基于测井的煤层力学特性评价及煤层气开发有利区预测

邱峰; 刘晋华; 蔡益栋; 刘大锰; 孙逢瑞

doi:10.12363/issn.1001-1986.22.10.0808

基于测井的煤层力学特性评价及煤层气开发有利区预测—以沁南郑庄区块3号煤层为例

doi: 10.12363/issn.1001-1986.22.10.0808

邱峰^{1, 2,},
刘晋华^{1, 2},
蔡益栋^{1, 2,*, ,},
刘大锰^{1, 2},
孙逢瑞^{1, 2}

1.
中国地质大学(北京) 能源学院，北京 100083
2.
煤层气开发利用国家工程研究中心煤储层物性实验性，北京 100083

基金项目: 国家自然科学基金项目(42130806，41922016)

详细信息

第一作者:
邱峰，1993年生，男，河北保定人，博士研究生，从事煤层气地质与开发工作. E-mail：3006210001@email.cugb.edu.cn

通信作者:
蔡益栋，1985年生，男，江苏盐城人，博士，教授，从事非常规油气地质与开发工作. E-mail：yidong.cai@cugb.edu.cn

中图分类号: P618.11
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- 文章访问数: 85
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- 被引次数: 0
出版历程
- 收稿日期: 2022-10-12
- 修回日期: 2023-01-11
- 刊出日期: 2023-04-25
- 网络出版日期: 2023-04-14

Mechanical property evaluation of coal bed and favorable area prediction of coalbed methane (CBM) development based on well logging: A case study of No. 3 coal bed in Zhengzhuang Block, southern Qinshui Basin

QIU Feng^{1, 2
,},
LIU Jinhua^{1, 2},
CAI Yidong^{1, 2,*
, ,},
LIU Dameng^{1, 2},
SUN Fengrui^{1, 2}

1.
School of Energy Resources, China University of Geosciences (beijing), Beijing 100083, China
2.
Coal Reservoir Laboratory of National Engineering Research Center of CBM Development & Utilization, China University of Geosciences, Beijing 100083, China

摘要

摘要: 准确掌握煤岩力学性质对储层改造及煤层气开发具有重要意义，以郑庄区块3号煤层为研究层位，建立以多测井参数为基础的煤储层横波时差预测模型和以动静态力学参数转换为依据的脆性指数评价模型；利用弹性参数法对研究区内煤储层脆性指数进行了综合评价，发现单井中煤层脆性指数受“边界效应”影响明显且分布具有区域性；脆性指数与煤体结构指数存在正相关关系，并据此提出以脆性指数为依据的煤体结构划分标准；脆性指数与抗压强度、抗拉强度均为负相关关系；四维地震裂缝监测结果显示碎裂结构煤压裂效果最好，原生结构煤次之，碎粒结构煤最差；最后，以含气量与脆性指数为主要评价参数，预测了区块内煤层气开发地质有利区，为煤储层压裂设计提供了依据。
- 力学参数 /
- 测井评价 /
- 脆性指数 /
- 煤体结构 /
- 有利区优选
Abstract: Accurately grasping the mechanical properties of coal is of great significance to reservoir reconstruction and CBM development. Herein, the prediction model of shear wave time difference in coal reservoir based on multiple logging parameters and the brittleness index evaluation model based on dynamic and static mechanical parameter conversion were established for the research horizon of No.3 coal bed in Zhengzhuang Block. The brittleness index of coal reservoir in the study area was comprehensively evaluated by elastic parameter method. By this way, it is found that the brittleness index of coal bed in single well is obviously affected by “boundary effect” and in regional distribution. Besides, the brittleness index is positively correlated to the coal structure index, and put forward the classification standard of coal structure based on brittleness index. The brittleness index is negatively correlated with the compressive and tensile strength. In addition, the results of four-dimensional seismic fracture monitoring show that the coal in cataclastic structure has the best fracturing effect, followed by the coal in primary structure and granulitic structure successively. Finally, the favorable area of CBM development in the block was predicted with gas content and brittleness index as the main evaluation parameters, which provides a basis for the fracturing design of coal reservoir.
- mechanical parameters /
- logging evaluation /
- brittleness index /
- coal structure /
- favorable area optimization

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图 1 郑庄区块构造地质与地层综合柱状图^[20]

Fig. 1 Structural geology and composite stratigraphic histogram of Zhengzhuang Block

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图 2 DTS计算值与测量值相关性拟合

Fig. 2 Correlation fitting of DTS calculated and measured values

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图 3 多元回归模型DTS计算值与测量值相关性拟合

Fig. 3 Correlation fitting of DTS calculated and measured values of different multiple regression models

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图 4 郑庄区块3号煤层的动、静态力学参数拟合

Fig. 4 Fitting of dynamic and static mechanical parameters of No.3 coal bed in Zhengzhuang Block

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图 5 郑庄区块典型井3号煤层测井反演脆性指数结果剖面

Fig. 5 Profile of well logging inversion results of brittleness index of No. 3 coal bed in typical well of Zhengzheng Block

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图 6 郑庄区块3号煤层脆性指数均值分布

Fig. 6 Distribution of average brittleness index of No.3 coal bed in Zhengzhuang Block

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图 7 郑庄区块3号煤层煤体结构指数(CSI)数值统计

Fig. 7 Numerical statistics on coal structure index (CSI) of No.3 coal bed in Zhengzhuang Block

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图 8 脆性指数与煤层变形程度的关系

Fig. 8 Relationship between brittleness index and deformation degree of coal bed

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图 9 脆性指数与力学参数关系

Fig. 9 Relationship between brittleness index and mechanical parameters

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图 10 郑庄区块3号煤层脆性指数与主缝长关系

Fig. 10 Relation of brittleness index and main seam length in No.3 coal bed of Zhengzhuang Block

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图 11 郑庄区块3号煤层煤层气开发地质有利区预测

Fig. 11 Prediction of geological favorable area for CBM development of No.3 coal bed in Zhengzhuang Block

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表 1 煤层DTS与常规测井响应相关性绝对值参数

Table 1 Absolute value parameters of correlation between DTS and conventional well logging response of coal bed

测井参数	DTC	CAL	CNL	DEN	GR
DTS	0.802	0.452	0.716	0.751	0.664

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表 2 脆性指数与煤体结构分类

Table 2 Brittleness index and coal structure classification

煤体结构	CSI	脆性指数B	脆性指数分类
原生结构煤	<40	[0,47)	Ⅰ型
碎裂煤	40~65	[47,60]	Ⅱ型
碎粒煤	40~65	(60,74]	Ⅲ型
糜棱煤	>65	[74,100]	Ⅳ型

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表 3 煤体结构分类结果验证

Table 3 Verification of coal structure classification results

样品编号	深度/m	CSI	脆性指数B	煤体结构类型	煤心图片
S31-3	603.14~603.47	61.53	59.38	Ⅱ型
S39-3	995.41~995.92	69.12	85.85	Ⅳ型
S66-4	1075.62~1076.11	15.52	39.77	I型
S97-1	1259.60~1260.05	52.82	67.21	Ⅲ型
S97-3	1260.60 ~ 1261.05	30.07	42.85	I型

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表 4 郑庄区块3号煤层水力压裂裂缝监测统计

Table 4 Hydraulic fracture monitoring of No.3 coal bed in Zhengzhuang Block

井号	脆性指数均值	总长/m	缝高/m	方位/(°)
S30	65.9	152.0	6.7	北东56.2
S64	35.4	170.7	6.7	北东81.8
S73	41.9	197.7	6.6	北东70.0
S76	61.4	187.8	7.4	北东56.1
S78	68.3	160.0	10.7	北东64.7
S80	51.2	216.7	6.8	北东49.6
S83	47.0	197.9	7.5	北东64.5
S86	49.9	202.7	6.5	北东54.5
S91	52.0	181.4	7.5	北东60.2
S94	48.7	212.4	9.0	北东55.0
S97	57.1	220.9	5.7	北东42.0
S100	65.4	178.0	6.7	北西85.0

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表 5 郑庄区块3号煤层气开发地质评价参数及评价标准

Table 5 Geological prediction parameters and evaluation criterion for CBM development of No. 3 coal bed in Zhengzhuang Block

参数	权重	划分指标	评价指数
脆性指数	0.6	<45	60
		45~60	90
		>60	30
含气量/(m³·t⁻¹)	0.4	<15	30
		15~23	60
		>23	90

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