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1、第26卷5期中國煤炭地質(zhì)Vo1.26No.O52014年5月CoALGEOLOGYOFCHINAMav.2014doi:10.3969~.issn.1674—1803.2014.05.01文章編號:1674—1803(2014)05-0001一O8黔西北晚二疊世含煤巖系高分辨率層序地層與聚煤模式研究趙征,陳朝玉,譚華,王國榮(貴州地礦局104地質(zhì)大隊(duì),貴州都勻558000)摘要:在高分辨層序地層學(xué)基本理論指導(dǎo)下,結(jié)合研究區(qū)巖心數(shù)據(jù)、測井等資料對黔西北晚二疊世含煤巖系劃分出三個(gè)層序組,在此基礎(chǔ)上研究了黔西北晚二疊世的
2、聚煤模式。分析認(rèn)為:研究區(qū)晚二疊世厚煤層的形成與分布直接受控于古沉積環(huán)境,水城、納雍一帶聚煤中心的三角洲沉積組合利于厚煤層的形成;聚煤中心的遷移受控于沉積盆地旋轉(zhuǎn)引起的旋轉(zhuǎn)旋回沉積機(jī)制;龍?zhí)镀谝婚L興期持續(xù)海進(jìn)是研究區(qū)晚二疊世含煤巖系沉積期,尤其是晚二疊世沉積盆地順時(shí)針方向的旋轉(zhuǎn)導(dǎo)致可容納空間變化的非均一性,致使聚煤中心發(fā)生逆時(shí)針方向的北遷和回遷。關(guān)鍵詞:高分辨率;層序地層;旋轉(zhuǎn)旋回沉積;聚煤;遷移;晚二疊世;黔西北中圖分類號:P534.46;P539.2文獻(xiàn)標(biāo)識碼:AAStudyonLatePermianCoal—
3、。bearingStrataHighResolutionSequenceStratigraphyandCoalAccumulationPatterninNorthwesternGuizhouZhaoZheng,ChenChaoyu,TanHuaandWangGuorong(No.104GeologicalTeam,GuizhouBureauofGeologyandMineralResources,Duyun,Guizhou558000)Abstract:Undertheguidanceofhighresolutio
4、nsequencestratigraphybasicprinciples,combinedwithstudyarearockcore,welllog—gingdata,partitionedthelatePermiancoal—bearingstrataintothreesequencegroups,andthenstudiedthecoalaccumulationpatternintheareaonthisbasis.Theanalysisconsideredthattheformationanddistribu
5、tionoflatePermianthickcoalseamsaredirectlycon—trolledbypaleosedimentaryenvironment.DehasedimentaryassociationofcoalaccumulationcentersinShuicheng—Nayongdistrictisadvantageoustoformthickcoalseams.Themigrationofcoalaccumulationcentersarecontrolledbytherotational
6、cyclicsedimentationmechanismcausedbysedimentarybasinrotation.ThedurativetransgressionduringLongtan—Changxingperiodcoal—bearingstratased—imentarystage,especiallysedimentarybasinclockwiserotationwasthecausationofaccommodationspacevariationheterogeneityinthestudy
7、area,andcausedcounter-clockwisenorthwardmigrationandmovedbackofcoalaccumulationcenter.Keywords:highresolution;sequencestratigraphy;rotationalcyclicsedimentation;coalaccumulation;migration;LatePermianEpoch;n0rthwesternGaizhou0研究現(xiàn)狀基本形成了利于成煤的環(huán)境是海陸過渡相的共識,對黔西北含煤巖系復(fù)
8、合層序組下的聚煤中心遷移只有“江南煤?!敝Q的貴州,其黔西北重要含煤做了一般的描述,有關(guān)遷移機(jī)制的研究較少。本文巖系地層為龍?zhí)督M,很多學(xué)者做過較深入的層序地試圖在黔西北含煤巖系地層高分辨層序地層精細(xì)劃層研究,其中以陳代釗對黔西北龍?zhí)督M層序地層主分的基礎(chǔ)上,圈出各沉積時(shí)期的聚煤中心。分析認(rèn)要由TsT和HsT組成的認(rèn)識觀點(diǎn)為代表,TsT內(nèi)形為聚煤中心遷移機(jī)制受海