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2011-08-04_HYDROLOGY - P2008046
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2011-08-04_HYDROLOGY - P2008046
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Last modified
8/24/2016 4:36:32 PM
Creation date
8/4/2011 2:04:47 PM
Metadata
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Template:
DRMS Permit Index
Permit No
P2008046
IBM Index Class Name
HYDROLOGY
Doc Date
8/4/2011
Doc Name
Pad cement evaluation
From
American Shale Oil, LLC
To
DRMS
Email Name
THM
DB2
Media Type
D
Archive
No
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Mr. Travis Marshall <br />Mr. Kent Walter <br />Ms. Wendy Cheung <br />Page 5 of 6 <br />bond is rated as good through the confining zone; the bond is rated as fair through the confining zone in <br />well TM -2. Although the CAST log does not extend to the casing point in most wells, it is reasonable to <br />assume that the cement to pipe bond rating within the interval between the bottom of the log and the <br />casing point is at least as good as the interval immediately above the bottom of the log. Therefore, no <br />cross -hole communication is expected through the confining zone in any of the wells. <br />Isolation of Hydrostratigraphic Units <br />Exploration work conducted to date at the AMSO site has shown that the shallowest water - bearing unit is <br />generally encountered within the transition zone between the Uinta Formation and the underlying R8 at a <br />depth of approximately 650 ft bgs. The transition zone contains Green River Formation shale (R8 zone) <br />and interbedded tongues of Uinta Formation sandstone, the water - yielding strata. Below the transition <br />zone, the R8 characteristically exhibits low permeability, yielding very little water compared to Uinta <br />Formation sandstone. Once the water - bearing zone is penetrated, the water level rises in the well bore, <br />indicating that the unit is under confined pressure. This water - bearing zone is referred to as the Uinta <br />hydrostratigraphic unit. <br />The hydrostratigraphic units identified at the TM Pad between the ground surface and the AMSO retort <br />test interval are as follows: <br />• Uinta (Uinta Formation/R8 transition zone beginning at about 600 ft bgs) <br />• A- Groove (962 — 974 ft bgs) <br />• B- Groove (1,113 —1,133 ft bgs) <br />• L5 (1,269 —1,337 ft bgs) <br />• L4 (1,529 — 1,570 ft bgs) <br />• L3 (1,726 —1,774 ft bgs) <br />The CAST logs and associated ACE reports demonstrate that the cement to pipe bond in each well is <br />adequate, with a reported Halliburton rating of "good" or "fair ", for the interval extending from the <br />bottom of the of the log to at least the upper R8 (at least 236 ft above the top of the A- Groove <br />hydrostratigraphic unit). These findings indicate adequate isolation of hydrostratigraphic units underlying <br />the Uinta hydrostratigraphic unit as well as isolation of the Uinta hydrostratigraphic unit from the <br />underlying hydrostratigraphic units. The cement to pipe bond in all of the wells is rated as "poor" through <br />some portions of the Uinta Formation. Except for well TM -3 and TM -4, the interval of adequate cement <br />to pipe bond extends to well above the Uinta hydrostratigraphic unit. The adequate bond interval extends <br />to slightly above the Uinta hydrostratigraphic unit in well TM -3. At TM -4, the top of cement was <br />estimated at a depth of approximately 700 ft bgs. The interval above the top of cement in well TM -4 <br />includes the Uinta Formation, Uinta Formation/R8 transition zone, and possibly a portion of the upper <br />R8. Therefore, the Uinta hydrostratigraphic unit is not isolated from the overlying Uinta Formation strata <br />and possibly the underlying upper R8 at well TM -4. The possible lack of isolation from the underlying R8 <br />poses little threat hydrologically or with respect to water quality since the R8 is characterized as a low - <br />permeability zone with very little groundwater yield. The lack of isolation from the overlying strata <br />within the Uinta Formation also poses little threat either hydrologically or with respect to water quality. <br />The Uinta hydrostratigraphic unit is regionally known to produce groundwater of good quality, and any <br />flow from the unit to overlying unsaturated strata would be limited by the relatively short duration of the <br />
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