Editing Geological factors influencing gas production in the Tyne field (Block 44/18a), southern North Sea, and their impact on future infill well planning

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[[File:YGS_CHR_12_GEOL_TAB_01.jpg|thumbnail|Table 1 Comparison between the Lower Ketch and Transition Sequence in the Tyne area.]]
 
[[File:YGS_CHR_12_GEOL_TAB_01.jpg|thumbnail|Table 1 Comparison between the Lower Ketch and Transition Sequence in the Tyne area.]]
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== Geological factors influencing gas production in the Tyne field (Block 44/18a), southern North Sea and their impact on future infill well planning ==
 
== Geological factors influencing gas production in the Tyne field (Block 44/18a), southern North Sea and their impact on future infill well planning ==
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From: Pages 183–193 of ''Carboniferous hydrocarbon geology: the southern North Sea and surrounding onshore areas'', edited by J. D. Collinson, D. J. Evans, D. W. Holliday, N. S. Jones. Published as volume 7 in the Occasional Publications series of the Yorkshire Geological Society, © Yorkshire Geological Society 2005.
 
From: Pages 183–193 of ''Carboniferous hydrocarbon geology: the southern North Sea and surrounding onshore areas'', edited by J. D. Collinson, D. J. Evans, D. W. Holliday, N. S. Jones. Published as volume 7 in the Occasional Publications series of the Yorkshire Geological Society, © Yorkshire Geological Society 2005.
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== Summary ==
 
== Summary ==
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The Tyne field is subdivided into separate fault blocks. Two major sets of faults occur ([[:File:YGS_CHR_12_GEOL_FIG_05.jpg|Figure 5]]):* ''West-southwest–east-northeast faults. ''These faults are of late Carboniferous age. There is little or no displacement of the Permian unconformity surface ([[:File:YGS_CHR_12_GEOL_FIG_04.jpg|Figure 4]]).
 
The Tyne field is subdivided into separate fault blocks. Two major sets of faults occur ([[:File:YGS_CHR_12_GEOL_FIG_05.jpg|Figure 5]]):* ''West-southwest–east-northeast faults. ''These faults are of late Carboniferous age. There is little or no displacement of the Permian unconformity surface ([[:File:YGS_CHR_12_GEOL_FIG_04.jpg|Figure 4]]).
 
* ''North-northwest–south-southeast faults. ''These displace the Lower Permian succession. Fault movement occurred during the Mesozoic.
 
* ''North-northwest–south-southeast faults. ''These displace the Lower Permian succession. Fault movement occurred during the Mesozoic.
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Faults within the Tyne North and Northwest blocks dip northwards. The southern boundary of these blocks is marked by a major east–west trending fault complex of late Carboniferous age. The Tyne South and Tyne West fault blocks dip southwards away from this complex. They are separated by a northwest– southeast orientated graben of younger, Mesozoic age ([[:File:YGS_CHR_12_GEOL_FIG_01.jpg|Figure 1]]).
 
Faults within the Tyne North and Northwest blocks dip northwards. The southern boundary of these blocks is marked by a major east–west trending fault complex of late Carboniferous age. The Tyne South and Tyne West fault blocks dip southwards away from this complex. They are separated by a northwest– southeast orientated graben of younger, Mesozoic age ([[:File:YGS_CHR_12_GEOL_FIG_01.jpg|Figure 1]]).
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'''[[:File:YGS_CHR_12_GEOL_TAB_01.jpg|Table 1]] Comparison between the Lower Ketch and Transition Sequence in the Tyne area'''
 
'''[[:File:YGS_CHR_12_GEOL_TAB_01.jpg|Table 1]] Comparison between the Lower Ketch and Transition Sequence in the Tyne area'''
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{| class="wikitable"
 
{| class="wikitable"
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* general rise in the gas/water contact because of aquifer expansion
 
* general rise in the gas/water contact because of aquifer expansion
 
* water breakthrough behind casing.
 
* water breakthrough behind casing.
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Well T2 ([[:File:YGS_CHR_12_GEOL_FIG_10.jpg|Figure 10]]) has produced the most gas by far (>55bcf) and shows a pressure-decline curve typical of a well that is being blown down without pressure support ([[:File:YGS_CHR_12_GEOL_FIG_11.jpg|Figure 11]]). The ''p''/''Z ''(connected gas) at about 90bcf is also greatest for this well. The well is unique in the Tyne field for two reasons: first, the gas column extends through the entire Lower Ketch sequence and, secondly, there is no water leg in direct communication, as the underlying Coal Measures sequence contains a thick shale section. The Carboniferous sequence dips southeast at only 2° and the lowest perforated interval is approximately 1000ft up dip from the gas/water contact ([[:File:YGS_CHR_12_GEOL_FIG_12.jpg|Figure 12]]).
 
Well T2 ([[:File:YGS_CHR_12_GEOL_FIG_10.jpg|Figure 10]]) has produced the most gas by far (>55bcf) and shows a pressure-decline curve typical of a well that is being blown down without pressure support ([[:File:YGS_CHR_12_GEOL_FIG_11.jpg|Figure 11]]). The ''p''/''Z ''(connected gas) at about 90bcf is also greatest for this well. The well is unique in the Tyne field for two reasons: first, the gas column extends through the entire Lower Ketch sequence and, secondly, there is no water leg in direct communication, as the underlying Coal Measures sequence contains a thick shale section. The Carboniferous sequence dips southeast at only 2° and the lowest perforated interval is approximately 1000ft up dip from the gas/water contact ([[:File:YGS_CHR_12_GEOL_FIG_12.jpg|Figure 12]]).

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