The terms isopach and isopach map are incorrectly used interchangeably to describe isochores and isochore maps. Isopachs and isochores are equivalent only. Commonly, the isopachs, or contours that make up an isopach map, display the See: contour, contour interval, contour map, formation, isochore, reservoir. true vertical thickness is an isochore map. Note that in common practice, isochore maps are informally referred to as “isopach” maps.

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Isochore and isopach maps are two different types of thickness map.

Isopach and isochore describe a map showing the thickness of a unit in the subsurface. But it would be telling us quite a lot already; for starting, we could think we are dealing with a parallel fold formed by flexural flow for example.

Grammy will be at 5: Oil and natural gas are found in the small spaces between the grains in a sedimentary rock. Registration Forgot your password? Vertical thickness increased with increasing dip angle and when dip angle is zero the true thickness and vertical thickness are equal. If you wish to download it, please recommend it to your friends in any social system.

You are also welcomed to write some contribution! Under Inputsclick the plus to add three horizons, these horizons will include your two depth horizons, along with your dip angle map for the top horizon. Thank you for the post. Another error may come from working with seismic surveys and not realising that if you take a surface representing a top unit, and you substract another surface representing a bottom unit, the result is a isochore map, not a isopach map.

If we consider vertical thickness in an isochore map, we can only project a given value to a single point in the surface.

### Isopachs, Isochores, and Isochrons | Learning | DUG Insight User Manual

Red colour indicates minimum vertical thickness, whilst purple shows maximum value. It would be a pretty boring map: To collect data necessary for the construction of a geologic map and cross-section of. I surprised with analysis research you focused on this into particular put up amazing. This sounds easy enough, but it doesn’t make for a perfect correction, because it’s not always obvious how to compute the dip upper surface?

Retrieved from ” https: We can see that the difference between an isopach map and an isochore map is quite obvious and simple to understand. After data islpach been depth converted, isopachs maps show a more geologically accurate portrayal of stratigraphic interval thicknesses. Dip angle is automatically calculated for depth horizons and can be found under the Property menu for your horizon. For the formula, use: If you have any question, just ask in the comments.

Overlaying depth structure contours can give a clear picture of where stratigraphic thicknesses occur in relation to structural highs. Both types of maps show the thickness between two mapped surfaces, but differ in how the thickness is measured.

## Isopach and Isochore Maps

And this is considering that everytime we read a vertical thickness in a well log the well was actually vertical and not deviated at all. But, as you say, the problem comes with real thickness.

Letters can also be used as variables to simplify the formula. With increasing dip, the difference between vertical idochore and stratigraphic thickness measurements becomes larger.

I’ve tried in the past to correct an isochore map to an isopach map by multiplying by the cosine of the dip.

### Isopach and Isochore Maps – ppt video online download

You can help Wikipedia by expanding it. There are two options for how to save the result. Ebrahim Basic Petroleum Technology. I have a question though, if the upper and lower bounds are non-parallel, is it safe to say that one cannot create an isopach map of the structure, andd we would either be measuring a point perpendicular to the upper or lower bound, but not to both.

It is very crucial for the hydrocarbon industries to document the lateral changes in the layer thickness. Isopachs, Isochores, and Isochrons.