桑托斯盆地盐上阿尔比阶台地边缘滩特征及其控制因素

巴西桑托斯盆地阿尔比阶碳酸盐岩沉积为典型的台地边缘滩相,通过对地震反射结构、钻井岩性、薄片分析多方面分析,总结出了阿尔比阶台地边缘滩相的主要特征及主控因素。台地边缘滩以鲕粒灰岩、砂屑灰岩沉积为主,反映了浅水动荡的沉积环境,阿尔比阶灰岩颗粒滩符合镶边碳酸盐岩台地沉积模式,从陆地向海方向依次发育泻湖、浅水砂屑滩相、台地边缘滩后相、台地边缘滩相和斜坡相等沉积相带。古隆起和水体变化是颗粒滩发育的主控因素,成岩作用是储层物性的关键控制因素。平面上,盆地西南部开阔台地内古盐拱区及陆架边缘坡折带为阿尔比阶灰岩有利储层发育区。

Characteristics and controlling factors of the marginal shoal of the Albian platform of the Santos Basin

The Albian carbonate deposits in the Santos Basin of Brazil are typical platform marginal shoal facies. Through the analysis of seismic reflection structure, drilling lithology and thin section analysis, main characteristics of the marginal shoal of the Albian terrace are summarized. The marginal shoal of the platform is mainly composed of glutinous limestone and sandstone limestone, reflecting the turbulent sedimentary environment of the shallow water. The the sedimentary model is the rimmed carbonate platform, and develops The lagoon, the shallow-sand shoal facies, the platform shoal, the platform margina facies, and the slope facies from the land to the sea. The paleo-uplift and water depth change are the main controlling factors of the development of limestone beach, and diagenesis is the key controlling factor of reservoir physical property. On the plane, the ancient salt arch area and the shelf edge of the continental shelf in the open platform of the southwestern basin are favorable reservoir development areas.