Densities of formations in the North Sea

Details from exploration and appraisal wells on the UK continental shelf are normally re1 eased 5~ years after the completi on date by the UK Dept of Energy. A number of these released wells have been sampled for formation density values in order to investigate how the values vary spatially and with depth. These values are listed in full in Appendix 3. Generally, the wells selected were the earliest in each area, as these tended to be the deepest and with the longest density log runs. Those early wells also tend to be widely spaced. Within localised areas around hydrocarbon bearing structures, appraisal and development drilling has resulted in more closely spaced clusters of wells with large numbers of development wells being drilled from single platforms.