川中地区大安寨段介壳滩沉积特征及控制因素

发布时间：2018-08-07 08:37

【摘要】：在岩芯及显微镜下观察的基础上,明确了川中地区侏罗系大安寨段发育介壳灰岩、含泥质介壳灰岩与泥质介壳灰岩等3种岩石类型,为浅湖—半深湖环境介壳滩不同微相的沉积产物。测井及地震相综合分析认为,介壳滩中可进一步识别出滩主体、滩翼及滩前斜坡等几种微相,这几种微相在平面上的分布主要受古地貌控制:滩主体分布在水下隆起区;滩翼分布于水下隆起周缘;滩前斜坡主要分布于水下隆起区与沉积中心之间的过渡环境。介壳滩在纵向上的演化和迁移主要受湖平面变化控制,湖平面上升期,介壳滩由湖盆中心的低隆起区向湖盆周缘隆起区迁移;而在湖平面下降期,介壳滩又逐渐由湖盆周缘隆起区向湖盆中心低隆起区迁移。
[Abstract]:Based on the observation of core and microscope, three kinds of rock types, such as meso-limestone, argillaceous meso-limestone and argillaceous meso-limestone, have been identified in the Jurassic Da'anzhai section of central Sichuan. It is a sedimentary product of different microfacies in shallow lake and semi deep lake environment. The comprehensive analysis of logging and seismic facies shows that the main body of the beach, the flank of the beach and the slope in front of the beach can be further identified. The distribution of these microfacies on the plane is mainly controlled by paleogeomorphology: the main body of the beach is distributed in the area of underwater uplift; The flank is distributed around the underwater uplift, and the slope in front of the beach is mainly located in the transitional environment between the underwater uplift and the sedimentary center. The vertical evolution and migration of the meso-crust beach are mainly controlled by the changes of the lake level. During the upwelling period of the lake surface, the meso-crust beach migrated from the low uplift area in the center of the lake basin to the marginal uplift area of the lake basin, while in the period of the lake plane descending, The crust beach gradually migrated from the uplift area around the lake basin to the low uplift area in the center of the lake basin.
【作者单位】：中国石油杭州地质研究院;
【基金】：中国石油科技重大专项(2012E-2601-02)
【分类号】：P618.13

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