Oil & Gas Geology ›› 2021, Vol. 42 ›› Issue (1): 98-106, 123.doi: 10.11743/ogg20210109
• Petroleum Geology • Previous Articles Next Articles
Cheng Shen1,2(), Lan Ren2, Jinzhou Zhao2, Mingpei Chen3
Received:
2018-11-26
Online:
2021-02-28
Published:
2021-02-07
CLC Number:
Cheng Shen, Lan Ren, Jinzhou Zhao, Mingpei Chen. Division of shale lithofacies associations and their impact on fracture network formation in the Silurian Longmaxi Formation, Sichuan Basin[J]. Oil & Gas Geology, 2021, 42(1): 98-106, 123.
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Table 1
Division indexes for shale facies associations in the Longmaxi Formation, Sichuan Basin"
岩相组合与划分指标 | FA4 | FA3 | FA2 | FA1 |
层理缝指数/(条·mm·m-1) | < 40 | 40~60 | 40~80 | >80 |
裂缝充填程度 | 未充填、半充填 | 半充填 | 全充填 | 全充填 |
长英质矿物/% | < 50 | < 50 | >50 | >50 |
碳酸盐矿物/% | 0~75 | >20 | < 20 | < 20 |
孔隙度/% | 3~5 | < 3 | 3~5 | >5 |
TOC/% | < 3 | < 3 | 2~3 | >3 |
层理密度/(层·m-1) | < 60 | 60~120 | >120 | 60~120 |
Table 2
Shale facies associations and their rock mechanics parameters in the Longmaxi Formation, Sichuan Basin"
样品号 | 相组合 | 矿物含量/% | TOC/% | 泊松比 | 杨氏模量/GPa | 泊杨脆性指数 | ||
碳酸盐矿物 | 长英质矿物 | 粘土矿物 | ||||||
S-18 | FA1 | 6.8 | 53.0 | 37.4 | 3.54 | 0.168 | 35.19 | 0.653 |
S-50 | FA1 | 8.2 | 60.8 | 28.3 | 4.77 | 0.177 | 37.00 | 0.668 |
S-52 | FA1 | 8.4 | 61.4 | 27.6 | 4.23 | 0.179 | 38.11 | 0.689 |
S-15 | FA2 | 7.3 | 53.5 | 38.3 | 3.45 | 0.163 | 36.79 | 0.710 |
S-19 | FA2 | 7.5 | 51.8 | 37.4 | 3.42 | 0.166 | 38.30 | 0.738 |
S-31 | FA2 | 10.8 | 46.7 | 39.6 | 2.30 | 0.170 | 38.32 | 0.725 |
S-35 | FA2 | 10.8 | 51.8 | 34.5 | 3.95 | 0.169 | 39.40 | 0.755 |
S-41 | FA2 | 9.9 | 60.4 | 26.7 | 5.51 | 0.181 | 38.60 | 0.695 |
S-23 | FA3 | 23.6 | 39.5 | 29.8 | 4.03 | 0.167 | 34.91 | 0.649 |
S-33 | FA3 | 10.2 | 51.9 | 35.1 | 3.46 | 0.178 | 37.81 | 0.685 |
S-43 | FA3 | 34.5 | 45.7 | 18.6 | 2.94 | 0.180 | 37.37 | 0.668 |
S-45 | FA3 | 32.4 | 41.4 | 25.1 | 2.99 | 0.181 | 37.57 | 0.669 |
S-6 | FA4 | 6.3 | 46.5 | 40.6 | 2.67 | 0.166 | 34.83 | 0.651 |
S-8 | FA4 | 11.0 | 47.7 | 42.8 | 3.22 | 0.168 | 35.33 | 0.657 |
S-12 | FA4 | 7.5 | 46.2 | 43.5 | 3.01 | 0.171 | 35.94 | 0.662 |
S-20 | FA4 | 9.0 | 40.9 | 47.0 | 3.77 | 0.165 | 32.48 | 0.595 |
S-22 | FA4 | 11.0 | 45.5 | 40.7 | 3.09 | 0.164 | 34.26 | 0.643 |
Table 3
Diagnostic results of abnormal events in fracturing of Laterals H1, H2 and H3 of Pad Y"
单井 | 压裂段 | 页岩相组合 | 异常段分析 |
H1 | 2 | FA1 | 近井地带裂缝发育,滤失较大,扩展受限 |
10 | FA1 | 近井地带裂缝发育,滤失较大,扩展受限 | |
18 | FA1 | 滤失较大,缝宽受限,砂堵 | |
H2 | 3、5 | FA3 | 扩展受限,砂浓度提升受限,加砂困难 |
7 | FA2 | 压力陡升,扩展受限 | |
11 | FA1 | 压力陡升,砂敏感,扩展受限 | |
12 | FA1 | 扩展受限,砂浓度提升受限,加砂困难 | |
H3 | 1 | FA2 | 井筒污染严重 |
5 | FA3 | 天然缝网影响,动态缝宽不足,进砂通道受限 | |
9 | FA1 | 凝灰岩影响,砂堵,液体滤失量大,缝宽受限 | |
15 | FA3 | 砂堵,液体滤失量大,缝宽受限 |
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