四川盆地长兴组、飞仙关组岩石物理实验及分析

发布时间：2019-03-29 10:44

【摘要】：四川盆地L地区飞仙关组、长兴组碳酸盐岩储层的岩性多样,孔隙结构复杂、非均质性强。测井响应特征复杂、测井解释多解性强,给储层流体识别和参数精确计算带来很大困难。针对目标区碳酸盐岩储层评价要求,论文以岩石物理实验为基础,通过岩样纵横波速度、核磁共振、岩电等实验测量,系统分析储层岩性、物性、电性及声学特征,用于分析碳酸盐岩储层孔隙结构微观特征,为弄清测井宏观响应特征和机理提供技术支持,为储层参数模型建立提供实验依据。薄片分析显示,地层孔隙空间类型多样,以溶蚀孔,粒间孔、溶蚀缝等为主,岩性以溶孔、裂缝较发育的白云岩为主。孔隙度、渗透率分布范围较大,孔渗关系较复杂,覆压孔隙度、渗透率实验表明,地层压力对孔、渗影响较小。基于核磁、压汞、薄片等实验结果,从孔隙尺度、喉道分布、孔隙发育类型出发,将孔隙结构分为四类,确定了不同孔隙结构类型划分标准,并结合T2截止值与不同层位,在上述基础上细分出七种孔隙结构。将岩电实验同孔隙结构结合,依据多重孔隙的组合特征阐释储层岩电关系的非阿尔奇现象,表明岩样偏离阿尔奇关系的变化趋势受到原生孔隙、溶蚀孔隙的双重作用。不同孔隙流体条件下的纵、横波速度实验表明,岩样声学特征随流体性质的变化明显,特别是含气饱和度增大使得岩样纵波速度减小明显,纵、横波速比差异减小明显,利用纵横波速度及相关岩石弹性参数评价储层的含气性可具有较好的应用效果。
[Abstract]:The carbonate reservoirs of Feixianguan formation and Changxing formation in L area of Sichuan Basin are diverse in lithology, complex in pore structure and strong in heterogeneity. It is difficult to identify reservoir fluid and accurately calculate reservoir parameters because of the complex characteristics of logging response and the multi-solution ability of log interpretation. According to the requirements of carbonate reservoir evaluation in the target area, based on the rock physics experiments, the lithology, physical properties, electrical properties and acoustic characteristics of the reservoirs are systematically analyzed through the experimental measurements of longitudinal and transverse wave velocity of rock samples, nuclear magnetic resonance (NMR) and rock electricity, etc. It is used to analyze the microscopic characteristics of pore structure of carbonate reservoir, to provide technical support for understanding the macroscopic response characteristics and mechanism of logging, and to provide experimental basis for the establishment of reservoir parameter model. The thin-slice analysis shows that the formation pore space types are varied, mainly solution pores, intergranular pores, dissolution fractures, etc. Lithology is mainly solution pores, and the fracture is more developed dolomite. Porosity and permeability distribution range is large, pore-permeability relationship is more complex, overpressure porosity. Permeability experiment shows that formation pressure has little effect on porosity and permeability. Based on the experimental results of nuclear magnetism, mercury pressure and thin slice, the pore structure is divided into four categories from pore size, throat distribution and pore development type, and the classification criteria of different pore structure types are determined, and combined with T _ 2 cut-off value and different layers, the pore structure is divided into four categories, and the T _ 2 cut-off value is combined with the different layers. On the basis of the above, seven kinds of pore structures are subdivided. Combining the petroelectric experiment with pore structure, the non-Archie phenomenon of reservoir rock-electricity relationship is explained according to the combination characteristics of multi-porosity. It is shown that the variation trend of rock sample deviating from Archie relation is affected by the dual action of primary pore and dissolved pore. P-wave and S-wave velocity experiments under different pore fluid conditions show that the acoustic characteristics of rock samples change obviously with the fluid properties, especially with the increase of gas saturation, P-wave velocity decreases obviously, P-P / S-wave velocity ratio decreases obviously, and the difference between P-wave velocity ratio and S-wave velocity ratio decreases obviously, especially with the increase of gas saturation. The use of P-S wave velocity and related rock elastic parameters can be used to evaluate the gas-bearing property of the reservoir, which has a good application effect.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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