大庆长垣表外储层分类评价

随着各大陆相油田勘探开发的不断深入,常规储层分类评价方法已经不能满足低渗特低渗储层的开发需要,本文以大庆长垣表外储层为研究对象,应用取心井物性及沉积等资料,采用地质统计法及相关系数法,对研究区表外储层进行分类评价。结果表明研究区表外储层受砂岩厚度和平面接触关系影响较大,因此将研究区表外储层分为决口泛滥型、变差嵌入型、延伸渐变型、稳定砂席型、独立零散型5种类型,决口泛滥型表外储层驱油效果最好,是表外储层开发的重点。

Classification and Evaluation of Untabulated Reservoir of Daqing Placanticline

With the further exploration and development of Daqing Placanticline oilfields in Songliao Basin, conventional reservoir classification and evaluation methods can no longer meet the development needs of low permeability and ultra-low permeability reservoirs. In this paper, the untabulated reservoir of Daqing placanticline is taken as the research object, and the physical properties and sedimentary data of coring wells are used to classify and evaluate the untabulated reservoir in the study area by using the methods of geological statistics and correlation coefficient. The results show that the untabulated reservoir in the study area are greatly affected by the thickness of sandstone and the plane contact relationship. Therefore, the untabulated reservoir in the study area can be divided into five types:burst flooding type, variation embedding type, extended gradual change type, stable sand mat type and independent scattered type. The flooding off-surface reservoir with crevasse has the best oil displacement effect and is the key point of untabulated reservoir development.