摘要
对于较大规模的岩浆侵入区而言,岩浆的侵入对被侵入区的烃源岩生排烃的影响目前尚没有很好的分析方法。渤海湾盆地冀中坳陷文安斜坡古近纪时岩浆侵入石炭-二叠系煤系地层,对其烃源岩的热演化影响巨大。从盆地模拟的角度出发,将岩浆侵入视为附加热源,根据岩浆侵入的厚度及地温资料,给其赋予等效的大地热流值并代入热史程序中,得出源岩的生排烃结果。通过计算,文安斜坡古近纪时岩浆的侵入对石炭-二叠煤系源岩生烃的贡献率为62.4%.
For large-scale magma intrusion area, magma intrusion effects on hydrocarbon generating and expulsing of source rocks have not been recognized distinctly. In Jizhong depression of Bohai Bay basin, where the Wen'an slope encountered with magma intrusion that entered into the Carboniferous-Permian coal measure strata in Palaeogene, which has great effects on thermal evolution of the source rocks. As shown from the basin modeling, the magma intrusion could be regarded as additional geothermal source which can be put as an equivalent terrestrial heat flow value into the modeling in terms of the magma-intrusive depth and geothermal data, obtaining the hydrocarbon-generated and-expulsed results of the source rocks. The estimation shows that the contribution rate of the magma intrusion to hydrocarbon generation in Carboniferous-Permian source rocks is up to 62.4%.
出处
《新疆石油地质》
CAS
CSCD
2004年第6期614-616,共3页
Xinjiang Petroleum Geology
