摘要
渐新统珠海组为南海北部深水区重要的油气勘探目的层段。综合应用岩心、测井、地震等资料，详细分析了白云凹陷珠海组的层序特征、沉积相类型及分布特征，明确了其沉积演化过程。研究结果表明：白云凹陷珠海组自下而上可划分为SQ1￣1，SQ1￣2，SQ1￣3等3个三级层序，主要发育陆架三角洲、陆架边缘三角洲、深水扇、扇三角洲与海相沉积。珠海组SQ1￣1沉积时期，近源陆架三角洲在白云凹陷北缘广泛分布，海相主要分布在凹陷南侧，扇三角洲发育在凹陷西南控洼断层之下；SQ1￣2，SQ1￣3沉积时期，在古珠江充足物源、区域构造沉降及海平面变化控制下，凹陷内形成北西—南东向大型陆架三角洲￣陆架边缘三角洲￣深水扇沉积体系组合，西南侧扇三角洲体系持续发育，规模逐渐缩小。
Abstract
The Oligocene Zhuhai Formation is an important target interval for oil and gas exploration in the northern deep?鄄water area of the South China Sea. Using core, logging and seismic data, the sequence characteristics, sedimentary facies types and distribution characteristics of Zhuhai Formation in Baiyun Sag were analyzed in detail, and the sedimentary evolution process was clarified. The results show that the Zhuhai Formation in Baiyun Sag can be divided into three third?鄄order sequences such as SQ1￣1, SQ1￣2 and SQ1￣3 from bottom to top, in which the main sedimentary facies of shelf delta, shelf?鄄margin delta, deep?鄄water fan and marine sediment are developed. During the sedimentation of SQ1￣1, the shelf delta of near source was widely distributed in the northern margin of Baiyun Sag, the marine facies were mainly distributed in the south side of the sag, and the fan delta was developed under the southwest controlled fault of the sag. During the sedimentation of SQ1￣2 and SQ1￣3, under the control of sufficient provenance of Paleo?鄄pearl River, regional tectonic subsidence and sea level change, the NW￣SE trending sedimentary system combination of large shelf delta, shelf margin delta and deep water fan was formed in the sag. The fan delta system in the southwest was developed continuously and its scale decreased gradually.
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