Oil & Gas Geology ›› 2023, Vol. 44 ›› Issue (3): 778-788.doi: 10.11743/ogg20230319
• Petroleum Geology • Previous Articles Next Articles
Received:
2022-12-10
Revised:
2023-03-20
Online:
2023-06-01
Published:
2023-06-05
CLC Number:
Dongjun FENG. Sweet spot assessment and its significance for the marine-continental transitional shale gas of Permian Longtan Fm. in southeastern Sichuan Basin[J]. Oil & Gas Geology, 2023, 44(3): 778-788.
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Table 1
Measured vitrinite reflectance of samples from the Longtan Formation in Well S1, southeastern Sichuan Basin"
深度/m | 岩性 | Ro/% | 测点数/个 |
---|---|---|---|
3 095.98 | 黑色页岩 | 1.86 | 32 |
3 109.72 | 黑灰色页岩 | 1.93 | 23 |
3 114.20 | 黑色炭质页岩 | 1.99 | 40 |
3 130.21 | 煤层 | 2.08 | 29 |
3 143.55 | 灰黑色页岩 | 2.09 | 32 |
3 166.90 | 黑灰色泥岩 | 2.13 | 20 |
3 169.95 | 灰黑色炭质页岩 | 2.16 | 30 |
3 178.38 | 煤层 | 2.20 | 31 |
3 179.52 | 黑色炭质页岩 | 2.21 | 32 |
Table 2
Comparison of shale gas enrichment conditions in various facies zones in eastern and southeastern Sichuan Basin"
层系 | 井名 | 沉积亚相 | TOC/% | 干酪根类型 | Ro/% | 孔隙度/% | 孔隙类型 | 脆性矿物含量/% | 黏土矿物 含量/% |
---|---|---|---|---|---|---|---|---|---|
二叠系龙潭组 | S1 | 潮坪-潟湖 | 3.84 | Ⅲ-Ⅱ2 | 2.07 | 8.41 | 黏土矿物层间孔为主,可见有机质孔 | 44.80 | 55.20 |
五峰组-龙马溪组 | JY1 | 深水陆棚 | 3.52 | Ⅱ1 | 2.00~2.50 | 4.81 | 有机质孔为主,可见脆性矿物孔 | 62.40 | 34.60 |
侏罗系自流井组东岳庙段 | FY10 | 半深湖-深湖 | 1.37 | Ⅲ-Ⅱ2 | 1.56 | 4.15 | 黏土矿物层间孔为主,可见有机质孔 | 43.82 | 56.18 |
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