鄂尔多斯盆地镇—泾地区三叠系烃源岩地化特征及勘探前景

Geochetnical Features of Source Rock of Triassic and Prospects within Zhenyuan—ingchuan Area in Ordos Basin

镇原—泾川地区邻近鄂尔多斯盆地三叠纪湖盆沉积中心 ,上三叠统延长组暗色泥岩厚达 2 5 0m。文章利用前人资料和最新地化资料 ,论述了该区烃源岩地化特征 ,探讨了油气勘探前景。综合烃源岩地化特征认为 :上三叠统延长组烃源岩有机质丰度和成熟度较高 ,有机质类型为Ⅱ1～Ⅲ型 ,是本区主力烃源岩。生烃强度、资源丰度、资源量显示延长组烃源岩具有形成中型油田的潜力。

Zhenyuan - Jingchuan area is near the sedimentary center of the Triassic lake basin in Ordos basin and the dark mudstone in the Yanchang Formation in the Upper Triassic is up to 250m thick This paper discusses the ge-ochemical features and exploration prospect in this area based on the previous studies and new geochemical data. It is believed that the organic matter abundance and maturity of the source rock in the Yanchang Formation in the Upper Triassic are high, and the organic matters of Ⅱ 1-Ⅲtype are the major source rock in this area. The hydrocarbon-generating strength, resource abundance and extent show that the source rock in the Yanchang Formation has the potential to form a medium sized oilfield.