPetroleumExploration&Development,PetroChinaSouthwestOil-GasFieldCompany,Che
4、ngdu610051,China)Abstract:Inviewofglobalscale,primaryoilandgasreservoirsoftheMeso-Neoproterozoic,andeventheLowerCambrian,havebeenreportedincratonsofSiberia,Africa,EastEurope,India,ArabiaandAustralia,especiallyintheEastSiberiaandOmanregions,sofartheproved
5、oilandgasreservesareuptoascaleof108tto109tofoilequivalents,whichtestifiesthattheMeso-Neoproterozoicpetroleumisanenergyresourcerealmworthyofnotice.InChina,thethermalevolutionlevelsoftheMeso-Neoproterozoic,andeventheLowerPalaeozoicstrataarecommonlyinoverma
6、turephaseunfavorableforthepreservationofliquidoils,thus,Meso-Neoproterozoicprimaryoilfieldsarenotyetdiscovereduptonow.However,alargenumberofoilseepagesand/orlargescalebituminousveinsarefoundintheMeso-Neoproterozoic,theanalysisoftheprimarypetroleumprospec
7、tivitywouldbehelpfultoguidingtheexplorationofMeso-Neoproterozoicoilandgasresources.ThecumulativethicknessofoverlyingsedimentarycoversisnotbigenoughsothattheMeso-Neoproterozoicstratahaveneverbeendeeplyburied,orthelithosphereisunusuallythickening,resulting
8、inageologicalconditionof"coollithosphereandcoolbasin".Therefore,astheLongmenshanpiedmontbeltintheYangtziCratonandtheNorthYanshanDepressionzoneintheNorthChinaCratonaretakenasexamples,theMeso-Neoproterozoicprimaryhydrocarbon