鄂尔多斯盆地致密油特征及开发技术难点

Characteristics and technical difficulties of tight oil development in Ordos Basin

致密油是继页岩气之后全球非常规油气勘探开发的又一新热点，为推动全球致密油开发和生产进程，降低成本，实现经济开发，需要开展致密油经济效益分析工作。研究对比鄂尔多斯盆地致密油现状、形成条件及地质特征，并通过孔隙演化进一步研究其致密成因，即机械压实作用使储层原生粒间孔隙大规模减少，胶结作用使储层进一步致密，强压实作用和胶结作用是储层致密的成因，异常强压实作用是引起致密油储层异常致密的最主要因素，为下步经济有效开发提供攻关方向。

Tight oil is another new hot spot of global unconventional hydrocarbon exploration and development after shale gas. To promote global development and production processes of tight oil, reduce costs and achieve economic development, it needs to conduct an economic benefit analysis of tight oil development. The causes of the tight oil forming are further researched through study and comparison of the status quo, the forming conditions, geological characteristics, and pores evolution of the tight oil in Ordos Basin. Mechanical compaction leads to the large-scale reduction of primary intergranuIar pores in the reservoirs. Cementation makes the reservoir further tight. Strong compaction and cementation are the causes of the tightness of the reservoirs. Abnormally strong compaction is the most important factor that causes the abnormal tightness of the oil reservoirs. Difficulties and research direction of the tight oil development are proposed so as to seek cost-effective development strategies.