松辽盆地新站油田碎屑岩油层原油非均质性特征与成因分析

ANALYSIS ON THE HETEROGENEITY AND GENESIS OF CRUDE OIL IN THE CLASTIC ROCK RESERVOIRS OF XINZHAN OILFILED, THE SONGLIAO BASIN

张枝焕 王铁冠 常象春 李伯虎 周永炳 刘国志

ZHANG Zhihuan WANG Tieguan CHANG Xiangchun LI Bohu ZHOU Yongbing LIU Guozhi

石油大学, 地球科学系, 北京, 102200 2. 北京大学, 城市与环境学系, 北京, 100871 3. 西安石油学院, 西安, 710065 4. 中国石油, 大庆油田, 勘探开发研究院, 大庆, 163712

Geoscience Department, University of Petroleum, Beijing 102200, China 2. Urban and Environment Department, Beijing University, Beijing 100871, China 3. Xi'an Petroleum College, Xi'an, Shanxi 710065, China 4. Research Institute of Petroleum Exploration and Development, Daqing Oilfiled, Daqing, Heilongjiang 163712, China

国外许多实例研究表明,油藏内流体非均质性特征可作为判断油藏连通性的主要依据,但我国陆相含油气盆地碎屑岩储层物性非均质性强,导致油层内流体性质非均质性现象也更加复杂化、多样化。该文以松辽盆地新站油田为例,分析了油层内原油在族组成、饱和烃色谱指纹特征和生物标志物等方面存在的非均质性现象和分布特征,讨论了油源、油气运移、油层岩性、油藏内次生变化及油层连通性等地质/地球化学因素对造成油层内流体非均质性和油藏内原油组成混合作用的影响。研究表明,影响油层内流体非均质性的因素十分复杂,不能简单地根据油层流体非均质性判断油层的连通性,必须在原油族群划分对比、在对影响流体非均质性诸因素充分分析的基础上进行判断。

Some abroad cases showed that the analysis of fluid composition heterogeneity in reservoirs was an important tool to estimate reservoir connectivity. There is obvious heterogeneity of terrestrial clastic reservoirs in the petroleum-bearing basins of China, so that the variety of petroleum composition in reservoirs is more complication and diversification. This paper analyzed the heterogeneity and distribution features of group composition, saturated hydrocarbon components and biomarker composition in the crude oil of reservoirs in Xinzhan oilfield of the Songliao Basin. The geological and/or geochemical factors, such as petroleum sources, oil migration, reservoir rock lithology, geochemical changes of crude oil in reservoirs and reservoir connectivity, which affect heterogeneity and mixed actions of petroleum in reservoirs, had also been discussed. The results showed that the factors affecting fluid composition heterogeneity are very complex, and the reservoir connectivity can not been estimated easily only according to the fluid heterogeneity in reservoirs. It is important to divide oil populations and families and to study various factors affecting petroleum composition before to estimate reservoir connectivity.

https://doi.org/10.11781/sysydz200204354