塔里木盆地东河砂岩沉积期沉积特征

发布时间：2018-03-08 15:45

  本文选题：开阔台地相　切入点：滨外陆棚相　出处：《西南石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：论文以层序地层学、沉积学等相关理论为指导,充分利用研究区内地震、钻井、测井、录井、岩心、岩屑等基础资料,应用宏观和微观研究相结合的手段,建立了塔里木盆地东河砂岩沉积期层序地层格架,并对该时期沉积相类型及特征、沉积相分布及沉积模式进行了综合分析描述。依据盆地各典型单井岩电特征及露头特征,结合东河砂岩沉积期相对海平面变化,认为沉积期发育一个三级层序,包括海侵、高位体系域及8个四级层序,其中四级层序1、2、3、4、5、6属于三级层序的海侵体系域,四级层序7、8属于三级层序的高位体系域。东河砂岩沉积期形成的巴楚组地层的岩石类型比较丰富,包括碳酸盐岩类和碎屑岩类,巴楚组包括东河砂岩段、下泥岩段及生屑灰岩段,其中碳酸盐岩类主要发育于东河砂岩沉积期的生屑灰岩段,碎屑岩类主要发育于东河砂岩沉积期的东河砂岩段和下泥岩段;东河砂岩段岩石类型主要为成熟度高的砂岩,下泥岩段岩石类型主要为低能的暗色泥岩,亦出现少量泥晶灰岩;生屑灰岩段岩石类型主要为生屑灰岩、泥晶灰岩等。在盆地东河砂岩沉积期发育开阔台地相、半局限台地相、滨外陆棚相、滨岸相、河口湾相以及辫状河三角洲相等6个沉积相和台内滩、滩间海、泻湖、半局限台地海、临滨、前滨、后滨、辫状河三角洲平原等多个沉积亚相。其中滨岸相、河口湾相、辫状河三角洲相主要分布于东河砂岩沉积期地层中下部,滨外陆棚相主要分布于中部,半局限台地相、开阔台地相主要分布于顶部。在东河砂岩沉积期,海水不断向东入侵,自西向东,海侵体系域内各四级层序的滨外陆棚-滨岸沉积体系不断向东迁移,东河砂岩沉积位置随之东移;高位体系域内四级层序形成开阔台地-半局限台地-滨岸相沉积体系,且台地相沉积范围宽广而滨岸相仅在研究区东北部沿古陆呈狭窄带状分布。
[Abstract]:Based on sequence stratigraphy, sedimentology and other related theories, make full use of the study area of seismic, drilling, logging, logging, core, debris and other basic data, application of macroscopic and microcosmic research method, established the Donghe sandstone sedimentary period in Tarim Basin, sequence stratigraphy, and the sedimentary facies types and characteristics of period that makes a comprehensive analysis of the distribution of sedimentary facies and sedimentary model description. According to the typical electrical characteristics of single well basin and outcrop characteristics, combined with the Donghe sandstone sedimentary period of relative sea-level change, considered a three grade sequence, depositional period including transgressive, highstand system tract and 8 four level sequence, including four transgressive system tract sequence 1,2,3,4,5,6 is three order sequence, HST four sequence 7,8 belongs to the three grade sequence. The Bachu formation formed during the deposition of the Donghe sandstone rock types are abundant, including carbonate 绫诲拰纰庡睉宀╃被,宸存�氱粍鍖呮嫭涓滄渤鐮傚博娈�,涓嬫偿宀╂�靛強鐢熷睉鐏板博娈�,鍏朵腑纰抽吀鐩愬博绫讳富瑕佸彂鑲蹭簬涓滄渤鐮傚博娌夌Н鏈熺殑鐢熷睉鐏板博娈，

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