大港油田埕北断阶区地层水化学特征与油气成藏

doi:10.11743/ogg20090303

摘要/Abstract

摘要：

大港油田埕北断阶区古近-新近系地层水具有微咸水的特征,阳离子含量Na⁺+K⁺>Ca²⁺>Mg²⁺,阴离子含量Cl^->HCO₃^->SO₄^2->CO₃^2-,Cl^-在一定程度上控制着总离子量。地层水矿化度具有明显的垂向分带性,水型以高矿化度的NaHCO₃型为主,在研究区广泛分布。根据地层水矿化度与化学成分的纵向变化,可以划分为正向型、反向型及多向型水化学剖面;反向型和多向型剖面反映地层纵向连通性好,利于油气运移。根据矿化度、离子含量、钠氯系数、脱硫系数等参数的纵向分布,将水化学动力带分为地层水交替流畅带、交替阻滞带和交替迟缓带3类。交替迟缓带一般位于流体封存箱之下,地层水矿化度相对较高,是油气富集的区域。据此,预测张东、张东东地区的古近系沙河街组是油气勘探的有利目标区。

关键词: 油气运移, 油气聚集, 油气分布, 地层水化学, 大港油田

Abstract:

The groundwater in the Tertiary Chengbei fault terrace zone in the Dagang oilfield is considered to be mildly saline water.The contents of positive ions are characterized by Na⁺+K⁺>Ca²⁺>Mg²⁺,and the contents of negative ions feature in Cl^->HCO₃^->SO₄^2->CO₃^2-.The Cl^-controls the total ion content.The salinity of groundwater shows obvious vertical zonations.The high salinity NaHCO₃ water is the main type and distributes widely in the study area.According to the vertical change of salinity and chemical compositions of the groundwater,three types of hydrochemical profiles could be recognized,including positive type,reversed type and multi-directional type.The reversed and multi-directional type profiles reflect that the vertical connectivity is fine,ma-king it good for hydrocarbon migration.Based on the vertical distribution of parameters such as salinity,ion content,Na⁺-Cl^-ratio and coefficient of desulfurization,we have divided the hydrochemical dynamical zones into three types:the formation water exchange smooth zone,the exchange retardation zone and the exchange dilatoriness zone.Usually under the fluid compartment and with relatively high salinity,the exchange dilatoriness zone is considered rich in oil and gas.Therefore,we have predicted that the Shahejie Formations in the Zhangdong and eastern Zhangdong areas are favorable exploration targets.

Key words: hydrocarbon migration, hydrocarbon accumulation, hydrocarbon distribution, hydrochemistry, Dagang oilfield

中图分类号:

TE122.3

张宗峰,查明,高长海. 大港油田埕北断阶区地层水化学特征与油气成藏[J]. 石油与天然气地质, 2009, 30(3): 268-274. doi: 10.11743/ogg20090303 Zhang Zongfeng,Zha Ming,Gao Changhai. Hydrochemical characteristics and hydrocarbon accumulation in the Chengbei fault terrace zone of Dagang oilfield[J]. Oil & Gas Geology, 2009, 30(3): 268-274. doi: 10.11743/ogg20090303

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