南堡3号构造寒武系潜山卡层探讨

Horizon determination for Nanpu No.3 structure in Cambrian buried hill

卡准潜山界面,将技套坐入潜山,是保证潜山油气藏顺利钻探的重要环节。本文简述了南堡3号构造潜山卡层时常见的影响因素及相应对策;力图通过邻区南堡2号构造奥陶系潜山和唐海油田寒武系潜山卡层的方法,利用碳酸盐含量分析和元素录井两种技术手段,消除古近系、寒武系徐庄组薄夹层灰岩对潜山卡层的影响,从而卡准潜山界面。同时,本文提出了寒武系徐庄组中完的可行性,在钻探安全方面可作为抛砖引玉之用。

Accurately determining the interface of buried hill and setting the intermediate casing into the buried hill are important parts of ensuring a smooth drilling in buried hill reservoirs.The paper described the common influence factors and corresponding countermeasures when determining the buried hill horizons of Nanpu No.3 structure,the interface of buried hill was tried to accurately determined by using the horizon determination methods of Ordovician buried hill of Nanpu No.2 structure in adjacent area and Cambrian buried hill in Tanghai Oilfield and two techniques of carbonate content analysis and element logging to eliminate the influence of thin layer of limestone of Xuzhuang formation in Paleogene and Cambrian systems on horizon determination in the buried hill,thus realizing accurately determining the interface of the buried hill.Meanwhile,this paper presented the feasibility of drill stem test in Xuzhuang formation of Cambrian system,it can be used as reference in drilling safety.