姬塬油田盐67区长8储层连通性研究

发布时间：2018-05-25 09:31

本文选题：沉积微相 + 储层特征　；参考：《西安石油大学》2015年硕士论文

【摘要】：盐67区位于鄂尔多斯盆地陕北斜坡中段姬塬油田。该区长8储层于2012年5月投产,实行了超前注水政策,但是开发初期产量递减较快,提高注水强度后没有明显见效迹象,而且在开发过程中,注水压力不断升高,出现了高压欠注的问题。为了制定一套合理的注水稳产方案,必须对其储层特征及井间连通性进行研究。本文首先通过岩心分析及测井资料,结合前人的研究成果对研究区长8储层小层进行了划分,并对沉积微相、储层特征及非均质性进行了研究,在此基础上对研究区长8储层进行了注采井间砂体连通性的研究,并结合射孔资料,通过油层连通栅状图,井组水驱控制程度及连通阻力系数对研究区长8储层注采井间静态连通性进行了定性和定量描述。通过注采生产动态数据反演连通性的两种方法计算了各注采井间的连通系数,分析对比了两种方法得出的连通系数,对其归一化,作为动态连通系数来定量描述注采井间的动态连通程度,最后对影响井间连通性的因素及改善措施进行了分析。在井间连通性研究的基础上,结合生产动态曲线,以井组为单位进行了注采关系精细描述,并提出针对性的建议和措施。通过系统地研究,取得如下认识:研究区长8储层静态连通性较好,但是动态连通性整体较差,其主要是由于储层自身物性较差及地层堵塞所致。储层连通性差、注采不完善及储层非均质性导致的吸水剖面不均,是造成注水见效不明显,注水压力升高的主要因素。
[Abstract]:Yan67 area is located in Jiyuan oil field in the middle section of northern Shaanxi slope in Ordos Basin. The Chang 8 reservoir in this district was put into production in May 2012, and implemented the policy of ahead water injection, but the production decreased rapidly in the initial stage of development, and there was no obvious sign of effect after increasing the water injection intensity, and the water injection pressure was rising continuously during the development process. There is a problem of high pressure underinjection. In order to make a reasonable water injection stable production plan, it is necessary to study the reservoir characteristics and inter-well connectivity. In this paper, the core analysis and logging data are used to divide the Chang 8 reservoir layers in the study area, and the sedimentary microfacies, reservoir characteristics and heterogeneity are studied. On the basis of this, the connectivity of sand body between injection-production wells in Chang8 reservoir is studied, and combined with perforation data, the connected grid diagram of oil layer is adopted. The static connectivity between injection and production wells in Chang8 reservoir is described qualitatively and quantitatively by the control degree of water drive and the coefficient of connectivity. Through two methods of inversion connectivity of injection-production dynamic data, the connectivity coefficient of each injection-production well is calculated, the connectivity coefficient obtained by the two methods is analyzed and compared, and the connectivity coefficient is normalized. As a dynamic connectivity coefficient, the dynamic connectivity between injection-production wells is quantitatively described. Finally, the factors affecting inter-well connectivity and the improvement measures are analyzed. On the basis of the research of inter-well connectivity and combined with the production dynamic curve, the injection-production relationship is described in detail by taking the well group as the unit, and the corresponding suggestions and measures are put forward. Through systematic research, the following conclusions are obtained: the static connectivity of Chang8 reservoir is good, but the dynamic connectivity is poor as a whole, which is mainly caused by the poor physical properties of the reservoir itself and the formation plugging. Poor reservoir connectivity, imperfect injection-production and uneven water absorption profile due to reservoir heterogeneity are the main factors that cause the water injection effect is not obvious and the water injection pressure increases.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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