沾化凹陷原油物性与油气成藏及开发的关系

Research on relationships between physical properties of crude oil and hydrocarbon
accumulation and reservoir development in Zhanhua Sag

周艳 庄鸿玉 杨贵丽 蔡东梅

中国石油大学地球资源与信息学院，山东 东营 257061 辽河油田公司欢喜岭采油厂，辽宁 盘锦 124010 胜利油田分公司地质科学研究院，山东 东营 257015

依据原油物理性质资料，沾化凹陷原油可分为超重油、重质油、中质油和轻质油四种类型，但以中质油为主。该地区断层发育，纵向上原油性质变化规律不明显，呈现“忽高忽低”的特点。平面上，原油性质受构造的控制，以生油洼陷为中心呈“环带状”分布。研究认为， 原油物性与油气成藏及开发具有良好的对应关系。运移方向上，随着运移距离的增加，原油物性不断变差。在相同的地质条件下，保存条件好，原油物性好，反之则差。油气开发过程中，原油物性总体上随开发时间的增长而变差，但由于开采方案的不同，变化趋势呈多样化。

Based on the data of physical property, the crude oil can be classified into extra-heavy oil,heavy oil,medium oil and light
oil in Zhanhua Sag. But the medium oil is the principal portion. The faults were well developed in this region and the physical
properties of crude oil has not apparent regular pattern, presenting suddenly high or suddenly low features in vertical. The crude oil
property is dominated by the structure and it distributes in the form of "ring shape"at the center of hydrocarbon generation sag. By
means of studying,the relationship between physical properties of crude oil, hydrocarbon accumulation and oilfield development is
homologous.Along the migratory direction, physical properties of crude oil were getting continuously poor with increasing of
migration distance.When the storage condition is well, physical properties of crude oil are well and contrarily, are poor. During the
development, the physical properies of crude oil are getting poor with the increasing of development time.The varying tendency is
variegated because of the difference of recovery scheme.