珠江口盆地白云凹陷北坡恩平组上段三角洲物源演化及储集意义

发布时间：2018-02-16 16:49

本文关键词： 物源分析白云凹陷恩平组沉积演化深部储层　出处：《天然气地球科学》2017年10期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:The delta coal measures of the upper member of the Enping formation on the northern slope of Baiyun depression in Pearl River mouth Basin and its associated continental source marine mudstone are the main hydrocarbon source series confirmed by exploration in this area. According to the seismic profile and drilling data, The delta can be divided into three periods. The REE combined with the regional basement lithologic characteristics indicates that the source region of the delta in the first stage of the upper part of the Enping formation is Panyu low uplift, and the source river shows the characteristics of the braided river near the provenance, the late sedimentary stage of the Enping formation, and the late sedimentary stage of the Enping formation. Enping depression is connected with Baiyun Sag. The delta provenance of the third stage of the upper member of the Enping formation is mainly the northern uplift area. The source river shows the characteristics of the meandering stream from the far source, and the delta parent rock of the second stage shows the mixed characteristics. The northward migration of the provenance region and the expansion of the supply area in the late Enping formation resulted in the enhancement of the provenance supply in the delta. This is one of the main reasons for the continuous development of the prograde delta of the Enping formation on the northern slope of Baiyun Sag. The grain composition of sandstone is an important factor to control the quality of deep reservoir. The upper member of the Enping formation in Baiyun sag has a high feldspar content in sandstone due to the change of parent rock, which has the material condition of developing a large number of secondary pores. The delta distributary channel and all kinds of sand bodies in the front edge of delta distributary channel are ideal favorable reservoir development facies zone. The upper member of the Enping formation in the northern Baiyun sag has the potential to develop high quality reservoirs.
【作者单位】：中海油研究总院;
【基金】：国家科技重大专项“南海深水区油气资源潜力与大中型油气田勘探方向”(编号:2017ZX05026-007) 国家自然科学基金“南海深海地质演变对油气资源的控制作用”(编号:91528303)联合资助
【分类号】：P618.13

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