Characteristics of formation water chemical fields and its petroleum significance of the Neogene in Dongying Sag， Shandong Province
Chen Zhonghong1 Wang Shunan2 Wang Li3 Zha Ming1
1 School of Geosciences，China University of Petroleum，Qingdao 266580，Shandong 2 College of Geosciences，China University of Petroleum（Beijing），Beijing 102249 3 Petroleum Developing Center in Shengli Oilfield，SINOPEC，Dongying 257061，Shandong
Abstract：On the basis of calculation and analysis of abundant testing data，the characteristics of formation water in the Neogene of Dongying Sag was investigated to show the response of formation water fields of the Neozoic shallow strata in the eastern China.The results showed the obvious differences of the characteristics of the sealing and stagnating formation water chemical field in the Members 3 and 4 of Paleogene Shahejie Formation of Dongying Sag.The Neogene including the Guantao and Minghuazhen Formations is dominated by NaHCO3 type of formation water with low total salinity(generally less than 5 g/L). According to the vertica1 characteristics of the formation water，three hydrological environments can be classified: Strongly opening formation water alternation belt(0～0.7km)，weak-opening formation water alternate blocking belt(0.7～1.1km)and relatively closing formation water alternate tardy belt(>1.1km).In every belt the total salinity，ions and ion composition ratio had different responses.Comparative to sea water the quantitative relationship between the enrichment of Ca(Caexcess)and the losses of Na(Nadeficient)of the Neogene in Dongying Sag(Caexcess≤0.2367Nadeficient-0.6261)shows the obvious characteristics of Na losses，and the enrichment of Ca(Caexcess)is far lower than the Basinal Fluid Line established by Davisson(1996).This response is obviously different to the Na enrichment in the formation water of the Members 3 and 4 of Paleogene Shahejie Formation closing hydrological-geological system in the same sag.The response of the Neozoic formation water field in Dongying Sag reflects weak evaporation and concentration effect of formation water and strong alternate activities with surface water.Affected by the response of formation water field，the distribution of the relative density of crude oil and natural gas in burial-depth profile has good consistency with vertical zonation of formation water.
Chen Zhonghong,Wang Shunan,Wang Li et al. Characteristics of formation water chemical fields and its petroleum significance of the Neogene in Dongying Sag， Shandong Province[J]. JOPC, 2012, 14(5): 685-694.
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