封盖油气的盖壳

发布时间：2018-02-04 05:15

本文关键词： 盖层盖壳气水倒置油水倒置表生成岩作用地层层序界面　出处：《油气地质与采收率》2017年06期 　论文类型：期刊论文

【摘要】：油气的封盖有2种类型:一种是众所周知的盖层,另一种是笔者所论证的盖壳。盖壳是某一级次的地层层序界面。地层层序界面是沉积的间断。接受新的沉积之前,在出露或接近地表的沉积间断面上发生表生成岩作用,形成钙结壳和渗流充填物等,堵塞了表层的孔隙和喉道,降低了表层的渗透率。大港油区港225井馆陶组和明化镇组之间地层层序界面上的含钙粉砂岩的渗透率为0.63 mD,但其上、下储层的渗透率为数百、数千毫达西。中国港东、辽河油田的主力油藏以及加拿大Elmworth气田、巴基斯坦Naimat气田的主力气藏的顶界均为地层层序界面。在这些油藏、气藏顶界之上覆盖的并不是泥、页岩盖层,而是渗透性砂岩、水层。看似奇特的油水倒置、气水倒置,实际是上部的水层与下部的油(气)层被不渗透的地层层序界面所分隔。将水层与油(气)层分隔开的地层层序界面即为封盖油气的盖壳,其厚度很薄,但对于封盖油气具有重大意义,中外多个大型油(气)藏均为盖壳封盖。
[Abstract]:There are two types of seals for oil and gas: one is known as a cap. The other is the cover shell, which is a stratigraphic sequence interface of a certain order. The stratigraphic sequence interface is a sedimentary discontinuity. On the surface of the sedimentary discontinuity, the formation of calcium crusts and percolation fillings has blocked the pores and throats of the surface layer. The permeability of calcium bearing siltstone at the stratigraphic sequence interface between Guantao formation and Minghuazhen formation in Port 225 in Dagang oil area is 0.63 mD. but the permeability of upper and lower reservoirs is several hundred. Thousands of mordassi. East China, the main reservoir in Liaohe oil field and Elmworth gas field in Canada. The top boundary of the main gas reservoir in Naimat gas field in Pakistan is stratigraphic sequence interface. In these reservoirs, the top boundary of the gas reservoir is not covered by mud, shale caprock, but permeable sandstone. Water layer. Seemingly strange oil and water inversion, gas and water inversion. In fact, the upper water layer and the lower oil (gas) layer are separated by the impermeable stratigraphic sequence interface. The stratigraphic sequence interface that separates the water layer and the oil (gas) layer is the cap shell of sealing oil and gas, and its thickness is very thin. However, it is of great significance to seal oil and gas, and many large oil (gas) reservoirs in China and abroad are capped.
【作者单位】：中国石油勘探开发研究院;
【分类号】：P618.13
【正文快照】： 笔者在分析大港、辽河、大庆和塔里木等油区主要油藏顶界封堵条件的过程中,并未发现泥、页岩和膏盐岩等通常意义上的盖层。究竟是什么在封盖油气?请看以下试油测试、地层对比以及岩心分析3个方面的实际资料。1试油测试证实的油水倒置、气水倒置现象港东油田过港1-24-1—港5-34

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