辽东湾坳陷油田水化学特征与油气运聚的关系  

Hydrochemical Properties of Oilfield Water and Its Relationship with Oil and Gas Migration and Accumulation in the Liaodong Bay Depression

作　　者：谭丽娟[1] 林鑫 

机构地区：[1]中国石油大学(华东)地球科学与技术学院,青岛266580

出　　处：《科学技术与工程》2015年第11期171-177,共7页Science Technology and Engineering

摘　　要：基于实际测试资料,统计分析了辽东湾坳陷油田水的水型、矿化度和化学系数的纵、横向变化特征;并探讨了油田水化学特征与油气运聚的关系。研究表明,研究区油田水以NaHCO3型为主;矿化度随埋深先增大后减小,垂向上分为三个带:近地表蒸发浓缩带、越流压滤浓缩带、泥岩压实排水淡化带;常规离子组成中Na++K+和Cl-占绝对优势。在地层压实排水离心流过程中,地层水明显受泥岩压实排水淡化作用的影响,矿化度较低;地层水在离心流运移过程中不断越流浓缩,矿化度逐渐增大,油气垂向上沿油源断层向上运移,在低凸起、断裂带、砂体等近地表蒸发浓缩带聚集成藏。Based on practical test data, the vertical and lateral characteristics of oilfield water type, salinity, saltionic constituent and chemical coefficient in the Liaodong bay depression and the relationship between hydrochemistry and oil and gas migration and accumulation were discussed. The study results show that the type of oilfield water in the area is predominantly NaHCO3 with its salinity increasing and then decreasing with burial-depth, from the shallow to the deep part is divided into three zones, near surface evaporative concentration zone;concentration zone by cross-formational flow;mudstone compaction and dehydration fresh zone. The general ions are high contents of Na ^ ＋ K ^＋ and Cl^ -. During the process of centrifugal flow, the formation water, affected by the desahing of compaction-released water, has low mineralization of formation water. However, the formation water concentrated and its mineralizaion increased gradually during the process of centrifuge over flow. The hydrocarbon migrates up along the fault of source rock vertically and accumulates in medium-shallow traps.

关 键 词：油田水 地层水化学 垂向分布 平面分布 油气运聚 辽东湾坳陷 

分 类 号：TE122.112[石油与天然气工程—油气勘探]