鄂尔多斯盆地延长组长7段与威利斯顿盆地Bakken组致密油形成条件的对比及其意义

自北美Bakken组致密油成功开发以后，致密油资源已成为各国非常规油气资源勘探开发的热点领域，我国在鄂尔多斯盆地延长组致密油的勘探开发中取得了一定的突破。从地质背景、岩性特征、生油岩特征、储集条件等方面，将威利斯顿盆地Bakken组与鄂尔多斯盆地延长组长7段致密油的成藏机理和富集规律进行系统对比。对比结果显示两者在构造背景、源储配置关系、生油岩特征、储集层特征等方面相似，不同之处在于延长组的泥页岩平均厚度大于Bakken组。鄂尔多斯盆地延长组长7段和威利斯顿盆地Bakken组致密油具有极其相似的成藏条件和富集规律，认为鄂尔多斯盆地延长组致密油具有较好的勘探前景。

Comparison of Chang 7 Member of Yanchang Formation in Ordos Basin with Bakken Formation in Williston Basin and Its Significance

Since the tight oil of Bakken Formation in north America developed successfully in industry，the tight oil has become a hot spot in the exploration and development of unconventional oil and gas resources，and the Chang 7 Member of Yanchang Formation in Ordos Basin has already got a great breakthrough to some extent in this hot area. Based on geological background，lithofacies features，oil-generating conditions and reservoir characteristics，this paper compared the mechanism of petroleum accumulation and the rule of enrichment of the tight oil in Bakken Formation with that in the Chang 7 Member of Yanchang Formation. The results show that the two formations are quite similar in geological background，disposition of source and reservoir rock，characteristics of source rock and reservoir. The only difference is that the average thickness of the shale in Yanchang Formation is thicker than that in the Bakken Formation. The comparison results indicate that the Yanchang Formation in Ordos Basin has a good exploration prospect.