萨北一、二排高台子油层加密调整研究

发布时间：2018-07-15 16:59

【摘要】：萨中开发区位于萨尔图背斜构造中部,呈西陡、东缓、中部比较平坦的形态,是大庆长垣北部的一个局部构造。油藏精细描述发现,全区共有断层82条,绝大多数断层在构造的轴部和西翼发育,且均为正断层,多为北西、北北西方向延伸。其中,北一、二排西部位于萨尔图背斜构造西翼北部,落实到高一油层组顶构造图上,共发育11条断层。研究表明,所研究区块油层最初形成时由于地壳上升,水域不断缩小,海(湖)岸线向海洋(湖心)一侧退缩,因此一层砂石,一层泥相互交织沉积形成了三角洲-陆地河流形态,该层段组成是白垩系。在油层孔渗特征上,总体表现为随渗透率增大,平均孔隙半径和半径中值增大的特点。沉积相上表现为三角洲前缘相沉积,主要以外前缘相沉积为主,其砂体粒度细、泥质和钙含量高、油层物性较差。非均质性上,整体表现为韵律段间差异、层间渗透率差异较小,平面上砂体发育较稳定,连续性较好,油层相对较均质。采用容积法对储量进行了精确计算,结果表明,北一、二排西部高台子油层地质储量为1372.1×104t,其中表内油层地质储量为825.1×104t,表外油层地质储量为448.5×104t,油水同层地质储量为98.5×104t。随着油田开发的深入,北一、二排西部高台子油层开发矛盾越来越突出,集中体现在:一是现阶段在高台子油层所布的井网分属不同时期,不同组合,统一调整工作比较复杂;二是对于注水量需求较大,目前的注水井满足不了生产需要,这也造成许多油井产液量严重不足;三是采油井中高台子和萨葡油层不分层开采会形成严重的层间干扰,使得高台子油层受到影响而降低产液量。因此需要通过加密调整来改善开发效果。按照“整体研究、统一部署、细分层系、缩小井距”的原则设计高台子油层加密井网,以期达到减缓油层产量递减速度,改善油层开发效果,提高油层采收率的目的。最终确定五点法面积井网开发高台子油层,注采井数比确定为1:1.33更加合理。
[Abstract]:Sazhong Development Zone, located in the middle of Saltu anticline, is a local structure in the north of Daqing Placanticline. The detailed description of the reservoir shows that there are 82 faults in the whole area, most of which are developed in the axis and the western wing of the structure, and they are normal faults, most of which are north west, north west and north west extending. The north and west of the first and second rows are located in the north of the western wing of the Saltu anticline, and 11 faults have been developed on the top structural map of the Gaoyi formation. The study shows that when the oil layer of the block in question initially formed, because the crust was rising and the waters were shrinking, the shoreline of the sea (lake) retreated to the side of the ocean (the center of the lake), so it was a layer of sand and stone. A layer of mud interweaves to form a delta-land river form, which is composed of Cretaceous. The characteristics of porosity and permeability in reservoir are as follows: with the increase of permeability, the mean pore radius and median radius increase. The sedimentary facies are delta front facies, mainly outer front facies, with fine grain size of sand body, high content of mud and calcium, and poor physical properties of reservoir. In terms of heterogeneity, the overall performance is the difference between rhythmic segments, the difference of interlayer permeability is small, the development of sand body on the plane is more stable, the continuity is better, and the reservoir is relatively homogeneous. The volume method is used to accurately calculate the reserves. The results show that the geological reserves of the Gaotaizi reservoir in the first and second rows of North China are 1372.1 脳 10 ~ 4t, in which the geologic reserves of the oil layers in the surface are 825.1 脳 10 ~ 4t, the geological reserves of the oil reservoirs off the surface are 448.5 脳 10 ~ 4t, and the geological reserves of the same oil and water layers are 98.5 脳 10 ~ 4t. With the development of oil field, the contradiction of the development of Gaotaizi reservoir in the first and second rows of North China has become more and more prominent, which is embodied in the following aspects: firstly, the well pattern distributed in Gaotaizi reservoir belongs to different periods at the present stage, different combinations, and the unified adjustment work is more complicated; Second, there is a large demand for water injection, and the current water injection wells cannot meet the production needs, which also results in a serious shortage of liquid production in many wells; third, the unstratified production of Gao Taizi and Sapu reservoirs in the production wells will result in serious interlayer interference. The formation of Gaotaizi oil is affected and the liquid production is reduced. Therefore, encryption adjustment is needed to improve the development effect. According to the principle of "overall research, unified deployment, subdivision of strata, and reduction of well spacing", the infill well pattern of high Taizi reservoir is designed in order to slow down the rate of production decline, improve the effect of reservoir development and increase oil recovery. Finally, it is more reasonable to determine the number of injection-production wells to be 1: 1.33 for the development of Gaotaizi reservoir with five-point area pattern.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE34

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