摘要
通过岩石热解评价仪(Rock-Eval)模拟试验对鄂尔多斯盆地南部地区延长组烃源岩样品进行了生烃动力学研究。结果表明,烃源岩裂解温度区间与样品的有机质类型有关。用平行一级模型求取了动力学参数,频率因子介于7.1×1014～1.6×1019s-1之间,活化能在190～300kJ/mol的范围内。将所求得的动力学参数外推到地质时期的升温速率下,长4+5油层组烃源岩转化率最高,为99.16%,累计生烃量为31.21mg/g;长6油层组烃源岩的转化率可达73.54%,累计生烃量为56.50mg/g;长7油层组4个油页岩的转化率较低,分别为53.17%、84.62%、28.13%和30.95%,但其累计生烃量较高,分别为36.19、73.54、22.18和29.67mg/g;长7油层组2个暗色泥岩的转化率分别为93.88%和85.08%,累计生烃量分别为13.29、10.41mg/g;长8油层组烃源岩的转化率为85.70%,累计生烃量为6.92mg/g;长9油层组烃源岩的转化率为27.87%,累计生烃量仅为0.85mg/g。
Hydrocarbon generation kinetics of source rock samples of Yanchang Formation in the southern Ordos Basin were researched by the Rock-Eval experiment.The pyrolysis temperatures of source rocks were influenced by their organic-matter types.A model of the same level was used to derive the kinetic parameters,the frequency factors of various source rocks were between 7.1×1014s-1~1.6×1019s-1 and activation energy was within 190~300kJ/mol.The transform rates and cumulative amounts of hydrocarbon generation were calculated by extrapolating kinetic parameters to the thermal history of source rocks.The transform rate of Chang 4+5 sample was 99.16%,its cumulative hydrocarbon generation amount(CHGA) was 31.21mg/g.The transform rate of Chang 6 sample was 73.54%,their cumulative amounts of hydrocarbon generation were 56.50mg/g.The transform rates of 4 shale samples of Chang 7 reservoir are 53.17%,84.62%,28.13% and 30.95% respectively,their cumulative amounts of hydrocarbon generation are 36.19,73.54,22.18 and 29.67mg/g respectively.The transform rates of 2 dark mudstone samples of Chang 7 reservoir are 93.88% and 85.08%,their cumulative amounts of hydrocarbon generation are 13.29 and 10.41mg/g.The transform rates of Chang 8 and Chang 9 are 85.70% and 27.87% respectively,their cumulative amounts of hydrocarbon generation are 6.92 and 0.85mg/g.
出处
《石油天然气学报》
CAS
CSCD
2013年第8期21-27,0+5,共7页
Journal of Oil and Gas Technology
关键词
鄂尔多斯盆地
三叠系延长组
烃源岩
生烃动力学
Ordos Basin
Triassic Yanchang Formation
source rocks
hydrocarbon generation kinetics
