The significance and variation characteristics of interlay water in smectite of hydrocarbon source rocks

作     者：CAI JinGong LU LongFei BAO YuJin FAN Fu XU JinLi 

作者机构：The State Key Laboratory of Marine GeologyTongii UniversityShanghai 200092China Wuxi Institute of Petroleum GeologySINOPEC Exploration and ResearchWuxi 214151China Geological Scientific Research InstituteShengli Oilfield CompanySinopecDongying 257000China 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：2012年第55卷第4期

页      面：397-404页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 070901[理学-矿物学、岩石学、矿床学] 081903[工学-安全技术及工程] 07[理学] 08[工学] 

基　　金：supported by National Natural Science Foundation of China(Grant Nos. 40672085 and 40872089) National Oil and Gas Special Fund(Grant No. 2008ZX05023-003) Science and Technology Office Fund of China Petroleum & Chemical Co. Ltd. (Grant No. P08039) Program of the State Key Laboratory of Oil-Gas of China Petroleum University,Beijing (Grant No. P08026) 

主　　题：source rocks organo-clay complexes interlayer water organic matter 

摘      要：To investigate variation characteristics of interlayer water bound up with organic matter in smectite, organo-clay complexes extracted from grinded source rock samples were determined using thermo-XRD, DTA and PY-GC. The dool diffraction peak of organo-clay complexes is postponed from 250 to 550℃ before reaching 1.00 nm and accompanied by exothermal peaks on DTA and organic matter with abundant C20-C30carbon detected by PY-GC, which is different from single smectite and indicates the existence of organic matter in the interlayer of smectite. Water desorption characteristics of organo-clay complexes are in consistent with smectite at 100 and 600℃, but different from smectite at 550℃ with an additional dehydration peak and a remaining d001 diffraction peak, suggesting the vcater removed at 550℃ is interlayer adsorption water rather than constituent water of clay minerals. Comparing the dehydration order and water loss, we conclude that part of interlayer water of smectite may act as the ＂bridge＂ that binds organic matter and smectite, which results in water-expelled lag beyond 250℃ and may provide a good medium for hydrocarbon migration and oil pool formation.