摘要
针对环开江—梁平海槽飞仙关组39口井的地层水进行了地化特征分析,研究认为:本区地层水矿化度高,含碱性,而且SO42-、H2S含量极高,以Na2SO4水型为主,各特征系数存在差异的地质特征;Na2SO4型地层水并不是都处于裸露和严重破坏的地质环境的地表水或浅层地下水,其成因是飞仙关组鲕滩储层顶(底)部的膏岩溶滤使地层水中SO42-含量偏高所致;这种高矿化度的Na2SO4型地层水,对油气运移、聚集与保存条件有利。
The study on the geochemical characteristics of formation water in 39 water-producing wells in Feixianguan Formation around Kaijiang-Liangping Trough indicates:(1) the alkaline formation water,with rich SO42-,H2S and high salinity,is mainly of Na2SO4 type,and there exist different geologic characteristics in various characteristic coefficients;(2) not all of Na2SO4-type formation water is exposed surface water or severely damaged shallow subsurface water just because gypsum lioxiviation at the top(bottom) of oolitic reservoirs in Feixianguan Formation makes SO42-content higher in formation water;and(3) Na2SO4-type formation water with high salinity is favourable for hydrocarbon migration,accumulation and conservation.
出处
《天然气勘探与开发》
2009年第1期5-7,17,共4页
Natural Gas Exploration and Development
关键词
四川盆地
环开江-梁平海槽
飞仙关组
地层水
地球化学特征
Sichuan Basin,around Kaijiang-Liangping Trough,Feixianguan Formation,formation water,geochemical characteristics
