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时间:2020-06-01
《二龙山含煤盆地中新世富锦组沉积相及层序地层特征.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第42卷第4期煤田地质与勘探VOl_42NO.42014年8月coALGE0直0GY&E)10RⅡ0NAug.2014文章编号:1001-1986(2014)04.0001.07二龙山含煤盆地中新世富锦组沉积相及层序地层特征野兆瑞,曲延林2邵龙义,马立军,胡一鸿,李柱(1.中国矿业大学地球科学与测绘工程学院,北京100083;2.黑龙江省煤田地质局,黑龙江哈尔滨1500061摘要:黑龙江东部二龙山盆地是一新生代陆相聚煤盆地,中新世富锦组是其含煤地层。通过对富锦组沉积相、层序地层和聚煤作用特征的研究,可以看出:富锦组主要由凝灰质粉砂岩及中细砂岩、凝灰质砾岩及褐煤组成,发
2、育滨浅湖相、深一半深湖相、冲积扇扇根相、扇中相及沼泽相,分别属于湖泊沉积体系和冲积扇沉积体系;富锦组是一个以区域不整合面为上下界的三级层序,其低位体系域对应底部砾岩段,湖侵体系域对应下部砂岩段和中部含煤段,高位体系域对应上部砂岩段;研究区煤层形成于湖侵体系域末期,且以盆地中部煤层厚度最大,向西北和西南方向煤层均变薄;聚煤作用明显受基底沉降作用影响,在湖侵体系域末期基底稳定沉降阶段,可容空间增加速率与泥炭堆积速率相平衡,从而形成了区内巨厚煤层。关键词:二龙山盆地;新近纪;富锦组;湖侵体系域;聚煤作用中图分类号:P618.11文献标识码:ADOI:10.39698.iss
3、n.1001.1986.2014.04.001SedimentaryfaciesandsequencestratigraphyoftheMioceneFujinFormationinErlongshancoal-bearingbasinYEZhaomi,QUYanlm2,SHAOLongyi,MALijun2,HUYihong,LIZhu(1.SchoolofGeosciencesandSurveyingEngineering,ChinaUniversityofMiningandTechnology,Beijing100083,China;2.CoalfieldGeo
4、logicalBureauofHeilongfiangProvince,Haerbin150006,China)Abstract:ErlongshanbasinineasternHeilongjiangProvinceisaCenozoiccontinentalcoalbasinandMioceneFujinFormationisitscoal-bearingstrata.Inthispaper,wehavestudieditssedimentaryfacies,sequencestratigraphyandcoalaccumulationcharacteristic
5、s.FujinFormationiscomposedoftufaceoussiltstoneandfine—grainedsandstones,tufaceousconglomerates,andlignite,wasdepositedinlacustrineenvironmentsrangingfromlittoralandshallowlake,deeplake,mediumdeeplaketoalluvialfan.Twodepositionalsystemswereclassified;lacustrineandalluvialfan;thewholeFuji
6、nFormationcomposesathird—ordersequencewiththeregionalunconformitiesasitsupperandlowerbounds.Thelowstandsystemtractcorrespondstothebottomconglomeratemember,thetransgressivesystemstractcorrespondstothelowersandstonememberandmiddlecoal-bearingmember,andthehighstandsystemstractcorrespondsto
7、theuppersandstonemember.ThecoalseamsinVujinFormationwereformedattheendofthetransgressivesystemstract,andthethickestcoalisdistributedinthecentralzoneofthebasin,whichthinsouttowardsnorthwestandsouthwest.Coalaccumulationhasbeensignificantlycontrolledbybasinsubsidence,andduringthes
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