苏北盆地戴南组泥屑流扇沉积

doi:10.11743/ogg20170301

摘要/Abstract

摘要： 针对苏北箕状断陷盆地戴南组的沉积体系、岩性岩相、砂体展布等特征，既不遵循中国东部箕状断陷盆地的一般规律，也不遵循陆相盆地沟槽带是建设扇体、砂体主带的普遍规律，通过大量岩心资料观察，发现戴南组存在一种由砂级泥岩粗岩屑组成的特殊类型沉积岩，其分布具有一定的普遍性和规律性。据此，以岩心观察描述为基础，结合岩石薄片鉴定特征、地层古生物组合特殊面貌及剖面测录井响应的一些特有现象，综合识别这套特殊岩性剖面。研究表明，这套地层是重力流之泥屑流流体的沉积产物—泥屑流扇，扇体可分扇根、扇中和扇端3带。平面上，此类扇发育在断陷湖盆凹缘坡折带，即湖盆沟槽地带；剖面上，此扇主要见于戴南组断陷湖盆低位域，湖侵域无此扇，高位域有个别此扇。分析认为，苏北箕状断陷湖盆有特殊的成盆古地质背景，即由下构造层大型的统一拗陷湖盆解体形成了相互分隔的戴南组箕状断陷群，由此形成了阜四段大套泥岩围限、新老双重物源、构造作用差异、多种搬运输送流态及多样坡折带类型等多因素耦合，共同控制了戴南组沉积特征。由此，发现了断陷凹缘坡折带发育泥屑流扇、富泥扇，断陷凸缘坡折带生长富砂扇的规律。

关键词: 泥屑流扇, 多因素耦合, 岩石特征, 沉积成因, 戴南组, 苏北盆地

Abstract: Several features such as sedimentary system,lithology and lithofacies and sandbody distribution in the Dainan Formation of Subei half-graben fault basin neither follow the general patterns of the half-graben faulted basins in Eastern China,nor follow the common patterns that trench belts are the main locations where fans and sandbodies occur in continental basins.Through a large number of core data observation,it is found that there is a special type of sedimentary rock composed of sand grade coarse debris of mudstone,which shows a certain universality and regularity.The special lithologic section is comprehensively identified on the basis of core observation and description and in combination with the thin section observation,paleontological assemblage and some peculiar phenomena of logging responses.The study shows that this set of strata belongs to fans resulted from mud debris flow,a type of gravity flow.The fan bodies can be divided into 3 belts including root-fan,middle-fan and outer-fan.Laterally,this kind of fan develops in the slope break zone of faulted lake basins which is trench zone of lacustrine basin.Vertically,these fans are mainly found in LST of the Dainan Formation of Subei fault basin.No such fans occur in TST,and some occur in HST.Subei half-graben fault basin was formed in a special geological setting.A large complete depressed lake basin in the lower tectonic zone disintegrated into several mutually separated half graben fault depressions.Multi factors including confining of thick mudstone in the 4^th Member of Funing Formation,old and new dual provenances,tectonic difference,various transportation flow patterns and mutiple types of slope break zones coupled together and controlled the sedimentary characteristics of Dainan Formation.The rules are found that the mud debris flow fans and mud-rich fans are developed in slope break zone on the concave side of fault depression and sand-rich fans occur in slope break zones on the convex side of the fault depression.

Key words: mud debris flow fan, multiple factors coupling, petrologic characteristics, sedimentary genesis, Dainan Formation, Subei Basin

中图分类号:

TE121.3

刘玉瑞. 苏北盆地戴南组泥屑流扇沉积[J]. 石油与天然气地质, 2017, 38(3): 419-429. doi: 10.11743/ogg20170301 Liu Yurui. Mud debris flow fan deposits in Dainan Formation of the Subei Basin[J]. Oil & Gas Geology, 2017, 38(3): 419-429. doi: 10.11743/ogg20170301

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