Lab 10 Document - Andrew Ng
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School
Stony Brook University *
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Course
112
Subject
Geology
Date
Jan 9, 2024
Type
Pages
3
Uploaded by ChefTitanium1370
Case 1:
a) First, create as complete a stratographic column as you can. List all
formations, one per row and top to bottom. For each, indicate its
approximate thickness. Why is the Coram Conglomerate so thin in boreholes
C & D? Why is Brookhaven Sandstone not encountered at all in boreholes A
& B?
a) Turn in a drawing of the structure
b) What is the overall structure here?
The overall structure here is a fold, but more specifically it is an anticline
c) At about what X(W-E position), and about how deep is the top of the deeper
sandstone
I think that the deepness of the top of the deeper sandstone is around 400m because
when looking at the Brookhaven sandstone on the plot, the borehole C’s peak is at
700m
d) Assuming that the strike of the structure is N-S, what is the direction and
approximate angle of the dip at the base of the Laurel Limestone at X =:
(a) 200m = 23-24 degrees, direction South
(b)400m = Around 10 degrees, direction South
(c) 600m = Around 1-2 degrees, direction South
(d)800m = Around 20-22 degrees, direction South
Case 2:
a) Create a complete stratigraphic column, just like you did for case #1
b) Identify places where a formation is missing, or anomalously thick or thin
The Toll Conglomerate is missing in Borehole C, and Langmuir Limestone is also
missing in Boreholes D & E
c) Identify places where sets of formations repeat.
Borehole B: Stony Brook Sandstone & Seawolf Shale repeats
Borehole C: Stony Brook Sandstone, Seawolf Shale, and Harriman Shale repeats
Borehole D: Stanley Sandstone, Javits Limestone, Harriman Shale, Stony Brook
Sandstone repeats
Borehole E: Toll Conglomerate, Stanley Sandstone, Javits Limestone, and
Harriman Shale repeats
d) Identify places where sets of formations repeat. If the normal sequence
(bottom to top) is ABCDEF, but instead you see ABCDECDEF, where in
that sequence is there a fault?
There is most likely a fault sequence in Borehole C, the depths where the fault
probably occur is around 470-620 meters.
e) From that, identify some (X, Z) locations where there is a fault, and draw
that fault on your cross-section
f) Describe how the fold is like the one in case #1. How is it different?
I think the fold is also somewhat of a anticline, but on my map in this fold there are
a lot of repeated layers, or faults, so it seems like it could be different by also being
something like an overturned fold.
g) What type of fault is there? Assume that the strike of the fault is N-S.
I think it’s a Strike-Slip Fault
h) What is the dip of the fault?
20-30 degrees South
i)
Note that the offset of the fault by examining how the top or bottom of a
formation was displaced by slip along the fault.
i)
What is the heave of the fault
Around 200m
ii)
What is the throw of the fault
Around 100m
iii)
What is the offset along the fault
Around 100m
iv)
What formation did you base these measurements on
Borehole C & D,
with Stony Brook Sandstone at depths 470-620 for Borehole C and
650-720+ for Borehole D
j)
You need to decide on two of the best places to drill into the Stony Brook
Sandstone. Decide on the X values and minimum depths of these two wells
in order to reach the oil reservoirs. Draw them in. Explain your answers.
For location 1, the best location is in Borehole B with minimum depth of 290
meters to 450 meters. The thickness from this sandstone could suggest to a higher
chance of hitting oil reservoirs in this layer. For my second location, it’s in
Borehole C with minimum depth of 470 to 620 meters. Also like location 1’s I
selected this also as the best spot to drill because of the thickness and continuity of
the Sandstone, which overall a thick layer of sandstone like the Stony Brook
Sandstone may increase its chances of oil within that layer
k) Turn in copy of drawings of the structure. Remember to draw in two wells
from part (i)
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