<meta name="viewport" content="width=device-width, initial-scale=1.0">
Wytch Farm seismic section, unfaulted

1. Original interpretation

Note the unconformity (purple, top) and the correlation of the first horizon (Cornbrash, yellow). Across the main fault the first horizon of the left seems to continue in a strong uncoloured event on the right side.

2. Unfaulted without honouring the unconformity

The interval between the unconformity (purple, top) and the first horizon (Cornbrash; yellow) is heavily compressed on the right side of the main fault.

3. Unfaulted without honouring the unconformity

Strain display, colour scale 10% (light purple), 20% (dark purple).

3. Unfaulted honouring the unconformity

No strain.

Wytch Farm field, UK. The lower Cretaceous breakup unconformity at about one third from the top. Faulting is largely related to the breakup. The crossing faults in the middle are correctly handled. Data courtesy BP.

UK, Wytch Farm: faulting and unconformity related to the break-up of the Atlantic

Notes: excessive strain in case the unconformity is ‘missed’, see images below.