石油与天然气地质 ›› 2022, Vol. 43 ›› Issue (5): 1249-1258.doi: 10.11743/ogg20220519
收稿日期:
2022-04-05
修回日期:
2022-07-19
出版日期:
2022-10-01
发布日期:
2022-09-02
第一作者简介:
张向涛(1969—),男,教授级高级工程师,油气地质勘探。E?mail: 基金项目:
Xiangtao Zhang(), Yuling Shi, Jie Liu, Huahua Wen, Xingye Yang
Received:
2022-04-05
Revised:
2022-07-19
Online:
2022-10-01
Published:
2022-09-02
摘要:
基于两种升温速率下的玻璃管封闭体系烃源岩生烃模拟实验,最大程度排除烃类裂解的影响,揭示了珠江口盆地惠西南地区古近系文昌组半深湖相优质烃源岩的生油与生气的绝对产率及其与成熟度的理论共变模式。通过生烃模拟实验提供的精确产率数据,首次建立了该区文昌组优质烃源岩生成重烃(C14+)及降解气(C1-5)的动力学模型参数。利用地质推演的手段重建了半深湖相烃源岩生成重烃-烃气转化率与地层温度的理论协变关系,结合生烃洼陷的埋藏史-热演化史,认为惠州26洼文昌组半深湖相优质烃源岩的生烃演化进程具有“早油晚气”的特点,早期石油快速生成,对应的地质年代跨度介于40~15 Ma,地温范围为95~160 ℃,而晚期主力烃源岩生成大量天然气,对应的地温范围为119~205 ℃,烃源岩现处于生气阶段的末期。
中图分类号:
表2
HZ26洼文昌组烃源岩生烃模拟实验升温方案"
升温速率/ (℃·min-1) | 实验温度/℃ | Ro/% | 重烃产率/ (mg·g-1) | 烃气产率/ (mg·g-1) | 升温速率/ (℃·min-1) | 实验温度/℃ | Ro/% | 重烃产率/ (mg·g-1) | 烃气产率/ (mg·g-1) |
---|---|---|---|---|---|---|---|---|---|
5 | 300 | 0.73 | 200.1 | 0 | 10 | 320 | 0.73 | 198.0 | 0 |
385 | 0.74 | 216.9 | 0.6 | 435 | 0.79 | 241.3 | 1.6 | ||
435 | 0.84 | 289.6 | 3.3 | 455 | 0.87 | 273.8 | 2.0 | ||
450 | 0.92 | 335.3 | 5.3 | 470 | 0.96 | 396.4 | 3.0 | ||
465 | 1.02 | 484.1 | 7.4 | 488 | 1.10 | 492.0 | 4.6 | ||
480 | 1.16 | 484.0 | 8.6 | 500 | 1.22 | 481.1 | 6.4 | ||
495 | 1.32 | 474.3 | 10.9 | 520 | 1.43 | 477.8 | 9.4 | ||
515 | 1.55 | 468.8 | 16.3 | 540 | 1.68 | 474.6 | 17.3 | ||
550 | 2.04 | 469.4 | 30.8 | 580 | 2.26 | 463.0 | 30.6 | ||
590 | 2.68 | 462.3 | 37.7 | 615 | 2.83 | 469.5 | 36.4 | ||
620 | 3.20 | 462.1 | 43.5 | 630 | 3.09 | 468.0 | 39.1 | ||
650 | 3.69 | 457.4 | 44.6 | 650 | 3.42 | 467.3 | 41.9 |
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