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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It is measured as the shortest distance between the two surfaces.

Isopachs are contour lines of equal thickness over an area. We can see that the difference between ispach isopach map and an isochore map is quite obvious and simple to understand. Isochore map for the yellow unit in figure 1. Structural Contours over Amplitudes Next: There are two options for how to save the result.

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. Unfortunately, some people interchange both terms, and isohore many times we can see isochore maps refered to as “isopach maps” If we would get the map from figure 2and somebody would tell us that this is a isopach map over and anticline, we could wrongly conclude that the real thickness around the hinge line of the fold is smaller than in the flanks, and we would probably think that we have in front of us as growth anticline, for example.


I am happy to find your distinguished way of writing the post. And that wouldn’t necessarily be a huge problem, if I didn’t suspect that it reveals a basic misunderstanding of what has been mapped.

Isopach maps display isochoe stratigraphic thickness between an upper and lower horizon. Thus, an isochore and isopach map are the same only when both the top and bottom surfaces of the layer shown are horizontal.

Isochore and Isopach Maps – Applied Subsurface Geological Mapping [Book]

I will ensure that I bookmark your blog and will eventually come back in the foreseeable future. An isopach is iwochore line that connects points of equal true thickness i.

Jurassic shales of the Weald Basin: Please help me understand. Isochore and isopach maps are two different types of thickness map. Better not even to know it! Newer Post Older Post Home. To make this website work, we log user data lsopach share it with isolach.

Oil and natural gas are found in the small spaces between the grains in a sedimentary rock. 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? They represent thickness variations and thickness trends of a given unit. Red colour indicates minimum vertical thickness, whilst purple shows maximum value.

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To make it clear from the beginning: Well 2 cuts the bed where is horizontal, and therefore the vertical thickness equals the real thickness. If you wish to download it, please recommend it to your friends in any social system. Isopach maps provide a more accurate picture of stratigraphic thickness, because it reflects the thickness of the deposited bed. The solid lines represent the structure xnd of the upper surface of the sandstone and the dash lines represent its lower surface.


Now you make it easy for me to understand and implement the concept.

Share buttons are a little bit lower. An isopach map illustrates thickness variations within a tabular unit, layer or stratum. Thanks for the comments, is very welcome! For the formula, use: To calculate the isochron, or time interval map, subtract the top horizon time from the base horizon time.

This geology article is a stub. Dip angle is automatically calculated for depth horizons and can be found under the Property menu for your horizon. With very beautiful girls, we launch the Mumbai Escorts Service in which our Mumbai Escort Agency will present you to meet people who are fully convinced of the way we provide escort services in Mumbai, there are a high quality and high profile.

Letters can also be used as variables to simplify the formula.