天然气地球科学 ›› 2021, Vol. 32 ›› Issue (9): 1372–1383.doi: 10.11764/j.issn.1672-1926.2021.02.009

• 天然气地质学 • 上一篇    下一篇

多元逐步回归法在致密砂岩储层矿物与孔隙度关系分析中的应用

陈俊霖1,2(),王朋3,郜元元4,李开5,杨明5,张家强1,2,李家程1,2,李树同1()   

  1. 1.中国科学院西北生态环境资源研究院,甘肃 兰州 730000
    2.中国科学院大学,北京 100049
    3.中国石油长庆油田分公司第四采油厂,陕西 西安 718500
    4.中国石油长庆油田分公司第三采油厂,宁夏 银川 750006
    5.中国石油长庆油田分公司第五采油厂,陕西 西安 710100
  • 收稿日期:2020-12-22 修回日期:2021-03-05 出版日期:2021-09-10 发布日期:2021-09-14
  • 通讯作者: 李树同 E-mail:chenjunlin19@mails.ucas.ac.cn;lishutong1979@163.com
  • 作者简介:陈俊霖(1995-),男,甘肃会宁人,硕士研究生,主要从事沉积地质学研究.E-mail:chenjunlin19@mails.ucas.ac.cn.
  • 基金资助:
    国家自然科学基金面上项目“青海湖细粒沉积纹层特征与其沉积环境要素耦合关系研究”(41772142)

Application of multiple stepwise regression method in the analysis of the relationship between porosity and tight sandstone: Case study of Chang 8 reservoir in Jiyuan area, Ordos Basin

Junlin CHEN1,2(),Peng WANG3,Yuanyuan GAO4,Kai LI5,Ming YANG5,Jiaqiang ZHANG1,2,Jiacheng LI1,2,Shutong LI1()   

  1. 1.Northwest Institute of Eco?Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    2.University of Chinese Academy of Sciences,Beijing 100049,China
    3.No. 4 Oil Production Plant,PetroChina Changqing Oilfield Company,Jingbian 718500,China
    4.No. 3 Oil Production Plant,PetroChina Changqing Oilfield Company,Ningxian 750006,China
    5.No. 5 Oil Production Plant,PetroChina Changqing Oilfield Company,Xi'an 710100,China
  • Received:2020-12-22 Revised:2021-03-05 Online:2021-09-10 Published:2021-09-14
  • Contact: Shutong LI E-mail:chenjunlin19@mails.ucas.ac.cn;lishutong1979@163.com
  • Supported by:
    The National Natural Science Foundation of China(41772142)

摘要:

矿物类型及含量是影响储层致密的关键因素,为定量表征二者与储层孔隙度间的相关关系,以鄂尔多斯盆地姬塬地区长8致密储层为例,利用多元逐步回归分析方法建立了长8储层矿物含量与孔隙度之间的多元回归方程模型:y=18.500-0.126x3-1.017x4-0.577x7-0.674x8(孔隙度大小=18.500-0.126×岩屑含量-1.017×绿泥石含量-0.577×硅质胶结物含量-0.674×铁方解石含量)。通过该多元回归模型得到的预测孔隙度与实测孔隙度拟合性好,地质解释合理并与储层特征契合。综合认为,基于储层各矿物类型及含量的多元逐步回归法可以较为准确地预测储层孔隙度的大小,尤其在受多类型矿物影响的致密储层储集性能研究中存在一定的优越性。

关键词: 矿物类型及含量, 孔隙度模型, 多元逐步回归, 长8致密储层, 姬塬地区, 鄂尔多斯盆地

Abstract:

The type and content of minerals are the key factors affecting the reservoir density. In order to quantitatively characterize the correlation between them and reservoir porosity, taking Chang 8 tight reservoir in Jiyuan area of Ordos Basin as an example, the multiple regression equation model between mineral content and porosity of Chang 8 reservoir was established by multiple stepwise regression analysis:y=18.500-0.126x3-1.017x4-0.577x7-0.674x8 (porosity=18.500-0.126×cuttings-1.017×chlorite-0.577×siliceous cement -0.674×ferrocalcite). The calculated porosity obtained by the multiple regression model is well fitted with the measured porosity, and the geological interpretation is reasonable and consistent with the reservoir characteristics. It is concluded that the multiple stepwise regression method based on the types and contents of various minerals in the reservoir can accurately predict the size of reservoir porosity, especially in the study of tight reservoir performance affected by multiple types of minerals.

Key words: Mineral type and content, Porosity model, Multiple stepwise regression, Chang 8 tight reservoir, Jiyuan area, Ordos Basin

中图分类号: 

  • TE122.2

图1

鄂尔多斯盆地构造分区及研究区位置"

图2

研究区长8储层岩石类型"

表1

姬塬地区长8 储层岩石碎屑成分"

层位

石英

/%

长石

/%

岩屑/%

云母

/%

火成岩变质岩沉积岩
长829.916~5326.00~688.10~2612.7?2.5~26.43.4?0~184.5?0~15.7

表2

姬塬地区长8储层胶结物平均含量"

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83.643.230.030.360.011.81548

表3

姬塬地区长8储层黏土矿物平均含量"

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83.092.980.112.141.63548

表4

样品信息"

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

1C110长82 606.6111H43长82 923.71
2C110长82 612.3812H80长83 000.00
3F9长82 465.4113J1长81 094.22
4F9长82 512.9214Y32长82 519.34
5F9长82 510.2415Y32长82 580.52
6H154长82 811.9516Y36长82 658.70
7H167长82 486.4217Y50长82 319.57
8H257长82 786.9818Y76长82 491.99
9H39长82 695.4819Y83长82 657.38
10H43长82 904.16

图3

长8储层各矿物含量与孔隙度的相关关系分析"

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"

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1y=18.387-0.021x1%0.009x2-0.084x3-1.008x4-0.195x5+0.147x6-0.666x7-0.664x80.630|0.4441.478|2.510tx1=-0.131;tx2=-0.056;tx3=-0.436;tx4=-2.102;tx5=-0.447;tx6=0.432;tx7=-1.024;tx8=-1.902)|t0.05,18=2.1013.272
模型2y=17.844-0.019x1-0.076x3-1.009x4-0.188x5+0.153x6-0.663x7-0.658x80.630|0.4331.782|2.544tx1=-0.125;tx3=-0.614;tx4=-2.163;tx5=-0.463;tx6=0.483;tx7=-1.051;tx8=-2.055)| t0.05,19=2.0933.185
模型3y=17.298-0.075x3-1.005x4-0.205x5+0.156x6-0.655x7-0.664x80.629|0.4232.184|2.599tx3=-0.623;tx4=-2.215;tx5=-0.548;tx6=0.504;tx7=-1.070;tx8=-2.152)| t0.05,20=2.0863.106
模型4y=19.806-0.114x3-1.132x4-0.237x5-0.755x7-0.739x80.623|0.4132.665|2.685tx3=-1.250;tx4=-3.046;tx5=-0.654;tx7=-1.329;tx8=-2.782)| t0.05,21=2.0803.054
模型5y=18.500-0.126x3-1.017x4-0.577x7-0.674x80.613|0.4043.310|2.817tx3=-1.433;tx4=-3.144;tx7=-1.173;tx8=-2.770)| t0.05,22=2.0743.010
模型6y=17.416-0.158x3-0.904x4-0.691x80.580|0.3963.891|3.028tx3=-1.872;tx4=-2.904;tx8=-2.820)| t0.05,23=2.0693.034
模型7y=11.710-0.480x4-0.447x80.485|0.3883.697|3.403tx4=-2.139;tx8=-2.050)| t0.05,24=2.0643.189
模型8y=9.967-0.394x40.319|0.3812.829|4.242tx4=-1.682| t0.05,25=2.0603.387

图4

模型预测孔隙度与原始孔隙度相关性分析"

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"

表6

长8储层孔隙度回归模型预测分析"

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/%
AH83长827.40.21.01.815.5013.26
BH47长833.60.13.42.48.1010.69
CL36长834.20.52.01.010.5611.85
DCH91长834.53.80.55.06.306.63
EH89长827.50.60.212.46.846.60
FH177长819.50.22.04.012.6012.19
GH117长826.80.10.011.57.607.37
HCH98长827.24.35.50.87.696.99
IL1长820.50.02.51.011.8013.80
JG166长833.03.91.50.58.799.17
KH78长816.00.32.01.012.4014.35
LH92长813.50.00.014.58.517.03
MF7长828.06.31.31.76.196.67
NL17长832.80.28.01.38.098.67
OG79长818.00.00.614.55.276.11
PG79长822.00.40.314.06.995.71
QH219长831.82.03.50.39.8010.24
RH90长832.21.30.47.07.568.17
SH117长87.51.63.37.28.909.17
TF10长810.21.88.41.49.449.59

图6

姬塬地区长8储层孔隙度回归模型预测效果对比"

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"

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