摘要
Neogene formation water and its response to hydrocarbon distribution in Liuxi-Liubei Area, in which hydrocarbon was richest in Raoyang Sag of Jizhong Depression, were analyzed; distribution characteristics of salinity and hydrochemical type of Neogene formation water were discussed; the internal relationship between abnormal geochemistry characteristics of Neogene formation water and the migration and distribution of hydrocarbon in the area was revealed. The results showed that Neogene developed NaHCO3 type of formation water with low salinity in Liuxi-Liubei Area, the salinity of formation water increased gradually from west to east and from north to south, and the hydrochemical type developed from HC03--Cl --Na+ to C1- -HCO--Na+ ; the corresponding relationship between abnormal Neogene formation water and hydrocarbon distribution was fine under the condition of good oil source and fault; Neogene hydrocarbon was usually rich in the area with high salinity of formation water, abnormal hydrochemical type and source fault developed, and the Na2SO4 or MgC12 type of Neogene formation water with high salinity indicated the characteristics of migration and accumulation from lower to upper.