What is a isochron map in geology?

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1. n. [Geophysics] A contour map that displays the variation in time between two seismic events or reflections.

What does an isochron map show?

An isochrone map in geography and urban planning is a map that depicts the area accessible from a point within a certain time threshold. ... In hydrology and transportation planning isochrone maps are commonly used to depict areas of equal travel time.

What are subsurface maps?

i. A map depicting geologic data or features below the Earth's surface; esp. a plan of mine workings, or a structure-contour map of a petroleum reservoir or an underground ore deposit, coal seam, or key bed.

What is geophysical map?

Geophysical maps provide insight into an area's geology by illuminating features and subsurface characteristics not apparent from a geologic map alone. ... Geophysical maps are used in geologic mapping, energy and mineral resource exploration, geothermal exploration, and groundwater monitoring.

Why are isopach maps important?

Isopach maps display the stratigraphic thickness between an upper and lower horizon. It is measured as the shortest distance between the two surfaces. Isopach maps provide a more accurate picture of stratigraphic thickness, because it reflects the thickness of the deposited bed.

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37 related questions found

What is an isopleth method map?

Isopleth maps simplify information about a region by showing areas with continuous distribution. Isopleth maps may use lines to show areas where elevation, temperature, rainfall, or some other quality is the same; values between lines can be interpolated.

How do I create an isopach map?

To construct an isopach map from borehole logs, one locates the top and bottom of the stratigraphic unit on a given log, subtracts the lesser depth from the greater, and plots the resulting thickness on a map. Repetition for each of the available logs generates the data that are then contoured on the map.

What are the geophysical methods of exploration?

Surface geophysical methods include magnetic, gravity, seismic refraction, seismic reflection, electrical resistivity, natural potential and,ground penetrating radar. The method(s) selected will depend on the type of information needed, the nature of the subsurface materials and cultural interferences.

What is geochemical mapping?

INTRODUCTION. Systematic geochemical mapping is the best available method to document changes in the levels of chemical elements in materials occurring at or below the Earth's surface, such as rock, soil, floodplain or overbank1 sediment, stream sediment, regolith2, stream water, ground water and vegetation.

What tools do geophysicists use?

Technologies used for geophysical surveys include:
  • Seismic methods, such as reflection seismology, seismic refraction, and seismic tomography. ...
  • Seismoelectrical method.
  • Geodesy and gravity techniques, including gravimetry and gravity gradiometry. ...
  • Magnetic techniques, including aeromagnetic surveys and magnetometers.

Which map is used to describe subsurface rocks?

A stratigraphic map, also known as a stratigraphic column, is a concise visual representation that describes the vertical (temporal) arrangement of rock units in a particular area.

What is a net pay map?

“Net” pay (see Effective pay determination) implies that some formation thickness has been excluded from consideration by either (1) occurring below an oil-water contact (or above a gas-water contact), or (2) having porosity and/or permeability values below a “cutoff” limit for productivity.

Who discovered the isochrone?

An examination of the improved accuracy of the isochronous pendulum over the simple pendulum is presented in Exercise 3.6. The Dutch clockmaker's discovery is perhaps all the more striking, since he arrived at his results before the advent of the calculus of Newton and Leibniz.

What is the isochron method?

Isochron dating is a common technique of radiometric dating and is applied to date certain events, such as crystallization, metamorphism, shock events, and differentiation of precursor melts, in the history of rocks. ... Indeed, the initial amount of the daughter product can be determined using isochron dating.

What is the objective of geochemical survey?

The objective of a detailed rock or residual soil geochemical survey is to locate precisely mineralized structures. For this purpose, a grid is laid over the prospective area, and systematic sampling of rock or residual soil is carried out.

What are the types of exploration?

Exploration Activities
  • Exploration Activities that do not need approval. ...
  • Exploration Activities that need further assessment and approval. ...
  • Geological mapping. ...
  • Desktop surveys. ...
  • Geophysical surveys. ...
  • Geochemical Surveys.

What are the method of exploration?

Boulder exploration, geological mapping in the field, geophysical surveys, geochemical sampling and drilling are examples of the methods we use in exploration to find new mineral deposits.

What do you mean by geophysical exploration?

Geophysical Exploration is an applied branch of geophysics that uses physical methods to measure the physical properties of the subsurface, along with the abnormalities in those properties at the surface of the earth.

What is lithofacies map?

Lithofacies maps show the areal variation in the depositional patterns that make up each genetic sequence within the reservoir interval. The method for constructing lithofacies maps involves extrapolating the lithofacies from the wells into the gaps between the wells.

What is a isopleth called?

a line drawn on a map through all points having the same numerical value, as of a population figure or geographic measurement. Also called isarithm.

What is Dot method?

Dot method is used when cartographing mass scattered events. When marking some quantity of units of the event is mapped with the help of dots or more precisely with the help of circles. They are placed on the map in such points where this event is directly occur.

What is the main aim of map?

The main aim of the maps is to show the location of a place, the distribution of variables and the distribution of people.

What is the difference between contour map and structure map?

1. n. [Geology]

Its appearance is similar to that of a topographic map, but a topographic map displays elevations of the Earth's surface and a structure map displays the elevation of a particular rock layer, generally beneath the surface. Datapoints and derived structure contour map.

How do you make a contour map?

The two ways to establish a contour map are the cross-section method and the trace contour method. To use the cross-section method, set a control or reference line at the center of the lot, then lay out and stake a grid; the elevation is determined at each stake in the grid relative to a benchmark.