全新世长江三角洲地区砂体的特征和分布
THE CHARACTERISTICS AND DISTRIBUTION OF HOLOCENE SAND BODIES IN CHANCIIANG RIVER DELTA AREA
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摘要: 砂体是三角洲的重要沉积单元,它构成三角洲的骨架,决定三角洲的形态,反映三角洲的演变过程,是认识三角洲的关键.砂体的矿物组分能为推断三角洲的物质来源提供重要线索,而其内部特征则是判断沉积环境最灵敏、最可靠的因素.三角洲砂体的上覆和下伏层及其与砂体的接触关系,有助于辩认海进海退和沉积盆地发育历史.此外,三角洲砂体紧靠富含有机质的泥质沉积,是石油和天然气储集的良好场所,是勘探的主要目标.因此,研究三角洲砂体不仅具有理论意义,而且能为沉积矿产资源的勘探提供有价值的资料.Abstract: The Holocene sand bodies in Changjiang River delta area may be classified genetically as river mouth sand, marine sand and river channel-fill sand, which are different in external geometry, internal characteristics, spatial distribution and contact with overlying and underlying beds. Their areal distribution forms a complicated complex that may be considered as a typical sand distribution model of tide-dominated deltas. In Holocene, Changjiang River delta area were subjected to transgression caused by the postglacial rise of sea level, and regression resulting from delta progradation. As a consequence of the alternative transgression and regression sand bodies have the characteristics of two-storeyed beds in vertical sequence. The transgressive sands are overlain by regressive ones, and there is a wedge of marine clay between them.
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