顺北高温超高压缝洞型油藏原油相态性质测定及分析

顺北缝洞型油藏具有超深、高温、超高压特征，相同断裂带内和不同断裂上油藏在原油类型、性质方面表现出了差异，进行相态规律分析和特征掌握非常重要。文章中以1、5号断裂带上油藏为研究对象，对1、5号带井下样品进行相态实验测试，分析相态实验测试结果得到其相态变化规律。发现：随着储层深度减小，原油中重质组分（C7+）含量由5号带上最高的29.88 %降低至1号带上最低的18.72 %，但从两个断裂带内油藏采出的脱气油密度基本一致；油藏原油饱和压力及气油比，随着生产井段不断变深呈现线性减小趋势，而粘度呈现上升趋势；从顺北5号带往1号带方向，原油逐渐变轻，流体类型从弱挥发性油变为易挥发性原油，原油临界点向左移，相图宽度变窄、高度变高。从相态分析角度明确两个断裂带上油藏原油具有相同油源的特征。

Determining and analysis for phase behavior of crude oil from high-temperature ultra-high-pressure seam-hole type reservoirs in Shunbei

Shunbei seamhole-type reservoirs are characterized by ultra-deep, high temperature and ultra-high pressure, and the reservoirs within the same fracture zone and on different fractures show differences in crude oil types and properties. It is important to under its phase behavior characteristics. In this paper, the crude oil reservoirs on fracture zones 1 and 5 were set as the research objects, the phase state test was carried out on the No.1 and No.5 downhole samples, and the phase change law was analyzed by the phase state test results.and find that: with the decrease of reservoir depth, the content of heavy component (C7+) in the crude oil decreased from the highest 29.88% in the 5 fault zone to the lowest 18.72% in the 1 fault zone, but the density of degassed oil produced from these two fault zones was basically the same; The saturation pressure and gas-oil ratio of reservoir crude oil show a linear decreasing trend with the deepening of production well section, while the viscosity shows an upward trend; From Shunbei No. 5 belt to No. 1 belt, the crude oil gradually becomes lighter, the crude oil type changes from weak volatile oil to volatile oil. Meanwhile, the critical point of crude oil moves to the left, the width of phase diagram becomes narrower and the height becomes higher. From the perspective of phase behavior analysis, it is clear that the oil reservoirs in the 1 and 5 two fault zones have the same oil source characteristics.