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Oil Formation Volume Factor Determination Through a Fused Intelligence 基于融合智能的储层体积因子确定
IF 2.3 4区 地球科学 Q2 Earth and Planetary Sciences Pub Date : 2016-12-28 DOI: 10.1515/acgeo-2016-0099
A. Gholami
Volume change of oil between reservoir condition and standard surface condition is called oil formation volume factor (FVF), which is very time, cost and labor intensive to determine. This study proposes an accurate, rapid and cost-effective approach for determining FVF from reservoir temperature, dissolved gas oil ratio, and specific gravity of both oil and dissolved gas. Firstly, structural risk minimization (SRM) principle of support vector regression (SVR) was employed to construct a robust model for estimating FVF from the aforementioned inputs. Subsequently, an alternating conditional expectation (ACE) was used for approximating optimal transformations of input/output data to a higher correlated data and consequently developing a sophisticated model between transformed data. Eventually, a committee machine with SVR and ACE was constructed through the use of hybrid genetic algorithm-pattern search (GA-PS). Committee machine integrates ACE and SVR models in an optimal linear combination such that makes benefit of both methods. A group of 342 data points was used for model development and a group of 219 data points was used for blind testing the constructed model. Results indicated that the committee machine performed better than individual models.
油层条件与标准地面条件之间的油体积变化量称为油层体积因子(FVF),它的确定非常耗时、费钱、费力。该研究提出了一种准确、快速、经济的方法,可以根据储层温度、溶解气油比以及油和溶解气的比重来确定FVF。首先,利用支持向量回归(SVR)的结构风险最小化(SRM)原理,构建了基于上述输入估计FVF的鲁棒模型;随后,交替条件期望(ACE)用于逼近输入/输出数据到更高相关数据的最佳转换,从而在转换后的数据之间建立复杂的模型。最后,利用遗传算法-模式搜索(GA-PS)构建了一个具有SVR和ACE的委员会机。委员会机将ACE模型和SVR模型以最优线性组合的方式集成在一起,使两种方法都受益。一组342个数据点用于模型开发,一组219个数据点用于盲测构建的模型。结果表明,委员会机器的性能优于单个模型。
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引用次数: 2
Variations of Strength, Resistivity and Thermal Parameters of Clay after High Temperature Treatment 高温处理后粘土强度、电阻率及热参数的变化
IF 2.3 4区 地球科学 Q2 Earth and Planetary Sciences Pub Date : 2016-12-28 DOI: 10.1515/acgeo-2016-0090
Qiang Sun, Weiqiang Zhang, Yuliang Zhang, Lining Yang
This paper reports the variations of strength, resistivity and thermal parameters of clay after high-temperature heating. Experiments were carried out to test the physical properties of clay heated at temperatures ranging from room temperature to 800°C in a furnace. The experiment results show that below 400°C the uniaxial compressive strength and resistivity change very little. However, above 400°C, both increase rapidly. At a temperature under 400°C, the thermal conductivity and specific heat capacity decrease significantly. The thermogravimetric analysis (TG) and differential scanning calorimeter (DSC) test indicate that a series of changes occur in kaolinite at temperatures from 400 to 600°C, which is considered the primary cause of the variation of physical and mechanical properties of clay under high temperatures.
本文报道了高温加热后粘土的强度、电阻率和热参数的变化。实验测试了粘土在室温至800℃的炉内加热后的物理性能。实验结果表明,在400℃以下,单轴抗压强度和电阻率变化很小。然而,在400°C以上,两者都迅速增加。当温度低于400℃时,导热系数和比热容显著降低。热重分析(TG)和差示扫描量热仪(DSC)测试表明,在400 ~ 600℃高温下,高岭石发生了一系列变化,这被认为是高温下粘土物理力学性能变化的主要原因。
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引用次数: 9
Shear Wave Velocity Estimates through Combined Use of Passive Techniques in a Tectonically Active Area 在构造活动区联合使用被动技术估算横波速度
IF 2.3 4区 地球科学 Q2 Earth and Planetary Sciences Pub Date : 2016-12-28 DOI: 10.1515/acgeo-2016-0086
R. Biswas, S. Baruah
We made an attempt to assess the shear wave velocity values VS and, to a lesser extent, the VP values from ambient noise recordings in an array configuration. Five array sites were situated in the close proximity to borehole sites. Shear wave velocity profiles were modeled at these five array sites with the aid of two computational techniques, viz. spatial autocorrelation (SPAC) and H/V ellipticity. Out of these five array sites, velocity estimates could be reliably inferred at three locations. The shear wave velocities estimated by these methods are found to be quite consistent with each other. The computed VS values up to 30 m depth are in the range from 275 to 375 m/s in most of the sites, which implies prevalence of a low velocity zone at some pocket areas. The results were corroborated by evidence of site geology as well as geotechnical information.
我们尝试评估横波速度值VS,在较小程度上,从阵列配置的环境噪声记录中评估VP值。五个阵列点位于靠近钻孔点的位置。利用空间自相关(SPAC)和H/V椭圆度两种计算技术,对这5个阵列点的横波速度分布进行了建模。在这五个阵列站点中,可以可靠地推断出三个位置的速度估计。用这些方法计算出的横波速度是相当一致的。在大多数地点,30 m深度的计算VS值在275 ~ 375 m/s之间,这意味着在一些口袋区域存在低速带。这些结果得到了现场地质证据和岩土工程信息的证实。
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引用次数: 9
The Relationship of Stratospheric QBO with the Difference of Measured and Calculated NmF2 平流层QBO与实测与计算NmF2差的关系
IF 2.3 4区 地球科学 Q2 Earth and Planetary Sciences Pub Date : 2016-12-28 DOI: 10.1515/acgeo-2016-0061
K. Kurt, A. Yesil, S. Sağır, R. Atıcı
The relationship between stratospheric QBO and the difference (ΔNmF2) between NmF2 calculated with IRI-2012 and measured from ionosondes at the Singapore and Ascension stations in the equatorial region was statistically investigated. As statistical analysis, the regression analysis was used on variables. As a result, the relationship between QBO and ΔNmF2 was higher for 24:00 LT (local time) than 12:00 LT. This relationship is positive in the solar maximum epoch for both stations. In the solar minimum epoch, it is negative at 24:00 LT for Ascension and at 12:00 LT for Singapore. Furthermore, it was seen that the relationship of the ΔNmF2 with both the easterly and westerly QBO was negative for all solar epochs and every LT, at Ascension station. This relationship was only positive for solar maximum epoch and 12:00 LT, at Singapore station.
利用IRI-2012计算的NmF2与赤道地区新加坡站和阿森松站电离空仪测量的NmF2的差值(ΔNmF2)与平流层QBO的关系进行了统计研究。作为统计分析,对变量进行回归分析。结果表明,在24时(当地时间),QBO与ΔNmF2的关系大于12时(当地时间),这种关系在两个台站的太阳极大期都是正相关的。在太阳极小期,它是负的,在24点LT的扬升和12点LT的新加坡。此外,在阿森松站,ΔNmF2与东、西风QBO在所有太阳期和每个LT都呈负相关。这种关系仅在新加坡站的太阳极大期和12点LT时为正。
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引用次数: 17
Experimental and Numerical Analysis of Air Trapping in a Porous Medium with Coarse Textured Inclusions 含粗织构夹杂的多孔介质中空气捕集的实验与数值分析
IF 2.3 4区 地球科学 Q2 Earth and Planetary Sciences Pub Date : 2016-12-28 DOI: 10.1515/acgeo-2016-0095
Paulina Szymańska, Witold Tisler, C. Schütz, A. Szymkiewicz, I. Neuweiler, R. Helmig
The paper presents a 2D upward infiltration experiment performed on a model porous medium consisting of fine sand background with two inclusions made of coarser sands. The purpose of the experiment was to investigate the effects of structural air trapping, which occurs during infiltration as a result of heterogeneous material structure. The experiment shows that a significant amount of air becomes trapped in each of the inclusions. Numerical simulations were carried out using the two-phase water-air flow model and the Richards equation. The experimental results can be reproduced with good accuracy only using a two-phase flow model, which accounts for both structural and pore-scale trapping. On the other hand, the Richards equation was not able to represent the structural trapping caused by material heterogeneity.
本文在细砂为背景、粗砂为包裹体的模型多孔介质上进行了二维向上入渗实验。本实验的目的是研究在渗透过程中由于材料结构不均匀而发生的结构空气捕获的影响。实验表明,大量的空气被困在每个包裹体中。采用水-气两相流动模型和Richards方程进行了数值模拟。仅使用两相流模型即可较好地再现实验结果,该模型同时考虑了结构和孔隙尺度的捕获。另一方面,理查兹方程不能表征由材料非均质性引起的结构俘获。
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引用次数: 5
Acoustic Full Waveforms as a Bridge between Seismic Data and Laboratory Results in Petrophysical Interpretation 声波全波形作为岩石物理解释中地震数据与实验室结果之间的桥梁
IF 2.3 4区 地球科学 Q2 Earth and Planetary Sciences Pub Date : 2016-12-28 DOI: 10.1515/acgeo-2016-0116
K. Wawrzyniak-Guz
Mutual relationships between geological and geophysical data obtained by using methods of different scale are presented for the Miocene sandy-shaly thin-bedded formation and for the Zechstein carbonate formation. The common basis of laboratory results, well logging and seismic data was a recognition of elastic and reservoir properties of rocks. The common basis of laboratory results, well logging and seismic data were elastic and reservoir properties of rocks. Seismic attributes calculated from acoustic full waveforms were a link between the considered data. Seismic attributes strongly depend on small changes observed in rock formation related to lithology variations, facies changes, structural events and petrophysical properties variability. The observed trends and relationships of high correlation coefficients in the analysed data proved the assumption made at the beginning of research that common physical basis is a platform for data scaling. Proper scaling enables expanding the relationships determined from laboratory and well logging of petrophysical parameters to a seismic scale.
介绍了中新世砂质-泥质薄层地层和Zechstein碳酸盐岩地层不同尺度的地质资料与地球物理资料之间的相互关系。实验室结果、测井和地震资料的共同基础是对岩石的弹性和储层性质的认识。实验室结果、测井和地震资料的共同基础是岩石的弹性和储层性质。从声学全波形计算的地震属性是考虑数据之间的联系。地震属性在很大程度上取决于观察到的与岩性变化、相变化、构造事件和岩石物理性质变化有关的岩层中的微小变化。在分析数据中观察到的高相关系数的趋势和关系证明了研究开始时的假设,即共同的物理基础是数据缩放的平台。适当的尺度调整可以将实验室和测井确定的岩石物理参数的关系扩展到地震尺度。
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引用次数: 4
An Easy Method for Interpretation of Gravity Anomalies Due to Vertical Finite Lines 垂直有限线重力异常的一种简单解释方法
IF 2.3 4区 地球科学 Q2 Earth and Planetary Sciences Pub Date : 2016-12-28 DOI: 10.1515/acgeo-2016-0097
I. Kara, N. Hoskan
A new method is introduced to determine the top and bottom depth of a vertical line using gravity anomalies. For this, gravity at a distance x from the origin and horizontal derivative at that point are utilized. A numerical value is obtained dividing the gravity at point x by horizontal derivative. Then a new equation is obtained dividing the theoretical gravity equation by the derivative equation. In that equation, assigning various values to the depth and length of vertical line, several new numerical values are obtained. Among these values, a curve is obtained for the one that is closest to the first value from attending the depth and length values. The intersection point of these curves obtained by repeating this procedure several times for different points x yield the real depth and length values of the line. The method is tested on two synthetics and field examples. Successful results are obtained in both applications.
介绍了一种利用重力异常确定垂线上下深度的新方法。为此,利用距离原点x处的重力和该点处的水平导数。用x点的重力除以水平导数得到一个数值。然后用理论重力方程除以导数方程得到一个新的方程。在该方程中,对垂直线的深度和长度赋不同的值,得到了几个新的数值。在这些值中,通过参与深度和长度值,得到最接近第一个值的曲线。这些曲线的交点通过对不同的点x重复这一过程多次得到,从而得到线的实际深度和长度值。该方法在两种合成材料和现场实例上进行了验证。在两种应用中均获得了成功的结果。
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引用次数: 4
Very Low Frequency Electromagnetic Induction Surveys in Hydrogeological Investigations; Case Study from Poland 甚低频电磁感应测量在水文地质调查中的应用波兰案例研究
IF 2.3 4区 地球科学 Q2 Earth and Planetary Sciences Pub Date : 2016-12-28 DOI: 10.1515/acgeo-2016-0092
S. Oryński, M. Okoń, W. Klityński
In 2011, a geophysical survey was carried out in the surroundings of the Jagiellonian University in Cracow, using a Very Low Frequency method. The measurements were designed to determine the reason of frequent flooding of the lowest level of the building. The main objective of the study was to find out from where and in which way the rainwater seeps into the building and how this problem can be solved in the least invasive manner. The aim of geophysical methods was also to provide necessary information that will enable the construction of a hydro-geological model of the local environment. The interpretation revealed the presence of a sandy gutter surrounded by impermeable clay. There is a big resistivity contrast between those layers. Their location and approximate dimensions were determined.
2011年,在克拉科夫的雅盖隆大学周围进行了一次地球物理调查,使用了甚低频方法。测量的目的是确定建筑物最底层经常被洪水淹没的原因。该研究的主要目的是找出雨水从哪里以及以何种方式渗入建筑,以及如何以最小的侵入方式解决这个问题。地球物理方法的目的还在于提供必要的资料,以便能够建立当地环境的水文地质模型。这一解释揭示了被不透水粘土包围的沙质沟渠的存在。这些层之间的电阻率差异很大。确定了它们的位置和大致尺寸。
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引用次数: 4
Applying the General Regression Neural Network to Ground Motion Prediction Equations of Induced Events in the Legnica-Głogów Copper District in Poland 广义回归神经网络在波兰Legnica-Głogów铜矿区诱发事件地震动预测方程中的应用
IF 2.3 4区 地球科学 Q2 Earth and Planetary Sciences Pub Date : 2016-12-28 DOI: 10.1515/acgeo-2016-0104
J. Wiszniowski
This paper presents a study of the nonlinear estimation of the ground motion prediction equation (GMPE) using neural networks. The general regression neural network (GRNN) was chosen for its high learning rate. A separate GRNN was tested as well as a GRNN in cascade connection with linear regression (LR). Measurements of induced seis-micity in the Legnica-Głogów Copper District were used in this study. Various sets of input variables were tested. The basic variables used in every case were seismic energy and epicentral distance, while the additional variables were the location of the epicenter, the location of the seismic station, and the direction towards the epicenter. The GRNN improves the GMPE. The best results were obtained when the epicenter location was used as an additional input. The GRNN model was analysed for how it can improve the GMPE with respect to LR. The bootstrap resampling method was used for this purpose. It proved the statistical significance of the improvement of the GMPE. Additionally, this method allows the determination of smoothness parameters for the GRNN. Parameters derived through this method have better generalisation capabilities than the smoothness parameters estimated using the holdout method.
本文研究了利用神经网络对地震动预测方程进行非线性估计的方法。一般回归神经网络(general regression neural network, GRNN)具有较高的学习率。测试了单独的GRNN以及与线性回归(LR)级联的GRNN。本研究使用了Legnica-Głogów铜矿区的诱发地震活动性测量。测试了各种输入变量集。每种情况下使用的基本变量是地震能量和震中距离,而附加变量是震中位置、地震台站位置和朝向震中的方向。GRNN是对GMPE的改进。当震中位置作为附加输入时,得到了最好的结果。分析了GRNN模型如何提高相对于LR的GMPE。为此,采用了自举重采样方法。证明了GMPE改善的统计学意义。此外,该方法允许确定GRNN的平滑参数。通过该方法得到的参数比使用hold - out方法估计的平滑参数具有更好的泛化能力。
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引用次数: 7
Analysis of Coseismic Fault Slip Models of the 2012 Indian Ocean Earthquake: Importance of GPS Data for Crustal Deformation Studies 2012年印度洋地震同震断层滑动模型分析:GPS数据对地壳形变研究的重要性
IF 2.3 4区 地球科学 Q2 Earth and Planetary Sciences Pub Date : 2016-12-28 DOI: 10.1515/acgeo-2016-0106
E. Gunawan, P. Maulida, I. Meilano, M. Irsyam, J. Efendi
Based on continuous GPS data, we analyze coseismic deformation due to the 2012 Indian Ocean earthquake. We use the available coseismic slip models of the 2012 earthquake, derived from geodetic and/or seismic waveform inversion, to calculate the coseismic displacements in the Andaman-Nicobar, Sumatra and Java. In our analysis, we employ a spherical, layered model of the Earth and we find that Java Island experienced coseismic displacements up to 8 mm, as also observed by our GPS network. Compared to coseismic offsets measured from GPS data, a coseismic slip model derived from multiple observations produced better results than a model based on a single type of observation.
基于连续GPS数据,对2012年印度洋地震的同震形变进行了分析。我们利用2012年地震的同震滑动模型,通过大地测量和/或地震波形反演,计算了安达曼-尼科巴、苏门答腊和爪哇的同震位移。在我们的分析中,我们采用了地球的球形分层模型,我们发现爪哇岛经历了高达8毫米的同震位移,正如我们的GPS网络所观察到的那样。与GPS数据测量的同震偏移量相比,由多次观测得出的同震滑动模型比基于单一类型观测的模型产生更好的结果。
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引用次数: 16
期刊
Acta Geophysica
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