页岩气储层双侧向测井有限元正演模拟研究

发布时间：2018-05-05 11:45

本文选题：页岩气储层 + 双侧向测井　；参考：《中国地质大学(北京)》2015年硕士论文

【摘要】：页岩气是一种非常重要的非常规能源,对于缓解我国的能源压力,保障我国的能源安全方面有着重要的作用。我国页岩气储量较为丰富,主要分布在南方地区的海相页岩中,由于南方地表条件以及地质情况较为复杂,所以常规的地震勘探方法效果并不理想。储层评价的重要参数之一就是电阻率,电法测井是一种能够探测地层电阻率差异的地球物理方法,在油气资源勘探中发挥着重要的作用。双侧向测井是一种具有浅侧向和深侧向两种工作模式的电法测井方法,该方法在井中测量两种模式下的视电阻率分布情况,利用正演模拟和反演技术来研究页岩气储层油气水层的分布特征。本文首先简要介绍了双侧向测井的基本原理及其发展研究现状,推导出了基于稳定电流场的双侧向测井变分问题,然后用C/C++语言实现了双侧向测井有限元正演数值模拟程序,在求解有限元形成的线性方程组的过程中,采用了预处理共轭梯度算法以及压缩矩阵存储法,节省了计算机的存储空间,并且根据解预处理共轭梯度算法的特点,利用GPU显卡多线程编程技术,在CUDA平台上实现了GPU并行优化,极大地提高了程序运行速度,最后研究了不同地层模型对双侧向正演模拟响应的影响。在总结前人资料的基础上,建立了不同的页岩气储层模型,分别分析了井径,侵入带,泥浆,地层厚度等不同地层参数对双侧向正演响应的影响,结果表明双侧向测井对于地层厚度大于1m的地层分辨较好,当井径大于0.4m时,浅侧向模拟结果无法反应地层的特征,当侵入深度大于1m时,双侧向测井无法反映出地层的特性。最后,根据四川地区页岩储层物性特征,建立了多层的碳质页岩储层模型,研究表明:双侧向测井能够较好区分低阻碳质页岩薄层,并且也能识别多套页岩气储层。
[Abstract]:Shale gas is a very important unconventional energy, which plays an important role in relieving the energy pressure and ensuring the energy security in China. There are abundant shale gas reserves in China, mainly distributed in marine shale in southern China. Due to the complexity of surface conditions and geological conditions in southern China, the conventional seismic exploration methods are not satisfactory. Resistivity is one of the important parameters of reservoir evaluation. Electrical logging is a geophysical method which can detect the difference of formation resistivity and plays an important role in oil and gas exploration. Dual lateral logging is a kind of electric logging method with two working modes of shallow lateral and deep lateral. This method measures the distribution of apparent resistivity in wells under two modes. Forward modeling and inversion techniques are used to study the distribution characteristics of oil, gas and water layers in shale gas reservoirs. In this paper, the basic principle and development status of dual lateral logging are briefly introduced, the variational problem of dual lateral logging based on steady current field is deduced, and the forward numerical simulation program of double lateral logging is realized by using C / C language. In the process of solving the linear equations formed by the finite element method, the preprocessing conjugate gradient algorithm and the compression matrix storage method are used to save the storage space of the computer, and according to the characteristics of the solution preprocessing conjugate gradient algorithm, Using the multithread programming technology of GPU graphics card, the parallel optimization of GPU is realized on the CUDA platform, which greatly improves the running speed of the program. Finally, the influence of different stratigraphic models on the response of the double-lateral forward simulation is studied. On the basis of summarizing the previous data, different shale gas reservoir models are established, and the effects of different formation parameters, such as well diameter, intrusive zone, mud and formation thickness, on the dual lateral forward response are analyzed respectively. The results show that dual lateral logging is better for the formation with formation thickness greater than 1m. When the diameter is greater than 0.4 m, the shallow lateral simulation results can not reflect the formation characteristics, and when the invasion depth is more than 1m, the dual lateral logging can not reflect the formation characteristics. Finally, according to the physical characteristics of shale reservoir in Sichuan area, a multi-layer carbon shale reservoir model is established. The results show that dual lateral logging can distinguish the low resistivity carbonaceous shale thin layer and identify multiple sets of shale gas reservoirs.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13;P631.81

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