天然气水合物藏开发品质评价研究

doi:10.13809/j.cnki.cn32-1825/te.2023.03.014

Abstract

Abstract:

The development of the natural gas hydrate reservoirs has the typical characteristics of high risk, high difficulty and high investment, so the correct evaluation of development quality is a prerequisite and the key to the issue. In order to solve the problems that the evaluation index has limitations and the evaluation results has ambiguity for the development of the natural gas hydrate reservoirs, the factor set is chosen based on the main controlling factors, and the scoring criteria of main controlling factors are defined. The weight set is established by the comprehensive weight calculated by analytic hierarchy process, and then fuzzy comprehensive evaluation of development quality of natural gas hydrate reservoir is further completed. This method is used to evaluate the development quality of Messoyakha and other typical natural gas hydrate reservoirs, and the applicability and feasibility of the method are verified, so as to provide theoretical basis and technical support for the efficient development of the natural gas hydrate reservoirs.

Key words: natural gas hydrate, development quality, fuzzy comprehensive evaluation, qualitative evaluation, analytic hierarchy process

CLC Number:

TE37

YU Qiannan,ZHANG Han,LI Ning,TANG Huimin,LI Chenglong,WU Zhuolin,PENG Wei. Development quality evaluation of natural gas hydrate reservoir[J].Petroleum Reservoir Evaluation and Development, 2023, 13(3): 385-392.

Figures/Tables 11

Table 1

Sensitivity analysis results of factors of development of natural gas hydrate reservoir"

分类	参数	符号	典型值	敏感度
工程地质参数	储层埋深/m	$D r$	600	1.73
	储层资源量/m³	$R r$	2.0×10¹⁰	9.79 $× 10 - 2$
	上覆水深/m	$D w$	1 000	6.12 $× 10 - 2$
	距海岸距离/m	$L r$	1 000	8.91 $× 10 - 3$
	储层倾角/（°）	$A r$	10	7.85 $× 10 - 4$
储层物性参数	原始地层温度/K	$T i$	283	10.35
	原始水合物饱和度	$S h i$	0.5	5.31
	地层岩石导热系数/[W/（m·K）]	$K r$	1	2.55
	原始地层压力/MPa	$p i$	20	1.03
	地层岩石孔隙度	$φ 0$	0.45	0.97
	地层渗透率/ $μ m 2$	$K$	2.0	9.01 $× 10 - 2$
	地层与井底压差/MPa	$? P g p$	2.0	5.08 $× 10 - 2$
	原始含水饱和度	$S w i$	0.5	4.65 $× 10 - 2$
	地层与井底温差/K	$T g p$	10	3.09 $× 10 - 2$
	地层岩石比热容/[J/（kg·K）]	$C r$	1 000	7.63 $× 10 - 3$
流体性质参数	水合物相平衡压力/MPa	$p e q$	8	7.24
	水合物比热容/[J/（kg·K）]	$C h$	1 900	3.88
	水合物分解速率常数/[kg/（m²·Pa·s）]	$k d$	3×10^-14	1.08
	甲烷比热容/[J/（kg·K）]	$C v g$	2.227×10³	5.12 $× 10 - 2$
	水密度/（kg/m³）	$ρ w$	0.997×10³	4.07 $× 10 - 2$
	甲烷黏度/（mPa·s）	$μ g$	11×10^-3	2.75 $× 10 - 2$
	气水毛管力/Pa	$p c$	2.0×10⁴	2.72 $× 10 - 2$
	水黏度/（mPa·s）	$μ w$	2.98	1.29 $× 10 - 2$
	水比热容/[J/（kg·K）]	$C w$	4.2×10³	9.65 $× 10 - 3$
	水合物密度/（kg/m³）	$ρ h$	0.9×10³	1.56 $× 10 - 3$
	水合物导热系数/[W/（m·K）]	$K h$	2.3	2.24 $× 10 - 4$
	水导热系数/[W/（m·K）]	$K w$	0.59	9.68 $× 10 - 5$
	甲烷导热系数/[W/（m·K）]	$K g$	0.025	3.23 $× 10 - 5$

Table 1

Table 2

Score of main control factors for development of natural gas hydrate reservoir"

评分	工程地质参数 $D r$ /m	储层物性参数					流体性质参数
评分	工程地质参数 $D r$ /m	$T i$ /K	$p i$ /MPa	$S h i$	$K r$ /[W/（m·K）]	$φ 0$	$C h$ /[J/（kg·K）]	$p e q$ /MPa	$k d$ /[kg/（m²·Pa·s）]
60	﹥900	﹤274	﹤5	﹤0.1	﹤0.2	﹤0.25	﹥2 100	﹥10	﹤10^-16
70	600~900	274~278	5~10	0.1~0.3	0.2~0.4	0.25~0.35	1 900~2 000	8~10	10^-16~10^-15
80	300~600	278~283	10~20	0.3~0.5	0.4~1.0	0.35~0.45	1 800~1 900	6~8	10^-15~10^-14
90	150~300	283~288	20~30	0.5~0.7	1~2	0.45~0.55	1 700~1 800	4~6	10^-14~10^-13
100	﹤150	﹥288	﹥30	﹥0.7	﹥2	﹥0.55	﹤1 700	﹤4	﹥10^-13

Table 2

Fig. 1

Table 3

Table 4

Table 5

Judgment matrix of physical parameters of natural gas hydrate reservoir"

参数	$T i$	$p i$	$S h i$	$K r$	$φ 0$	权重
$T i$	1	7	2	5	7	0.506 5
$p i$	0.143	1	0.333	2	1	0.019 7
$S h i$	0.5	3	1	3	3	0.247 0
$K r$	0.2	0.5	0.333	1	2	0.085 4
$φ 0$	0.143	1	0.333	0.5	1	0.069 5

Table 5

Table 6

Judgment matrix of fluid property parameters of natural gas hydrate reservoir"

参数	$C h$	$p e q$	$k d$	权重
$C h$	1	0.5	3	0.309 0
$p e q$	2	1	5	0.581 6
$k d$	0.333 3	0.2	1	0.109 5

Table 6

Table 7

Comprehensive weight of main control factors for development of natural gas hydrate reservoir"

参数	工程地质参数 $D r$		储层物性参数						流体性质参数
参数	工程地质参数 $D r$		$T i$	$p i$	$S h i$	$? ? K r$	$φ 0$		$C h$	$p e q$	$k d$
权重	0.090 9		0.230 2	0.041 7	0.112 2	0.038 8	0.031 6		0.140 4	0.264 3	0.049 8

Table 7

Table 8

Main control factors for development quality evaluation of typical natural gas hydrate reservoir"

天然气水合物藏	工程地质参数 $D r$ /m	储层物性参数					流体性质参数
天然气水合物藏	工程地质参数 $D r$ /m	$T i$ /K	$p i$ /MPa	$S h i$	$K r$ /[W/（m·K）]	$φ 0$	$C h$ /[J/（kg·K）]	$p e q$ /MPa	$k d$ /[kg/（m²·Pa·s）]
Messoyakha	750	282.25	7.8	0.45	0.56	0.25	1 800	6.8	2.9×10^-14
Mallik	950	282.95	11.2	0.40	0.89	0.35	2 000	10.2	3.7×10^-14
Alaska	650	282.65	7.5	0.40	0.72	0.27	1 800	6.6	2.5×10^-14
Nankai Trough	300	283.75	13.5	0.35	1.37	0.35	2 000	10.0	1.2×10^-13
神狐	150	283.15	8.9	0.30	1.58	0.38	2 000	8.5	9.8×10^-12

Table 8

Table 9

Table 10

Evaluation results of single factor of typical natural gas hydrate reservoirs"

天然气水合物藏	工程地质参数 $D r$	储层物性参数					流体性质参数			评价结果 Q	开发品质等级
天然气水合物藏	工程地质参数 $D r$	$T i$	$p i$	$S h i$	$K r$	$φ 0$	$C h$	$p e q$	$k d$	评价结果 Q	开发品质等级
Messoyakha	70	80	80	80	80	70	80	80	80	78.77	Ⅱ级
Mallik	60	80	70	80	80	80	70	60	80	70.61	Ⅲ级
Alaska	70	80	70	80	80	70	80	80	80	76.95	Ⅱ级
Nankai Trough	90	90	80	80	90	80	70	70	90	80.04	Ⅰ级
神狐	90	90	70	80	90	80	70	70	100	81.63	Ⅰ级

Table 10

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开发品质等级	定性评价评语	开发品质评分
Ⅰ级	开发品质优秀	>80
Ⅱ级	开发品质良好	75~80
Ⅲ级	开发品质中等	70~75
Ⅳ级	开发品质较差	<70

Development quality evaluation of natural gas hydrate reservoir

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