摘要
雅诺斯盆地是哥伦比亚重要的含油气盆地之一,白垩系~第三系浅海-河流相砂岩为该盆地主要的油气产层,发育大量低幅度构造重油油藏,油层的产水规律预测为该类油藏的难点。分析了毛管压力的大小、油水密度差和油柱高度对构造油藏含油饱和度分布的控制作用。研究了实验室条件下压汞曲线和油藏条件下毛管压力曲线转换关系。在分析以储层品质指数（RQI）评价储层孔隙结构的基础上,结合岩心分析孔隙度、渗透率等宏观物性参数,排驱压力、中值压力等微观孔隙结构参数,以及常规测井曲线响应特征,确定白垩系~第三系砂岩的储层分类标准,建立不同类别储层的含油饱和度与油柱高度的关系。综合储层类别和油柱高度建立C区块白垩系~第三系低幅度构造油藏油层分类标准,对测井解释的油层进行分类。结合油田实际生产动态资料,确定了油层类别和隔层发育情况是影响低幅度重油油层产水规律的控制因素。通过油层分类和隔层评价,提高了测井解释对低幅度构造重油油层产水规律预测的准确性,利于优选投产层段、控制油井产水以及合理安排油田后续开发配套设施建设进度。
Llanos basin is one of the important oil and gas basin in Colombia,and Cretaceous and Tertiary shallow sea- fluvial sandstone is mainly oil and gas reservoir. It develops lots of heavy oil reservoir with low amplitude structure. The main characteristics are low amplitude structure,high physical quality,and short oil legwith active edge or bottom water. Water production regularity of such reservoir is difficult to predict. Taking the low amplitude structure heavy oil reservoir of C block in Llanos basin for example,it analyzes control factors of oil saturation: capillary pressure,density difference between oil and water,and height of oil leg. It studies transformation of mercury injection curve in core lab and capillary pressure curve in reservoir condition,as well as reservoir pore structure using reservoir quality index,which is from porosity and permeability. It determines reservoir classification standard by macroscopic parameters,microcosmic parameters,response of well logs,as well as RQI. Macroscopic parameters involve porosity, permeability and microcosmic parameters involve displacement pressure,median pressure here. It divides reservoir into three classes. On the basis of reservoir classification,it creates the relationship between oil saturation and height of oil column using porosity,permeability and oil saturation from core. It determines oil layer classification standard by reservoir classification and height of oil column,which divides oil layers from petrophysics interpretation into three classes. It analyzes water production characteristics and the influence factors of bottom water breakthrough with production history of oilfield,which are oil layer class and interlayer. Oil layer classification and interlayer evaluation can improve the accuracy of water production regularity predict of low amplitude structure heavy oil reservoir,which helps to optimize completion intervals,control water production and arrange facilities construction schedule reasonably.
出处
《新疆石油天然气》
CAS
2015年第4期17-21,1-2,共5页
Xinjiang Oil & Gas
关键词
低幅度构造
重油油藏
油层分类
毛管压力
油柱高度
Low amplitude structure
Heavy oil reservoir
Oil layer classification
Capillary pressure
Height of oil leg
