The types of sedimentary structures that that provide sediment dispersal information such as cross-bedding, bounding surfaces, slumps and rotated blocks will be discussed.
Examples of how rotated dip data can be used in palaeotransport and palaeoslope analysis and sand body architecture in different sedimentary settings will be shown. Clastic depositonal environments 20 minutes : Examples will be shown of borehole images from a number of clastic environments, namely aeolian, fluvial, shallow marine, deltaic and deep water systems.
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The key features that may be seen in borehole images and key interpretive challenges such as assessing structural dip from a dune sequence or palaeoslope orientation from a slumped deep marine system will be discussed. Thin bed analysis in clastic reservoirs 10 minutes : High resolution borehole image logs allow thin beds below the resolution of standard logs to be determined. Techniques for analysis of thin beds from on borehole images to generate an earth model will be presented.
Features that are not related to the geology of the formation are known as borehole image artifacts and are familiar to all image analysts. Artifacts are derived from a number of sources, including tool mechanics, acquisition parameters and borehole wall shape.
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An important subcategory of the latter is stress-induced artifacts, borehole breakout and drilling-induced fractures, which provide important geomechanical information. Separating drilling-induced from natural fractures is essential for accurate reservoir characterization but can be a very difficult task when both types of fractures are present.
This short course will discuss some of the accepted criteria for distinguishing between geological features and artefacts, with special focus on geomechanical features. Along with the presentation of our interpretation the audience will be invited to participate in discussion of the validity of the criteria used and to present their own experience and opinions.
Submarine Fans and Canyon-Channel Systems: A Review of Processes, Products, and Models
This 1 hour training course covers an integrated workflow for formation evaluation using the last image log technology available in Techlogy for facies textural analysis interpreted on electrical and ultra-sonic images logged in WBM or OBM. Through a combination of lectures and discussions the class will learn the principles of PoroSpect, PoroTex or VugDensity Analysis and their main quantitative outputs that measure the secondary porosity: Pore size, pore typing and pore connection.
PoroSpect: Porosity Spectrum Analysis. In this thesis, a quantitative analysis of trace fossils from the Early-Middle Eocene deep-marine clastic systems, Ainsa-Jaca basin, Spanish Pyrenees, shows that trace fossils are powerful discriminators of deep-marine fan and related environments. Sixteen fan and related environments have been recognised in the Ainsa-Jaca basin, from upper-slope gully to distal basin-floor.
In the more laterally confined and channel-dominated Ainsa basin, there is a trend of increasing bioturbation intensity and trace-fossil diversity away from channel-axis to off-axis environments. In the more unconfined and distal Jaca basin, there is a trend of increasing trace-fossil diversity and number of pre-depositional trace fossils including graphoglyptids from the channel-lobe transition to the fan-fringe.
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The trace-fossil assemblages of the Ainsa-Jaca basin are characteristic of a number of subichnofacies of the Nereites ichnofacies. In the distal Jaca basin, the Paleodictyon subichnofacies occurs in the lobe-fringe and fan-fringe, whereas the distal basin-floor has a trace-fossil assemblage typical of the Paleodictyon subichnofacies, but with a high proportion of post-depositional fodinichnia.
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Trace-fossil assemblages of proximal basin, axial, environments are characteristic of the Ophiomorpha rudis subichnofacies, whilst proximal off-axis environments, have a mixed Paleodictyon-Ophiomorpha rudis subichnofacies trace-fossil assemblage. In core, a detailed ichnofabric study of the proximal Ainsa channel system shows a clear trend of increasing bioturbation intensity and trace-fossil diversity from channel axis to levee-overbank.
Spectral analysis of bioturbation intensity in thin-bedded turbidites deposited in overbank and interfan environments from one of the wells A6 , suggests, for the first time from a siliciclastic turbidite succession at a tectonically active plate margin, a strong cyclicity interpreted to reflect the k. Milankovitch frequencies.
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- Siliciclastic reservoir geology.