准噶尔盆地石炭系不同类型烃源岩生烃模拟研究

选取不同沉积环境发育的多种类型的烃源岩,通过烃源岩生烃热模拟实验,对比分析不同类型烃源岩的生烃产物、产率特征及生烃演化规律。结果表明,准噶尔盆地石炭系不同沉积环境发育的烃源岩产烃能力差异较大,最大烃产率从高到低依次为:弧间盆地泥岩、弧后盆地泻湖相泥岩、残留洋盆滨浅海相泥岩、沉凝灰岩。烃源岩的产烃率大小受控于其母质与埋藏热演化条件,有机质类型越好,产烃率相对越高;而受火山作用影响越剧烈,产烃率越低。下石炭统广泛发育的弧间、弧后盆地暗色泥质岩类烃源岩具备高产烃率,为有利烃源岩发育区,乌伦古坳陷和滴水泉地区为准噶尔盆地石炭系油气勘探的有利方向。

Simulation study of hydrocarbon generation for different Carboniferous source rocks in Junggar Basin

By selecting multiple types of source rocks distributed in different sedimentary facies and environ- ment for thermal simulation experiments，comparied the type of hydrocarbon products，yield characteristics，and the kinetic characteristics of hydrocarbon generation，it is discovered that the hydrocarbon production rate has sig- nificant difference from various types of source rocks under different geological conditions． The maximum hydrocarbon production rates from high to low are as follows，the mudstone in interarc basin，the lagoon mudstone in back- arc basin，the mudstone of shallow in remnant ocean basin，tuffaceous mudstone． The hydrocarbon production rates are controlled by the types of source rocks and the evolution of organic matters． The relatively higher hydrocarbon production rate is related to better type of organic matters and little influence of volcanic activity． It manifests that the mudstones in inter- arc and back- arc basin with higher hydrocarbon generation are favorable source rocks of Low- er Carboniferous，and the Wulungu Depression and Dishuiquan area are favorable exploration directions in Junggar Basin．