准噶尔盆地红山油田红003井区下白垩统清水河组剩余油分布及其影响因素

Remaining Oil Distribution and Influencing Factors of the Lower Cretaceous Qingshuihe Formation in Hong 003 Well Area of Hongshan Oilfield, Junggar Basin

摘要: 准噶尔盆地红山油田红003井区下白垩统清水河组是该油田的主力油层，目前存在长期停关井多、剩余储量多、剩余油分布较分散等问题。首先基于铸体薄片、高压压汞等方法开展储层微观特征研究，然后利用油藏工程法、数值模拟法对剩余油纵横向分布特征进行定量研究，最后结合开发现状，分析总结影响剩余油分布的主要因素。研究表明，红山油田红003井区清水河组储层岩性以砂岩、砂砾岩为主，孔隙类型主要是剩余原生粒间孔，孔隙结构较好；近几年新投产区剩余油饱和度大于50%，主力产层K₁q₁³、K₁q₁⁴剩余油饱和度分别为46.9%、46.5%；平面上，剩余油主要分布在温度场低值区域，热连通较差区域剩余油饱和度较高；垂向上，热连通较差区域剩余油饱和度较高，剩余油主要位于储层中下部；影响剩余油分布的主要因素是储层质量、储层构型，注汽速度及井况等工程因素是可控因素，边水目前是局部影响因素。

Abstract: Qingshuihe Formation of Lower Cretaceous in Hong 003 well area of Hongshan Oilfield in the Junggar Basin is the main oil reservoir. At present, there are many problems such as long-term well shut in, too many remaining reserves, and scattered distribution of remaining oil. Firstly, based on methods such as casting thin sections and high-pressure mercury injection, the microscopic characteristics of reservoirs are studied. Then, quantitative research is conducted on the longitudinal and vertical distribution characteristics of remaining oil using reservoir engineering and numerical simulation methods. Finally, combined with the current development state, the main factors affecting the distribution of remaining oil are analyzed and summarized. Research has shown that the reservoir lithology of the Qingshuihe Formation in Hong 003 well area of the Hongshan Oilfield is mainly composed of sandstone and glutinite, and the pore type is mainly residual primary intergranular pores with good pore texture. In recent years, the remaining oil saturation in the new production areas exceeds 50%, and the remaining oil saturation in the main production layers K₁q₁³ and K₁q₁⁴ are 46.9% and 46.5%, respectively. Laterally, the remaining oil is mainly distributed in areas with low temperature fields, and the remaining oil saturation is higher in areas with poor thermal connectivity. Vertically, the remaining oil saturation is higher in the areas with poor thermal connectivity, and the remaining oil is mainly distributed in the middle to lower parts of the reservoir. The main factors affecting the remaining oil distribution are reservoir quality, reservoir architecture, engineering factors such as steam injection speed and well conditions are controllable factors, while bottom water is currently a local influencing factor.