【摘要】 前期研究表明大陆深钻孔区超高压变质岩经历了多期变质作用,岩石的峰期变质温度达680-850℃,压力高达1 -3GPa,如此高温、高压,理论上已接近和超过传统意义上的石油死亡线,也就是说大陆深钻孔区超高压变质岩存在有机质的可能性比较小。然而,本课题通过排除大量钻井液、泥浆、添加剂以及样品分析等过程的污染,建立起特殊样品制备和检测方法,从大陆深钻孔区0-2000米超高压变质岩中检测到了微量可溶有机质和不可溶有机质。从而为大陆深钻孔区超高压变质岩中存在有机质提供了有力证据。本文还通过对可溶有机质、不可溶有机质的特征研究如生物标志物姥姣烷、植烷和干酪根、岩心样品的Rock-Eval热解分析和有机碳分析,以及与无机成因假说对比研究认为超高压变质岩中有机质的成因为有机成因。更多还原

【Abstract】 The previous research result means that ultrahigh-pressure metamorphic rock for the Chinese Continental Scientific Drilling(CCSD) had undergone multi stages of metamorphic process and peak stage metamorphic conditions of the Sulu orogenic belt have been estimated to be 680 - 850℃and 1 - 3GPa. So ultrahigh-temperature and ultrahigh-pressure conditions that pass over dead line of organic matter of classical theory. It means that organic matter from ultrahigh-pressure metamorphic rock for the CCSD exist impossible. But actually trace amount soluble organic matter and insoluble organic matter had been detected in ultrahigh-pressure metamorphic rock for the CCSD by special sampling preparation and sampling measure method after excluding pollutions from drilling mud and additive. It synchronously confirmed that organic matter in ultrahigh-pressure metamorphic rock for the CCSD really exists. This paper also has discussed organic geochemical character such as biomarks, kerogen and Rock-Eval pyrolysis analytic result of rocks and compared with abiogenic origin theories. The conclusion that genic origin of organic matter in ultrahigh-pressure metamorphic rock for the CCSD is biogenic origin be gained.更多还原