Showing papers in "Exploration Geophysics in 2019"
TL;DR: In this article, a reservoir prediction method based on unsupervised learning and color feature blending is proposed to exploit the different responses of compressional and shear waves to the reservoir, in conjunction with color blending and fusion technology applied to seismic images, to improve the accuracy of reservoir characterisation.
Abstract: Multi-attribute analysis of multi-component seismic data can provide abundant information on seismic hydrocarbon reservoirs. It can exploit the different responses of compressional and shear waves to the reservoir, in conjunction with colour blending and fusion technology applied to seismic images, to enable the human eye to better discriminate features in seismic data, thereby improving the accuracy of reservoir characterisation. The integration of multi-component data and sophisticated visualisation techniques helps to reduce the number of possible models of the reservoir. Thus, we designed a reservoir prediction method based on unsupervised learning and colour feature blending. First, a large number of compressional and shear wave seismic attributes were extracted using cluster analysis to conduct unsupervised learning to optimise the attributes. Then, using the different responses of compressional and shear waves to oil and gas, and an understanding of rock physics, three types of composite at...
32 citations
TL;DR: In this paper, the authors recorded magnetotelluric data at 104 sites between 2015-2018 in northern Sweden to image the geoelectrical upper and lower crustal structures.
Abstract: Broadband magnetotelluric data were recorded at 104 sites between 2015-2018 in northern Sweden to image the geoelectrical upper and lower crustal structures. Data processing was performed using a r ...
20 citations
TL;DR: In this paper, the authors proposed a CO2 injection in oil reservoirs as an effective EOR and CO2 storage technique, while oil recovery and CO 2 storage potential of this technique at the core scale has been wid...
Abstract: CO2 injection in oil reservoirs has been widely accepted as an effective EOR and CO2 storage technique. While oil recovery and CO2 storage potential of this technique at the core scale has been wid...
16 citations
TL;DR: In this article, a new method for the interpretation of magnetic sources is developed using magnetic gradient tensor data, where the total magnetisation direction of each magnetic source is estimated, and the magnetic sources are interpreted using a tensor tensor model.
Abstract: In this paper, a new method for the interpretation of magnetic sources is developed using magnetic gradient tensor data. The total magnetisation direction of each magnetic source is estimated, and ...
14 citations
TL;DR: The VMD-based TFPF (VMD-TFPF) method to suppress random noise is proposed and Synthetic and field seismic data examples are employed to illustrate the superior performance of the proposed method in attenuating random noise and preserving the desired signal.
Abstract: Random noise suppression is of great importance in seismic processing and interpretation, and time–frequency peak filtering (TFPF) is a classic denoising approach. In TFPF, pseudo Wigner–Ville dist...
12 citations
TL;DR: In this paper, surface wave propagation can be exploited to investigate subsurface conditions in terms of shear wave velocities in a number of possible applications (geotechnical site characterisation, se...
Abstract: Surface wave propagation can be exploited to investigate subsurface conditions in terms of shear wave velocities in a number of possible applications (geotechnical site characterisation, se...
12 citations
TL;DR: In this paper, the applicability of ground-based synthetic aperture radar (GB-SAR) as an early warning system for landslide monitoring is discussed and the effectiveness of the differential in...
Abstract: In this paper, the applicability of ground-based synthetic aperture radar (GB-SAR) as an early warning system for landslide monitoring is discussed. The effectiveness of the differential in...
12 citations
TL;DR: The present approach of adding more input features, increasing number of training dataset and efficient implementation of algorithm have improved facies prediction accuracy significantly on a blind well.
Abstract: Accurate and precise identification of lithological facies is vital to understand geological variation in a proven reservoir. Four specific different machine learning (ML) classification algorithms...
10 citations
TL;DR: In this paper, the responses of the magnetotelluric (MT) method in anisotropic media have been studied, and they have focused mainly on one-dimensional and two-dimensional (2D) s...
Abstract: It is important to study the responses of the magnetotelluric (MT) method in anisotropic media. However, MT anisotropy research has focused mainly on one-dimensional (1D) and two-dimensional (2D) s...
9 citations
TL;DR: Dipole-dipole resistivity and induced polarisation surveys were conducted over a conductor identified from an audiomagnetotelluric (AMT) survey run in a greenstone schist belt of the Dhanjori...
Abstract: Dipole–dipole resistivity and induced polarisation (IP) surveys were conducted over a conductor identified from an audiomagnetotelluric (AMT) survey run in a greenstone schist belt of the Dhanjori ...
9 citations
TL;DR: In this article, full waveform inversion (FWI) is used for reconstructing high-resolution subsurface parameters estimated by iteratively minimising the difference between calculated and observed features.
Abstract: Full waveform inversion (FWI) is a powerful tool for reconstructing high-resolution subsurface parameters estimated by iteratively minimising the difference between calculated and observed ...
TL;DR: Loop is a new open source 3D geological and geophysical modelling platform in full development based on probabilistic modelling and allows for the definition of an objective function for geology and quantification of uncertainty via posterior probabilities.
Abstract: Loop is a new open source 3D geological and geophysical modelling platform in full development.The new platform consists of 4 main work packages: Knowledge Management: use of AI techniques for know...
TL;DR: The majority of discharged mine waste from the Mt Lyell copper mine was deposited as deltaic sediments at the mouth of the King River, Macquarie Harbour, Tasmania as mentioned in this paper.
Abstract: The majority of discharged mine waste from the Mt Lyell copper mine was deposited as deltaic sediments at the mouth of the King River, Macquarie Harbour, Tasmania. These waste materials are compose...
TL;DR: In this paper, the presence of smooth boundaries has often been a strong criticism and this smoothness can easily be remedied by smoothing the boundary with a smoothed boundary boundary and a smooth boundary.
Abstract: Although 3D airborne electromagnetic inversions have improved greatly in recent years, the presence of smooth boundaries has often been a strong criticism. This smoothness can easily be remedied by...
TL;DR: In this article, the authors apply seismic interferometry to a strong ground motion record, where the number of available records is limited compared with the available ambient noise records, in order to obtain the ground motion data.
Abstract: If seismic interferometry is to be applied to a strong ground motion record, the number of available records is limited, compared with the number of ambient noise records. To begin with, we investi...
TL;DR: In this paper, advanced surface wave analysis for multichannel and multishot seismic data was applied to estimate S-wave velocity structure with high lateral resolution, and the results showed that a horizontally layered structure is more robust than a vertically layered structure.
Abstract: We applied advanced surface wave analysis for multichannel and multishot seismic data to estimate S-wave velocity structure with high lateral resolution. Although a horizontally layered structure i...
TL;DR: In this article, the authors used combined data from X-Ray Transmission and X-ray Fluorescence, automatically measuring the weight, and performing 3D tomography of the core at the same time.
Abstract: Scanning drill cores using combined data from X-Ray Transmission and X-Ray Fluorescence, automatically measuring the weight, and performing 3D tomography of the core at the same time, gives a high-...
TL;DR: In this article, the reflection dispersion signatures of a heterogeneously patchy saturated reservoir exhibiting attenuation and velocity dispersion in a seismic range of frequency were studied, and a modifi...
Abstract: We have studied the reflection dispersion signatures of a heterogeneously patchy saturated reservoir exhibiting attenuation and velocity dispersion in a seismic range of frequency. A modifi...
TL;DR: To improve the inversion results of roadway or tunnel transient electromagnetic detection data, particle swarm optimisation (PSO) and damped least squares (DLS) algorithms are combined in this article.
Abstract: To improve the inversion results of roadway or tunnel transient electromagnetic detection data, particle swarm optimisation (PSO) and damped least squares (DLS) algorithms are combined. Thi...
TL;DR: A late Jurassic pulse of igneous activity occurred within the Exmouth Subbasin, with several submarine volcanic extrusive centres evident, along with contemporaneous intrusive feeder systems as discussed by the authors.
Abstract: A late Jurassic pulse of igneous activity occurred within the Exmouth Sub-basin, with several submarine volcanic extrusive centres evident, along with contemporaneous intrusive feeder systems that ...
TL;DR: In this paper, the effects of electromagnetic induction in conductors proximal to drillholes at the Pyhasalmi volcanogenic massive sulphide (VMS) copper-−-zinc deposit located in central Finland, using electromagnetic fields generated by electrical power lines (50 Hz).
Abstract: The main goal of this research was to develop a simple method to observe the effects of electromagnetic induction in conductors proximal to drillholes at the Pyhasalmi volcanogenic massive sulphide (VMS) copper − zinc deposit located in central Finland, using electromagnetic fields generated by electrical power lines (50 Hz). The idea is that the mine geologist could interpret the 50 Hz measurements from several holes and infer the boundaries between rock types based on rock samples and the 50 Hz measurements. Three-component dB/dt coils were used to measure the time derivatives of the total electromagnetic field in deep drillholes. Thus, the primary field was present while taking measurements, or the induced field was not separated from the inducing field. Time-domain data were transformed to the frequency domain and three components (x, y, z) of the total 50 Hz magnetic field were extracted. The electromagnetic field down drillholes indicates anomalies, although the difference between the primar...
TL;DR: As part of the Natural Sciences and Engineering Research Council of Canada and Canada Mining Innovation Council (NSERC-CMIC) Mineral Exploration Footprint project, three selected magnetic inve...
Abstract: As part of the Natural Sciences and Engineering Research Council of Canada–Canada Mining Innovation Council (NSERC-CMIC) Mineral Exploration Footprints project, three selected magnetic inve...
TL;DR: In this paper, the authors performed impedance inversion on post-stack seismic data for reservoir prediction, which is one approach to reservoir prediction using post-stacked seismic data.
Abstract: Impedance inversion performed on post-stack seismic data is one approach to reservoir prediction. Conventional post-stack seismic data inversion has two main stages. Stage one involves deconvolutio...
TL;DR: In this paper, logging and biostratigraphic characterization of the Foura Sandstone type section, Timor-Leste, show it is Carnian-early Norian (Samaropollenites speciosus Zone).
Abstract: Summary The logging and biostratigraphic characterization of the Foura Sandstone type section, Timor-Leste, show it is Carnian–early Norian (Samaropollenites speciosus Zone). Sedimentary structures indicate a turbidite origin and petrographic analysis reveals a high proportion of volcanic lithic grains. Palynological material presents a variable preservation suggesting a complex pre-burial history involving longdistance transport. The presence of prasinophytes suggests anoxic and euxinic depositional settings.
TL;DR: In Western Australia, iron ore deposits are divided into three types, Channel Iron Deposits (CID), Detrital IRD, and Bedded IRD.
Abstract: In Western Australia, iron ore deposits are divided into three types, Channel Iron Deposits (CID), Detrital Iron Deposits (DID) and Bedded Iron Deposits (BID). The latter are hosted in the banded i...
TL;DR: The data sources used in microseismic locating include mainly the arrival time or waveform (wavefield value) in the micro seismic record, and the algorithms used are mainly inversion or reve...
Abstract: The data sources used in microseismic locating include mainly the arrival time or waveform (wavefield value) in the microseismic record, and the algorithms used are mainly inversion or reve...
TL;DR: Exploring for the Future is a four-year, $100.5 million initiative by the Australian Government conducted in partnership with state and Northern Territory government agencies and universities as discussed by the authors.
Abstract: Exploring for the Future is a four-year $100.5 million initiative by the Australian Government conducted in partnership with state and Northern Territory government agencies and universities that a...
TL;DR: The deployment of new AuScope passive seismic experiments in 2019 are transforming seismic data coverage across South Australia and Lake Eyre Basin, coinciding with additional geophysical surveys in the region such as AusLAMP as discussed by the authors.
Abstract: Summary The deployment of new AuScope passive seismic experiments in 2019 are transforming seismic data coverage across South Australia and Lake Eyre Basin, coinciding with additional geophysical surveys in the region such as AusLAMP. The array of 40 seismometers will eradicate a major gap (or blind spot) in the national seismic network. A range of seismic imaging techniques will be applied allowing for the nature of a suspected continental weak zone between the Gawler Craton and Lake Eyre Basin to be determined. Not only is this weak continental boundary associated with a recent surge of seismic activity, but is also home to some of the most valuable mineral resources in Australia (e.g. Olympic Dam, the world’s largest uranium deposit, and the 4th largest copper deposit).
TL;DR: Using the stress-strain oscillation method, the authors conducted experiments on a sandstone over a frequency range of 1-100Hz at a differential pressure of 5-MPa to investigate the effects of oil saturati...
Abstract: Using the stress–strain oscillation method, we conducted experiments on a sandstone over a frequency range of 1–100 Hz at a differential pressure of 5 MPa to investigate the effects of oil saturati...
TL;DR: Controlled-source audio-frequency magnetotellurics (CSAMT) is an important geophysical technique as discussed by the authors, and many studies have shown that the electrical anisotropy in the Earth cannot be ignored.
Abstract: Controlled-source audio-frequency magnetotellurics (CSAMT) is an important geophysical technique. Numerous studies have shown that the electrical anisotropy in the Earth cannot be ignored because i...