0 引言
1 地质背景
2 样品采集与实验方法
2.1 样品采集
2.2 实验
3 结果
3.1 有机质丰度
3.2 矿物组成
表1 Y101H3-8井岩心样品矿物成分含量测试结果Table 1 Test results of mineral composition content of core samples of Well Y101H3-8 |
样品编号 | 主要矿物/% | 黏土矿物/% | |||||||
---|---|---|---|---|---|---|---|---|---|
石英 | 长石 | 碳酸盐矿物 | 黄铁矿 | 黏土 | 伊利石 | 伊/蒙混层 | 高岭石 | 绿泥石 | |
Y-1 | 30 | 7 | 0 | 0 | 63 | 65 | 0 | 21 | 14 |
Y-2 | 38 | 8 | 0 | 3 | 51 | 67 | 0 | 18 | 15 |
Y-3 | 35 | 7 | 0 | 3 | 55 | 67 | 3 | 10 | 20 |
Y-4 | 39 | 7 | 0 | 3 | 51 | 66 | 3 | 20 | 11 |
Y-5 | 25 | 7 | 5 | 2 | 61 | 70 | 4 | 12 | 14 |
Y-6 | 22 | 6 | 27 | 2 | 43 | 60 | 4 | 27 | 9 |
Y-7 | 26 | 8 | 19 | 3 | 44 | 71 | 5 | 18 | 6 |
Y-8 | 32 | 6 | 13 | 4 | 45 | 68 | 6 | 15 | 11 |
Y-9 | 37 | 7 | 12 | 3 | 41 | 72 | 6 | 14 | 8 |
Y-10 | 43 | 4 | 7 | 5 | 41 | 71 | 6 | 15 | 8 |
Y-11 | 38 | 5 | 11 | 3 | 43 | 73 | 6 | 12 | 9 |
Y-12 | 38 | 6 | 10 | 3 | 43 | 77 | 5 | 12 | 6 |
Y-13 | 24 | 9 | 14 | 2 | 51 | 70 | 7 | 15 | 8 |
Y-14 | 42 | 5 | 10 | 2 | 41 | 72 | 4 | 14 | 10 |
Y-15 | 48 | 8 | 9 | 3 | 32 | 75 | 7 | 11 | 7 |
Y-16 | 62 | 5 | 13 | 4 | 16 | 77 | 8 | 11 | 4 |
Y-17 | 67 | 3 | 16 | 3 | 11 | 68 | 12 | 10 | 10 |
Y-18 | 56 | 4 | 18 | 5 | 17 | 89 | 3 | 8 | 0 |
Y-19 | 64 | 4 | 21 | 2 | 9 | 88 | 6 | 6 | 0 |
Y-20 | 67 | 5 | 7 | 4 | 17 | 75 | 3 | 15 | 7 |
Y-21 | 30 | 2 | 20 | 4 | 44 | 69 | 3 | 21 | 7 |
Y-22 | 24 | 6 | 18 | 1 | 51 | 74 | 5 | 17 | 4 |
3.3 孔隙度
4 讨论
4.1 储层矿物组成特征与成因
4.2 黏土矿物特征与演化规律
4.3 储层组成物质的孔隙贡献
图6 五峰组—龙马溪组页岩组成物质孔隙贡献Fig.6 Pore contribution of shale components in Wufeng-Longmaxi formations |
4.4 深层页岩气储层评价标准
图8 泸州区块五峰组—龙马溪组页岩储层参数相关图Fig.8 Correlation diagram of shale reservoir parameters of Wufeng-Longmaxi formations in Luzhou block |
表2 泸州区块深层页岩气储层分类评价标准Table 2 Classification and evaluation criteria for deep shale gas reservoirs in Luzhou block |
储层类别 | TOC/% | 孔隙度/% | 脆性矿物含量/% | 黏土矿物含量/% |
---|---|---|---|---|
Ⅰ类 | >3.0 | >3.5 | >50.0 | <42.0 |
Ⅱ类 | 2.0~3.0 | 2.8~3.5 | 36.0~50.0 | 42.0~54.0 |
Ⅲ类 | 1.0~2.0 | 2.2~2.8 | 18.0~36.0 | 54.0~67.0 |
Ⅳ类 | <1.0 | <2.2 | <18.0 | >67.0 |
4.5 勘探开发意义
表3 深层与中浅层页岩气储层有利层段特征对比[52-57]Table 3 Characteristics comparison of favorable strata between deep and middle-shallow shale gas reservoirs[52-57] |
区块 | 目标层 | 埋深/m | TOC/% | 孔隙度/% | 脆性矿物含量/% | 压力系数 | |
---|---|---|---|---|---|---|---|
中浅层 | 长宁 | 龙马溪组 | 1 285.0~3 174.5 | 2.70~3.25 | 2.0~7.6 | 30.0~69.0 | 1.3~2.0 |
威远 | 龙马溪组 | 1 440.0~1 560.0 | 0.51~8.12 | 3.8~8.0 | 40.0~78.0 | 1.4~2.0 | |
涪陵 | 龙马溪组 | 2 330.0~2 420.0 | 1.04~5.89 | 2.7~7.1 | 31.0~70.6 | 1.8~2.0 | |
深层 | 泸州 | 五峰组—龙马溪组 | 3 713.0~3 792.0 | 0.40~4.72 | 2.8~5.4 | 46.0~89.0 | >2.0 |