The analysis shows that lea kage of crude oil and re-injection of waste water are the main causes of water s ystem pollution in oil and gas fields.

• 本文介绍双河、魏岗两油田地下水污染实例及其所造成水质恶化，饮用水源 受到污染被逐步废弃，水源变得更为紧缺等危害。