陆相致密油藏差异化含油控制因素及分布模式

A Study on Differentiated Oil-Bearing Controlling Factors and Distribution Patterns of Continental Tight Oil Reservoir

陆相致密油藏含油性表现出分布散、范围宽、差异大的特点,通过对比分析烃源岩、储集层和源储配置3方面差异化含油控制因素,揭示了鄂尔多斯盆地长7致密油藏、准噶尔盆地芦草沟组致密油(页岩油)藏和松辽盆地扶余油层致密油藏差异化分布规律;综合应用孔渗测试、岩心观察、测井解释、动态分析等手段,明确了陆相致密油(页岩油)藏具有岩性控制物性、物性决定含油性的总体规律,优势微相和成岩相的叠合区一般是致密油富集区,并依此建立了中国典型致密油(页岩油)藏差异化含油分布模式,指导了井位部署和水平井轨迹设计,取得了明显实效。

The oil-bearing properties of continental tight oil reservoir are characterized by decentralized distribution, wide range and big differences. Based on the comparative analysis on controlling factors of oil-bearing properties of source rocks, reservoir and the relation between source rock and reservoir, the paper reveals the distribution rules of Chang 7 tight oil in Ordos basin, Lucaogou tight oil in Junggar basin and Fuyu tight oil in Songliao basin. Using porosity and permeability measurement, core observation, logging interpretation and dynamic analysis, the paper identifies the general law of continental tight/shale oil that reservoir physical property is controlled by lithology and the oil-bearing property is controlled by reservoir physical property. The overlapped areas of prevailing microfacies and diagenetic facies are generally the enrichment areas of tight oil, based on which differentiated distribution patterns are established for the typical tight/ shale oil in China. The study results can guide well deployment and horizontal well trajectory design and obvious effects have been gained.