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珠江口盆地白云凹陷北坡恩平组上段三角洲煤系及与其相关的陆源海相泥岩是该地区已经获得勘探证实的主要烃源层系。根据地震剖面及钻井资料,该三角洲可以分为3期。稀土元素结合区域基底岩性特征表明,恩平组上段第Ⅰ期三角洲物源区为番禺低隆起,供源河流表现为近物源的辫状河特征;恩平组沉积晚期,恩平凹陷与白云凹陷连通,恩平组上段第Ⅲ期三角洲物源区主要为北部隆起区,供源河流表现为远物源的曲流河特征;第Ⅱ期三角洲母岩表现为混合特征,是物源转换过渡期的产物。恩平组晚期物源区的北移以及供源面积的扩大造成了三角洲物源供给的增强,而这正是白云凹陷北坡恩平组进积三角洲持续发育的主要原因之一。砂岩的颗粒组分是控制深部储层质量的重要因素,白云凹陷恩平组上段因母岩变化导致砂岩中长石含量较高,具备了发育大量次生孔隙的物质条件,而三角洲分流河道及其前缘各类砂体是理想的有利储层发育相带,白云凹陷北部恩平组上段具备发育优质储层的潜力。
The Upper Triassic coal series and the associated marine source mudstones in the Upper Enning Formation on the northern slope of the Baiyun Sag in the Pearl River Mouth Basin are the major hydrocarbon source strata that have been confirmed by exploration in the area. According to the seismic section and drilling data, the delta can be divided into three phases. The lithological characteristics of the REE-binding basement indicate that the source region of the first phase of the Upper Triassic Enping Formation is a Panyu low uplift and the source river is a braided river characterized by near-provenance. In the Late Enping Formation, the Enping Depression and In the Baiyun sag, the source region of the third phase of the Upper Triassic in Enping Formation is mainly the northern uplift and the source river is characterized by meandering river of far-source rocks. The second phase of delta bedrock is characterized by mixing, Transitional product. The northward extension of the source region of the Enping Formation and the increase of the source area resulted in the enhancement of the supply of the delta provenance, which is one of the main reasons for the continuous development of the Enping Uplift Triangle in the northern slope of the Baiyun Sag. The grain composition of sandstone is an important factor to control the quality of deep reservoirs. The upper part of Enping Formation in Baiyun Sag has a higher content of feldspar in sandstone due to the change of parent rock, which possesses material conditions for developing a large number of secondary pores. However, deltaic distributary channel and The various sand bodies in the front are ideal favorable facies development facies, and the Upper Enning Formation in the northern part of Baiyun Sag possesses the potential of developing high-quality reservoirs.