东北大三江地区早白垩世岩相古地理探究

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1、东北大三江地区早白垩世岩相古地理探究　　摘要：通过大量野外观察，结合岩芯、测井及地震剖面资料，研究东北大三江地区早白垩世穆棱组、城子河组的沉积相；并在对各个沉积相带的沉积特征和时空展布归纳和总结的基础上，编制了一套早白垩世穆棱组、城子河组岩相古地理图。结果表明：城子河组和穆棱组沉积相类型丰富，以滨浅湖、三角洲平原等浅水沉积为主，夹数层沼泽相煤和海相夹层；在古隆起的边缘有扇三角洲、辫状河相存在，向盆内过渡为滨浅湖和半深湖。城子河组沉积时期，汤原断陷周边发育扇三角洲沉积，绥滨坳陷和前进坳陷以三角洲和滨浅湖沉积为主

2、，局部发育半深湖，并发育海相夹层和沼泽沉积；鸡西盆地和勃利盆地以三角洲和滨浅湖沉积为主，虎林盆地以滨浅湖沉积为主，局部发育半深湖，并发育海相夹层和沼泽沉积；穆棱组沉积时期，汤原断陷周边发育扇三角洲沉积，绥滨坳陷和前进坳陷地层不太发育，鸡西盆地和勃利盆地以三角洲和滨浅湖沉积为主，局部发育半深湖，并发育海相夹层和沼泽沉积，虎林盆地南部凹陷以滨浅湖沉积为主。早白垩世穆棱组、城子河组时期，张广才岭和桦南隆起是盆地主要物源供给区。关键词：岩相古地理；早白垩世；沉积相；穆棱组；城子河组；地震剖面；大三江地区25中图分类号

3、：P531文献标志码：AStudyonEarlyCretaceousLithofaciesPaleogeographyinDasanjiangAreaofNortheastChinaJIHancheng1，MENXiangyong2，WENGQingping1，YANGDongjie1，MENGPeiwei1（1.SchoolofGeosciences，ChinaUniversityofPetroleum，Beijing102249，China；2.PetroChinaCoalbedMethaneCo.，Lt

4、d.，Beijing100028，China）Abstract：Accordingtofieldobservation，analysisofcores，loggingandseismicdata，sedimentaryfaciesofEarlyCretaceousMulingFormationandChengziheFormationinDasanjiangareaofNortheastChinawasconducted；sedimentaryfeatureandtemporalspatialdistribu

5、tionofeachsedimentaryfaciesbeltweresummarized，andthenlithofaciespaleogeographymapsofMulingFormationandChengziheFormationweredrawnup.TheresultsshowedthattypesofsedimentaryfaciesinMulingFormationandChengziheFormationwererich，shallowwatersedimentaryincludingsh

6、oreshallow25lacustrineanddeltaplainwaspredominantwithalittlecoalbeds，withswampfaciesandmarineinterlayers；fandeltaandbraidedriverexistedinthemarginofpalaeohigh，andchangedtoshoreshallowlacustrineandsemideeplakefromthemargintothedepocenterofthebasin.Fandeltade

7、positdevelopedaroundTangyuanriftduringthesedimentaryperiodofChengziheFormation，deltaandshoreshallowlacustrinewerethemainsedimentaryfaciesinSuibinriftandQianjinrift，andsemideeplake，marineinterlayerandswampdepositdevelopedpartially；deltaandshoreshallowlacustr

8、inewerethemainsedimentaryfaciesinJixiBasinandBoliBasin，andshoreshallowlacustrinedepositdevelopedinHulinBasin，andsemideeplake，marineinterlayerandswampdepositdevelopedpartially；fandeltadepositdevelopedar