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1、第28卷第4期OIL&GASGEOLOGY2007年8月文章编号:0253-9985(2007)04-0458-08川东北地区长兴组—飞仙关组沉积格局及成藏控制意义倪新锋,陈洪德,田景春,韦东晓(成都理工大学“油气藏地质及开发工程”国家重点实验室,沉积地质研究院,四川成都610059)摘要:川东北上二叠统长兴组—下三叠统飞仙关组总体为碳酸盐台地沉积,受古断裂的控制,宽广的台地被切割成台隆与台盆的沉积格局。受开江-梁平台盆的控制,长兴晚期—飞仙关早期在其两侧发育了较为对称的类似于威尔逊相模式的碳酸盐岩沉积体系,但陆棚相
2、不甚发育,可能是台盆深度小、宽度窄、相变快引起的。由于期间经历了一次二级海平面的升降过程,使得长兴组广泛发育海侵生物礁,而飞仙关组发育海退型鲕粒滩,形成两类最为有利的储集相带。生物礁、鲕滩沉积相带在纵横向上不断迁移、抬升,主要发育于台盆的两侧,呈不连续环带状分布,明显受沉积相带控制。关键词:沉积格局;区域成藏;台盆;长兴组;飞仙关组;川东北地区中图分类号:TE11113文献标识码:ASedimentaryframeworkofChangxing2FeixianguanFormationsanditscontrolon
3、reservoiringinnortheasternSichuanbasinNiXinfeng,ChenHongde,TianJingchun,WeiDongxiao(StateKeyLaboratoryofOil/GasReservoirGeologyandExploitation,ChengduUniversityofTechnology,Chengdu,Sichuan610059)Abstract:Asawhole,theUpperPermianChangxingFormation2LowerTriassicF
4、eixianguanFormationinnortheast2ernSichuanbasinweredepositedascarbonateplatform.Theextensiveplatformwascutintoplatform2highsandplatformbasinsbyfossilfractures.BeingcontrolledbyKaijiang2Liangpingplatform2basin,relativelysymmetricalcarbonatesedimentarysystems,simi
5、lartoWilson′sfaciespattern,weredevelopedonbothsidesofthebasininlateChangxingtoearlyFeixianguanage,butshelffacieswerepoorlydeveloped.Itispossiblyduetotheshallowdepth,narrowwidthandrapidfacieschangeoftheplatform2basin.Asecond2ordereustaticsealevelchangeduringthis
6、periodresultedinthewidelydevelopmentoftransgressivebioherminChangxingFormationandregressiveooliticshoalsinFeixianguanFormation,bothofwhichwouldbethemostfavorablereservoirfaciesbelts.Thebio2hermandooliticshoalfaciesbeltscontinuouslymigratedlaterallyandupraisedve
7、rtically.Theyweremainlydevel2opedonbothsidesoftheplatform2basinsandcharacterizedbydiscontinuouszonarydistribution,whichwereobvi2ouslycontrolledbysedimentaryfaciesbelts.Keywords:sedimentaryframework;regionalaccumulation;platform2basin;ChangxingFormation;Feixiang
8、uanFormation;northeasternSichuanbasin[1～16]近年来,川东北上二叠统长兴组—下三叠统田。纵观前人的研究成果,长兴组—飞仙关飞仙关组天然气勘探取得了重大突破,发现了我组沉积记录了“开江-梁平海槽”和其两侧台地国目前最大的以礁、滩相储层为主的整装天然气形成特殊的“两隆一凹”台-盆相间的沉积格局,收稿日期:20
