Simultaneous-source acquisition helps greatly boost an economic saving, while it brings unprecedented challenge of removing the crosstalk interference in recorded seismic data. In this paper, we propose a novel iterative method to separate simultaneous source data based on coherency-pass shaping operator. The filter is used constrain model, that is, unblended be estimated, regularization framework. survey, incoherent from adjacent shots increases rank frequency domain Hankel matrix formed...

The southern Sichuan Basin in China holds abundant shale gas resources; however, the bearing property shows great differences due to multiple stages of tectonic transformation. key revealing differential enrichment mechanism is explore thermal evolution characteristics during evolution. Therefore, taking Luzhou and Changning blocks as an example, which have obvious evolution, organic geochemical conditions Longmaxi were firstly compared with test data. Then, under background uplift-erosion...

Simultaneous-source acquisition, breaking the limit of conventional seismic is a rapidly evolving research field, due to its advantage in reducing survey time and improving data quality. The benefits simultaneous-source acquisition are compromised by intense blending interference. Separating blended record into group individual records, known as "deblending" one most popular solution problem. However, records often corrupted random noise, which causes difficulties separation. In an iterative...

Least-squares reverse time migration (LSRTM) can provide higher quality images than conventional migration, which is helpful to image simultaneous-source data. However, it still faces the problems of crosstalk noise, great computation time, and storage requirement. We propose a new LSRTM approach by using excitation amplitude (EA) imaging condition suppress noise. Since only maximum or limited local amplitudes at each point corresponding travel step(s) need be saved, problem naturally...

In many areas, depth imaging of seismic data is required to construct an accurate view the reservoir structure. This especially true in areas complex geology and with salt tectonics. Having identified structure, we course want extract further information on lithology, quality, fluids. can be achieved by amplitude variation offset (AVO) inversion. Traditionally, depth-imaged are inverted converting it back into time domain enable represented convolution a consistent wavelet, varying only...

Simultaneous-source method is usually adopted, as one of the most efficient ways, to reduce computation cost full waveform inversion (FWI). Unfortunately, this facing with problem crosstalk noise, degrading quality results. To avoid problem, we propose an algorithm time–frequency hybrid-domain simultaneous-source FWI based on time-domain finite difference phase sensitive detection method. The harmonic sine functions different frequencies are used wavelet signals for sources within super...

Simultaneous source acquisition, which allows a temporal overlap between shot records, has significant advantages to improve data quality (e.g., denser shooting) and reduce acquisition cost efficient wide-azimuth shooting). We have developed novel shot-domain deblending approach for simultaneous shooting survey based on an inversion scheme. The inverse problem is formulated by introducing two convolution operators that can respectively destruct the signal interference solved...

The proximal splitting algorithm, which reduces complex convex optimization problems into a series of smaller subproblems and spreads the projection operator onto set proximity function, has recently been introduced in area signal processing. Following framework, we propose novel three-operator (TOPS) algorithm for 3-D seismic data reconstruction with both singular value decomposition (SVD)-based low-rank constraint curvelet-domain sparsity constraint. Compared well-known forward-backward...

As a rare and functional edible mushroom, the market potential of ready-to-eat fresh-cut Changgen mushrooms (Oudemansiella raphanipes) is booming in developing countries. However, preservation challenging distribution consumption. The present study discovered that exogenous L-cysteine (L-Cys) treatment delayed weight loss, browning degree, nutrition depletion microbial contamination at 4 °C. Based on transcriptomic data, L-Cys significantly activated metabolism 17 amino acids, including...

The ocean bottom node (OBN) seismic acquisition system is designed to gather high-fidelity, wide-azimuth, and long-offset four-component (4C) data, which includes shear waves enables the use of elastic assumption in imaging inversion. However, deploying geophysical instruments on seafloor difficult costly, leading usual adoption sparse spacing. This can, however, lead poor illumination challenges, especially shallow subsurface near seafloor. To address these issues context 4C imaging, we...

The poroelastodynamic equations are used to describe the dynamic solid–fluid interaction in reservoir. To obtain intrinsic properties of reservoir rocks from geophysical data measured both laboratory and field, we need an accurate solution wave propagation porous media. At present, poroelastic mostly solved time domain, which involves a difficult complicated convolution. In order avoid issues caused by convolution, propose frequency–space domain method. composed linear system frequency...

We develop a data-adaptive polarization filter that can spectacularly reduce microseismic noise contamination in three-component broad-band seismograms. The uses multitaper spectral analysis method for computing the data density matrix, which is defined as an ensemble average of outer products spectrum and its Hermitian adjoint. Under assumption strong three-component, seismograms additive white noise, be determined from seismogram segments without signals, is, pre-signal arrival time...

Elastic full waveform inversion (FWI) is more suitable to process multicomponent seismic data and can provide subsurface medium information than acoustic FWI often with lower efficiency. Except for the parallel algorithms, source-encoding methods are usually adopted improve efficiency of FWI, but it includes crosstalk noise. Besides, additional source estimation process, critical a successful would counteract high-efficiency advantage algorithm. We propose an elastic source-independent...

In real-world scenarios, the effectiveness of seismic denoising methods based on supervised learning (SL) is hindered by scarcity clean labeled data. A network trained synthetic data often struggles to adapt distinct feature distributions field To address this challenge, we develop an self-SL strategy that effectively attenuates various types noise using a single model. Our approach starts with warm-up phase pretrains artificially noisier-noisy pairs, enhancing its stability and ability...

Data-adaptive polarization filtering is used to improve the detection of converted seismic phases. Both direct waves and mode-converted PS SP arrivals may be more easily picked on filtered records. An autopicking routine applied that cuts traces according modelled traveltime each phase through an initial structure. Use forward-modelled, source–receiver times reduces likelihood automatic pick being incorrectly made spurious spikes in trace. It therefore a realistic way automatically picking...

Distributed acoustic sensing in vertical seismic profile (DAS-VSP) acquisition plays an important role reservoir monitoring. But the field data can be noisy and associated with missing traces which affects imaging geological interpretation. Therefore, DAS-VSP reconstruction a high signal-to-noise ratio (SNR) is worth studying. There are no exact relationships between signals noise t-x domain data, means that reconstructing suppressing simultaneously by deep neural network difficult. We...

SUMMARY Full-waveform inversion (FWI) has been proven to be an effective tool for high-resolution multiparameter imaging of the shallow subsurface. It shown that Gauss–Newton (GN) optimization method uses off-diagonal information contained in Hessian matrix and can increase resolution mitigate crosstalk viscoelastic FWI. In this work, we demonstrate advantages GN FWI over conventional with a conjugate gradient by using synthetic examples. We also investigate potential seismic-wave 2-D as...

SUMMARY Most researches on the Biot-squirt (BISQ) model are limited to poroelastic transverse isotropic (TI) media. Actually, poro-viscoelasticity and orthorhombic anisotropy closer realistic properties of many reservoir Therefore, we expand BISQ theory poro-viscoelastic media develop corresponding constitutive relation 3-D wave equations in time domain. Here, generalized Zener linear body is introduced describe relaxation effect solid skeleton, pore fluid assumed be saturated. The...

Elastic least-squares migration (ELSM) has the potential to produce high-resolution images. It can be implemented in either data-domain or image-domain but is much faster image domain. A critical step of ELSM calculation Hessian. However, it impractical directly calculate Hessian due its high storage and costs. In this letter, efficiently constructed with elastic point spread functions (PSFs) calculated by a combination multicomponent Gaussian beam Born modeling (of scattering points...