Table 1 shows the average bulk densities for a Miocene in the Tucano Region, Northeast Brazil. Assume an average matrix density of 2.60 g/cm3. The normal pore pressure is 0.452 psi/ft. Table 2 shows the interval-transit times for a prospect in the region. Figure 1 shows the assumed Poisson's ratio for the region.
Depth Bulk Dens. ft g/cm³
0 2.046
1000 2.143
2000 2.233
3000 2.300
4000 2.353
5000 2.392
6000 2.430
7000 2.460
8000 2.482
9000 2.497
10000 2.510
11000 2.522
12000 2.533
13000 2.543
14000 2.552
15000 2.560
16000 2.567
17000 2.573
18000 2.578
19000 2.582
20000 2.585
21000 2.587
22000 2.588
4000 to 5000 |
98 |
5000 to 6000 |
93 |
6000 to 7000 |
86 |
7000 to 8000 |
84 |
8000 to 9000 |
84 |
9000 to 10000 |
78 |
10000 to 11000 |
75 |
11000 to 12000 |
80 |
12000 to 13000 |
81 |
13000 to 14000 |
84 |
14000 to 15000 |
86 |
15000 to 16000 |
95 |
16000 to 18000 |
95 |
18000 to 20000 |
95 |
20000 to 21000 |
93 |
21000 to 22000 |
93 |
Table 2: Average interval-transit time for the Tucano Region.
Figure 1: Poisson's ratio for the Tucano region (assume overburden of 1psi/ft in shales).
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