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珠江口盆地恩平凹陷中浅层海相泥岩分布广泛,对油气封盖保存具有重要意义。通过对研究区宏观沉积背景的分析,认为盖层有效性体现于平面连续性和垂向封闭性,分别受控于泥岩厚度和突破压力,并影响油气的聚集规模。基于已知油气藏和盖层质量之间的关系,找出盖层保存油气的封堵下限,结合下限值将盖层分为一般盖层、有效盖层和高效盖层3类,并建立评价模型。应用模型评价北部古隆起带盖层质量表明,该带下珠江组及珠海组高效盖层数量较为接近,盖层质量基本相当;下韩江组及上珠江组盖层条件差异较大,该带东段高效泥岩盖层明显多于西段,且与南带油田群相当,其盖层条件优越;从油气保存的角度来看,该带东段分布的各类型目标具有一定勘探潜力。
The middle and shallow marine mudstones in the Enping Depression of the Pearl River Mouth Basin are widely distributed and are of great significance for the preservation of oil and gas. Through the analysis of macroscopic sedimentary background in the study area, it is considered that the validity of caprock is manifested in planar continuity and vertical sealing, which are controlled by mudstone thickness and breakthrough pressure, respectively, and affect the scale of oil and gas accumulation. Based on the relationship between the known oil and gas reservoir and the quality of the cover, the lower limit of oil and gas sealing in the cover is found, and the cover is divided into three types, ie general cover, effective cover and high cover, Evaluation model. The application of the model to evaluate the quality of the caprock in the northern paleohigh shows that the number of high-caprocks in the Zhujiang and Zhuhai formations is relatively close to each other and the quality of the caprocks is basically the same. The conditions of the lower Hanjiang Formation and the Upper Zhujiang Formation are quite different. The eastern part of the high-efficient mudstone caprock is obviously more than the western part, which is equivalent to the southern oilfield group and has favorable conditions of the caprock. From the point of hydrocarbon preservation, all kinds of targets distributed in the eastern part of the belt have certain exploration potential.