The purpose of this exercise is to enable you to:
- Correlate wells using Spontaneous Potential and Resistivity well logs and a greater vertical spread of the La Pascua Section than in Exercises 1, 2 and 3.
- Subdivide the sedimentary section characterized by the well logs on the basis of the prominent correlatable surfaces (TS, mfs and SB) you can identify.
- Using these surfaces identify the parasequences within the sedimentary section characterized by the well logs and interpret the history of their evolving depositional settings.
- Describe the role of relative sea level in forming the resulting depositional settings utilizing the report on the geologic setting of the La Pascua Formation, the introduction to the sequence stratigraphy of the La Pascua Formation and the eustatic chart.
Pdf files containing wells logs and a base map can viewed on electronic media that include PC, Notebook, Tablet, or Pad. Exercises can be interpreted with Power Point. Power Point drawing tools, in particular "curve". This is an effective and easy way to handle the objectives of the exercise and a means for collective viewing of results in class. Click on red box for more details. The output can also be printed,on a large frame plotter and interpreted by hand. These exercise illustrations are quite large (up to 500K in some cases) and they may take a little time to be displayed. Patience will be rewarded!!!!
The clickable map below is linked to a pdf file which locates the five wells (me333, me296, me428, me313 and me 486) within the central portion of the Northern Strike Line
As an alternative this map can also be viewed by clicking on the link to a large .jpg file
Use the Spontaneous Potential and Resistivity logs displayed on the .pdf file of the cross section 5 wells Guarico linked to the clickable thumbnial.
As an alternative the above .pdf file this cross section can also be viewed by clicking on the link to a large .gif file
You can also view and/or print a smaller version of these files by using your vizualization software to shrink the images to fit your printer.
A report describing the high-frequency (fourth-order cycles) sequence stratigraphy and regional geology of this region is provided in the geologic setting of the La Pascua Formation, the introduction to the sequence stratigraphy of the La Pascua Formation and the eustatic chart.
A set of maps of previously interpreted wells is also provided to enable the construction of sand thickness isopachs for each of the intervals. Please refer to the basemap for the location of all the wells.
Utilize the Gulf Coast slip-slide method to help you match the log sections and identify the same geologic events on the various wells.
- Don't forget to use the left and right keyboard arrows to control the forward and backward motion of the movie so you can review this as you view it!
- Provide an overall analysis that describes your conclusions.
As with the earlier three exercises (Exercise 1,Exercise 2andExercise 3) to help with your interpretation of the well logs you should both view the movies and read the earlier sections related tothe geologic setting of the La Pascua Formationandthe introduction to theSequence Stratigraphy of the La Pascua Formation. From these you will gain knowledge of the depositional setting of these rocks. You should combine the techniques outlined above with your understanding of the regional geology and the vertical and lateral facies relationships in near shore clastic settings (eg.shoreline,beach,stacked beaches,tidal flats,deltas) andWalther's Law. You should use these to build a depositional model and a sequence stratigraphic interpretation of the well log section