發(fā)布時(shí)間：2018-02-04 05:15

  本文關(guān)鍵詞： 蓋層 蓋殼 氣水倒置 油水倒置 表生成巖作用 地層層序界面　出處：《油氣地質(zhì)與采收率》2017年06期 　論文類型：期刊論文

【摘要】：油氣的封蓋有2種類型:一種是眾所周知的蓋層,另一種是筆者所論證的蓋殼。蓋殼是某一級(jí)次的地層層序界面。地層層序界面是沉積的間斷。接受新的沉積之前,在出露或接近地表的沉積間斷面上發(fā)生表生成巖作用,形成鈣結(jié)殼和滲流充填物等,堵塞了表層的孔隙和喉道,降低了表層的滲透率。大港油區(qū)港225井館陶組和明化鎮(zhèn)組之間地層層序界面上的含鈣粉砂巖的滲透率為0.63 mD,但其上、下儲(chǔ)層的滲透率為數(shù)百、數(shù)千毫達(dá)西。中國(guó)港東、遼河油田的主力油藏以及加拿大Elmworth氣田、巴基斯坦Naimat氣田的主力氣藏的頂界均為地層層序界面。在這些油藏、氣藏頂界之上覆蓋的并不是泥、頁(yè)巖蓋層,而是滲透性砂巖、水層�？此破嫣氐挠退怪�、氣水倒置,實(shí)際是上部的水層與下部的油(氣)層被不滲透的地層層序界面所分隔。將水層與油(氣)層分隔開(kāi)的地層層序界面即為封蓋油氣的蓋殼,其厚度很薄,但對(duì)于封蓋油氣具有重大意義,中外多個(gè)大型油(氣)藏均為蓋殼封蓋。
[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.
【作者單位】： 中國(guó)石油勘探開(kāi)發(fā)研究院;
【分類號(hào)】：P618.13
【正文快照】： 筆者在分析大港、遼河、大慶和塔里木等油區(qū)主要油藏頂界封堵條件的過(guò)程中,并未發(fā)現(xiàn)泥、頁(yè)巖和膏鹽巖等通常意義上的蓋層。究竟是什么在封蓋油氣?請(qǐng)看以下試油測(cè)試、地層對(duì)比以及巖心分析3個(gè)方面的實(shí)際資料。1試油測(cè)試證實(shí)的油水倒置、氣水倒置現(xiàn)象港東油田過(guò)港1-24-1—港5-34

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