When exploring new areas, it is desirable to have a robust inversion methodology that can obtain reliable results in reasonable time. In addition, also such be run with or without any priori well information. This particularly important deep water where information sparse and seismic data the only on which initial exploration strategy based. This paper describes combination of prestack poststack allows efficient large volumes absence hybrid first runs genetic algorithm (GA) at discrete...

Well log prediction while drilling estimates the rock properties ahead of bits. A reliable well is able to assist reservoir engineers in updating geological models and adjusting strategy if necessary. This great significance reducing risk saving costs. Conventional interactive integration geophysical data understanding primary approach realize drilling. In this paper, we propose a new artificial intelligence make by integrating seismic impedance with three neural networks: LSTM,...

Contrastive learning has emerged as a dominant paradigm for understanding 3D open-world environments, particularly in the realm of multi-modalities. However, due to nature self-supervised and limited size datasets, pre-trained models point cloud domain often suffer from overfitting downstream tasks, especially zero-shot classification. To tackle this problem, we design module mine enhance hard negatives which are useful improve discrimination models. This could be seamlessly integrated into...

The Sichuan Basin is China’s largest natural gas-producing basin and presents significant challenges for deep oil gas exploration due to its complex geological conditions. Recent studies in the Northeast Basin, particularly Kaijiang-Liangping (KJ-LP) Trough, have identified presence of strike-slip faults which may influence deposition reefs shoals. Understanding controlling these fault zones on distribution development hydrocarbon reservoirs crucial effective exploration. Traditional...

Abstract. Elastic anisotropy is frequently used to characterize fracture distribution. However, sets of parallel horizontal fractures and thin shale beds in tight sand can both cause vertical transverse isotropy. Here, we are not referring layers on the logging scale but rather very beds, a few centimeters thick, within sand. To accurately differentiate caused by or propose hybrid rock physics model. This new model combines Hudson shale-compacting orientation distribution function (ODF)...

On 5 September 2022, an Ms6.8 magnitude earthquake occurred in Luding County, Sichuan Province, China. Based on Sentinel-1 SAR images, this paper uses the D-InSAR approach to obtain displacement field of earthquake, invert coseismic sliding distribution, and then calculate static coulomb stress changes deformation aftershock distribution surrounding faults. Further, seismic structure is analyzed discussed. The InSAR demonstrates that maximum LoS surface caused by about 15 cm. Ms 6.8...

Deep carbonate reservoirs are attractive targets for gas development. These deeply buried, and commonly possess strong heterogeneity poor seismic data quality, making the identification of favorable production areas (“sweet spots”) challenging. Furthermore, sedimentary facies fault systems markedly impact reservoir identifying these features in is also crucial sweet spot identification. To solve problems, we propose a dual-factor-controlled method with two steps. First, faults identified...

Recently, the “sweet spot” of a fractured reservoir, controlled by strike-slip fault, has been found and become favorable target for economic exploitation deep (>4500 m) tight gas reservoirs in Sichuan Basin, Southwestern China. However, hidden faults small vertical displacements (<20 are generally difficult to identify using low signal–noise rate seismic data subsurfaces. In this study, we propose processing method improve imaging fault central Basin. On basis multidirectional...

The most common method for interpreting strata with seismic data is to relate the peaks and troughs of adjacent traces based on waveform characteristics. This can be captured by machine learning deep methods stratigraphic segmentation as many people investigated in industry. However, spatial variability instability signals increases difficulty applying this technology. In addition, nonlinear relationship complicated subsurface geological setting make it more difficult. Thus, we propose a new...

The Least Squares Reverse Time Migration (LSRTM) can obtain high resolution and true amplitude imaging results. However, LSRTM for full model domain data requires simulation throughout the entire space, resulting in significant computational costs. In addition, Born approximation, which is based on single scattering theory, cause artifacts by treating multiple reflections from overburden as primary reflections. To address these issues, Marchenko redatuming method be used to separate...

Although faulting is usually discontinuous for some geologic environments, many faults or parts of the are weak discontinuities even invisible in seismic images due to resolution and noises. Traditional fault detection methods often lead blurred, low-integrity attributes. These blurred attributes may hinder insights into interpretation. We develop a multiscale multidirectional enhancement method called steerable pyramid tensor voting (SPTV) overcome this difficulty. The proposed consists two...

In seismic exploration of subsurface hydrocarbon reservoirs, migrated images are the foundation structural interpretation and subsequent inversion for reservoir properties. Seismic events in can be mispositioned due to several factors, such as velocity inaccuracy. The lead poor well-seismic tie degrade accuracy prediction. Particularly, mistie quite obvious mid- mature-phases development after many wells drilled. We propose using information from between synthetic traces improve thus...

The Marchenko method can retrieve Green’s functions among virtual sources in the subsurface and receivers at surface from single-sided reflection data. This process, called redatuming, allows estimation of full-wavefield information inhomogeneous subsurface. retrieved form input for creating image free artifacts caused by internal multiples. However, when using crosscorrelation imaging condition imaging, shallower regions obtained suffer reduced resolution due to unwanted interference, which...

Conventional amplitude versus offset (AVO) inversion methods are mainly based on various Zoeppritz approximations. The assumptions of small contrast and linear relationship lead to the most being difficult have high accuracy. In this article, exact equation is used establish prestack method under Bayesian framework. It integrates multisource information generate posterior distributions P-, S-wave velocity density. theory, prior model works as regularization term which has a strong effect...

The 8 August 2017 Ms 7.0 Jiuzhaigou earthquake was generated in the transition zone between Tazang fault, Huya and Minjiang all being part of East Kunlun fault system. In this study, two pairs SAR (synthetic aperture radar) data from Sentinel-1 satellite were used to derive surface displacement observations along line-of-sight (LOS) directions using differential interferometric (D-InSAR) method. A steerable pyramid filtering method (i.e., a for linear multiscale, multidirectional...

The Cuonadong dome located at the eastern part of Tethyan Himalaya consists three lithologic‐tectonic units from inside to outside: lower, middle, and upper units. large‐scale Be‐W‐Sn deposits are hosted in strong shear zone middle unit dome. In this study, multi‐scale gravity magnetotelluric data were used generate two‐dimensional electrical resistivity models three‐dimensional density for deep structure results show that interpretation geophysical on is largely consistent with lower gneiss...

Time-lapse (4D) seismic is a tried and tested method to monitor fluid changes in producing reservoir, but its effectiveness reliability depend on the quality repeatability of surveys. It still has significant limitations when applied land for monitoring some deep reservoirs (depth >1000 m) where production rates are low many other factors unfavorable effective 4D acquisition, processing, interpretation. Modern high-density, wide-azimuth, multi-component data-acquisition techniques have...

Abstract Traffic noise is an important type of passive seismic data because it usually includes strong dispersive surface wave components and can be easily accessed. It used to extract virtual waves via interferometry algorithms for the purpose imaging subsurface shear velocity distribution. In this paper, we propose a scheme improve retrieval from traffic recorded using linear arrays along roads. By deconvolving decomposed wavefield, robust traces computed short record. First far‐field...

PreviousNext No AccessSEG Technical Program Expanded Abstracts 1996Seismic inversion using heuristic combinatorial algorithm: A hybrid schemeAuthors: Xuri HuangMohan KelkarXuri HuangWestern Geophysical and Mohan KelkarUniversity of Tulsahttps://doi.org/10.1190/1.1826548 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Permalink: https://doi.org/10.1190/1.1826548FiguresReferencesRelatedDetailsCited BySimulated...

Editorial Note: Please note that publication of this work, originally presented at the SEG 2018 Reservoir Geophysics Workshop, was delayed due to late receipt copyright transfer. Machine learning is a new development for seismic data analysis. In paper, Recurrent Neural Network (RNN) used machine study lithotype. deep network model widely process sequential data. With artificial intelligence in recent years, neural networks have achieved remarkable applications language processing, speech...

The reaction of 3C2 radical with NO molecule is studied at the B3LYP/6-311G(d) level theory. Both doublet and quartet potential energy surfaces (PES) are considered. On surface, we obtain four major pathways in which + ⇌ 1 CCNO → 2 (NC)CO 3 CNCO P1 CN CO 4 CC(NO) have lower energetics than other two that form 3O atom, namely P2 2CCN 5 ON(CC) P3 2CCNring. However, latter may compete former pathways. calculated account for experimental results primary product low temperatures main higher...