Guidelines on geometrizing zones of saline sediments distribution within the East-Siberian hydrocarbon fields. A case of Chayanda oil-gas-condensate field
Complicated geological conditions of origination and multiple secondary transformations of the sediments at the productive horizons of Chayanda oil-gas-condensate eld necessitate studying expansion of the Vendian saline reservoirs. Considerable amount of core tests provided derivation of few general patterns for halite distribution in pores, but methodical issues dealing with geometrization of the halite-carrying zones according to well logs have never been examined in detail.The areal in- eld geometrization of the saline zones based on determination of the salt content according to well logs is more informative vs the net consideration of core data. The rst way provides total vertical account of salt content throughout the entire well column. With that in mind, using the lithologic and petrophysical tests of the halite-carrying rocks, the Gazprom VNIIGAZ LLC specialists newly for Chayanda eld have created a method for quantitative determination of halite content according to well logging data. The named procedure bases on correlation of the increment of the standardized neutron-gamma or neutron-neutron logs and the halite content according to core tests. In conformity with the calculated average salt content following the well logs, authors executed geometrization of the saline reservoirs, and in respect to the productive horizons of Chayanda eld compared production capabilities of the pioneer wells with the degree of reservoir salinity. Normalization of standard well logs has proved own ef cacy in case of Chayanda wells, and is a promising way to analyze geological-geophysical data about the Vendian hydrocarbon elds at Eastern Siberia.