深部致密煤藏适度就地气化可行性评价方法及应用

doi:10.13809/j.cnki.cn32-1825/te.2025.02.008

Abstract

Abstract:

In order to establish a systematic evaluation of deep tight coal reservoirs and ensure the efficient, economic and safe implementation of moderate in-situ gasification projects in deep tight coal reservoirs, a feasibility evaluation method based on fuzzy analytic hierarchy process was developed. The methodology comprises: (1) the establishment of an evaluation index set of 3 first-level indicators, including resource conditions, reservoir conditions and preservation conditions, and 18 second-level indicators, including parameters such as coal rank, coal rock reservoir thickness, and coal rock reservoir pressure coefficient, along with a graded comment set categorizing outcomes as “feasible”, “basically feasible”, and “infeasible”; (2) the determination of indicator weights through the analytic hierarchy process; (3) the calculation of each indicator’s membership degree using a trapezoidal membership function to construct an evaluation matrix; and (4) the synthesis of the evaluation and weight matrices to ascertain the membership degrees corresponding to “feasible”, “basically feasible”, and “infeasible” for candidate areas, thus determining the feasibility based on the principle of maximum membership degree. The evaluation method was applied to the feasibility evaluation of moderate in-situ gasification for the deep No. 8 tight coal reservoir in the M block of the Ordos Basin. The evaluation results show that the membership degrees of “feasible”, “basically feasible” and “infeasible” for moderate in-situ gasification of No. 8 coal reservoir in the deep part of M block are 0.413, 0.425 and 0.162 respectively, with the maximum being 0.425, thus determining the feasibility as “basically feasible”. The comprehensive quantitative feasibility evaluation method of moderate in-situ gasification of deep tight coal reservoir, which places particular emphasis on the evaluation of preservation conditions, provides scientific guidance for the implementation of moderate in-situ gasification projects in deep tight coal reservoirs.

Key words: tight coal & gas reservoir, moderate in-situ gasification, fuzzy analytic hierarchy process, feasibility evaluation, evaluation of coal rock reservoir

CLC Number:

TE357

KANG Yili,SHAO Junhua,LIU Jiarong, et al. Feasibility evaluation method and application of moderate in-situ gasification in deep tight coal & gas reservoirs[J]. Petroleum Reservoir Evaluation and Development, 2025, 15(2): 237-249.

Figures/Tables 15

Fig. 1

Table 1

Table 2

Table 3

Table 4

Table 5

Fig.2

Table 6

Evaluation indicator membership functions"

函数类型	“可行”	“基本可行”	“不可行”
成本型	$A (x) = 1 x ≤ r 1 r 2 - x r 2 - r 1 r 1 < x < r 2 0 x ≥ r 2$	$A (x) = 0 x ≤ r 1 x - r 1 r 2 - r 1 r 1 < x ≤ r 2 r 3 - x r 3 - r 2 r 2 < x < r 3 0 x ≥ r 3$	$A (x) = 0 x ≤ r 2 x - r 2 r 3 - r 2 r 2 < x < r 3 1 x ≥ r 2$
效益型	$A (x) = 0 x ≤ r 2 x - r 2 r 3 - r 2 r 2 < x < r 3 1 x ≥ r 3$	$A (x) = 0 x ≤ r 1 x - r 1 r 2 - r 1 r 1 < x ≤ r 2 r 3 - x r 3 - r 2 r 2 < x < r 3 0 x ≥ r 3$	$A (x) = 1 x ≤ r 1 r 2 - x r 2 - r 1 r 1 < x < r 2 0 x ≥ r 2$
中间型	$A (x) = 0 x ≤ r' x - r' r 2 - r' r' < x ≤ r 2 r ″ - x r ″ - r 2 r 2 < x < r ″ 0 x ≥ r ″$	$A (x) = 0 x ≤ r 1 x - r 1 r' - r 1 r 1 < x ≤ r' r 2 - x r 2 - r' r' < x < r 2 x - r 2 r ″ - r 2 r 2 < x ≤ r ″ r 3 - x r 3 - r ″ r ″ < x < r 3 0 x ≥ r 3$	$A (x) = 1 x ≤ r 1 r' - x r' - r 1 r 1 < x ≤ r' x - r ″ r 3 - r ″ r ″ < x < r 3 1 x ≥ r 3$

Table 6

Table 7

Fuzzy classification of evaluation indicator membership functions"

一级指标	二级指标	模糊等级划分值
一级指标	二级指标	r₁	r'	r₂	$r ″$	r₃
资源条件	煤级	0.1		0.2		0.3
	水分/%	15		35		55
	灰分/%	20		35		50
	挥发分/%	10		30		50
	硫分/%	1		2.5		4
储集条件	煤岩储层厚度/m	2	3	5	9	12
	煤岩储层倾角/（°）	12	23	35	52	70
	煤岩储层埋深/m	500	1 500			4 500
	原生结构煤和碎裂煤占比/%	30	50	2 500	3 500	70
	煤岩储层连续性及变化趋势/%	25		45		65
	夹矸层厚度/m	0.4		0.8		1.0
保存条件	含水层类型	0.1		0.2		0.3
	断层断距/m	0.6		1.8		3.0
	距断层距离/m	50		125		200
	顶盖层岩性	0.1		0.2		0.3
	δ_coal/δ_rc	0.590	0.107	0.154	0.297	0.414
	煤岩储层含气量/（m³/t）	8		17		35
	煤岩储层压力系数	0.7		1.2		1.6

Table 7

Table 8

Fig. 3

Fig.4

Table 9

Table 10

Table 11

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煤岩组分	资源条件评级
煤岩组分	优	良	中	劣
水分	（0，15]	（15，35]	（35，55]	>55
挥发分	（0，10]	（10，30]	（30，50]	>50
灰分	（0，20]	（20，35]	（35，50]	>50
硫分	（0，1.0]	（1.0，2.5]	（2.5，4.0]	>4.0
固定碳	（0，62.0]	（62.0，64.5]	（64.5，67.0]	>67.0

煤岩储层连续性及变化趋势指标	资源禀赋评级
煤岩储层连续性及变化趋势指标	优	良	中	劣
煤岩储层厚度变化率/%	≤25	（25，45]	（45，65]	>65
夹矸层厚度变化率/%	≤20	（20，40]	（40，60]	>60
夹矸层厚度/m	≤0.4	（0.4，0.8]	（0.8，1.0]	>1.0

地层水水型	总矿化度/（mg/L）	区带类型
CaCl₂	>20 000	承压水区
NaHCO₃	>5 000~20 000	弱径流区
NaHCO₃或Na₂SO₄	>1 000~5 000	强径流区
Na₂SO₄	≤1 000	供水区或泄水区

一级指标	二级指标	分类评价级别
一级指标	二级指标	优	良	中	劣
资源条件	煤级	HM/CY	SM/QM	FM/PM	WY/JM
	水分/%	（0，15]	（15，35]	（35，55]	>55
	灰分/%	（0，20]	（20，35]	（35，50]	>50
	挥发分/%	（0，10]	（10，30]	（30，50]	>50
	硫分/%	（0，1]	（1，2.5]	（2.5，4]	>4
储集条件	煤岩储层厚度/m	5	（5，12]	[2，5）	<2或>12
	煤岩储层倾角/°	35	[12，35）	（35，70]	<12或>70
	煤岩储层埋深/m	（1 500，2 500]	（1 000，1 500] （2 500，3 500]	（500，1 000] （3 500，4 500）	≤500或≥4 500
	原生结构煤和碎裂煤占比/%	>70	（50，70]	（30，50]	≤30
	煤岩储层连续性及变化趋势/%	≤25	（25，45]	（45，65]	>65
	煤岩储层夹矸层厚度/m	≤0.4	（0.4，0.8]	（0.8，1]	>1
保存条件	含水层类型	承压水区	弱径流区	强径流区	供水区/泄水区
	断层断距/m	（0，0.1δ]	（0.1δ，0.3δ]	（0.3δ，0.5δ]	>0.5δ
	煤岩储层距断层距离/m	>200	（125，200]	（50，125]	≤50
	顶盖层岩性	泥岩、粉砂质泥岩、膏质盐岩	粉砂岩、细砂岩、泥灰岩	中砂岩	粗砂岩
	δ_coal/δ_rc	0.154	（0.154，0.414]	[0.059，0.154）	<0.059或>0.414
	煤岩储层含气量/（m³/t）	（20，35]	（15，20]	（8，15]	≤8
	煤岩储层压力系数	>1.6	（1.2，1.6]	（0.7，1.2]	≤0.7

一级指标	权重	二级指标	同级权重	综合权重
资源条件	0.28	煤级	0.51	0.14
		水分	0.03	0.01
		灰分	0.06	0.02
		挥发分	0.27	0.07
		硫分	0.13	0.04
储集条件	0.60	煤岩储层厚度	0.27	0.16
		煤岩储层倾角	0.13	0.08
		煤岩储层埋深	0.21	0.13
		原生结构煤和碎裂煤占比	0.04	0.02
		煤岩储层连续性及变化趋势	0.22	0.13
		夹矸层厚度	0.13	0.08
保存条件	0.12	含水层类型	0.08	0.01
		断层断距	0.08	0.01
		煤岩储层距断层距离	0.10	0.01
		顶盖层岩性	0.14	0.02
		δ_coal/δ_rc	0.20	0.02
		煤岩储层含气量	0.18	0.02
		煤岩储层压力系数	0.22	0.03

Feasibility evaluation method and application of moderate in-situ gasification in deep tight coal & gas reservoirs

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井名	δ_coal/m	δ_rc/m	δ_coal/δ_rc	盖层厚度评级
M1	1.25	34.375	0.036	劣
M2	7.75	31.125	0.249	良
M3	6.75	31.625	0.213	良
M5	5.50	32.250	0.171	良
M6	3.13	33.438	0.093	中
M7	5.50	32.250	0.171	良
M8	6.50	31.750	0.205	良

一级指标	二级指标	“可行”	“基本可行”	“不可行”
资源条件	煤级	0.000 0	0.500 0	0.500 0
	水分	1.000 0	0.000 0	0.000 0
	灰分	0.000 0	0.677 0	0.323 0
	挥发分	0.214 5	0.785 5	0.000 0
	硫分	0.200 0	0.800 0	0.000 0
储集条件	煤岩储层厚度	0.350 0	0.650 0	0.000 0
	煤岩储层倾角	0.000 0	0.000 0	1.000 0
	煤岩储层埋深	0.400 0	0.600 0	0.000 0
	原生结构煤和碎裂煤占比	0.000 0	0.632 5	0.367 5
	煤岩储层连续性及变化趋势	0.750 0	0.250 0	0.000 0
	夹矸层厚度	1.000 0	0.000 0	0.000 0
保存条件	含水层类型	1.000 0	0.000 0	0.000 0
	断层断距	1.000 0	0.000 0	0.000 0
	距断层距离	1.000 0	0.000 0	0.000 0
	顶盖层岩性	1.000 0	0.000 0	0.000 0
	δ_coal/δ_rc	0.937 1	0.062 9	0.000 0
	煤岩储层含气量	0.277 8	0.722 2	0.000 0
	煤岩储层压力系数	0.620 0	0.380 0	0.000 0

评价目标与指标	“可行”	“基本可行”	“不可行”
资源条件	0.114	0.612	0.274
储集条件	0.474	0.382	0.144
保存条件	0.774	0.226	0.000
8号煤藏适度就地气化可行性	0.413	0.425	0.162

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