地层水中微量有机质分析及应用——以川东、川东北区油气保存条件研究为例

ANALYSIS AND ITS APPLICATION OF TRACE ORGANIC MATTER IN FORMATION WATER——EXEMPLIFIED BY STUDY OF PRESERVATION CONDITION OF OIL-GAS IN EAST-NORTHEAST SICHUAN BASIN

该文简要介绍了地层水中微量有机质的富集、分析方法,并对川东区和川东北区8口钻井地层水及诺水河地表泉水中的有机质进行了富集分析,通过利用地层水中饱和烃系列、芳烃系列在不同水化学环境中的变化趋势,并结合前人地层水化学常规分析和氢、氧同位素等资料,探讨了两区的保存条件。研究表明,川东区建南气田海相层位为遭受过开启破坏的重建型封闭水化学环境;川东北海相层位为局部开启但整体仍属封闭的水化学环境。此外,通过统计对比,探索了判别封闭与开启水化学环境的地层水的有机地化指标。

The enrichment and analysis method of trace organic matter in formation water are briefly introduced in this article. Making use of the geochemical data of saturated and aromatic hydrocarbons from 9 water samples (including 8 drilling well formation water and 1 fountain water ), combined with the general analysis on formation water (abiochemistry and isotopes of δD\δ^(18)O), we discuss the different conservation condition in the two areas. Based on the research, we think the hydrogeological environment of marine stratum in the East Sichuan Basin has suffered from destruct but is closed at the end. While the Northeast Sichuan Basin is closed on the whole but open in partally. What's more, we seek after the geochemical parameter in formation water which can distinguish whether the hydrogeological environment is close or open.