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顺9井区志留系柯坪塔格组下段低孔、特低渗储层岩石物理研究
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作者 林东升 冯兴强 黄为清 《石油天然气学报》 CAS 2018年第2期142-150,共9页
顺9井区志留系柯坪塔格组下段埋深大,为低孔、特低渗储层.由于测井曲线受井眼影响大,波阻抗对储层和流体不敏感,为此通过岩石物理试验来研究志留系的储层岩石物理特征和储层、流体的敏感参数.压力对砂岩纵、横波速度的影响比泥岩大,砂... 顺9井区志留系柯坪塔格组下段埋深大,为低孔、特低渗储层.由于测井曲线受井眼影响大,波阻抗对储层和流体不敏感,为此通过岩石物理试验来研究志留系的储层岩石物理特征和储层、流体的敏感参数.压力对砂岩纵、横波速度的影响比泥岩大,砂岩和泥岩的纵、横波速度均随着温度的变大而减小;纵、横波速度与波阻抗结合能够较好地区分砂、泥岩;当入射角较大时,利用弹性阻抗可以比较好地区分砂、泥岩;纵横波速度比对储层的识别效果较好.通过对试验参数和定义的参数排序,指出了研究区最佳的流体敏感参数. 展开更多
关键词 岩石物理 低孔、特低渗储层 志留系柯坪塔格组 顺9井区
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A Hybrid Dung Beetle Optimization Algorithm with Simulated Annealing for the Numerical Modeling of Asymmetric Wave Equations
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作者 Wei Xu-ruo Bai Wen-lei +2 位作者 Liu Lu Li You-ming Wang Zhi-yang 《Applied Geophysics》 SCIE CSCD 2024年第3期513-527,618,共16页
In the generalized continuum mechanics(GCM)theory framework,asymmetric wave equations encompass the characteristic scale parameters of the medium,accounting for microstructure interactions.This study integrates two th... In the generalized continuum mechanics(GCM)theory framework,asymmetric wave equations encompass the characteristic scale parameters of the medium,accounting for microstructure interactions.This study integrates two theoretical branches of the GCM,the modified couple stress theory(M-CST)and the one-parameter second-strain-gradient theory,to form a novel asymmetric wave equation in a unified framework.Numerical modeling of the asymmetric wave equation in a unified framework accurately describes subsurface structures with vital implications for subsequent seismic wave inversion and imaging endeavors.However,employing finite-difference(FD)methods for numerical modeling may introduce numerical dispersion,adversely affecting the accuracy of numerical modeling.The design of an optimal FD operator is crucial for enhancing the accuracy of numerical modeling and emphasizing the scale effects.Therefore,this study devises a hybrid scheme called the dung beetle optimization(DBO)algorithm with a simulated annealing(SA)algorithm,denoted as the SA-based hybrid DBO(SDBO)algorithm.An FD operator optimization method under the SDBO algorithm was developed and applied to the numerical modeling of asymmetric wave equations in a unified framework.Integrating the DBO and SA algorithms mitigates the risk of convergence to a local extreme.The numerical dispersion outcomes underscore that the proposed SDBO algorithm yields FD operators with precision errors constrained to 0.5‱while encompassing a broader spectrum coverage.This result confirms the efficacy of the SDBO algorithm.Ultimately,the numerical modeling results demonstrate that the new FD method based on the SDBO algorithm effectively suppresses numerical dispersion and enhances the accuracy of elastic wave numerical modeling,thereby accentuating scale effects.This result is significant for extracting wavefield perturbations induced by complex microstructures in the medium and the analysis of scale effects. 展开更多
关键词 FINITE-DIFFERENCE Asymmetric wave equation Numerical modeling DBO algorithm SA algorithm
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3D seismic forward modeling from the multiphysical inversion at the Ketzin CO_(2) storage site
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作者 Yi-kang Zheng Chong Wang +2 位作者 Hao-hong Liang Yi-bo Wang Rong-shu Zeng 《Applied Geophysics》 SCIE CSCD 2024年第3期593-605,620,共14页
From June 2008 to August 2013,approximately 67 kt of CO_(2) was injected into a deep saline formation at the Ketzin pilot CO_(2) storage site.During injection,3D seismic surveys have been performed to monitor the migr... From June 2008 to August 2013,approximately 67 kt of CO_(2) was injected into a deep saline formation at the Ketzin pilot CO_(2) storage site.During injection,3D seismic surveys have been performed to monitor the migration of sequestered CO_(2).Seismic monitoring results are limited by the acquisition and signal-to-noise ratio of the acquired data.The multiphysical reservoir simulation provides information regarding the CO_(2) fluid behavior,and the approximated model should be calibrated with the monitoring results.In this work,property models are delivered from the multiphysical model during 3D repeated seismic surveys.The simulated seismic data based on the models are compared with the real data,and the results validate the effectiveness of the multiphysical inversion method.Time-lapse analysis shows the trend of CO_(2) migration during and after injection. 展开更多
关键词 Seismic forward modeling reservoir simulation CO_(2)storage time-lapse analysis
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Tectonic framework of Qilian orogen: reveal from an aeromagnetic anomaly feature
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作者 Yang Hai Xiong Shengqing +7 位作者 Liu Qiankun Zhou Daoqing Yang Xue Fan Zhengguo Jia Zhiye Li fang Gao xiuhe Liu fuxiang 《Applied Geophysics》 SCIE CSCD 2024年第3期528-548,618,619,共23页
The Qilian Orogenic belt is one of the typical orogenic belts globally and a natural laboratory for studying plate tectonics.Many researchers have studied the ophiolite and high pressure and ultra-high pressure metamo... The Qilian Orogenic belt is one of the typical orogenic belts globally and a natural laboratory for studying plate tectonics.Many researchers have studied the ophiolite and high pressure and ultra-high pressure metamorphic rocks in the Qilian orogen and obtained valuable achievements.However,a hot debate exists on the basement property,the distribution of ophiolite,and the boundaries of tectonic units.Large-scale high-precision aeromagnetic surveys have recently been conducted in the Qilian Orogenic belt and adjacent areas.In this study,we are trying to analysis the tectonic framework of the Qilian Orogen using 1:500,000 aeromagnetic data.The results provide geophysical perspectives for studying the structural framework and deformation of this area.According to the aeromagnetic∆T anomaly map,the central and Southern Qilian have the same magnetic anomaly feature that noticeably differs from the North Qilian Orogenic belt and the Qaidam Block.This result indicates that the central and Southern Qilian have a unified magnetic basement and differ from the North Qilian orogenic belt and Qaidam Block.The map shows the distribution of ophiolite in the North Qilian orogenic belt.Linear magnetic anomalies represent the ophiolites because the mafic–ultramafic rocks usually have high magnetic susceptibility.The ophiolite belts are continuously distributed in the western part of North Qilian orogenic belt and have a large scale.However,the scale of the ophiolite belt and the outcropping of mafic–ultramafic rocks reduces when they pass through Qilian County to the east.The results indicate differences in the evolution process between the eastern and western parts of North Qilian,with Qilian County as the transition zone.This study also systematically defines the geophysical boundaries of the Qaidam Block,Qilian Block,North Qilian Orogenic belt,and Alxa block.It is proposed that the sinistral displacement of the Altun Fault is adjusted and absorbed by the series of NE-trending faults in the Qilian orogen and merge into the Longshoushan–Gushi Fault.The extension of the North Qilian Orogenic belt is strengthened by the neotectonics movement along the shearing direction,which separated the North Qilian Orogenic belt into several segments and formed a series of northeast-trending faults. 展开更多
关键词 Qilian orogen tectonic framework aeromagnetic anomaly feature mafic–ultramafic
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黄河上游贵德盆地席芨滩巨型滑坡发育特征及地貌演化 被引量:15
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作者 赵无忌 殷志强 +1 位作者 马吉福 秦小光 《地质论评》 CAS CSCD 北大核心 2016年第3期709-721,共13页
黄河上游贵德盆地位于青藏高原东北缘,是我国地质灾害最发育的地区之一,该地区的巨型滑坡因其方量大、危害严重、机制复杂等特点在全球范围内都具有典型性和代表性。本文以贵德盆地黄河左岸的席芨滩巨型滑坡为研究对象,通过资料收集、... 黄河上游贵德盆地位于青藏高原东北缘,是我国地质灾害最发育的地区之一,该地区的巨型滑坡因其方量大、危害严重、机制复杂等特点在全球范围内都具有典型性和代表性。本文以贵德盆地黄河左岸的席芨滩巨型滑坡为研究对象,通过资料收集、野外精细调查、遥感影像解译和测年数据,分析了该巨型滑坡的发育期次和诱发因素,认为滑坡发育主要经历了4个阶段:1全新世早期温度升高引发冰雪融水增多导致黄河侵蚀作用加强而引发的Ⅰ期滑坡;2由全新世适宜期暖湿气候条件下降水触发的Ⅱ期滑坡;3由1872年历史地震诱发的Ⅲ期滑坡;4由降雨和近年来人类工程活动引发的Ⅳ期滑坡。文章最后讨论了席芨滩巨型滑坡对贵德盆地黄河河谷地貌演化过程的影响。 展开更多
关键词 黄河上游 贵德盆地 席芨滩滑坡 发育特征 地貌演化
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Continuous TDEM for monitoring shale hydraulic fracturing 被引量:15
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作者 Yan Liang-Jun Chen Xiao-Xiong +4 位作者 Tang Hao Xie Xing-Bing Zhou Lei Hu Wen-Bao and Wang Zhong-Xin 《Applied Geophysics》 SCIE CSCD 2018年第1期26-34,147,148,共11页
Monitoring and delineating the spatial distribution of shale fracturing is fundamentally important to shale gas production. Standard monitoring methods, such as time-lapse seismic, cross-well seismic and micro-seismic... Monitoring and delineating the spatial distribution of shale fracturing is fundamentally important to shale gas production. Standard monitoring methods, such as time-lapse seismic, cross-well seismic and micro-seismic methods, are expensive, time- consuming, and do not show the changes in the formation with time. The resistivities of hydraulic fracturing fluid and reservoir rocks were measured. The results suggest that the injection fluid and consequently the injected reservoir are characterized by very low resistivity and high chargeability. This allows using of the controlled-source electromagnetic method (CSEM) to monitor shale gas hydraulic fracturing. Based on the geoelectrical model which was proposed according to the well-log and seismic data in the test area the change rule of the reacted electrical field was studied to account for the change of shale resistivity, and then the normalized residual resistivity method for time lapse processing was given. The time-domain electromagnetic method (TDEM) was used to continuously monitor the shale gas fracturing at the Fulin shale gas field in southern China. A high-power transmitter and multi-channel transient electromagnetic receiver array were adopted. 9 h time series of Ex component of 224 sites which were laid out on the surface and over three fracturing stages of a horizontal well at 2800 m depth was recorded. After data processing and calculation of the normalized resistivity residuals, the changes in the Ex signal were determined and a dynamic 3D image of the change in resistivity was constructed. This allows modeling the spatial distribution of the fracturing fluid. The model results suggest that TDEM is promising for monitoring hydraulic fracturing of shale. 展开更多
关键词 Shale fracturing RESISTIVITY time lapse 3D imaging continuous monitoring
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Feasibility of central loop TEM method for prospecting multilayer water-fi lled goaf 被引量:9
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作者 Yan Shu Xue Gou-Qiang +2 位作者 Qiu Wei-Zhong Li Hai Zhong Hua-Sen 《Applied Geophysics》 SCIE CSCD 2016年第4期587-597,736,共12页
With deep mining of coal mines, prospecting multilayer water-filled goaf has become a new content that results from geophysical exploration in coalfields. The central loop transient electromagnetic (TEM) method is f... With deep mining of coal mines, prospecting multilayer water-filled goaf has become a new content that results from geophysical exploration in coalfields. The central loop transient electromagnetic (TEM) method is favorable for prospecting conductive layers because of the coupling relationship between its field structure and formation. However, the shielding effect of conductive overburden would not only require a longer observation time when prospecting the same depth but also weaken the anomalous response of underlying layers. Through direct time domain numerical simulation and horizontal layered earth forward modeling, this paper estimates the length of observation time required to prospect the target, and the distinguishable criterion of multilayer water-filled goal is presented with observation error according to the effect of noise on observation data. The observed emf curves from Dazigou Coal Mine, Shanxi Province can distinguish multilayer water-filled goaf. In quantitative inversion interpretation of observed curves, using electric logging data as initial parameters restrains the equivalence caused by coal formation thin layers. The deduced three-layer and two-layer water-filled goals are confirmed by the drilling hole. The result suggests that when observation time is long enough and with the anomalous situation of underlying layers being greater than the observation error, the use of the central loop TEM method to orosoect a multilaver water-filled goaf is feasible. 展开更多
关键词 central loop TEM method prospecting multilayer water-filled goaf conductive shielding layer numerical and theoretical analysis length of observation time observation error distinguishable criterion
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Boundary-refl ected waves and ultrasonic coda waves in rock physics experiments 被引量:3
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作者 Fu Bo-Ye Fu Li-Yun +1 位作者 Wei Wei Zhang Yan 《Applied Geophysics》 SCIE CSCD 2016年第4期667-682,739,共17页
Ultrasonic coda waves are widely usea to stuay hign-trequency scattering, however, ultrasonic coda waves are strongly affected by interference from by boundary-reflected waves. To understand the effect of boundary-ref... Ultrasonic coda waves are widely usea to stuay hign-trequency scattering, however, ultrasonic coda waves are strongly affected by interference from by boundary-reflected waves. To understand the effect of boundary-reflected waves, we performed ultrasonic experiments using aluminum and shale samples, and the rotating staggered-mesh finite-difference method to simulate the wavefield. We analyzed the wavefield characteristics at the different receiving points and the interference characteristics of the boundary-reflected waves with the ultrasonic coda wave, and the effect of sample geometry on the ultrasonic coda waves. The increase in the aspect ratio of the samples delays the interference effect of the laterally reflected waves and reduces the effect on the ultrasonic coda waves. The main waves interfering with the ultrasonic coda waves are laterally reflected PP-, PS-, PPP-, and PPS-waves. The scattering and attenuation of the high-frequency energy in actual rocks can weaken the interference of laterally reflected waves with the ultrasonic coda waves. 展开更多
关键词 Rock physics boundary-reflected waves coda wave INTERFERENCE numerical simulation
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A Bregman adaptive sparse-spike deconvolution method in the frequency domain 被引量:2
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作者 Pan Shu-Lin Yan Ke +1 位作者 Lan Hai-Qiang Qin Zi-Yu 《Applied Geophysics》 SCIE CSCD 2019年第4期463-472,560,共11页
To improve the anti-noise performance of the time-domain Bregman iterative algorithm,an adaptive frequency-domain Bregman sparse-spike deconvolution algorithm is proposed.By solving the Bregman algorithm in the freque... To improve the anti-noise performance of the time-domain Bregman iterative algorithm,an adaptive frequency-domain Bregman sparse-spike deconvolution algorithm is proposed.By solving the Bregman algorithm in the frequency domain,the influence of Gaussian as well as outlier noise on the convergence of the algorithm is effectively avoided.In other words,the proposed algorithm avoids data noise effects by implementing the calculations in the frequency domain.Moreover,the computational efficiency is greatly improved compared with the conventional method.Generalized cross validation is introduced in the solving process to optimize the regularization parameter and thus the algorithm is equipped with strong self-adaptation.Different theoretical models are built and solved using the algorithms in both time and frequency domains.Finally,the proposed and the conventional methods are both used to process actual seismic data.The comparison of the results confirms the superiority of the proposed algorithm due to its noise resistance and self-adaptation capability. 展开更多
关键词 DECONVOLUTION split Bregman algorithm frequency domain generalized cross validation OUTLIERS
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Normal moveout for long offset in isotropic media using the Padé approximation 被引量:1
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作者 Song Han-Jie Zhang Jin-Hai Yao Zhen-Xing 《Applied Geophysics》 SCIE CSCD 2016年第4期658-666,738,739,共11页
The nomaal moveout correction is important to long-offset observations, especially deep layers. For isotropic media, the conventional two-term approximation of the normal moveout function assumes a small offset-to-dep... The nomaal moveout correction is important to long-offset observations, especially deep layers. For isotropic media, the conventional two-term approximation of the normal moveout function assumes a small offset-to-depth ratio and thus fails at large offset-to-depth ratios. We approximate the long-offset moveout using the Pade approximation. This method is superior to typical methods and flattens the seismic gathers over a wide range of offsets in multilayered media. For a four-layer model, traditional methods show traveltime errors of about 5 ms for offset-to-depth ratio of 2 and greater than 10 ms for offset-to-depth ratio of 3; in contrast, the maximum traveltime error for the [3, 3]-order Pade approximation is no more than 5 ms at offset-to-depth ratio of 3. For the Cooper Basin model, the maximum oft'set-to-depth ratio for the [3, 3]-order Pade approximation is typically double of those in typical methods. The [7, 7]-order Pade approximation performs better than the [3.3]-order Pade armroximation. 展开更多
关键词 Pade approximation long offset normal moveout isotropic medium
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Fast and accurate calculation of seismic wave travel time in 3D TTI media 被引量:1
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作者 Mao Yuan-Tong Zhao Ai-Hua 《Applied Geophysics》 SCIE CSCD 2021年第4期545-556,594,595,共14页
The Tilted tilted transversely isotropic(TTI)media,a kind of anisotropic medium,widely exists within the earth.For faster calculation of travel times in the TTI anisotropic media,we modifi ed a minimum traveltime tree... The Tilted tilted transversely isotropic(TTI)media,a kind of anisotropic medium,widely exists within the earth.For faster calculation of travel times in the TTI anisotropic media,we modifi ed a minimum traveltime tree algorithm with high effi ciency by dynamical modifi cation of the secondary wave propagation region during the spread of seismic waves.To manage the wavefront points in the modified version,we used a novel minimum heap sorting technique to reduce the time spent on selecting secondary waves points.In this study,seismic group velocities were obtained from analytical solutions in terms of phase angle,and the corresponding phase angles were determined by binary search rather than approximate equations for weakly anisotropic media.For the most time-consuming part of the secondary wave traveltime calculation,the parallel computation was initially performed using multiple cores and threads.Numerical examples showed that the improved method can calculate seismic travel times and ray paths faster and accurately in a 3D TTI medium.For four cores and eight threads,the computing speed increased by six times when compared to the conventional method. 展开更多
关键词 TTI media ray tracing minimum traveltime tree algorithm minimum heap sorting parallel computation
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Removal of the airwave effect by main-part decomposition of the anomalous field of MCSEM data 被引量:1
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作者 Wang Shu-Ming Di Qing-Yun +3 位作者 Wang Ruo Wang Xue-Mei Su Xiao-Lu and Wang Peng-Fei 《Applied Geophysics》 SCIE CSCD 2018年第1期3-10,147,共9页
The airwave effect greatly influences the observational data from controlledsource electromagnetic exploration in shallow seas, which obscures the abnormal effects generated by exploration targets and, hence, affects ... The airwave effect greatly influences the observational data from controlledsource electromagnetic exploration in shallow seas, which obscures the abnormal effects generated by exploration targets and, hence, affects the accuracy of the late exploration data interpretation. In this study, we propose a method to separate the main part from the anomalous field of marine controlled-source electromagnetic method (MCSEM) data based on Stratton-Chu integral transforms to eliminate the airwave effect, which dominates observed electromagnetic (EM) response in shallow seawater. This method of separating the main part from the anomalous field is a type of finite impulse response filter based on a discrete data set. Theoretical analysis proved that the method is stable and able to effectively depress noise. A numerical test indicated that the method could successfully eliminate the airwave effect from the observed EM signals generated by an air water interface and a seawater layer. This technique is applicable for seawater models with either flat or rough seabeds. 展开更多
关键词 MCSEM airwave integral transform anomalous field separation of the main part
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Super-resolution least-squares prestack Kirchhoff depth migration using the L_0-norm
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作者 Wu Shao-Jiang Wang Yi-Bo +1 位作者 Ma Yue and Chang Xu 《Applied Geophysics》 SCIE CSCD 2018年第1期69-77,148,149,共11页
Least-squares migration (LSM) is applied to image subsurface structures and lithology by minimizing the objective function of the observed seismic and reverse-time migration residual data of various underground refl... Least-squares migration (LSM) is applied to image subsurface structures and lithology by minimizing the objective function of the observed seismic and reverse-time migration residual data of various underground reflectivity models. LSM reduces the migration artifacts, enhances the spatial resolution of the migrated images, and yields a more accurate subsurface reflectivity distribution than that of standard migration. The introduction of regularization constraints effectively improves the stability of the least-squares offset. The commonly used regularization terms are based on the L2-norm, which smooths the migration results, e.g., by smearing the reflectivities, while providing stability. However, in exploration geophysics, reflection structures based on velocity and density are generally observed to be discontinuous in depth, illustrating sparse reflectance. To obtain a sparse migration profile, we propose the super-resolution least-squares Kirchhoff prestack depth migration by solving the L0-norm-constrained optimization problem. Additionally, we introduce a two-stage iterative soft and hard thresholding algorithm to retrieve the super-resolution reflectivity distribution. Further, the proposed algorithm is applied to complex synthetic data. Furthermore, the sensitivity of the proposed algorithm to noise and the dominant frequency of the source wavelet was evaluated. Finally, we conclude that the proposed method improves the spatial resolution and achieves impulse-like reflectivity distribution and can be applied to structural interpretations and complex subsurface imaging. 展开更多
关键词 SUPER-RESOLUTION LEAST-SQUARES Kirchhoff depth migration L0-norm REGULARIZATION
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