Distribution Characteristics of the Chang 6 Sedimentary System( Triassic) in Huanxian Area, Ordos Basin
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摘要: 岩矿资料表明,鄂尔多斯盆地西部环县地区延长组长6三角洲沉积体系物源来自西部。进一步的地震相研究表明,该三角洲沉积体系在虎洞一带分为两支,一支沿环县—樊家川一线呈东西方向展布,另一支顺洪德方向呈北东向延展,并在耿湾—罗卜塬附近与东北物源体系的安边三角洲交汇。Abstract: Decrease of debris and nonresistance minerals and increase of stable minerals such as quartz and zircon from west to east in the Huanxian region show that sediments of the Chang 6 delta system in this area was from the western regions. Three kinds of seismic facies could be recognized in the Chang 6 beds: the middle or high amp litude value-subparallel-relatively continuous reflection, the foreset reflection and the middle or low amp litude value-parallel reflection, corresponding to the deltaic plain, the deltaic front and the prodelta clay(or interdistributary clay) , respectively. Distribution characteristics of seismic facies suggest that the Huanxian Chang 6 delta system could be divided into two branches in the Hudong region: one extends easternwards from Huanxian to Fanjiachuan, another goes to Hongde in NE direction and meetswith the Anbian delta in Gengwan-Luobuyuan region. The front parts of the eastern Huanxian delta of Well Huan 4-Huan 41 are the ideal places to explore the lens and pinchout eservoirs.
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