Oil & Gas Geology ›› 2023, Vol. 44 ›› Issue (6): 1515-1529.doi: 10.11743/ogg20230614
• Petroleum Geology • Previous Articles Next Articles
Ruikang BIAN1,2,3(), Chuanxiang SUN1,2,3, Haikuan NIE1,2,3(), Zhujiang LIU4, Wei DU1,2,3, Pei LI1,2,3, Ruyue WANG1,2,3
Received:
2023-04-06
Revised:
2023-09-05
Online:
2023-12-01
Published:
2023-12-20
Contact:
Haikuan NIE
E-mail:bianruikang@foxmail.com;niehk.syky@sinopec.com
CLC Number:
Ruikang BIAN, Chuanxiang SUN, Haikuan NIE, Zhujiang LIU, Wei DU, Pei LI, Ruyue WANG. Types, characteristics, and exploration targets of deep shale gas reservoirs in the Wufeng-Longmaxi formations, southeastern Sichuan Basin[J]. Oil & Gas Geology, 2023, 44(6): 1515-1529.
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Table 1
Indices of high-quality shale intervals in deep shale gas reservoirs in the Wufeng-Longmaxi formations, southeastern Sichuan Basin[18,25-29]"
地区 | 深度/m | WF2—LM4笔石带 厚度/m | ①—⑤号小层 | |||||
---|---|---|---|---|---|---|---|---|
厚度/m | 平均TOC/% | 平均孔隙度/% | 平均硅质含量/% | 平均总含气量/(m3/t) | 压力系数 | |||
丁山 | 3 500~4 500 | 7~10 | 30~36 | 3.3 | 4.8 | 49.1 | 5.9 | 1.6~2.0 |
东溪 | 4 200~4 500 | 9~17 | 30~35 | 3.6 | 6.1 | 51.2 | 4.9 | >1.8 |
焦石坝 | 2 150~3 500 | 20~25 | 33~41 | 3.6 | 5.4 | 58.4 | 5.9 | 1.3~1.5 |
Table 2
Characteristics and favorable exploration targets of deep shale gas reservoirs of various structural types in the southeastern Sichuan Basin"
构造类型 | 平面构造位置 | 剖面构造位置 | 深度/m | 地质与工程条件 | 有利目标 |
---|---|---|---|---|---|
盆缘背斜型 | 盆缘构造带 | 逆冲-断展褶皱带低部位 | 3 500~5 000 | 与中-浅层地区相连,保存条件好,地应力较高,地层倾角变化大,构造宽缓地区地应力和差异系数条件更好,更有利于压裂改造 | 阳春沟、新场西部、丁山、林滩场和桂花等 |
盆缘斜坡型 | 盆缘构造带 | 滑脱褶皱带高部位 | 3 500~6 000 | 部分地区与中-浅层相连,断洼发育地区保存条件更好,高部位向低部位含气性逐渐增高,地层倾角一般较大,地应力和差异系数较高 | 新场东部、东溪东部、良村北和永乐-古蔺等 |
盆内高陡型 | 川东弧形高陡构造带南端、川南泸州-赤水构造带东段 | 冲断褶皱带 | 4 000~5 000 | 整体埋深较大,横向延伸宽度小,地层倾角大,地应力及差异系数较高,单侧断裂+高陡斜坡类型保存条件和压裂改造条件更好 | 桃子荡、隆盛、石油沟、东溪西北部和铁厂沟等 |
盆内向斜型 | 盆内深埋区 | 滑脱褶皱带低部位 | 5 000~7 000 | 埋深大、地层平缓、保存条件好、资源规模大、地应力高、差异系数小、压裂改造难度大 | 盆内深埋区 |
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