SEISMIC EXPLORATION OF THE DENVER‐JULESBURG BASIN

Geophysics ◽  
1952 ◽  
Vol 17 (2) ◽  
pp. 334-343
Author(s):  
B. F. Rummerfield
Keyword(s):  
Seismic Activity ◽  
Resolving Power ◽  
Seismic Exploration ◽  
Velocity Variation ◽  
Seismic Method ◽  
Subsurface Structures ◽  
Weathered Zone ◽  
Recent Developments ◽  
Elevation Changes

Recent developments in northeastern Colorado and southwestern Nebraska have resulted in a marked increase in seismic activity within the Denver‐Julesburg Basin. The low relief of many of the subsurface structures, coupled with the extraneous effects of weathered zone, elevation changes, surface deposits, and velocity variation taxes the resolving power of the seismic method and the interpretative ability of the geophysicist.

Seismic method

Geophysics ◽  
1980 ◽  
Vol 45 (11) ◽  
pp. 1619-1633 ◽  
Author(s):  
S. J. Allen
Keyword(s):  
Channel Capacity ◽  
Three Dimensional ◽  
Resolving Power ◽  
Seismic Exploration ◽  
Seismic Method ◽  
Time Period ◽  
Practical Reality ◽  
History Of ◽  
Entire History

The fifty years from 1930 to 1980 almost completely cover the entire history of the reflection seismograph exploration industry. During its growth from infancy to maturity there have been many major technological breakthroughs and innumerable evolutionary advances. At the conclusion of any time period, there is a tendency to believe that the peak has been reached, only to see significant breakthroughs which start a whole new round of amazing developments. So it is today with a veritable explosion of channel capacity in the recording systems and three‐dimensional surveys finally just becoming a practical reality. The prospects for major improvements in the resolving power of the seismic exploration method have probably never been better.

LIMITATIONS OF THE REFLECTION SEISMIC METHOD; LESSONS FROM COMPUTER SIMULATIONS

Geophysics ◽  
1970 ◽  
Vol 35 (4) ◽  
pp. 551-573 ◽  
Author(s):  
M. Turhan Taner ◽  
Ernest E. Cook ◽  
Norman S. Neidell
Keyword(s):  
Synthetic Seismograms ◽  
Seismic Exploration ◽  
Basic Approach ◽  
Seismic Method ◽  
Reflection Seismic ◽  
Recent Developments ◽  
Ground Coverage ◽  
Linear And Nonlinear ◽  
Interval Velocities ◽  
Made In

Piece‐wise local linearity of the subsurface reflectors and uniqueness of primary reflection travel path between particular source‐receiver pairs are two of the fundamental assumptions of multiple ground coverage reflection seismic techniques as currently employed. Some recent developments in seismic exploration which spring from the progress made in velocity determination techniques violate these fundamental assumptions with potentially serious consequences such as spurious geometries after migration and unrealistic interval velocities. In this paper we apply analytic techniques and computer simulation to linear and nonlinear subsurface models in order to obtain better definitions of the limitations of the reflection seismic method. The resulting lessons are of immediate practical value in seismic interpretation and clarify a variety of commonly occurring but puzzling situations such as phantom faults, incomplete contacts and segmented reflectors at unconformities, and apparent reversal of dip. In its basic approach this work has much in common with the generation and study of synthetic seismograms. Examination of the groundwork of the seismic method provides a firm base for extending its use.

scholarly journals Acquisition geometry analysis in complex 3D media

Geophysics ◽  
2008 ◽  
Vol 73 (5) ◽  
pp. Q43-Q58 ◽  
Author(s):  
E. J. van Veldhuizen ◽  
G Blacquière ◽  
A. J. Berkhout
Keyword(s):  
Grid Point ◽  
Seismic Inversion ◽  
Image Resolution ◽  
Seismic Exploration ◽  
Equation Modeling ◽  
Subsurface Structures ◽  
Detector Geometry ◽  
And Migration ◽  
Double Focusing ◽  
Geometry Analysis

Increasingly, we must deal with complex subsurface structures in seismic exploration, often resulting in poor illumination and, therefore, poor image quality. Consequently, it is desirable to take into consideration the effects of wave propagation in the subsurface structure when designing an acquisition geometry. We developed a new, model-based implementation of the previously introduced focal-beam analysis method. The method’s objective is to provide quantitative insight into the combined influence of acquisition geometry, overburden structure, and migration operators on image resolution and angle-dependent amplitude accuracy. This is achieved by simulation of migrated grid-point responses using focal beams. Note that the seismic response of any subsurface can be composed of a linear sum of grid-point responses. The focal beams have been chosen because any migration process represents double focusing. In addition, the focal source beam and focal detector beam relate migration quality to illumination properties of the source geometry and sensing properties of the detector geometry, respectively. Wave-equation modeling ensures that frequency-dependent effects in the seismic-frequency range are incorporated. We tested our method by application to a 3D salt model in the Gulf of Mexico. Investigation of well-sampled, all-azimuth, long-offset acquisition geometries revealed fundamental illumination and sensing limitations. Further results exposed the shortcomings of narrow-azimuth data acquisition. The method also demonstrates how acquisition-related amplitude errors affect seismic inversion results.

scholarly journals Recent developments of novel matrices and on-tissue chemical derivatization reagents for MALDI-MSI

2020 ◽  
Author(s):  
Qiuqin Zhou ◽  
Annabelle Fülöp ◽  
Carsten Hopf
Keyword(s):  
Mass Spectrometry Imaging ◽  
Organic Molecules ◽  
Resolving Power ◽  
Ionization Mass ◽  
Chemical Derivatization ◽  
Small Organic Molecules ◽  
Tissue Sections ◽  
Matrix Properties ◽  
Organic Matrices ◽  
Recent Developments

AbstractMatrix-assisted laser desorption/ionization mass spectrometry imaging (MALDI-MSI) is a fast-growing technique for visualization of the spatial distribution of the small molecular and macromolecular biomolecules in tissue sections. Challenges in MALDI-MSI, such as poor sensitivity for some classes of molecules or limited specificity, for instance resulting from the presence of isobaric molecules or limited resolving power of the instrument, have encouraged the MSI scientific community to improve MALDI-MSI sample preparation workflows with innovations in chemistry. Recent developments of novel small organic MALDI matrices play a part in the improvement of image quality and the expansion of the application areas of MALDI-MSI. This includes rationally designed/synthesized as well as commercially available small organic molecules whose superior matrix properties in comparison with common matrices have only recently been discovered. Furthermore, on-tissue chemical derivatization (OTCD) processes get more focused attention, because of their advantages for localization of poorly ionizable metabolites and their‚ in several cases‚ more specific imaging of metabolites in tissue sections. This review will provide an overview about the latest developments of novel small organic matrices and on-tissue chemical derivatization reagents for MALDI-MSI.

Some Remarks on Single-Channel and Multi-Channel Seismic in Offshore Engineering Geological Exploration

2014 ◽  
Vol 1065-1069 ◽  
pp. 1485-1490
Author(s):  
Qing Sheng Meng ◽  
Hong Li Li ◽  
Tao Liu
Keyword(s):  
High Resolution ◽  
Single Channel ◽  
Geophysical Methods ◽  
High Sensitivity ◽  
Seismic Exploration ◽  
Geological Investigation ◽  
Seismic Method ◽  
Offshore Engineering ◽  
Good Guide ◽  
Zero Offset

Single-channel and multi-channel seismic exploration have become two important geophysical methods in offshore engineering geological investigation. Both of the two methods can present high sensitivity and high resolution information about the strata under the seafloor. However, the single-channel seismic prospecting method has some limitations in high resolution engineering surveys. For example, (1) When the depth of water is relatively shallow, the system cannot get zero offset profile; (2) The reflective events will be distorted if the terrain of the seafloor is complex, and thus make the interpretation much more difficult; (3) We cannot remove the influence of the complex multiples in single-channel seismic data processing; (4) We cannot get the lithological and physical properties directly using single-channel seismic method; and, (5) The spatial resolution of single-channel is also lower than that of multi-channel seismic method. In this paper, we presented some examples, and the above problems have been discussed to compare the two methods. All those can give a good guide for selecting appropriate exploration methods.

Multiple Heart-Cutting Two-Dimensional Liquid Chromatography: Recent Developments and Applications

2020 ◽  
Vol 16 ◽  
Author(s):  
Brynish R. Dsouza ◽  
Alex Joseph ◽  
Subham Das ◽  
Angel T. Alex
Keyword(s):  
Liquid Chromatography ◽  
Pharmaceutical Industry ◽  
Method Development ◽  
Advanced Technology ◽  
Complex Mixtures ◽  
Resolving Power ◽  
Two Dimensional ◽  
Peak Separation ◽  
Recent Developments ◽  
Multiple Sample

Background: Over the last few decades, there has been a growing interest in Two-Dimensional Liquid Chromatography (2D-LC). This advanced technology has become a relevant solution for solving all the analytical challenges encountered in the pharmaceutical industry. The primary purpose of this review is to give a brief account of the developing techniques notable in 2D-LC. Methods: Review of recent literature on advanced separation techniques for complex mixtures reveled that 2D-LC is the most widely used technique in the pharmaceutical laboratory for the separation of complex samples. Among the various techniques used in 2D-LC, comprehensive 2D-LC and heart-cutting 2D-LC are highly used techniques. To enhance the resolution, further development made to heart-cutting 2D-LC called multiple heart-cutting 2D-LC, which has recently become a very popular technique in pharmaceutical industry. Therefore research articles mentioning the use of multiple heart-cutting 2D-LC for separation of complex mixtures were reviewed. Results: The most crucial benefit of multiple heart-cutting 2D-LC is its reduced effort on method development and also the heart cutting and storage of multiple sample sections for further analysis. The multiple heart-cutting 2D-LC is suited, preferably for method development on impurity analysis of pharmaceutical substances, fine chemicals and offer better peak separation, which was otherwise not possible by comprehensive 2D-LC. Conclusion: The advantage of two-dimensional liquid chromatography over one-dimensional liquid chromatography is its high resolving power. Further improvement in resolution was achieved by using the advanced multiple heart-cutting 2DLC and appear to have an imperative role in pharmaceutical and food analysis.

Addendum to: Quantifying resolving power of seismic systems

Geophysics ◽  
1983 ◽  
Vol 48 (12) ◽  
pp. 1687-1690
Author(s):  
M. B. Widess
Keyword(s):  
Theoretical Approach ◽  
Resolving Power ◽  
Seismic Exploration ◽  
The Subject

The subject paper (Widess, 1982) presents a quantitative formulation of the vertical resolving power of seismic exploration systems, and this formulation is offered as a proposed characteristic, or standard, resolving power identified with individual systems. The present Addendum supplements the theoretical approach in the subject paper by covering some closely related practical aspects.

scholarly journals Fault motions at the Baldwin Hills Reservoir site

1965 ◽  
Vol 55 (1) ◽  
pp. 165-180
Author(s):  
Donald E. Hudson ◽  
Ronald F. Scott
Keyword(s):  
Seismic Activity ◽  
Fault System ◽  
Motion Information ◽  
Ground Movements ◽  
The Past ◽  
Elevation Changes ◽  
The Relationship ◽  
Damaging Effects

Abstract A distinction is made between the damaging potential of rapid fault motions associated with earthquakes and those having a relatively slow creep type motion. Information is given on nonseismic movements that have been occurring on faults passing through the Baldwin Hills Reservoir during the past 10 years. The relationship between those faults and the Inglewood fault system is described, and correlations are presented with local elevation changes, horizontal ground movements, and seismic activity. Comparisons are made with similar slow fault motions occurring at other places in California, and attention is drawn to the potential damaging effects of such movements.

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