Experimental evidence for formation water promoting crude oil cracking to gas

作     者：SHUAI YanHua ZHANG ShuiChang LUO Pan LIU JinZhong HU GuoYi 

作者机构：State Key Laboratory of Enhanced Oil RecoveryResearch Institute of Petroleum Exploration&DevelopmentPetroChinaBeijing 100083China State Key Laboratory of Organic GeochemistryGuangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China 

出 版 物：《Chinese Science Bulletin》 (Chinese Science Bulletin)

年 卷 期：2012年第57卷第30期

页      面：4587-4593页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 

基　　金：supported by a PetroChina Exploration and Development Institute Innovation Fund(2007-A01) the National Natural Science Foundation of China(40773032) the National Oil and Gas Special Project(2011ZX05007-001) 

主　　题：原油裂解气 地层水 成气 实验证据 深层油气资源 非烃气体 深层油气勘探 勘探潜力 

摘      要：Crude oil cracking to gas is the key to determining the exploration potential and strategy for deep hydrocarbon *** the factors that affect the threshold and potential of crude oil cracking to gas as well as other possible influencing factors will provide the scientific basis for deep hydrocarbon exploration.A comparison of pyrolysis simulation experiments of crude oil,hydrous crude oil,and various water media under a constant temperature(350℃) and pressure(50 MPa) shows that water plays a large role in crude oil cracking to gas.(1) When water is added,the gas yields increase significantly,including those of alkane gases and non-hydrocarbon gases:the yield of alkane gases increases 1.8-3 times;the yields of H2 and CO2 also increase *** means that water takes part in the process of crude oil cracking to gas,and supplies ***,the presence of water will dramatically enhance the potential of crude oil cracking to gas.(2) Mg2+ ions in the formation water promote the crude oil + water reaction to some extent and increase the total yield of alkane gases and the yields of both H2 and CO2 ;more interestingly,the i-C4/n-C4 and i-C5/n-C5 ratios increase *** indicates that Mg2+ ions in formation water act as a catalyst,and a disproportionation reaction is involved in the crude oil + water *** study helps us to understand the factors influencing crude oil cracked gas and to evaluate the hydrocarbon resources in deep sedimentary basins.