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An exploration well has been drilled in a new lease to test the possibility of a subsurface geophysical high below a Precambrian through Devonian sequence that has been thrust over a Paleozoic shelf sequence. The well penetrated 245 feet of Pleistocene sedimentary fll before entering Upper Devonian sandstones. Regional geologic and geophysical data indicate that the entire allochthonous (out of place, or, "far traveled") sequence dips 45° to the west. Vertically drilled thicknesses of the various formations within the overthrust sequence are as follows (shallow to deep): Allochthonous Sequence WELL LOG Drilled Thickness (1t.) True Thickness (ft.) Fm. Upper Devonian clastic rocks Upper Cambrian sandstones Upper Cambrian shales Middle-Upper Cambrian shale Pre-Cambrian basement 470 112 600 600 320 Geophysical data also indicate that the underlying autochthonous (in place) Paleozoic shelf sequence is sub- horizontal with dips ranging from 1-6° to the west. Preserved cores from the well indicate that this sequence includes (shallow to deep): Autochthonous Sequence WELL LOG Fm. Drilled Thickness (t.) 1240 True Thickness (ft.) Permian Pennsylvanian Lower Mississippian 834 27 – bottom of well Calculate the true thicknesses of the allochthonous Precambrian to Devonian sequence and complete the table. In the space below, be sure to demonstrate how you made your calculations.

An exploration well has been drilled in a new lease to test the possibility of a subsurface geophysical high below a Precambrian through Devonian sequence that has been thrust over a Paleozoic shelf sequence. The well penetrated 245 feet of Pleistocene sedimentary fll before entering Upper Devonian sandstones. Regional geologic and geophysical data indicate that the entire allochthonous (out of place, or, "far traveled") sequence dips 45° to the west. Vertically drilled thicknesses of the various formations within the overthrust sequence are as follows (shallow to deep): Allochthonous Sequence WELL LOG Drilled Thickness (1t.) True Thickness (ft.) Fm. Upper Devonian clastic rocks Upper Cambrian sandstones Upper Cambrian shales Middle-Upper Cambrian shale Pre-Cambrian basement 470 112 600 600 320 Geophysical data also indicate that the underlying autochthonous (in place) Paleozoic shelf sequence is sub- horizontal with dips ranging from 1-6° to the west. Preserved cores from the well indicate that this sequence includes (shallow to deep): Autochthonous Sequence WELL LOG Fm. Drilled Thickness (t.) 1240 True Thickness (ft.) Permian Pennsylvanian Lower Mississippian 834 27 – bottom of well Calculate the true thicknesses of the allochthonous Precambrian to Devonian sequence and complete the table. In the space below, be sure to demonstrate how you made your calculations.

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
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An exploration well has been drilled in a new lease to test the possibility of a subsurface geophysical high below a Precambrian through Devonian sequence that has been thrust over a Paleozoic shelf sequence. The well penetrated 245 feet of Pleistocene sedimentary fill before entering Upper Devonian sandstones. Regional geologic and geophysical data indicate that the entire allochthonous (out of place, or, "far traveled") sequence dips 45° to the west. Vertically drilled thicknesses of the various formations within the overthrust sequence are as follows (shallow to deep): Allochthonous Sequence WELL LOG Fm. Drilled Thickness (ft.) 470 True Thickness (ft.) Upper Devonian clastic rocks Upper Cambrian sandstones Upper Cambrian shales Middle-Upper Cambrian shale Pre-Cambrian basement 112 600 600 320 Geophysical data also indicate that the underlying autochthonous (in place) Paleozoic shelf sequence is sub- horizontal with dips ranging from 1-6° to the west. Preserved cores from the well indicate that this sequence includes (shallow to deep): Autochthonous Sequence WELL LOG Fm. True Thickness (ft.) Drilled Thickness (ft.) 1240 Permian Pennsylvanian Lower Mississippian 834 27 - bottom of well Calculate the true thicknesses of the allochthonous Precambrian to Devonian sequence and complete the table. In the space below, be sure to demonstrate how you made your calculations. WORK SPACE:
Transcribed Image Text:An exploration well has been drilled in a new lease to test the possibility of a subsurface geophysical high below a Precambrian through Devonian sequence that has been thrust over a Paleozoic shelf sequence. The well penetrated 245 feet of Pleistocene sedimentary fill before entering Upper Devonian sandstones. Regional geologic and geophysical data indicate that the entire allochthonous (out of place, or, "far traveled") sequence dips 45° to the west. Vertically drilled thicknesses of the various formations within the overthrust sequence are as follows (shallow to deep): Allochthonous Sequence WELL LOG Fm. Drilled Thickness (ft.) 470 True Thickness (ft.) Upper Devonian clastic rocks Upper Cambrian sandstones Upper Cambrian shales Middle-Upper Cambrian shale Pre-Cambrian basement 112 600 600 320 Geophysical data also indicate that the underlying autochthonous (in place) Paleozoic shelf sequence is sub- horizontal with dips ranging from 1-6° to the west. Preserved cores from the well indicate that this sequence includes (shallow to deep): Autochthonous Sequence WELL LOG Fm. True Thickness (ft.) Drilled Thickness (ft.) 1240 Permian Pennsylvanian Lower Mississippian 834 27 - bottom of well Calculate the true thicknesses of the allochthonous Precambrian to Devonian sequence and complete the table. In the space below, be sure to demonstrate how you made your calculations. WORK SPACE:
Expert Solution
Intorduction.

To determine the true thickness of subsurface rock formations, it is necessary to know their orientations. True thickness essentially refers to the orthogonal distance between the boundary layers of the formation.

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