Editing A sequence-stratigraphy scheme of the Late Carboniferous, southern North Sea, Anglo-Dutch sector

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Mapping suggests that distributary mouth-bar deposits have a lobate geometry and diameter of ''c. ''10–15 km. Thicker, Namurian shallow-water delta-front deposits may, however, be of greater lateral extent.
 
Mapping suggests that distributary mouth-bar deposits have a lobate geometry and diameter of ''c. ''10–15 km. Thicker, Namurian shallow-water delta-front deposits may, however, be of greater lateral extent.
  
====Wireline log characteristics====
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Wireline log characteristics
  
 
The gamma-log response of basal mudstones and siltstones is in the range 125–>150&nbsp;API and they have a sonic-log response of 90–100&nbsp;µsft<sup>–1</sup>. The gamma log response gradually decreases upwards to about 35–40&nbsp;API in clean distributary mouth-bar sandstones and to 60–70&nbsp;API in more argillaceous deposits. A corresponding upward decrease in δ''T ''values to an average of 80–90&nbsp;µsft<sup>–1</sup> is also observed. The gradational upward increase in gamma-log response from the basal mudstones–siltstones into sandstone and sharp upper inflexion are characteristic of distributary mouth-bar deposits.
 
The gamma-log response of basal mudstones and siltstones is in the range 125–>150&nbsp;API and they have a sonic-log response of 90–100&nbsp;µsft<sup>–1</sup>. The gamma log response gradually decreases upwards to about 35–40&nbsp;API in clean distributary mouth-bar sandstones and to 60–70&nbsp;API in more argillaceous deposits. A corresponding upward decrease in δ''T ''values to an average of 80–90&nbsp;µsft<sup>–1</sup> is also observed. The gradational upward increase in gamma-log response from the basal mudstones–siltstones into sandstone and sharp upper inflexion are characteristic of distributary mouth-bar deposits.

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