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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。
The Zhenyuan-Jingchuan area is adjacent to the sedimentary center of the Triassic lake basin in the Ordos Basin. The thick mudstone of the Yanchang Formation in the Upper Triassic reaches a thickness of 250m. Based on the previous data and the latest geochemical data, the article discusses the geochemical characteristics of source rocks and explores the prospect of oil and gas exploration. According to the geochemical characteristics of source rock, the organic matter abundance and maturity of the Upper Triassic Yanchang Formation source rocks are higher, and the organic matter types are Type II1 ~ III, which are the main source rocks in this area. Hydrocarbon generation intensity, resource abundance and resource amount show that the Yanchang Formation source rock has the potential to form a medium-sized oil field.