新疆雅克拉断凸下古生界碳酸盐岩储层特征

Characteristics of Lower Paleozoic carbonate reservoir in Yakela faulted upward,Xinjiang

新疆雅克拉油气田具有多套含油层系,其中下古生界碳酸盐岩也是重要储层之一。过去由于研究手段和方法上的限制,对于这套储层缺乏深入认识,给碳酸盐岩的勘探开发工作带来了一定的难度。为了搞清这一问题,充分利用了钻井、录井、测井、地震、岩心薄片和分析化验资料,并进行了高分辨率测井约束地震反演。通过综合分析和新技术的应用,对雅克拉油气田碳酸岩储层的纵、横向的展布特征有了比较明确的认识。确定了有利的储集相带主要发育在潮坪和台滩微相中,受后期改造作用,分布在构造较高部位,可作为碳酸盐油气藏勘探的主攻方向。

There are numbers of oil-bearing formations in Yakela oilfield, Xinjiang. Among them, the Lower Paleozoic carbonate formation is one of the important reservoirs. Due to the limitation of means and methods in previous investigations, the lack of thorough recog- nition of the reservoir caused the exploration and development of the carbonate formation to be some difficult. To resolve this problem, we carried out high resolution logging-restr- ained seismic inversions by fully using drilling, mud logging, seismic, core slice and chemical analysis data. Basing on the comprehensive analysis and application of new techno- logy, an explicit understanding of vertical and horizontal extensions of the carbonate reservoir in the Yakela oilfield has been obtained. The favorable reservoir facies belts are generally developed in the tidal flat and shoal facies and distributed in the structural high positions due to later reformation, where can be selected as the main direction of exploration of carbonate reservoirs.