东濮凹陷杜寨地区沙三~3段沉积相研究
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摘要
杜寨地区沙三 3段地层划分为 4个T -R旋回 ,每个T -R旋回又由 2 - 4个数目不等的准层序组成。 4个T -R旋回对应三个地震层序 ,每一个地震层序由杂乱反射地震相、迭瓦前积地震相 ;不同振幅、不同频率、不同连续性的平行、亚平行地震相构成。岩性、岩石成分成熟度和结构成熟度、沉积构造、粒度特征、古生物组合、沉积层序、地层倾角测井资料、鲕的存在等沉积特征都表现为牵引流特征。综合分析认为 ,本区沙三 3段发育湖泊三角洲和浅滩沉积 ,三角洲又细分为三角洲平原、三角洲前缘、前三角洲沉积。该沉积体系受气候旋回和构造旋回双重控制
Sand interval S 3_3 in Duzhai area can be divided into 4 T-R cycles, each consists of 2-4 penesequences. These T-R cycles matched with three seismic sequences. Each seismic sequence is composed of chaotic reflection seismic facies, iterative progradation seismic facies and , sub-parallel and parallel seismic facies with various amplitudes, frequencies and discontinuities. Drag flow is shown in the depositional features of lithology and rock composition maturity, structure maturity, depositional structure, grain size, palaeontology grouping, sedimentary sequence, dip log data, and the presentation of ooid. It is concluded from general analysis that lake delta and shoal deposit are developed in sand interval S 3_3 in this area, and the delta can be sub-divided into delta plain, delta front and prodelta deposit. This depositional system is controlled by both climate cycles and structural cycles.
Sand interval S 3_3 in Duzhai area can be divided into 4 T-R cycles, each consists of 2-4 penesequences. These T-R cycles matched with three seismic sequences. Each seismic sequence is composed of chaotic reflection seismic facies, iterative progradation seismic facies and , sub-parallel and parallel seismic facies with various amplitudes, frequencies and discontinuities. Drag flow is shown in the depositional features of lithology and rock composition maturity, structure maturity, depositional structure, grain size, palaeontology grouping, sedimentary sequence, dip log data, and the presentation of ooid. It is concluded from general analysis that lake delta and shoal deposit are developed in sand interval S 3_3 in this area, and the delta can be sub-divided into delta plain, delta front and prodelta deposit. This depositional system is controlled by both climate cycles and structural cycles.
引文
〔1〕JohnsonJG ,KlapperG ,DevonianeustatticfluctationsinEuramerica,Bull.Geol.Soc.America,1985,99:567-587
〔2〕EmbryAF .Ransgressive-regressive(T -R)sequenceanalysisoftheJurassicseccessionoftheSverdrupBasin,CanadianArcticArchipela go,Can.J.Earth.Sci.1993,30:301-320
〔2〕EmbryAF .Ransgressive-regressive(T -R)sequenceanalysisoftheJurassicseccessionoftheSverdrupBasin,CanadianArcticArchipela go,Can.J.Earth.Sci.1993,30:301-320
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