摘要
系统介绍了生物热催化过渡带气理论的提出、发展及研究现状。在沉积盆地中介于生物化学作用带与热解作用带之间、生物化学作用趋于结束、热解作用还未大规模成烃的特定层段,有机质在各种外生营力作用下形成的以甲烷为主的烃类气体即为生物热催化过渡带气,其相应深度为1500～2500m乃至3000m,δ13C1值为-60‰～-45‰,Ro值为0.3%～0.6%。从盆地构造背景、沉积成岩特征及过渡带有机质组成、早期演化、成烃过程、有机质在黏土矿物催化和构造运动引起的力化学作用下经脱基团和缩聚作用等化学反应的方面,综述了过渡带气成烃机制和成烃模式。阐述其地球化学特征,根据δ13C1与C1/(C1—C5)的关系,把过渡带气分为4类①低演化和运移的过渡带气;②典型过渡带气;③残留过渡带气;④生物改造或复合源过渡带气。确立了判识过渡带气的地质和地球化学标志,并分析了我国不同类型含油气盆地过渡带气的资源远景。
The proposition, development and research situation of the theory of bio-thermocatalytic transitional zone gases （BTTZG） are comprehensively introduced, suggesting that the gases are mainly composed of methane formed under the external agents at the specific stage between the end of biochemical processes and the onset of thermocatalysis. The corresponding burial depths range from 1500m to 2500m or even 3000m, the δ^13C1 values range from - 60‰- -45‰, and Ro values range from 0. 3% to 0. 6%. The evolution model and formation mechanism of bio-thermocatalytic transitional zone gases are summarized from several aspects such as tectonic setting of the basin, sedimentary and diagenetic characteristics, organic matter composition, early evolution, hydrocarbon generation process, de-grouping and condensation reaction under the control of mechanochemistry produced by extremely active structural stress and clay mineral catalysis. According to the relationship between δ^13 C1 and C1/（C1-C5 ）, BTTZG can be divided into 4 types： low- evolution and migration type; typical BTTZG; remained type; and the bio-reformed or multiple origin type. The geological and geochemical indicators are identified and the potential BTTZG resources of different kinds of oil bearing basins in China are prospected.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2005年第4期30-36,共7页
Petroleum Exploration and Development
基金
国家"973"项目(2001CB209102)
国家自然科学基金项目(49973010)
关键词
生物-热催化过渡带气
形成机制
地球化学特征
资源潜势
bio thermocatalytic transitional zone gasesformation mechanism
geochemical characteristics
resource potential
