石油与天然气地质 ›› 2023, Vol. 44 ›› Issue (4): 993-1008.doi: 10.11743/ogg20230415
刘昇1,2(), 范存辉1,2(), 张本健3, 张亚3, 王尉3, 罗冰4, 白晓亮3
收稿日期:
2023-03-08
修回日期:
2023-05-26
出版日期:
2023-08-01
发布日期:
2023-08-09
通讯作者:
范存辉
E-mail:lsengswpu@126.com;fanchswpi@163.com
第一作者简介:
刘昇(1998—),男,硕士研究生,油气地质。E-mail:基金项目:
Sheng LIU1,2(), Cunhui FAN1,2(), Benjian ZHANG3, Ya ZHANG3, Bing LUO3, Xiaoliang BAI4
Received:
2023-03-08
Revised:
2023-05-26
Online:
2023-08-01
Published:
2023-08-09
Contact:
Cunhui FAN
E-mail:lsengswpu@126.com;fanchswpi@163.com
摘要:
基于钻井岩-电特征和野外露头特征,结合区域沉积-构造格局,利用宏观及微观观察、主微量及稀土元素测试、总有机碳含量和镜质体反射率测定等手段对四川盆地东部中二叠统茅口组孤峰段展布特征、沉积环境和成藏条件进行研究。结果表明:①川东地区茅口组孤峰段的存在,证实茅口中、晚期受构造-沉积分异的影响,出现槽台格局。在茅口组二段B亚段沉积期(茅二B沉积期),川东地区孤峰段主要分布在盆地东北角。在茅口组二段A亚段沉积期(茅二A沉积期),孤峰段向南扩大到渠县—大竹—梁平,呈北西-南东向带状展布,厚度在0.8 ~ 26.6 m,川西北-川北则对应茅口组三段(茅三段)或茅口组四段(茅四段)。②孤峰段硅质页岩富含硅质放射虫,有机质含量高,具有典型的深水海槽相沉积特征。地球化学测试数据反映硅质页岩为深水缺氧还原环境且盐度较高,硅质来源以生物硅为主。③孤峰段烃源岩为一套富有机质的优质烃源岩,总有机碳含量整体较高、变化范围大,分布在1.69 % ~ 38.27 %,平均值为11.51 %,处于成熟-过成熟阶段。④川东地区孤峰段优质烃源岩可通过断裂与开江-梁平海槽礁滩相储层沟通,构成“下生上储”的源-储关系;此外,也可与茅口组优势滩相储层形成“旁生侧储”的成藏组合。川东地区孤峰段有望作为区域内优质烃源岩的接力勘探层系,对研究区内下一步油气勘探开发具有重要意义。
中图分类号:
表1
四川盆地东部红花园剖面、 DT002-4井和C67井茅口组—吴家坪组地球化学特征分析"
取样井/ 剖面 | 样品 编号 | 岩性 | 取样 层位 | 矿物含量/% | 微量元素含量/10-6 | δCe | Ceanom | δEu | Y/Ho | ||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Al2O3 | Fe2O3 | SiO2 | CaO | K2O | Rb | Sr | Ni | Cr | V | U | Mo | La | Ce | Pr | Nd | Sm | Eu | Gd | Y | Ho | |||||||||
红 花 园 剖 面 | HHY1 | 泥质灰岩 | 茅 二 段 | 5.068 | 0.793 | 36.770 | 24.496 | 0.281 | 9.632 | 2 932.46 | 215.35 | 367.12 | 83.76 | 8.52 | 6.28 | 12.57 | 8.00 | 1.83 | 7.04 | 1.32 | 0.27 | 1.36 | 13.38 | 0.27 | 0.35 | -0.48 | 0.88 | 49.75 | |
HHY2 | 泥质灰岩 | 5.609 | 1.501 | 41.644 | 22.231 | 0.511 | 11.169 | 1 044.62 | 452.28 | 350.67 | 78.49 | 19.12 | 12.46 | 16.83 | 12.44 | 2.69 | 10.56 | 1.90 | 0.39 | 2.06 | 18.39 | 0.39 | 0.39 | -0.43 | 0.87 | 47.50 | |||
HHY3 | 含泥灰岩 | 4.748 | 0.312 | 31.060 | 24.500 | 0.091 | 5.218 | 2 470.89 | 11.77 | 42.98 | 78.46 | 4.02 | 11.99 | 3.28 | 4.91 | 0.63 | 2.21 | 0.41 | 0.09 | 0.42 | 3.93 | 0.10 | 0.74 | -0.13 | 0.94 | 37.52 | |||
HHY4 | 含泥灰岩 | 2.581 | 0.780 | 6.189 | 23.861 | 0.446 | 8.815 | 557.83 | 72.83 | 85.11 | 378.42 | 7.76 | 29.98 | 9.65 | 12.72 | 1.37 | 4.89 | 0.89 | 0.19 | 0.91 | 7.69 | 0.19 | 0.73 | -0.16 | 0.91 | 40.88 | |||
HHY5 | 硅质页岩 | 孤 峰 段 | 1.514 | 2.827 | 92.728 | 0.215 | 0.382 | 20.950 | 280.08 | 155.27 | 669.31 | 1 190.54 | 18.94 | 359.32 | 34.66 | 38.28 | 4.82 | 17.04 | 21.17 | 0.62 | 2.97 | 16.04 | 0.53 | 0.62 | -0.23 | 0.75 | 30.53 | ||
HHY6 | 硅质页岩 | 1.795 | 2.784 | 92.543 | 0.236 | 0.346 | 20.485 | 275.45 | 148.73 | 468.20 | 1 052.35 | 20.45 | 336.27 | 35.88 | 37.47 | 4.76 | 16.58 | 17.63 | 0.55 | 2.86 | 15.86 | 0.48 | 0.60 | -0.25 | 0.87 | 33.04 | |||
HHY7 | 硅质页岩 | 1.913 | 1.809 | 91.444 | 0.234 | 0.500 | 18.050 | 258.92 | 100.46 | 351.10 | 1 020.90 | 14.66 | 352.40 | 45.71 | 49.17 | 5.90 | 17.84 | 7.93 | 0.48 | 2.37 | 8.64 | 0.28 | 0.62 | -0.23 | 1.04 | 30.72 | |||
HHY8 | 硅质页岩 | 1.894 | 2.054 | 91.634 | 0.224 | 0.480 | 18.875 | 251.32 | 105.64 | 389.50 | 1 064.59 | 17.66 | 326.24 | 43.46 | 51.33 | 5.82 | 18.52 | 30.88 | 0.46 | 2.24 | 8.25 | 0.23 | 0.67 | -0.19 | 0.72 | 35.87 | |||
DT002- 4井 | DT1 | 硅质页岩 | 吴家 坪组 | 19.664 | 8.748 | 47.763 | 2.233 | 2.087 | 36.901 | 524.87 | 69.17 | 111.22 | 180.37 | 2.86 | 1.32 | 119.29 | 234.20 | 30.66 | 111.20 | 13.70 | 3.07 | 14.85 | 48.29 | 1.85 | 0.84 | -0.05 | 0.92 | 26.10 | |
DT2 | 硅质页岩 | 21.602 | 6.755 | 48.786 | 1.619 | 2.264 | 40.532 | 549.31 | 60.44 | 114.80 | 197.07 | 4.50 | 0.88 | 109.09 | 216.27 | 27.69 | 99.29 | 3.22 | 3.15 | 14.17 | 80.25 | 2.94 | 0.86 | -0.04 | 0.88 | 27.26 | |||
DT3 | 硅质页岩 | 14.579 | 9.867 | 53.374 | 2.322 | 1.417 | 27.932 | 308.24 | 101.85 | 120.67 | 243.70 | 2.23 | 0.93 | 55.57 | 94.93 | 12.75 | 44.72 | 3.13 | 1.76 | 6.99 | 39.42 | 1.41 | 0.78 | -0.09 | 0.81 | 27.87 | |||
DT4 | 硅质页岩 | 孤 峰 段 | 27.147 | 3.063 | 60.536 | 0.223 | 2.292 | 43.308 | 711.12 | 20.59 | 27.81 | 76.03 | 7.27 | 4.36 | 178.90 | 404.18 | 50.67 | 217.78 | 2.71 | 3.88 | 16.99 | 63.75 | 2.15 | 0.92 | -0.03 | 0.83 | 29.70 | ||
DT5 | 硅质页岩 | 44.386 | 1.221 | 42.200 | 0.171 | 2.218 | 44.447 | 488.89 | 49.22 | 72.82 | 282.05 | 6.30 | 11.09 | 83.50 | 135.16 | 19.02 | 71.89 | 2.83 | 2.60 | 11.21 | 67.67 | 2.16 | 0.74 | -0.12 | 0.80 | 31.28 | |||
DT6 | 硅质页岩 | 1.652 | 1.642 | 91.873 | 0.397 | 0.260 | 20.749 | 126.34 | 480.45 | 623.79 | 3 275.61 | 21.48 | 273.58 | 32.75 | 40.87 | 5.46 | 19.54 | 3.22 | 0.58 | 2.18 | 15.33 | 0.45 | 0.65 | -0.20 | 0.95 | 34.07 | |||
DT7 | 硅质页岩 | 1.694 | 1.705 | 91.958 | 0.416 | 0.220 | 20.666 | 117.13 | 498.99 | 688.69 | 3 385.55 | 25.89 | 281.13 | 30.50 | 41.21 | 5.52 | 19.80 | 3.14 | 0.64 | 2.27 | 16.13 | 0.41 | 0.68 | -0.17 | 1.04 | 39.77 | |||
C67井 | C1 | 晶粒云岩 | 茅 二 段 | — | — | — | — | — | 0.03 | 84.29 | 527.13 | 9.97 | 5.69 | 0.69 | 0.27 | 1.25 | 0.42 | 0.19 | 0.69 | 0.15 | 0.23 | 0.17 | 2.68 | 0.05 | 0.18 | -0.76 | 6.25 | 56.97 | |
C2 | 晶粒云岩 | — | — | — | — | — | 0.03 | 60.52 | 7 741.50 | 3.19 | 1.16 | 0.49 | 0.18 | 0.14 | 0.11 | 0.03 | 0.13 | 0.03 | 0.01 | 0.04 | 0.45 | 0.01 | 0.39 | -0.43 | 1.05 | 51.17 | |||
C3 | 晶粒云岩 | — | — | — | — | — | 0.07 | 155.47 | 93.76 | 10.12 | 4.41 | 0.49 | 0.14 | 1.70 | 0.80 | 0.29 | 1.05 | 0.22 | 0.26 | 0.22 | 3.07 | 0.06 | 0.25 | -0.62 | 5.15 | 55.38 | |||
C4 | 晶粒云岩 | — | — | — | — | — | 0.44 | 1 995.57 | 114.49 | 39.93 | 5.54 | 0.31 | 0.34 | 2.85 | 1.31 | 0.32 | 1.11 | 0.32 | 3.76 | 0.37 | 2.61 | 0.04 | 0.28 | -0.60 | 47.66 | 66.45 |
表2
四川盆地东部红花园剖面和DT002-4井有机质丰度及成熟度特征(取样点位置见图8a)"
序号 | 取样点 | 层位 | 岩性 | TOC/% | Ro/% |
---|---|---|---|---|---|
1 | DT1 | 吴家坪组 | 硅质页岩 | 5.73 | 2.52 |
2 | DT2 | 吴家坪组 | 硅质页岩 | 5.86 | 2.64 |
3 | DT3 | 吴家坪组 | 硅质页岩 | 2.55 | 2.54 |
4 | DT4 | 孤峰段 | 硅质页岩 | 1.69 | 2.58 |
5 | DT5 | 孤峰段 | 硅质页岩 | 5.96 | 2.78 |
6 | DT6 | 孤峰段 | 硅质页岩 | 38.27 | 2.98 |
7 | DT7 | 孤峰段 | 硅质页岩 | 4.11 | 2.91 |
8 | HHY5 | 孤峰段 | 硅质页岩 | 7.05 | 2.53 |
9 | HHY7 | 孤峰段 | 硅质页岩 | 11.98 | 2.31 |
10 | HHY1 | 茅二A亚段 | 泥质灰岩 | 5.17 | 2.18 |
11 | HHY2 | 茅二A亚段 | 泥质灰岩 | 6.97 | 2.26 |
12 | HHY3 | 茅二A亚段 | 含泥灰岩 | 0.43 | 2.28 |
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