矿物和水对干酪根热解生烃作用的影响——Ⅲ.甾、藿烷(烯)的形成与热演化  

The Effects of Minerals and Water on Hydrocarbon Generation from Kerogen: Ⅲ. Steranes and Triterpane Generation and Maturation

作　　者：潘长春[1] 耿安松[1] 钟宁宁[2] 刘金钟[1] 

机构地区：[1]中国科学院广州地球化学研究所有机地球化学国家重点实验室,510640 [2]石油大学资源与信息技术学院,北京102249

出　　处：《地质学报》2006年第3期446-453,共8页Acta Geologica Sinica

基　　金：国家"973"项目(编号G1999043307)资助的成果

摘　　要：金管-高压釜体系下干酪根热模拟实验结果表明,在不同含水量和不同矿物介质条件下,甾、藿烷(烯)的热演化特征具有明显差异。在纯干酪根、干酪根+水(TOC¨水=1¨1.5)和干酪根+高岭石+水(TOC¨矿物¨水=1¨24¨7~10)三种情形下,甾、藿烷(烯)热演化速率高于干酪根+蒙脱石、方解石或白云石+水(TOC¨矿物¨水=1¨24¨7~10)三种情形。对于前三种情形,藿烯类的热稳定性比17β(H)21β(H)-藿烷类低,对于后三种情形两类化合物的稳定性正好相反。C3122S/(22R+22S)升藿烷和C2920S/(20R+20S)和C29αββ/(ααα+αββ)甾烷比值都先从240℃至280℃降低,然后从280℃至320℃升高。表明这些化合物以不同的键合方式结合在干酪根上。The results of pyrolysis experiments, performed in confined system （gold capsule） demonstrate that maturation behaviors of hopanes （hopenes） and steranes released from kerogen change substantially with the variation of water amount and mineral nature. The maturation rates for hopanes （hopenes） and steranes are significantly higher in the three cases for kerogen alone, kerogen plus a small amount of deionized water （TO（] ＂water, 1＂1.5） and kerogen plus kaolinite and a large amount of deionized water （TOC＇kaolinite＇water, 1＂24 ＂7~ 10, pH 4. 99） than in the other three cases for kerogen plus montmorillonite, calcite and dolomite respectively and a large amount of deionized water （TO（] ~ mineral ＂water 1 ＂ 24 ＂ 7 ~ 10, pH 8.84 ~ 9.88）. Hopenes are less stable than 17^（H）21^（H） hopanes in the former three cases while it is exactly opposite in the latter three cases. All the three ratios of C3122S/（22R ＋ 22S） homohopanes, C2920S/（20R ＋ 20S） and Czgc~/ （~＋~[3[3） steranes generally decrease from 240＂C to 280＂C, and then, increase from 280~C to 320C for all six cases. This phenomenon indicates that the biological isomers of these compounds are attached to kerogen via different types of bonds with different activation energy, and therefore, released in different manner at the temperature range 240~320＇C with heating time.

关 键 词：矿物催化作用 藿烯 17β(H)21β(H)-藿烷 17α(H)21β(H)-藿烷 甾烷 

分 类 号：P618.130.2[天文地球—矿床学] P618.130.1[天文地球—地质学]