0 引言
1 地质背景
2 姬塬地区长8储层基本特征
表2 姬塬地区长8储层胶结物平均含量Table 2 Cement content of Chang 8 reservoir in Jiyuan area |
层位 | 碳酸盐/% | 硅质 /% | 样品数 /个 | ||||
---|---|---|---|---|---|---|---|
矿物总量 | 铁方解石 | 铁白云石 | 方解石 | 白云石 | |||
长8 | 3.64 | 3.23 | 0.03 | 0.36 | 0.01 | 1.81 | 548 |
表3 姬塬地区长8储层黏土矿物平均含量Table 3 Clay mineral content of Chang 8 reservoir in Jiyuan area |
层位 | 绿泥石/% | 高岭石 /% | 伊利石 /% | 样品数 /个 | ||
---|---|---|---|---|---|---|
总量 | 绿泥石填隙物 | 绿泥石膜 | ||||
长8 | 3.09 | 2.98 | 0.11 | 2.14 | 1.63 | 548 |
3 多元逐步线性回归基本原理及应用
4 回归结果分析
4.1 数据来源及分析测试方法
表4 样品信息Table 4 Sample information |
样品 编号 | 井号 | 层位 | 顶界深度 /m | 样品 序号 | 井号 | 层位 | 顶界深度 /m |
---|---|---|---|---|---|---|---|
1 | C110 | 长8 | 2 606.61 | 11 | H43 | 长8 | 2 923.71 |
2 | C110 | 长8 | 2 612.38 | 12 | H80 | 长8 | 3 000.00 |
3 | F9 | 长8 | 2 465.41 | 13 | J1 | 长8 | 1 094.22 |
4 | F9 | 长8 | 2 512.92 | 14 | Y32 | 长8 | 2 519.34 |
5 | F9 | 长8 | 2 510.24 | 15 | Y32 | 长8 | 2 580.52 |
6 | H154 | 长8 | 2 811.95 | 16 | Y36 | 长8 | 2 658.70 |
7 | H167 | 长8 | 2 486.42 | 17 | Y50 | 长8 | 2 319.57 |
8 | H257 | 长8 | 2 786.98 | 18 | Y76 | 长8 | 2 491.99 |
9 | H39 | 长8 | 2 695.48 | 19 | Y83 | 长8 | 2 657.38 |
10 | H43 | 长8 | 2 904.16 |
4.2 单矿物含量与储层孔隙度相关关系
4.3 储层孔隙度与矿物含量多元逐步回归分析
表5 长8储层孔隙度与矿物含量多元逐步回归分析过程及结果Table 5 Process and results of multiple stepwise regression analysis between porosity and mineral content of Chang 8 reservoir |
回归 模型 | 回归方程 | R值|R检验值 | F值|F检验值 | t统计量|t统计检验量 | 标准 误差S |
---|---|---|---|---|---|
模型1 | y=18.387-0.021x 1%0.009x 2-0.084x 3-1.008x 4-0.195x 5+0.147x 6-0.666x 7-0.664x 8 | 0.630|0.444 | 1.478|2.510 | ( =-0.131; =-0.056; =-0.436; =-2.102; =-0.447; =0.432; =-1.024; =-1.902)|t 0.05,18=2.101 | 3.272 |
模型2 | y=17.844-0.019x 1-0.076x 3-1.009x 4-0.188x 5+0.153x 6-0.663x 7-0.658x 8 | 0.630|0.433 | 1.782|2.544 | ( =-0.125; =-0.614; =-2.163; =-0.463; =0.483; =-1.051; =-2.055)| t 0.05,19=2.093 | 3.185 |
模型3 | y=17.298-0.075x 3-1.005x 4-0.205x 5+0.156x 6-0.655x 7-0.664x 8 | 0.629|0.423 | 2.184|2.599 | ( =-0.623; =-2.215; =-0.548; =0.504; =-1.070; =-2.152)| t 0.05,20=2.086 | 3.106 |
模型4 | y=19.806-0.114x 3-1.132x 4-0.237x 5-0.755x 7-0.739x 8 | 0.623|0.413 | 2.665|2.685 | ( =-1.250; =-3.046; =-0.654; =-1.329; =-2.782)| t 0.05,21=2.080 | 3.054 |
模型5 | y=18.500-0.126x 3-1.017x 4-0.577x 7-0.674x 8 | 0.613|0.404 | 3.310|2.817 | ( =-1.433; =-3.144; =-1.173; =-2.770)| t 0.05,22=2.074 | 3.010 |
模型6 | y=17.416-0.158x 3-0.904x 4-0.691x 8 | 0.580|0.396 | 3.891|3.028 | ( =-1.872; =-2.904; =-2.820)| t 0.05,23=2.069 | 3.034 |
模型7 | y=11.710-0.480x 4-0.447x 8 | 0.485|0.388 | 3.697|3.403 | ( =-2.139; =-2.050)| t 0.05,24=2.064 | 3.189 |
模型8 | y=9.967-0.394x 4 | 0.319|0.381 | 2.829|4.242 | =-1.682| t 0.05,25=2.060 | 3.387 |
4.4 多元逐步回归模型的优选
4.5 多元回归方程模型的检验
图5 姬塬地区长8储层预测孔隙度与实测孔隙度模型偏差分析Fig.5 Deviation analysis between calculated porosity and measured porosity model of Chang 8 reservoir in Jiyuan area |
表6 长8储层孔隙度回归模型预测分析Table 6 Predictive analysis of the porosity regression model of Chang 8 reservoir |
样品编号 | 井号 | 层位 | 岩屑/% | 绿泥石/% | 硅质/% | 铁方解石/% | 实测孔隙度/% | 模型5预测孔隙度/% |
---|---|---|---|---|---|---|---|---|
A | H83 | 长8 | 27.4 | 0.2 | 1.0 | 1.8 | 15.50 | 13.26 |
B | H47 | 长8 | 33.6 | 0.1 | 3.4 | 2.4 | 8.10 | 10.69 |
C | L36 | 长8 | 34.2 | 0.5 | 2.0 | 1.0 | 10.56 | 11.85 |
D | CH91 | 长8 | 34.5 | 3.8 | 0.5 | 5.0 | 6.30 | 6.63 |
E | H89 | 长8 | 27.5 | 0.6 | 0.2 | 12.4 | 6.84 | 6.60 |
F | H177 | 长8 | 19.5 | 0.2 | 2.0 | 4.0 | 12.60 | 12.19 |
G | H117 | 长8 | 26.8 | 0.1 | 0.0 | 11.5 | 7.60 | 7.37 |
H | CH98 | 长8 | 27.2 | 4.3 | 5.5 | 0.8 | 7.69 | 6.99 |
I | L1 | 长8 | 20.5 | 0.0 | 2.5 | 1.0 | 11.80 | 13.80 |
J | G166 | 长8 | 33.0 | 3.9 | 1.5 | 0.5 | 8.79 | 9.17 |
K | H78 | 长8 | 16.0 | 0.3 | 2.0 | 1.0 | 12.40 | 14.35 |
L | H92 | 长8 | 13.5 | 0.0 | 0.0 | 14.5 | 8.51 | 7.03 |
M | F7 | 长8 | 28.0 | 6.3 | 1.3 | 1.7 | 6.19 | 6.67 |
N | L17 | 长8 | 32.8 | 0.2 | 8.0 | 1.3 | 8.09 | 8.67 |
O | G79 | 长8 | 18.0 | 0.0 | 0.6 | 14.5 | 5.27 | 6.11 |
P | G79 | 长8 | 22.0 | 0.4 | 0.3 | 14.0 | 6.99 | 5.71 |
Q | H219 | 长8 | 31.8 | 2.0 | 3.5 | 0.3 | 9.80 | 10.24 |
R | H90 | 长8 | 32.2 | 1.3 | 0.4 | 7.0 | 7.56 | 8.17 |
S | H117 | 长8 | 7.5 | 1.6 | 3.3 | 7.2 | 8.90 | 9.17 |
T | F10 | 长8 | 10.2 | 1.8 | 8.4 | 1.4 | 9.44 | 9.59 |
4.6 多元回归方程模型地质解释
图7 姬塬地区长8储层胶结物微观特征(a)B417井,2 273.62 m,长8,×200,单偏光,绿泥石向孔隙空间生长,以填隙形式存在;(b)Y28井,2 623.0 m,长8,×700,绿泥石填隙,扫描电镜;(c)Y67井,2 559.3 m,长8,颗粒表面绿泥石与自形绿泥石共生;(d)B417井,2 227.30 m,长8,×200,单偏光,孔隙中发育自形石英;(e)H83井,2 695.4 m,长8,×1 000,自生石英晶体,扫描电镜;(f)Y67井,2 562.44 m,长8,粒间孔充填自形石英晶体与粒表绿泥石,扫描电镜;(g)Y67井,2 487.9 m,长8,×50,单偏光,方解石胶结强烈;(h)H160井,2 673.36 m,长8,×200,单偏光,铁方解石胶结;(i)N168井,1 699.25 m,长8,×100,单偏光,方解石强烈胶结 Fig.7 microscopic characteristics of cement of Chang 8 reservoir in Jiyuan area |