About This Item
- Full TextFull Text(subscription required)
- Pay-Per-View PurchasePay-Per-View
Purchase Options Explain
Share This Item
Clay mineral transformations of 10 North Sea wells have been studied, and several transformation stages picked out and correlated with geothermal variations: smectite disappears at 149 to 167°F (65 to 75°C), whereas transformations in the mixed-layer illite-smectite clay minerals are observed between 113 and about 212°F (45 and about 100°C). At temperatures above 113 to 149°F (45 to 65°C), more than 30% illitic layers are found in the mixed-layered clay minerals, whereas temperatures from 140 to 167°F (60 to 75°C) indicate the transition zone toward more than 50% dehydrated lattice positions. Temperatures above 176 to 212°F (80 to 100°C) mark the lower limit for mixed-layer clay minerals containing more than 70% illitic la ers. The major part of the clay mineral transformations apparently takes place in the mesodiagenetic zone, in which most of the hydrocarbons are also formed.
Pay-Per-View Purchase Options
The article is available through a document delivery service. Explain these Purchase Options.
|Protected Document: $10|
|Internal PDF Document: $14|
|Open PDF Document: $24|
Members of AAPG receive access to the full AAPG Bulletin Archives as part of their membership. For more information, contact the AAPG Membership Department at [email protected].