中寨矿区龙潭组层序划分方法及沉积相特征分析
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摘要
依据研究区钻孔岩心观察,结合测井及面上区域资料,并通过室内测试分析和野外调查等手段,重点研究区内ZZ808井,运用层序地层学、沉积学等多学科理论。划分了研究区龙潭组层序地层,系统研究了各层序地层特征。结果显示:龙潭组发育4个层序界面,将其划分为3个三级层序,SQ_1属于海相层序,SQ_2、SQ_3属于海陆过渡相层序,六个体系域。层序地层格架的建立分析显示龙潭早期发生脉动式海侵,以慢速海侵,快速海退为特征,沉积主体为障壁砂坝-■湖,沉积相呈北东—南西向展布,主要发育碳酸盐台地相、■湖-潮坪相和障壁沙坝相,含煤厚度自北东—南西逐渐减薄;龙潭晚期为区域性海退过程,发育三角洲相,三角洲成为沉积主体,煤层主要形成于海退—海侵转折期之后。
On the basis of the study area and drilling core observation and well logging data,Surface area data,and through the indoor test analysis and field investigation,especially studied ZZ808 Wells in the region,using the stratigraphy,sedimentology,geochemistry,coal geology theory,etc. In the longtan formation sedimentary palaeogeographic characteristics and coal accumulating pattern has carried on the system analysis.The result shows that the Longtan formation have four sequence interface,can be divided into three sequence,belongs to Marine facies sequence SQ_1,for SQ_2 and SQ_3 belong to private enterprise transition phase sequence,six systems tracts. The establishment of the sequence stratigraphic framework analysis showed that early longtan pulsing transgression,to slow transgression,rapid regression characterized,sedimentary body for barrier bar-lagoon,the sedimentary facies in the north east,south west distribution,major development of carbonate platform facies,lagoon,tidal flat and barrier bar phase,the thickness of the coal bearing from north east,south west gradually thinning; Late longtan for regional regression process,delta facies,delta become the subject of deposition of coal seam main form sea back-transgressive after the transition period.
On the basis of the study area and drilling core observation and well logging data,Surface area data,and through the indoor test analysis and field investigation,especially studied ZZ808 Wells in the region,using the stratigraphy,sedimentology,geochemistry,coal geology theory,etc. In the longtan formation sedimentary palaeogeographic characteristics and coal accumulating pattern has carried on the system analysis.The result shows that the Longtan formation have four sequence interface,can be divided into three sequence,belongs to Marine facies sequence SQ_1,for SQ_2 and SQ_3 belong to private enterprise transition phase sequence,six systems tracts. The establishment of the sequence stratigraphic framework analysis showed that early longtan pulsing transgression,to slow transgression,rapid regression characterized,sedimentary body for barrier bar-lagoon,the sedimentary facies in the north east,south west distribution,major development of carbonate platform facies,lagoon,tidal flat and barrier bar phase,the thickness of the coal bearing from north east,south west gradually thinning; Late longtan for regional regression process,delta facies,delta become the subject of deposition of coal seam main form sea back-transgressive after the transition period.
引文
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史晓颖,王训练.2000.中国层序地层研究[M].广东:广东科技出版社.
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王立亭,罗晋辉,王常徽,等.1993.贵州西部晚二叠世近海煤田地质特征及聚煤规律[J].贵州地质,(4):291-299.
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