【摘要】 四川盆地中西部上三叠统沉积背景有利于特大型深盆气藏的形成 ,其沉积相带的圈定是深盆气有利区带评价的基础 .通过岩心描述和分析 ,并结合地震相、砂体结构及分布特征 ,对四川盆地中西部上三叠统沉积相进行了分析 .研究区沉积相可划分为河流三角洲、海湾、湖泊和冲积扇等 4种类型 ,其中三角洲是研究区的主要骨架砂体 .在前人工作的基础上 ,依据沉积物源、砂体发育特征及其相标志特征 ,对上三叠统须家河期须一须三亚期和香溪期香二香六亚期的沉积相展布特征进行了研究 ,对上三叠统各期沉积演化特征进行了综合表征 .分析结果表明 ,四川盆地中西部上三叠统具有深盆气生成、运移和聚集的岩相古地理基础 .更多还原

【Abstract】 Depositional settings of the Upper Triassic of western Sichuan Basin are favorable for the formation of giant deep basin gas traps. Based on microfacies of cores and sandbody texture as well as facies analysis, the main types of sedimentary facies in the Upper Triassic sequence of western Sichuan Basin have been identified. They include fluvial-dominated delta, embayment, lake, and alluvial fan. The delta constitutes the dominated reservoir in the deep basin. Based on correlation of sedimentary provenance, sandbody geometry, and environmental parameter, the depositional systems and sedimentary facies in each members of the Upper Triassic sequences are described in detail.更多还原