Geology Reference
In-Depth Information
Fig. 6.58.
Cross section through the Burma No. 1 and 2 wells.
Short lines
are surface dips. Letters
A
-
G
are marker horizons seen at the locations of dip measurements that can be correlated.
Arrows
point to
locations where markers can be identified in outcrop but the dip cannot be measured. The dips in the
wells are from oriented cores
6.9.7
Predictive Cross Sections from Bedding Attitudes and Tops
Complete the cross section in Fig. 6.58, keeping bed thicknesses constant. Use both the
dip-domain technique and the method of circular arcs. Scan the section into a com-
puter and complete using the smooth curves provided by a drafting program. Com-
pare the results of the different techniques.
6.9.8
Fold and Thrust Fault Interpretation
Construct illustrative cross section A-A' from the map in Fig. 3.29 using the struc-
ture contour map constructed in Exercise 3.7.4. Use the dip-domain technique to
construct the same cross section using only the surface geology along the profile. Use
the circular arc technique to construct the same cross section using only the sur-
face geology along the profile. What is the plunge of the central portion of the struc-
ture from a stereogram or tangent diagram? Project the northern part of the struc-
ture onto section B-B' using the method of along-plunge projection. Compare and
contrast the cross sections. The wells to the Fairholme were drilled to find a hydro-
carbon trap but were not successful. Use the map and cross sections to determine a
structural reason for drilling the wells and a structural reason that they were unsuc-
cessful.
6.9.9
Projection
Project the top reservoir onto the seismic line assuming the structure is normal to the
seismic line (Fig. 6.59). Project the top reservoir onto the seismic line assuming the
structure plunges 10° in the direction 225°.
