鄂尔多斯盆地南部延安组砂体粒度特征

Particle Size and Depositional Environment of Sandstone of Yan’an Formation in South Ordos Basin

通过对鄂尔多斯盆地南部黄陇煤田中下侏罗统延安组砂岩的粒度研究，根据各种粒度参数和基础图件，结合沉积构造、矿物成分等成因标志，解释了各砂体的沉积环境和水动力作用强度，判别出河流成因的各种砂体以及湖成三角洲、湖坪和砂坝等砂体特征，为煤层对比和成煤规律的研究提供了参考．

The particle size and depositional environment of sandstone of Yan’an formation of Lower middle Jurassic series in Huanglong coal field, south part of Ordos basin, are studied. The depositional environment of the sandstone and the strength of hydrodynamic action are successfully explained. The characteristics of different sandy bodies of river genesis and lacustrine delta and flat as well as sand banks are distinguished based on parameters of particle sizes and diagrams. The research will play an important role for the correlation of coal seams.