XX油田水淹层导电规律实验研究及水淹层评价方法

发布时间：2018-06-26 13:11

  本文选题：储层分类 + 水淹机理　； 参考：《东北石油大学》2017年硕士论文

【摘要】：XX油田大404井区主要目的层是处于上白垩统时期,位于姚家组位置的葡萄花油层,具体地质特征是三角洲前缘亚相沉积,蕴藏非常丰富的油气资源,但是开采难度较大。此油藏被归类为低渗透裂缝型砂岩油藏,主要存在以下特点:岩性发育较差,内部构造较为复杂以及油井受效性弱等。因此为了创建安全的开发环境,为其实施加密与注采系统调整提供依据,进行了水淹层导电规律实验研究及水淹层评价方法研究。以储层分类分析研究为基础,从水淹层导电机理入手,系统分析水淹过程中电阻率变化规律和不同类型储层岩石物理参数变化规律,分类建立了水淹层解释图版和评价标准。研究了超前注水孔隙内流体压力变化对低渗透储层物性和驱油效率的变化。结论认为:(1)通过储层岩石物理相划分,将XX油田葡萄花油层划分为4类,对不同储层岩石孔隙度-渗透率求取模型进行改进,能够极其有效地解决中低渗储层所出现的非均质性问题。(2)通过水淹机理的实验研究,掌握了不同储层岩石处于水淹状态下的电阻率变化规律。同时利用多元线性回归方法以及应用交会图技术,以此来处理低渗透储层水淹层的问题,进而全面提升水淹层解释的正确性。(3)采用超前注水的手段,能够在一定程度上极大地增加储层压力,进而降低渗透率,使岩层更加稳固。(4)随着净应力的增加,孔隙流体压力的逐渐降低,驱油效率逐渐降低。相反,随着净压力减小,孔隙流体压力的逐渐增加,驱油效率逐渐增加。与渗透率敏感实验变化趋势相同。孔隙流体压力上升初期驱油效率增加幅度较大,随着孔隙流体压力的进一步增加,驱油效率增加幅度变小。
[Abstract]:The main target layer of Da-404 well area in XX Oilfield is the Putaohua oil layer located in the upper Cretaceous and the position of Yao Jia formation. The specific geological characteristics are delta front subfacies sedimentary, which contains very rich oil and gas resources, but the exploitation is difficult. This reservoir is classified as a low permeability fractured sandstone reservoir with the following characteristics: poor lithologic development, complex internal structure and weak oil well effectiveness. Therefore, in order to create a safe development environment and provide the basis for the adjustment of the infill and injection-production system, the experimental study on the electric conductivity law of the water-flooded layer and the evaluation method of the water-flooded layer are carried out. Based on the study of reservoir classification and analysis, the regularity of resistivity variation and rock physical parameters of different types of reservoirs during waterflooding are systematically analyzed, and the interpretation chart and evaluation standard of water-flooded layer are established. The change of fluid pressure in the pore of water injection on the physical properties and oil displacement efficiency of low permeability reservoir is studied. The conclusions are as follows: (1) according to the physical phase division of reservoir rock, Gaohua reservoir in XX oilfield is divided into 4 types, and the model of porosity and permeability of different reservoir rock is improved. It can solve the heterogeneity problem of low and low permeability reservoir very effectively. (2) through the experimental study of water-flooded mechanism, the law of resistivity variation of different reservoir rock in water-flooded state is mastered. At the same time, the multivariate linear regression method and cross plot technique are used to deal with the problem of water-flooded layer in low permeability reservoir, and the correctness of water-flooded layer interpretation is improved. (3) the method of advanced water injection is adopted. It can greatly increase the reservoir pressure to a certain extent, and then reduce the permeability and make the rock formation more stable. (4) with the increase of net stress, the pore fluid pressure decreases gradually, and the oil displacement efficiency decreases gradually. On the contrary, with the decrease of net pressure and the increase of pore fluid pressure, the displacement efficiency increases gradually. The change trend is the same as the permeability sensitive experiment. The oil displacement efficiency increases greatly at the initial stage of pore fluid pressure rise, and decreases with the further increase of pore fluid pressure.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE31
，

本文编号：2070485