骨架导电泥质砂岩频散特性实验研究

发布时间：2019-05-05 19:52

【摘要】：随着油气勘探开发工作的日趋深入,勘探开发目标已由原来简单的高幅度构造油气藏逐渐转向低孔低渗、低电阻率、复杂岩性和复杂储集空间等复杂油气藏。低阻油层已成为油田增储上产的一个主要来源之一。由于低阻油层成因类型多样,而骨架导电又是低阻油层的主要成因之一,所以针对含导电矿物地层的导电规律的研究对油气藏开发存在一定的指导作用。本文设计与压制了12块不同黄铁矿含量、不同泥质含量的人造岩样。并利用该组岩样在不同频率下的不同含水饱和度岩电实验数据、不同频率下的不同地层水矿化度岩电实验数据,结合该组岩样的X衍射全岩定量分析实验数据。分析与研究了频率对骨架导电泥质砂岩地层的导电规律的影响。研究结果表明:(1)黄铁矿颗粒与泥质颗粒均具有频散特性;(2)随着电流频率的增大,岩样的同相电导率逐渐增大;基于骨架导电泥质砂岩岩样的频散特性实验研究成果,结合有效介质导电理论,将地层划分为导电的骨架颗粒、不导电的骨架颗粒、泥质、油气和水共5组分,建立骨架导电泥质砂岩有效介质电阻率频散模型,并分析黄铁矿含量、黄铁矿电导率、泥质含量以及泥质电导率等参数变化对模型预测的骨架导电泥质砂岩频散特性的影响。随后,利用电流频率范围在1KHz和20KHz下的含油气岩石电阻率实部数据,采用最优化技术确定骨架导电泥质砂岩有效介质电阻率频散模型中的未知参数。模型与实验数据的拟合精度较高,说明本文建立的骨架导电泥质砂岩有效介质电阻率频散模型能够描述骨架导电泥质砂岩地层的频散特性。最后,选择多种实际测井中应用的电流频率,利用骨架导电泥质砂岩有效介质电阻率频散模型,建立不同黄铁矿含量的骨架导电泥质砂岩频率影响校正图版。并给出了利用该图版校正受黄铁矿含量影响的高频电阻率测井视电阻率值的方法。
[Abstract]:With the deepening of oil and gas exploration and development, the target of exploration and development has gradually changed from simple high-amplitude structural reservoir to low porosity and low permeability, low resistivity, complex lithology and complex reservoir space. Low resistivity reservoir has become one of the main sources of reservoir increase and production in oil fields. Because the genetic types of low resistivity reservoirs are varied, and the skeleton conduction is one of the main causes of low resistance reservoirs, the research on the conductive law of conductive mineral formation has a certain guiding effect on the development of oil and gas reservoirs. In this paper, 12 artificial rock samples with different pyrite content and different muddy content were designed and pressed. The experimental data of rock electricity with different water saturation under different frequencies and different formation water mineralization degree at different frequencies are used, and the experimental data are quantitatively analyzed by X-ray diffraction whole rock of this group of rock samples in this paper, and the experimental data of rock electricity of different formation water mineralization degree under different frequency are used to make use of the experimental data of rock electricity of different water saturation under different frequencies. The influence of frequency on the conductive law of skeleton conductive shaly sandstone is analyzed and studied. The results show that: (1) both pyrite particles and argillaceous particles have dispersion characteristics; (2) with the increase of current frequency, the in-phase conductivity of rock samples increases gradually; Based on the experimental results of dispersion characteristics of skeleton conductive argillaceous sandstone samples, combined with the effective medium conduction theory, the formation is divided into five components: conductive skeleton particles, non-conductive skeleton particles, muddy, oil, gas and water, which are composed of five components: conductive skeleton particles, non-conductive framework particles, shale, oil, gas and water. The resistivity dispersion model of skeleton conductive shaly sandstone is established, and the effects of parameters such as pyrite content, pyrite conductivity, muddy content and shale conductivity on the dispersion characteristics of skeleton conductive shaly sandstone predicted by the model are analyzed. Then, based on the real resistivity data of petroleum-bearing rocks in the current frequency range of 1KHz and 20KHz, the unknown parameters in the effective medium resistivity dispersion model of skeleton conductive shaly sandstone are determined by the optimization technique. The fitting accuracy between the model and the experimental data is high, which shows that the resistivity dispersion model established in this paper can describe the dispersion characteristics of the skeleton conductive argillaceous sandstone formation. Finally, using the resistivity dispersion model of the effective medium of skeleton conductive shaly sandstone, the correction chart of frequency effect of skeleton conductive shaly sandstone with different pyrite content is established by selecting the current frequency of various practical logging applications. The method of correcting the apparent resistivity value of high frequency resistivity logging affected by pyrite content is given.
【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】：TE34;P618.13

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