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《Geological Science and Technology Information》 2009-03
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Characteristics of Oilfield Water and Its Implications to Petroleum Geology in the Western Slope Belt,Dongpu Depression

MAN Hong-mei 1a,YE Jia-ren 1b,LI Ling-xi 2,3,XU Jun-jie 3,WANG Ji-li 4 (1a.Graduate School;1b.Key Loboratory of Tectonics and Petroleum Resources of Ministry of Education,China University of Geosciences,Wuhan 430074,China;2.Faculty of Energy,China University of Geosciences,Beijing 100083,China;3.Department of Exploration Management,Zhongyuan Oilfield Company,SINOPEC,Puyang Henan 457001,China;4.East China Sea Xihu Oil & Gas Operating Company,CNOOC,Shanghai 200030,China)  
As an important component of reservoir fluids,oilfield water is tied up with petroleum formation and distribution.Based on practical test data,this paper discusses the vertical and lateral characterstics of oilfield water type,salinity,salt-ionic constituent and chemical coefficient in the western slope belt of Dongpu Depression and its significance for petroleum accumulation and preservation.The study results show that the type of oilfield water in the area is prodominantly CaCl 2 with its salinity increasing with burial-depth,while the second step has the highest salinity.The general ions are composed of cations such as Na ++K +,Ca 2+,Mg 2+ and anions as Cl-,SO 2-4,HCO-3 accompanied with high contents of Na ++K + and Cl-;and cations alternation adsorption is found in the deep stratum.From the third step to the first step,the coefficients of Na/Cl,Na/Ca,desulfidation and carbonate balance decrease with burial-depth,whereas that of metamorphism and Ca/Mg increases.The characteristics of oilfield water distribution indicate that the deeper petroleum preservation is superior to that in the lower part,the depocenter is better than the slope belt.It is suggested that the second step should be the important area for petroleum accumulation and hydrocarbon exploration.
【Fund】: 国家自然科学基金项目(40172051)
【CateGory Index】: P618.13
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