柳江盆地二叠系山西组露头致密砂岩储层非均质性表征方法

doi:10.11743/ogg20230217

Abstract

Abstract:

Tight sandstone in outcropped Permian Shanxi Formation of the Liujiang Basin is highly heterogeneous as a result of various affecting factors， making quantitatively characterization of the feature quite a headache to parties of interest. A systematic and intensive sampling of the tight sandstone were performed and reservoir properties and relevant quantitative data were obtained through geological statistical analysis， testing and microscopic observation of thin sections. Hendrik Lorentz curves were drawn based on the analysis and the analytic hierarchy process （AHP） was also applied to determine the weights of influence factors such as permeability， porosity， surface porosity， matrix content and particle size， with a comprehensive and quantitative characterization method of the heterogeneity proposed. The study shows that the tight sandstones are highly heterogeneous with nearly identical porosity-permeability characteristics at both the vertical and lateral directions， indicating the invalidity of traditional assessment parameters such as breakthrough coefficient， variation coefficient and gradient in heterogeneity characterization due to the poor correlation between porosity and permeability. Meanwhile， the proposed method yields better results that fit well with the field observation. This method is also applicable to the description of heterogeneity of other types of unconventional reservoirs.

Key words: heterogeneity, quantitative characterization, Lorentz coefficient, field outcrop, tight sandstone, Shanxi Formation, Liujiang Basin

CLC Number:

TE122.2

Hongqi YUAN, Xinyu DENG, Huiyao DU, Yinghua YU, Fengming XU. Characterizing the heterogeneity of tight sandstone in outcropped Permian Shanxi Formation， Liujiang Basin[J]. Oil & Gas Geology, 2023, 44(2): 468-479.

Figures/Tables 16

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层号
层号	次生加大石英	玉髓	水白云母	高岭石	铁质胶结物	浊沸石
12	1.00	0	0.60	0.70	3.33	0
1l	1.30	0	0.70	0.70	3.33	0
10	1.00	0	0	1.00	4.00	0
9	1.67	0	0	2.00	2.67	0.67
8	1.67	4.67	2.30	0	3.33	0
7	2.30	1.83	0.17	0.30	1.17	2.00
6	2.75	6.25	1.25	3.25	1.00	0
5	2.25	6.50	2.00	0.25	0.50	0
4	2.25	6.50	1.00	0	1.00	0
3	3.50	6.50	2.00	0	2.00	0
2	3.60	5.40	0.70	0.20	1.10	0.60
1	3.00	0	1.00	1.00	0	0

层号及岩柱方向		渗透率/（10^-3 μm²）		V_k	T_k	J_k
层号及岩柱方向	最大值	最小值	平均值	V_k	T_k	J_k
第11层V	0.433 54	0.001 86	0.088 94	2.16	4.87	232.83
第10层V	0.063 25	0.000 02	0.019 74	1.45	3.20	2 461.41
第9层V	0.001 86	0.000 08	0.000 85	0.89	2.17	21.18
第9层H	0.004 52	0.000 05	0.001 04	1.86	4.33	89.53
第8层V	0.001 94	0.000 22	0.001 18	0.62	1.64	8.61
第8层H	0.526 65	0.000 62	0.107 08	2.19	4.91	836.89
第7层V	0.052 72	0.001 32	0.013 68	1.60	3.85	39.92
第7层H	0.027 19	0.001 26	0.013 44	0.79	2.02	21.50
第6层V	0.038 30	0.003 57	0.017 36	0.81	2.20	10.71
第6层H	0.038 66	0.003 92	0.019 62	0.76	1.96	9.85
第5层V	0.098 56	0.003 72	0.032 90	1.18	2.99	26.48
第5层H	0.068 01	0.005 41	0.033 10	0.84	2.05	12.55
第4层V	0.073 75	0.006 77	0.032 92	0.84	2.24	10.89
第4层H	0.110 90	0.006 47	0.043 94	1.07	2.52	17.12
第3层V	0.023 69	0.001 62	06 68	1.42	3.54	14.57
第3层H	0.058 53	0.003 13	0.019 35	1.20	3.02	18.69
第2层V	0.024 67	0.008 42	0.016 36	0.45	1.50	2.92

目标层A	准则层B	指标层C
储层非均质性A	正向指标B₁	渗透率C₁
		面孔率C₂
		孔隙度C₃
	负向指标B?	填隙物含量C₄
		粒度C₅
		石英含量C₆

层次模型	判断矩阵				权重	一致性检验
A-B		B₁		B₂		λ_max=2.000 0
	B₁	1		7	0.875 0	CI=0
	B₂	1/7		1	0.125 0	CR=0
B₁-C		C₁	C₂	C₃
	C₁	1	2	5	0.581 6	λ_max=3.003 6
	C₂	1/2	1	3	0.309 0	CI=0.001 8
	C₃	1/5	1/3	1	0.109 5	CR=0.003 6
B₂-C		C₄	C₅	C₆
	C₄	1	2	3	0.539 6	λ_max=3.009 2
	C₅	1/2	1	2	0.292 0	CI=0.004 6
	C₆	1/3	1/2	1	0.163 4	CR=0.008 8

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Characterizing the heterogeneity of tight sandstone in outcropped Permian Shanxi Formation， Liujiang Basin

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