辽河油田齐40块蒸汽驱二氧化碳成因分析  

Analysis of the Origin of Carbon Dioxide from Steam Flooding Exploitation in Block Qi-40 of Liaohe Oilfield

作　　者：闫红星[1] 杨俊印[1] 刘家林[1] 杨鹏成 姜文瑞 孙倩[1] YAN Hong-xing;YANG Jun-yin;LIU Jia-lin;YANG Peng-cheng;JIANG Wen-rui;SUN Qian(Research Institute of Oil Exploration and Development, Liaohe Oilfield of Petrochina, Panjin 124010, China)

机构地区：[1]中国石油辽河油田分公司勘探开发研究院,盘锦124010

出　　处：《科学技术与工程》2021年第22期9337-9342,共6页Science Technology and Engineering

基　　金：国家科技重大专项(2016ZX05055)。

摘　　要：渤海湾盆地辽河油田欢喜岭地区齐40块稠油油藏历经多年的蒸汽驱开发,其伴生气体中CO_(2)含量已上升至60%~90%。通过对该区块的油藏条件及开发前后的储层流体矿物分析,认为CO_(2)浓度的上升主要由于蒸汽驱开发导致油藏温度升高,储层流体和矿物发生化学反应结果,其中与CO_(2)形成有关的化学反应包括:稠油水裂解、硫酸盐热还原、矿物碳酸盐的分解与转化。室内模拟实验结果结合现场伴生气体的δ^(13)C_(CO_(2))值(+1.7‰~+6.6‰)证实了CO_(2)主要来源为碳酸盐岩的分解。After years of steam flooding exploitation,the CO_(2) content in the associated gas of heavy oil reservoir Block Qi-40 in the Huanxiling Area of Liaohe Oilfield in the Bohai Bay Basin has grown to 60%~90%.According to the analysis of the block's reservoir conditions and the minerals of reservoir fluid before and after exploitation,it is concluded that the higher CO_(2) content is mainly arisen from the chemical reactions of the reservoir fluid and its minerals,due to the rising reservoir temperature caused by the steam flooding exploitation.Those chemical reactions related to the higher CO_(2) content include the heavy oil aquathermolysis,thermochemical sulfate reduction(TSR),as well as the decomposition and conversion of mineral carbonate.Both the results of laboratory simulation experiments and the value of δ^(13)C_(CO_(2)) from+1.7‰to+6.6‰of the field associated gas confirm that the more CO_(2) mainly comes from the decomposition of carbonate rocks.

关 键 词：稠油 蒸汽驱 二氧化碳成因 稠油水裂解 硫酸盐热还原 碳酸盐分解 

分 类 号：TE357.7[石油与天然气工程—油气田开发工程]