A5044745593- Seismic Imaging and Inversion Techniques
- Seismic Waves and Analysis
- Hydraulic Fracturing and Reservoir Analysis
- Geophysical Methods and Applications
- Drilling and Well Engineering
- Underwater Acoustics Research
- Geological and Geophysical Studies
- earthquake and tectonic studies
- Image and Signal Denoising Methods
- High-pressure geophysics and materials
- Seismology and Earthquake Studies
- Hydrocarbon exploration and reservoir analysis
- Medical Imaging Techniques and Applications
- Planetary Science and Exploration
- Astro and Planetary Science
- Geoscience and Mining Technology
- Sparse and Compressive Sensing Techniques
- Groundwater and Isotope Geochemistry
- Climate Change Policy and Economics
- Market Dynamics and Volatility
- Groundwater flow and contamination studies
- Methane Hydrates and Related Phenomena
- Geochemistry and Geologic Mapping
- Energy, Environment, Economic Growth
- Advanced X-ray Imaging Techniques
Institute of Geology and Geophysics
2016-2025
Chinese Academy of Sciences
2016-2025
Beijing Institute of Technology
2025
Northwest A&F University
2022-2023
Luoyang Normal University
2021
Guangdong University of Technology
2021
University of Chinese Academy of Sciences
2019
Wuhan University of Technology
2017
Institute of Geology and Geophysics
2015
ExxonMobil (United States)
2010-2011
Abstract Exploring the subsurface structure and stratification of Mars advances our understanding Martian geology, hydrological evolution palaeoclimatic changes, has been a main task for past continuing exploration missions 1–10 . Utopia Planitia, smooth plains volcanic sedimentary strata that infilled impact crater, prime target such as it is inferred to have hosted an ancient ocean on 11–13 However, 45 years passed since Viking-2 provided ground-based detection results. Here we report in...
Some hydrocarbon reservoirs are trapped beneath salt bodies, where seismic imaging is greatly challenged due to poor illumination. Multiple reflections have different propagation wave paths from primary and thus can be used complement the illuminations not acquired. Consequently, migration of multiples sometimes provide better subsalt images compared conventional which uses only. In this paper, we propose modify reverse time so that as constructive reflection energy for imaging. This new...
The scalar median filter (SMF) is often used to reduce noise in geophysical data. We present an extension of the SMF a vector (VMF) for suppressing contained data represented by multidimensional, multicomponent fields. Although can be applied each component field individually, VMF all components simultaneously. Like SMF, intends suppress random while preserving discontinuities Preserving such essential exploration geophysics because manifest important geologic features as faults and...
Reverse time migration (RTM) using multiples generates inherent crosstalk artifacts due to the interference among of different orders. We have developed a method remove such crosstalk. This approach first separates recorded seismic data into primary reflections and surface-related elimination algorithm then isolates can take any specified, say [Formula: see text]th, order as incident wave next higher data, ([Formula: text])th order, corresponding reflection for imaging. applied least-squares...
Abstract As the largest basin on Mars, Utopia Planitia has both experienced and recorded variations of Martian palaeoclimate. Layered subsurface structures have been identified by ground-penetrating radar in southern but lateral subsurface, potentially linked to palaeoclimatic evolution, not investigated. Here we report frequency-variation patterns Zhurong reflections interpret them as buried polygonal terrain below a depth 35 m. Sixteen wedges were within ∼1.2 km distance, suggesting wide...
Least-squares migration (LSM) can be effective to mitigate the limitation of finite-seismic acquisition, balance subsurface illumination, and improve spatial resolution image, but it requires iterations demigration obtain desired reflectivity model. The computational efficiency accuracy operators are crucial for applying algorithm. We have developed a test feasibility using Gaussian beam as wavefield extrapolating operator LSM, denoted least-squares migration. Our method combines advantages...
In the correlative least-squares reverse time migration (CLSRTM) scheme, a stacked image is updated using gradient-based inversion algorithm. However, CLSRTM experiences incoherent stacking of different shots during each iteration due to use an imperfect velocity, which leads smearing. To reduce sensitivity velocity errors, we have developed prestack (PCLSRTM), in gradient descent algorithm newly defined initial and efficiently analytical step length separately seek optimal for shot gather...
Abstract Time‐reversal imaging is a critical technique for characterizing natural earthquakes and artificial sources. Traditional time reversal methods sum the extrapolated wavefields of different receivers to suppress artifacts obtain images Multiplication‐based time‐reversal uses product provide source with fewer higher resolutions. However, although multiplication among efficiently suppresses artifacts, sources weaker energy are also suppressed. We combined two algorithms proposed...
The effect of ferric ions (Fe3+) on the flotation zircon and cassiterite using sodium oleate (NaOL) was investigated by single mineral tests, adsorption density zeta potential measurements, solution chemistry analyses, FTIR analyses. It is difficult for to be separated from NaOL alone. Nevertheless, activated while that depressed in presence Fe3+. Adsorption tests indicated addition Fe3+ enhanced surfaces, whereas it receded surfaces. Zeta measurements analyses found H(OL) 2 − predominant...
Many full-waveform inversion schemes are based on the iterative perturbation theory to fit observed waveforms. When waveforms lack low frequencies, those may encounter convergence problems due cycle skipping when initial velocity model is far from true model. To mitigate this difficulty, we have developed a new objective function that fits seismic-waveform intensity, so dependence of starting can be reduced. The waveform intensity proportional square its amplitude. Forming using nonlinear...
Internal multiple reflections have different propagation paths than primary and surface-related multiples; thus, they can complement illumination where other waves are unavailable. Consequently, migration of internal multiples may provide vital images in the shadow zone reflections. We developed an approach to image structures with multiples. With this method, be separated used as data for reverse time migration. Instead applying imaging condition directly source receiver wavefields, we...
For vertical seismic profile (VSP), free-surface multiples can provide much wider subsurface illumination when compared with primaries. However, migration of multiple reflections generates not only the desired image reflection interfaces but also many crosstalk artifacts. Therefore, least-squares reverse time method is used to VSP downgoing (receiver-side ghosts) and iteratively suppress crosstalks, in which full data (including direct waves) are as sources observed data, respectively. To...
Full-waveform inversion (FWI) is an attractive technique due to its ability build high-resolution velocity models. Conventional amplitude-matching FWI approaches remain challenging because the simplified computational physics used does not fully represent all wave phenomena in earth. Because earth attenuating, a sample-by-sample fitting of amplitude may be feasible practice. We have developed normalized nonzero-lag crosscorrelataion-based elastic algorithm maximize similarity calculated and...
A 3‐D tomographic inversion approach based on a surface‐consistent model for static corrections is presented in this paper. Direct, reflected, and refracted waves are used simultaneously to update the near‐surface model. We analyze characteristics of first‐break traveltime complicated low‐velocity layers. To improve accuracy velocity model, various times from direct, considered inversion. fractal algorithm which overcomes error caused by wavelet shape differences applied pick first breaks....
Free-surface multiples have been used in the reverse time migration (RTM) procedure to provide additional subsurface illumination. However, imaging multiple reflections with conventional RTM operators generates many crosstalk artifacts. Least-squares (LSRTM) can be iteratively suppress artifacts of multiples; however, method is computationally intensive. By applying linear Radon transformation hundreds shots acquired data produce dozens plane-wave gathers, we developed domain LSRTM...
The computational cost of quasi-P wave extrapolation depends on the complexity medium, and specifically anisotropy. Our effective-model method splits anisotropic dispersion relation into an isotropic background a correction factor to handle this dependency. term slope (measured using gradient) current wavefields As result, is independent nature anisotropy, which makes efficient. A dynamic implementation approach decomposes original pseudo-differential operator Laplacian, handled low-rank...
A complex Meso-Cenozoic history characterizes the offshore Indus Basin Pakistan, including rifting, drifting, collision, transpression and recent inverted extension that is poorly understood. We use reflection seismic data to document geometry of structures accommodated deformation well correlate sedimentary sequences which were affected by different tectonic episodes. Synthetic seismograms have been prepared for calibrating with information identification key reflections representative...
Because local slant stacking increases the data dimension in beam migration, volume of stacks can be enormous and obstruct efficient processing. In addition, a proper compression algorithm reduce computation ray tracing mapping. Thus, compressing with high fidelity improve efficiency migration. A new approach is proposed to efficiently compress stacks. This combines estimation multiple slopes based on structure tensor number slopes, sparse representation for stacked via matching pursuit...