Beatrice field is located in Block 11/30 in the UK sector North Sea. The field is only 14 miles (22.4 km) off the Scottish coast. Water depth is 160 feet (49 m). In August 1976, well 11/30-1, wildcats seventh in the sub-basin, discovered oil at about 6,000 feet (1,800 m) in an 831-ft (253 m) serious column, at a time when most business has canceled the interior of the Moray Firth as a petroleum province. The well produced a total of 6060 barrels per day with a low GOR. Crude oil, light sweet but has a high wax content (17%) and high freezing point (65 ° F, 18.3 ° C).
Another four wells, three production and a dry, have delineated the 4271 acres (1,728 ha.) In the field, in which there are an estimated 476 million barrels of oil in place (162 million barrels recoverable).
The reservoir area is a flood of marine Jurassic (Sinemurian-Callovian) of sandstone and shale sequence. Markers in the stratigraphic sequence may be related bordering the Moray Firth. The accumulation of oil in an elongated, anticlinal trap limited fault.
Hydrocarbons in the commercial area of the Moray Firth in the North Sea occur in reservoirs ranging in age from Upper Devonian, with the bulk of the reserves located in the Upper Jurassic and Lower Cretaceous clastic rocks. Most hydrocarbon discoveries in this area have been made in the outer Moray Firth, mainly in the graben floor Witch. A single oil field, Beatrice, was developed in the inner Moray Firth. The unusual location and chemical composition of Beatrice, compared with Piper and other North Sea oils generated from the Kimmeridge clay, have contributed to the longstanding dispute in the bud. Potential source of oil in the Inner Moray Firth has been recognized in Devonian lacustrine dolomitic siltstones, paralyze Middle Jurassic coals, the Upper Jurassic marine shales and other rocks. However, before this study, only the Upper Jurassic Kimmeridge Clay was recognized as an important source of effective rock in the main area of the Rift Valley in the North Sea. Biomarkers and analysis of stable carbon isotopes show conclusively that the Beatrice oil could not have been generated by the Kimmeridge Clay source rock classic, but is a mixture of products efficiently and Middle Devonian rocks of Jurassic origin. This work demonstrates the power of multiparametric geochemical approach to solve this oil problem hard rock of the correlation of origin. Using this approach may lead to recognition of the exploration of new works in previously well-explored basins.
The Beatrice field is one of the world's largest oil producing regions. The geological history of the oil province was dominated by an episode of Jurassic to the early extension of the crust of the Cretaceous, which developed the Viking Graben, Moray Firth and Central Rift Graben systems. Syn-rift, organic-rich marine shales (Kimmeridge Clay Formation) are the foundation stones for virtually all hydrocarbons in the region. Post-rift thermal subsidence allowed these source rocks to become partners for ...