鄂西渝东区建南气田地层水水化学特征及其意义

HYDROCHEMICAL CHARACTERISTICS OF FORMATION WATER AND THEIR SIGNIFICANCE IN JIANNAN GASFIELD,YUDONG AREA OF WEST HUBEI PROVINCE

对建南气田地层水常规组分、微量元素、δD、δ1 8O、δ3 4 S同位素测试成果的分析表明 ,该区水化学成分纵向变化不同于其它油田 ,并非正向型或反向型水化学剖面 ,彼此之间也不存在同源性 ,而是存在多套独立、封闭的水化学环境。a)香溪群 (T3 x)地层水有着良好的水化学封闭环境 ,地表水向下交替程度不大 ;b)嘉二段以下具有多套独立而封闭的水化学环境 ,其中飞三段 (T1 f3 )地层水在燕山晚期—喜山期通过断裂系统与黄龙组 (C2 h)

Analysis on the testing results of conventional components, trace elements and δD?δ 18 O and δ 34 S isotopes in the formation water of Jiannan gasfield showed that the longitudinal changes of hydrochemical components in this area were different from those in other oilfields. Several sets of independent and enclosed hydrochemical environments existed instead of positive or reverse typed hydrochemical sections. They were not congenetic. T 3 x formation water has good enclosed hydrochemical environments, and the alternation degree of surface water downward is not great. Below T 1 j 2, there are several independent and enclosed hydrochemical environments. Among them, hydrochemical alternation of T 1 f 2 formation water with C 2 h formation water happened in the Late Yanshanina Himalayan period by fault systems.