CHEMICAL CHARACIERISTICS OF FORMATION WATER SIGNIFICANT TO OIL RESERVOIR IN DONGYING FORMATION, NANPU SAG, BOHAI BAY BASIN
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摘要: 南堡凹陷是渤海湾盆地北部的富生烃凹陷,东营组是其重要油气勘探层位。通过对凹陷已有油气藏东营组地层水化学特征参数的统计分析,南堡凹陷地层水总体属于NaHCO3型,矿化度中等偏低,东营组一段和二段以及北堡油田的保存条件最好。利用地层水地化特征参数开展了断层封堵性示踪。结合区域盖层特征、断裂活动性和油气成藏特征分析,指出在区域性盖层发育区,主干断裂和浅层分支断裂发育带是浅层油气勘探的重要领域;而在东二段以下主干油源断裂带附近,应是中深层油气勘探的主要领域。Abstract: The Nanpu Sag is a hydrocarbon-rich sag in the north of Bohai Bay Basin.The Dongying Formation is an important oil and gas exploration target.Statistical analyses of chemical characteristics of the Dongying Formation water have indicated that the formation water in the sag belongs to NaHCO3 type with medium-low mineralization degree.Preservation conditions in member Ⅰ and Ⅱ of the Dongying Formation as well as in the Beipu Oil Field are the best.Fault sealing tracing has been done with parameters of chemical characteristics of formation water.Combined with analyses of characteristics of regional cap rock,fault activity and hydrocarbon accumulation,it is found out that in the regional cap rock generation area,main faults and shallow branch faults are the important targets for shallow oil and gas exploration.The region around the main faults below member 2 of the Dongying Formation is the main target for middle-deep oil and gas exploration.
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