塔河油田奥陶系油藏两期成藏原油充注比率测算方法

DETERMINATION OF DOUBLE FILLING RATIO OF MIXED CRUDE OILS IN THE ORDOVICIAN OIL RESERVOIR, TAHE OILFIELD

王铁冠 王春江 何发岐 王君奇 朱丹 王传刚 谢明亮

WANG Tie-guan WANG Chun-jiang HE Fa-qi WANG Jun-qi ZHU Dan WANG Chuan-gang XIE Ming-liang

石油大学, 教育部石油天然气成藏机理重点实验室, 北京, 102200 2. 中国石化股份公司, 勘探开发事业部, 北京, 100029 3. 中国石化股份公司, 西北分公司, 规划设计研究院, 乌鲁木齐, 830011 4. 中国石化, 勘探开发研究院, 北京, 100083

The key Laboratory of the Education Ministry, University of Petroleum, Beijing 102200, China 2. E & P Department, SINOPEC, Beijing 100029, China 3. Northwest Oilfield Company, SINOPEC, Urumqi 83001, China 4. Exploration and Production Research Institute, SINOPEC, Beijing 100083, China

针对石油从单个烃源层(或烃源灶)向一个油藏分前、后两期充注的成藏条件,本文以塔河油田奥陶系油藏为例,尝试采用代表每一期充注的两个端元原油样品,作模拟两期充注混合油的人工配比实验。借助于气相色谱工作站的分析数据处理软件,可以从混合油样的色谱图上实测出可分辨组分与未分辨的复杂混合物(UCM)的峰面积比值R/U,并建立混合油样配比率与其R/U值的相关曲线,作为两期成藏原油充注比率的测算图版。基于前期充注原油曾遭到强烈生物降解作用的事实,在实际采集的原油样品的全油气相色谱图上,同样可以测得R/U值,用以表征两期充注原油的烃类数量比率,然后再在原油充注比率测算图版上,将R/U值折算成该原油样品中前、后两期充注原油的数量的比率。

Be aimed at oil filling conditions in reservoir and taking the Ordovician reservoir in Tahe Oilfield as an example, the authors attempt to conduct an artificial partitioning experiment of mixed crude oils by double filling into the reservoir using individual filling oils as the end-member of artificial mixed oil samples. By mains of data processing soft-ware in the GC working station, the GC peak area ratios R/U between resolved components and unresolved complex mixture (UCM) can be measured on the gas chromatograms of all artificial mixed oil samples, the conversion diagram of double filling ratios of subsurface mixed crude oils were established based on the correlation curve between the partitioning ratios of artificial mixed oil samples and their R/U values. Owing to the heavy biodegradation only on the early filled oil, the R/U ratios can also be measured on the GC of subsurface crude oil samples, which can characterize the double filling ratios of hydrocarbons in the mixed crude oils, and then the double filling ratios of subsurface crude oils were obtained from above-mentioned conversion diagram and the R/U values.

https://doi.org/10.11781/sysydz200401074