基于多尺度的碳酸盐岩裂缝预测研究

发布时间：2018-05-12 22:40

本文选题：红外光谱 + 包裹体　；参考：《中国石油大学(华东)》2015年硕士论文

【摘要】：现如今裂缝性油藏在油气藏发现中所占的比例逐渐增大,储量和产量比例也逐渐上升,人们研究的重点逐渐从构造圈闭油藏向非常规油藏倾斜,储层裂缝不但是油藏中流体的运移通道,同时也是油气良好的储集空间,因此它对于油藏产量的提高具有十分重要的意义,对于裂缝预测的研究已经成为了科学分析领域里的热点课题。对于储层裂缝的研究很复杂,是一个系统工程,在单一尺度上不能更好地表述裂缝在油藏中的特性,因此,需要从多尺度的角度对裂缝进行分析。本课题将红外光谱成像与多尺度分析结合起来,应用红外光谱技术对裂缝微观特征进行研究,判断碳酸盐岩裂缝微观特性下的有效性和形成期次,应用测井资料和地质信息对油藏区域进行碳酸盐岩裂缝预测研究,对裂缝发育程度的分布做出预测。研究结果表明:(1)该研究区域中岩心内含有有机烃类化合物和流体包裹体,储层裂缝主要存在于白云岩介质中,裂缝中烷烃有机物的充填程度较小为26.014%,盐水包裹体所占比例较大为51.691%。岩心裂缝属于大裂缝,裂缝的有效性较好。(2)研究区潜山主要有两个油气裂缝形成期:一为东营组沉积晚期到明化镇组沉积中期、二为始新统沙三段到渐新统沙二段沉积期。(3)通过数值模拟计算得出,该雾迷山组油藏区域地层地层中的应力值大体分布在36~80MPa之间。区域断层内部应力值较连续地层小,井点最大主应力方向为北偏东,角度值分布较为均匀。(4)断层内部、相邻断层过渡区域发育指数较大,为裂缝发育区域。研究区域地层西南方向发育指数大于0.8,属于裂缝较发育区域。东北端主断层处存在一段颜色较浅区域,该区域属于裂缝欠发育处。剩余地区包括东南部和西北部等地均属于裂缝轻微发育区域。断层边缘处等值线变化快,裂缝分布受到岩层应力释放的影响成区块分布。比较裂缝发育指数等值线图与井点分布图,在断层临近区域和西南、东南方向等裂缝破裂较大的地区,其井点分布较密集,其余地域井点分布较稀疏,对于储层裂缝发育区域预测的研究与井点的分布相互吻合,证明本文研究得出的结论符合实际工程情况。
[Abstract]:Nowadays, the proportion of fractured reservoirs in the discovery of oil and gas reservoirs is gradually increasing, and the proportion of reserves and production is also gradually rising. The focus of people's studies is gradually tilting from structural traps to unconventional reservoirs. Reservoir fracture is not only the migration passage of fluid in the reservoir, but also a good reservoir space for oil and gas, so it is of great significance for the improvement of reservoir production. The research on fracture prediction has become a hot topic in the field of scientific analysis. The study of reservoir fractures is very complex and is a systematic engineering, which can not better describe the characteristics of fractures in reservoirs on a single scale. Therefore, it is necessary to analyze fractures from the perspective of multiple scales. In this paper, infrared spectral imaging and multi-scale analysis are combined to study the microscopic characteristics of fractures, and to judge the validity and formation period of carbonate fractures. Well logging data and geological information are used to predict the fracture of carbonate rock in reservoir area, and the distribution of fracture development degree is predicted. The results show that the core of the study area contains organic hydrocarbon compounds and fluid inclusions, and the reservoir fractures mainly exist in dolomite media. The filling degree of alkane organic matter in fracture is 26.014 and the proportion of brine inclusion is 51.691. The core fractures belong to large fractures, and the validity of fractures is good. (2) there are mainly two oil and gas fractures in buried hills in the study area: one is the late sedimentary period of Dongying formation to the middle sedimentary period of Minghuazhen formation, The second is the sedimentary period from the third member of the Eocene to the second member of the Sha member of the Oligocene. By numerical simulation, it is concluded that the stress values in the regional formation of the Wumishan formation are roughly distributed between 36~80MPa. The stress value of the regional fault is smaller than that of the continuous formation, the direction of the maximum principal stress of the well point is east-north, the angle value distribution is more uniform, and the development index of the adjacent fault transition region is larger, which is the fracture development area. The development index of the southwest direction of strata is greater than 0.8, which belongs to the area where the fractures are relatively developed. There is a light color area at the main fault at the northeast end, which belongs to the underdeveloped fracture. The remaining areas, including the southeast and northwest, belong to the area of slight crack development. The distribution of fractures is affected by the stress release of strata into blocks. Comparing the contour map of fracture development index with that of well point distribution, the well point distribution is denser in the area adjacent to the fault and in the southwest and southeast, and the distribution of the other well points is relatively sparse. The prediction of reservoir fracture development area coincides with the distribution of well point, which proves that the conclusion obtained in this paper is in line with the actual engineering situation.
【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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