Oil & Gas Geology ›› 2025, Vol. 46 ›› Issue (5): 1367-1391.doi: 10.11743/ogg20250501
• Petroleum Geology • Previous Articles Next Articles
Jingzhou ZHAO1,2(
), Zhendong GAO3, Xuangang MENG3, Weitao WU1,2, Yubin BAI1,2, Lei CAO1,2, Zilong ZHAO1,2
Received:2025-08-01
Revised:2025-09-16
Online:2025-10-30
Published:2025-10-29
CLC Number:
Jingzhou ZHAO, Zhendong GAO, Xuangang MENG, Weitao WU, Yubin BAI, Lei CAO, Zilong ZHAO. Geological conditions for tight oil enrichment and its exploration potential of gravity-flow deposits from the 7th to 9th oil groups of the Triassic Yanchang Formation, Ordos Basin: Discussion on the petroleum exploration paradigms of downwarped lacustrine basins[J]. Oil & Gas Geology, 2025, 46(5): 1367-1391.
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Table 1
Statistics of the porosity and permeability of sandstone reservoirs in the Chang 7 oil group, Dingbian-Fuxian area, Ordos Basin"
| 地区 | 层位 | 孔隙度/% | 渗透率/(10-3 μm2) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 样品个数 | 最小值 | 最大值 | 平均值 | 中位值 | 样品个数 | 最小值 | 最大值 | 平均值 | 中位值 | ||
| 定边 | 长7 | 308 | 0.60 | 24.70 | 6.70 | 6.30 | 286 | 0.03 | 35.78 | 0.70 | 0.27 |
| 吴起 | 长7 | 377 | 0.70 | 17.80 | 7.00 | 6.80 | 336 | 0.02 | 49.39 | 0.80 | 0.25 |
| 志丹 | 长7 | 673 | 0.57 | 20.20 | 7.82 | 7.80 | 628 | 0.01 | 23.38 | 0.53 | 0.30 |
| 甘泉 | 长7 | 396 | 0.65 | 21.90 | 7.50 | 7.25 | 374 | 0.02 | 66.20 | 0.59 | 0.26 |
| 富县 | 长7 | 1 843 | 0.80 | 22.50 | 8.40 | 8.20 | 1 687 | 0.01 | 84.44 | 0.45 | 0.35 |
| 全区 | 长71 | 2 270 | 0.60 | 22.50 | 8.27 | 8.10 | 2 097 | 0.01 | 84.44 | 0.61 | 0.26 |
| 长72 | 990 | 0.57 | 24.73 | 7.50 | 7.20 | 906 | 0.01 | 66.20 | 0.49 | 0.26 | |
| 长73 | 337 | 0.70 | 20.20 | 6.70 | 6.60 | 308 | 0.02 | 24.75 | 0.49 | 0.22 | |
| 长7 | 3 597 | 0.57 | 24.73 | 7.90 | 7.80 | 3 311 | 0.01 | 84.44 | 0.57 | 0.26 | |
Table 2
Statistics of the porosity and permeability of sandstone reservoirs in the Chang 8 oil group, Dingbian-Fuxian area, Ordos Basin"
| 地区 | 孔隙度/% | 渗透率/(10-3 μm2) | 样品个数 | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 最小值 | 最大值 | 平均值 | 中位值 | 最小值 | 最大值 | 平均值 | 中位值 | ||
| 定边 | 2.0 | 13.5 | 6.5 | 6.2 | 0.04 | 9.43 | 0.44 | 0.27 | 372 |
| 吴起 | 0.5 | 12.8 | 6.4 | 6.5 | 0.01 | 2.24 | 0.22 | 0.14 | 104 |
| 志丹 | 0.9 | 16.9 | 7.8 | 8.4 | 0.02 | 21.90 | 0.45 | 0.27 | 765 |
| 甘泉 | 0.5 | 14.5 | 7.2 | 7.0 | 0.01 | 101.43 | 0.52 | 0.12 | 765 |
| 富县 | 0.7 | 22.7 | 8.0 | 8.0 | 0.01 | 3.28 | 0.29 | 0.21 | 700 |
Table 3
Statistics of the porosity and permeability of sandstone reservoirs in the Chang 9 oil group, Dingbian-Fuxian area, Ordos Basin"
| 地区 | 孔隙度/% | 渗透率/(10-3 μm2) | 样品个数 | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 最小值 | 最大值 | 平均值 | 中位值 | 最小值 | 最大值 | 平均值 | 中位值 | ||
| 定边 | 2.0 | 17.4 | 9.2 | 9.1 | 0.03 | 68.89 | 2.33 | 0.64 | 750 |
| 吴起 | 0.2 | 13.4 | 8.0 | 7.4 | 0.01 | 9.25 | 0.45 | 0.26 | 159 |
| 志丹 | 0.4 | 13.4 | 6.2 | 6.5 | 0.02 | 60.91 | 0.46 | 0.18 | 547 |
| 富县 | 0.8 | 14.6 | 5.5 | 4.9 | 0.01 | 1.63 | 0.15 | 0.11 | 150 |
Table 4
Comparison of reservoir properties and oil saturation of sandstone reservoirs of sandy debris-flow deposits and turbidity-current deposits in the Chang 7‒9 oil groups, Dingbian-Fuxian area, Ordos Basin"
| 参数 | 孔隙度/% | 渗透率/(10-3μm2) | 原始含油饱和度/% | |||
|---|---|---|---|---|---|---|
| 砂质碎屑流沉积 | 浊流沉积 | 砂质碎屑流沉积 | 浊流沉积 | 砂质碎屑流沉积 | 浊流沉积 | |
| 最大值 | 22.7 | 13.8 | 5.99 | 5.95 | 87.88 | 84.6 |
| 最小值 | 1.5 | 0.8 | 0.05 | 0.02 | 6.97 | 2.7 |
| 平均值 | 8.6 | 5.8 | 0.60 | 0.37 | 58.40 | 43.0 |
| 中位值 | 8.4 | 5.6 | 0.34 | 0.23 | 60.30 | 44.0 |
| 样品个数 | 404 | 304 | 404 | 304 | 311 | 216 |
Table 6
Source rock-reservoir-seal assemblage types of the Chang 7‒9 oil groups and their respective distributions in the lower oil play of the Yanchang Formation within the Dingbian-Fuxian area, Ordos Basin"
| 类 | 种 | 分布层位 |
|---|---|---|
| 源夹储型(A) | 源夹储厚层型(A1) | 长81、长82油层亚组 |
| 源夹储薄层型(A2) | 长73油层亚组 | |
| 源上储下型(B) | 源上储下直接型(B1) | 长81、长91油层亚组 |
| 源上储下近源型(B2) | 长8、长9油层组 | |
| 源上储下远源型(B3) | 长92油层亚组 | |
| 源下储上型(C) | 源下储上直接型(C1) | 长72、长82油层亚组 |
| 源下储上近源型(C2) | 长72油层亚组、长8油层组 | |
| 源下储上远源型(C3) | 长71油层亚组 | |
| 源-储侧接型(D) | 源-储同层侧接型(D1) | 长9—长7油层组 |
| 源上储下侧接型(D2) | 长92油层亚组、长10油层组 | |
| 源下储上侧接型(D3) | 长71油层亚组 |
Table 8
Production grades and corresponding EF thresholds of the Chang 8 oil group, Dingbian-Fuxian area, Ordos Basin"
| 地区 | 中产量/(m3/d) | 中产量富集指数/m | 高产量/(m3/d) | 高产量富集指数/m | 特高产量/(m3/d) | 特高产量富集指数/m |
|---|---|---|---|---|---|---|
| 定边 | 2.5 ~ 5.0 | 0.37 | 5.0 ~ 8.0 | 0.51 | > 8.0 | 0.61 |
| 吴起 | 2.5 ~ 5.0 | 0.41 | 5.0 ~ 8.0 | 0.56 | > 8.0 | 0.65 |
| 志丹 | 1.0 ~ 2.0 | 0.19 | 2.0 ~ 4.0 | 0.47 | > 4.0 | 0.75 |
| 甘泉 | 1.0 ~ 2.0 | 0.38 | 2.0 ~ 4.0 | 0.64 | > 4.0 | 0.89 |
| 富县 | 1.0 ~ 2.0 | 0.32 | 2.0 ~ 4.0 | 0.56 | > 4.0 | 0.79 |
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