摘要:
四川盆地西部侏罗纪为内陆盆地,除其北缘早侏罗世有湖沼相外,主要为河流相与湖泊相,邻龙门山区发育冲积扇,其余地区发育冲积平原相和泛滥平原相。依据湖泊积水状况,将湖泊相细分为时令湖相、间歇湖相和长年湖相。印支期,甘孜-阿坝造山带形成,四川盆地由湿热气候演变为干燥、炎热气候;并使早侏罗世-中侏罗世早期成为长年湖泊环境。受燕山早中期构造运动影响,河流相、时令湖相与间歇湖相发育。长年湖相形成了侏罗系重要的生储油层系。河流相的粗碎屑岩成为储层,时令湖相与间歇湖相的泥质岩成为盖层,组成了侏罗系中上统多个储盖组合。
Abstract:
During the Jurassic, an interior basin once occupied the western part of the Sichuan Basin, in which the fluvial and lake deposits predominated. The alluvial deposits are common near the Longmen Mountain area. The alluvial plain and floodplain deposits occur in the other parts of the basin. The lakes in the study area may fall, according to lake water regimes, into seasonal lakes, intermittent lakes and perennial lakes. During the (Indosinian), the (Garze)-(Aba) orogenic zone came into being. The climates in the basin recorded a transition from the humid and hot ones to the arid and hot ones. The basin then became a perennial lake during the Early and early Middle Jurassic. The early and middle Yanshanian tectonic movements permitted the fluvial, seasonal lake and intermittent lake facies to be developed. The perennial lake deposits are believed to be most (important) (Jurassic) source rocks and reservoir rocks. The (coarse)-(grained) clastic rocks of the fluvial facies may serve as the (reservoir) (rocks), and the argillaceous rocks of the seasonal lake and intermittent lake facies as the cap rocks, both of which constitute a number of reservoir-seal associations in the Upper and Middle Jurassic strata.
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