鄂尔多斯盆地西北部Y油区延长组致密储层特征研究

Research on the Characteristics of Dense Reservoir of Yanchang Formation in Y Oil Area of Northwest Ordos Basin

鄂尔多斯盆地西北部Y油区主要开采层位为长4+5和长8,研究区储集层不同开发层位的储层特征差异性比较大,属于致密储集层的范畴,油田开发难度大、储集层认识匮乏等.针对目前存在的问题,现开展Y油区不同层位的储集层特征方面的探讨,主要从岩石学、孔隙结构、储层物性、敏感性、润湿性、相渗特征等方面进行了详细分析与研究.结果表明,研究区长4+5油层储集层特征参数整体好于长8油层,油田开发遵守先肥后瘦的原则,优先开发长4+5油层,接替层位为长8储集层.

The main production horizons of Y oil area in Northwest Ordos Basin are Chang 4+5 and Chang 8.Reservoir characteristics of different development horizons in the study area are quite different.Reservoirs in the study area belong to the category of dense reservoirs.It is difficult to develop oilfields and lack of knowledge of reservoirs.In view of the existing problems,the reservoir characteristics of different layers in Y oil area are discussed,the petrology,pore structure,reservoir physical properties,sensitivity,wettability and permeability characteristics are analyzed and studied in detail.The results show that the reservoir characteristic parameters of Chang 4+5 reservoir in the study area are better than those of Chang 8 reservoir as a whole.Oilfield development abides by the principle of“fat first,thin later”and giving priority to the development of Chang 4+5 reservoir,and the replacement horizon is Chang 8 reservoir.