0 引言
1 地质概况
2 源储基本成藏条件
2.1 烃源岩评价及展布
2.2 储层条件
表1 通南巴背斜与通江凹陷须二和须四段致密砂岩储层物性统计Table 1 Statistical table of physical properties of tight sandstone reservoirs in the second member and the fourth member of Xujiahe Formation in the Tongnanba Anticline and Tongjiang Depression, northeastern Sichuan Basin |
| 区块 | 层段 | 孔隙度/% | 渗透率/(10-3 μm2) | 样品 数量 | 数据来源井 | ||||
|---|---|---|---|---|---|---|---|---|---|
| 范围 | 均值 | 中位数 | 范围 | 均值 | 中位数 | ||||
| 通南巴背斜 | 须四段 | 0.7~3.18 | 1.3 | 1.06 | 0.003~0.348 6 | 0.028 | 0.01 | 25 | M102/M201 |
| 须二段 | 0.6~3.9 | 2.1 | 1.94 | 0.002 8~2.83 | 0.115 9 | 0.022 4 | 64 | M10/101/M201 | |
| 通江凹陷 | 须四段 | 0.1~6.04 | 1.50 | 1.40 | 0.000 7~0.852 | 0.044 7 | 0.018 2 | 274 | M3/M5/M8 |
| 须二段 | 0.1~6.37 | 3.03 | 3.1 | 0.007 8~1.216 3 | 0.101 5 | 0.030 2 | 55 | M4 | |
3 天然气成因及来源
3.1 天然气组分特征
表2 川东北须家河组天然气组分及碳同位素组成Table 2 List of natural gas composition of the Xujiahe Formation in the northeastern Sichuan Basin |
| 区域 | 井号 | 深度/m | 天然气组分/% | δ13C/‰ | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| CH4 | C2H6 | C3H8 | C4H10 | CO2 | N2 | C1 | C2 | C3 | |||
| 通南巴背斜 | HB104 | 3 628~3 658 | 98.1 | 0.5 | 0.1 | 0.0 | 0.5 | 0.8 | -30.5 | -32.2 | -29.5 |
| RH1 | 3 653~3 726 | 96.1 | 0.6 | 0.1 | 0.0 | 0.1 | 3.1 | -30.6 | -31.3 | / | |
| M2 | 3 161.8~3 266 | 99.1 | 0.5 | 0.0 | 0.0 | 0.3 | 0.0 | -30.2 | -32.2 | -30.01 | |
| M2 | 3 220~3 265 | 95.7 | 0.8 | 0.1 | 0.1 | 0.1 | 3.2 | -31.0 | -32.9 | -37.1 | |
| M4 | 4 304~4 324 | 98.5 | 0.7 | 0.1 | 0.0 | 0.6 | 0.2 | -30.8 | -34.8 | / | |
| M10 | 3 920~3 942 | 98.5 | 0.7 | 0.1 | 0.0 | 0.4 | 0.3 | / | / | / | |
| M101 | 3 229~3 246 | 98.2 | 0.8 | 0.1 | 0.4 | 0.4 | 0.2 | -31.1 | -34.6 | -33.0 | |
| M102 | 2 911~2 937 | 97.8 | 0.4 | 0.0 | 0.0 | 0.0 | 1.7 | -29.6 | -30.0 | / | |
| M103 | 2 904~2 922 | 98.6 | 0.8 | 0.1 | 0.0 | 0.3 | 0.3 | -28.6 | -34.7 | / | |
| MS1 | 3 358~3 468 | 93.3 | 0.7 | 0.2 | 0.0 | 0.2 | 5.7 | -33.7 | -35.1 | -34.0 | |
| 通江凹陷 | M3 | 4 900~4 914 | 99.0 | 0.4 | 0.0 | 0.0 | 0.5 | 0.0 | -30.9 | -28.9 | -29.5 |
| M3 | 5 057~5 079 | 89.4 | 0.3 | 0.0 | 0.0 | 5.1 | 5.2 | -31.4 | -31.3 | -31.6 | |
| M5 | 5 240~5 262.5 | 98.6 | 0.5 | 0.0 | 0.0 | 0.5 | 0.3 | -30.0 | -32.4 | / | |
| M5 | 5 099~5 117 | 97.2 | 0.3 | 0.0 | 0.0 | 0.2 | 2.3 | -31.6 | -30.9 | / | |
| M6 | 5 393.5~5 423 | 97.5 | 0.4 | 0.0 | 0.0 | 0.8 | 1.4 | -33.1 | -28.3 | -29.8 | |
| 巴中 | YL17 | 4 535~4 564 | 98.1 | 1.0 | 0.1 | 0.0 | 0.5 | 0.2 | -30.5 | -26.9 | / |
| YL171 | 4 522~4 565; 4 590~4 600 | 97.3 | 0.9 | 0.1 | 0.0 | 0.6 | 1.2 | -33.3 | -28.0 | -28.8 | |
| YL172 | 5 037~5 093 | 77.5 | 0.4 | 0.0 | 0.0 | 16.3 | 5.7 | -28.9 | -24.9 | / | |
| YL173 | 4 544~4 605 | 96.9 | 1.8 | 0.2 | 0.0 | 0.4 | 0.6 | -30.8 | -23.3 | / | |
| YL176 | 4 723-4 757 | 97.8 | 1.8 | 0.2 | 0.0 | 0.3 | 0.0 | -31.0 | -25.4 | -24.1 | |
3.2 天然气碳同位素特征
图6 川东北通南巴—巴中地区须家河组天然气δ13C1—δ13C2—δ13C3有机成因烷烃气鉴别图(a)和δ13C2-δ13C1与δ13C3相关(b)[(a)据文献[23],(b)据文献[8]]Fig.6 The organic hydrocarbon gas differentiation diagram of δ13C1, δ13C2 and δ13C3 (a),the correlation between δ13C2-δ13C1 and δ13C3 (b) for gas samples from structures in Xujiahe Formation of the Tongnanba-Bazhong area in the northeastern Sichuan Basin((a) is cited from Ref.[23].(b) is cited from ref.[8]) |
3.3 天然气来源分析
4 成藏过程分析
4.1 构造差异演化
表3 川东北通南巴背斜—通江凹陷典型井分层数据对比Table 3 List of typical single well stratigraphic data in the Tongnanba Anticline and Tongjiang Depression, northeastern Sichuan Basin |
| 层位 | M102井 | M201井 | M4井 | M3井 | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 顶深/m | 厚度/m | 顶深/m | 厚度/m | 顶深/m | 厚度/m | 顶深/m | 厚度/m | ||||
| K1 j | 0 | 510 | |||||||||
| J3 p | 0 | 36 | 0 | 434 | 0 | 1 523 | 510 | 1 660 | |||
| J3 s | 36 | 334 | 434 | 485 | 1 523 | 314 | 2 170 | 311 | |||
| J2 s | 370 | 1 531.5 | 919 | 1 460 | 1 837 | 1 516.3 | 2 481 | 1 448 | |||
| J2 q | 1 901.5 | 441.5 | 2 379 | 425.5 | 3 353.3 | 297.2 | 3 929 | 461.5 | |||
| J1 z | 2 343 | 437 | 2 804.5 | 319 | 3 650.5 | 397.5 | 4 390.5 | 452 | |||
| T3 x 5 | 2 780 | 300 | 3 123.5 | 304 | 4 084 | 352 | 4 842.5 | 399 | |||
| T3 x 4 | 2 827 | 3 130 | 4 128.5 | 4 894 | |||||||
| T3 x 3 | 2 960 | 3 242 | 4 272.5 | 5 087.5 | |||||||
| T3 x 2 | 3 017 | 3 302.5 | 4 303.5 | 5 156 | |||||||
4.2 成藏期次与时间
图9 川东北通南巴背斜须家河组成藏事件Fig.9 Gas accumulation events diagram for Xujiahe Formation in the Tongnanba Anticline, northeastern Sichuan Basin |

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