摘要
采用数值模拟的手段,反演了新集地区所在坳陷的沉积史和热演化过程,并研究它们与煤层气的关系。由此得出:新集地区煤系上覆厚度应在2600m左右,但到白垩纪末已被剥蚀殆尽;中生代以来共发生了三次热事件(240～220Ma、160～120Ma、80～60Ma),其中240～220Ma和160～120Ma的热事件对本区煤化作用和煤生气影响最大,奠定了本区煤层气的生储格局;然而长达160Ma的盖层剥蚀导致了本区热成因煤层气的大量逸散。
Both the sedimentary history and the tectono-thermal development of the Huainan depression have been numerically mo deled by BasinMod software,and whic h relationship to coalbed methane has been discussed.The modelling results indicated that the thickness of the coal series covering strata in Xin-ji and its adjacent areas should be 2600m while been completely denudated till Cretaceous era,and that there occurred three tectono-thermal events since the Mesozoic in the area,corre sponding to 240-220Ma,160-120Ma an d 80-60Ma,respectively.The two events at a ge of 240-220Ma and of 160-120Ma,whi ch were contributed to coalification and co al gas generation,dominantly contr olled the basic pattern of coal-gas generation and reposition in Xin-ji and its adjacent areas.Additionally,the long-ter-med erosion of coal series covering s trata(up to 160Ma )induced the large emission of the thermo-genesis coal -gas in the area.
出处
《大地构造与成矿学》
EI
CAS
CSCD
北大核心
2001年第3期321-328,共8页
Geotectonica et Metallogenia
基金
本文系"九五"国家科技攻关项目子专题编号97-224-01-03-06
