辽河油田曙一区杜84块兴Ⅰ组隔夹层研究

发布时间：2018-05-20 22:41

  本文选题：曙一区 + 蒸汽吞吐　； 参考：《浙江大学》2015年硕士论文

【摘要】：辽河油田曙一区位于辽河盆地西部凹陷西斜坡中段,开发目的层为新生界下第三系沙河街组兴隆台油层,共分四个油层组,为超稠油油藏,采用蒸汽吞吐开发方式开采。后期面对蒸汽吞吐开发方式的吞吐轮次高、周期产量下降、单井操作成本高等问题,为提高油藏采收率,杜84块兴Ⅰ组油藏实施方式转换,采用SAGD(蒸汽辅助重力泄油的英文首字母缩写)开发方式开发,共规划31个双水平SAGD井组,先期转入4个先导试验井组,但受隔夹层发育的影响,生产效果差,一直未达到方案设计指标。为解决关键问题-隔夹层发育对开发效果的问题,作者运用了层序地层学等先进理论和储层精细描述和油藏数值模拟的一些新技术,其中包括：地层精细对比技术、微构造研究技术、测井二次解释技术、三维建模技术、数值模拟技术及剩余油分布综合研究技术。首先运用层序地层学理论,通过对比剖面完成地层对比；根据韵律性特征及岩性、电性将兴Ⅰ组地层划分成兴Ⅰ1、兴Ⅰ2、兴Ⅰ3、兴Ⅰ4、共4个小层,完成单层级别的砂体对比研究；基于地层对比结果,确定研究区区域构造特征；在分析关键性四性关系的基础上,完成研究区300余口井的测井二次解释工作,建立了泥质含量、孔隙度、渗透率、饱和度模型；对有效厚度进行单砂体级别的二次解释；在储层精细描述的基础上,结合生产动态资料,确定了油藏参数；在构造、岩性和储层砂体精细表征的基础上,应用条件模拟的方法,建立了杜84块兴Ⅰ组含砾砂岩段储层精细的三维地质模型；最后对比泥质夹层模型与无夹层模型的开发效果,泥质夹层的存在对蒸汽腔的发育有明显影响,进而影响开发效果。曙一区兴Ⅰ组油藏是西部凹陷油气生产的重要目标区,随着SAGD开发的深入,石油工作者认识到,隔夹层发育对SAGD开发效果具有重要影响。因此,本文在落实隔夹层发育的基础上,认识隔夹层对SAGD开发效果的影响,并提出改造措施,达到改善已转井组生产效果及保持待转井组顺利转入的目的,为油田稳定提供有利保障。综上所述,为了解决本区隔夹层影响生产效果的问题,作者把传统的地质方法和先进的数值模拟方法相结合,预测了井间隔夹层的展布,找到影响开发效果的原因,圆满地解决了问题。
[Abstract]:Shu1 area of Liaohe oilfield is located in the middle section of west slope of western depression of Liaohe basin. The development target layer is Xinglongtai reservoir of Shahejie formation of Neozoic Lower Tertiary system, which is divided into four reservoirs, which are super heavy oil reservoirs and are exploited by steam huff and puff development. In the later stage, the development mode of steam huff and puff is high, the cycle production is decreased, the operating cost of single well is high. In order to improve the oil recovery, the reservoir mode of XingI formation in block du 84 is changed. The development method of sag (Steam assisted Gravity drain) is used to develop 31 double-level SAGD well groups, which are transferred to 4 pilot test wells in advance. However, due to the development of intercalation, the production effect is poor. The project design target has not been met. In order to solve the key problem of the development of intercalation, the author applies advanced theories such as sequence stratigraphy and some new techniques of fine reservoir description and reservoir numerical simulation, including fine stratigraphic correlation. Microstructural research technology, logging secondary interpretation technology, three-dimensional modeling technology, numerical simulation technology and remaining oil distribution comprehensive research technology. Firstly, stratigraphic correlation is accomplished by correlation section by using sequence stratigraphy theory, and according to rhythmic characteristics and lithology, the formation of Xing I is divided into four sublayers, Xing鈪，

本文编号：1916581