碱性长石溶蚀微孔发育特征及其对致密砂岩储层物性的改造作用

doi:10.11743/ogg20220314

Abstract

Abstract:

Secondary dissolved pores in feldspar account for a major part of the micro-nano pore-throat system in tight sandstone reservoirs. To further clarify the characteristics of these pores and their contribution to improved physical properties of tight sandstone reservoirs， this paper takes the third sub-member of the sixth member of Yanchang Formation （Chang-6³） in the Huaqing area， Ordos Basin as the research object. The energy-dispersive spectrometry is used to obtain the distribution and composition characteristics of sodium and potassium of all kinds of feldspar in the member and field emission environmental scanning electron microscope images of feldspar samples are processed binarily to extract parameters with Image J software. Two kinds of feldspar， wavy perthite and mottled perthite， with typical dissolution characteristics are imaged and analyzed to establish a method for evaluating the contribution of the dissolved pores to reservoir space based on dissolution intensity parameters and the impact of feldspar dissolution on pore development. Parameters for characterizing feldspar development， dissolution rate， porosity contribution are determined. The results show that the dissolved micropores in alkali feldspar in the study area are mostly in banded and honeycombed morphology as a result of weak dissolution. The porosity contribution rate is between 2.06 % and 35.20 %， with an average of 13.99 %. Moreover， the proportion of pore area formed by dissolution is negatively correlated with the potassium ion enrichment area size in alkali feldspar.

Key words: alkali feldspar, dissolved pore, reservoir physical property, tight sandstone reservoir, Yanchang Formation, Ordos Basin

CLC Number:

TE122.2

Guangyuan Sun, Zhelin Wang, Peigang Liu, Zhiqiang Zhang. Dissolved micro-pores in alkali feldspar and their contribution to improved properties of tight sandstone reservoirs： A case study from Triassic Chang-6³ sub-member， Huaqing area， Ordos Basin[J]. Oil & Gas Geology, 2022, 43(3): 658-669.

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分类	测试编号	矿物类型	元素含量/%
分类	测试编号	矿物类型	K	Na	Ca	Al	Si	C	O
波状条纹长石	1	钾长石	5.13	0.77	0	6.43	19.44	2.70	65.53
	2	钾长石	4.82	1.04	0	6.24	19.89	4.29	63.72
	3	钾长石	5.22	0.70	0	6.06	19.44	2.79	65.79
	4	钾长石	7.01	0	0	5.51	18.40	2.64	66.44
	5	钾长石	5.14	0.75	0	6.21	19.33	3.84	64.73
	6	钾长石	4.76	0	0	6.17	17.32	11.29	60.46
	平均值		5.35	0.54	0	6.10	18.97	4.59	64.45
	7	钠长石	0	5.96	0	5.85	19.48	2.38	66.33
	8	钠长石	0	6.28	0.58	6.48	17.85	3.05	65.76
	9	钠长石	0	5.73	0	6.00	18.76	3.63	65.88
	10	钠长石	0	6.17	0.65	6.82	18.66	3.14	64.56
	11	钠长石	0	5.65	0	5.60	16.98	12.63	59.14
	12	钠长石	0	6.27	0	6.00	18.63	6.06	63.04
	平均值		0	6.01	0.62	6.13	18.39	5.15	64.12
斑块状条纹长石	1	钾长石	4.99	0	0	6.27	20.42	3.60	64.72
	2	钾长石	5.14	0.71	0	5.90	19.00	4.68	64.57
	3	钾长石	5.49	0.26	0	6.17	19.40	3.32	65.36
	4	钾长石	5.41	0.26	0	6.23	19.04	3.45	65.61
	5	钾长石	5.68	0.67	0	5.86	18.76	2.86	66.17
	6	钾长石	5.29	0.38	0	6.57	19.76	3.85	64.15
	平均值		5.33	0.38	0	6.17	19.40	3.63	65.10
	7	钠长石	0	5.95	0.82	7.06	18.21	2.37	65.59
	8	钠长石	0	6.56	0	6.18	18.80	4.19	64.27
	9	钠长石	0	6.23	0.54	6.32	18.72	3.16	65.03
	10	钠长石	0	6.27	0	6.11	18.99	2.51	66.12
	11	钠长石	0	5.30	0	4.80	14.99	17.74	57.17
	12	钠长石	0	6.65	0	6.26	19.49	2.51	65.09
	平均值		0	6.16	0.68	6.12	18.20	5.41	63.88

矿物类型	长石溶蚀过程反应式	反应前、后矿物体积差/cm³	参加反应矿物总体积/cm³	理论溶蚀孔隙度/%
钾长石	初期：1 mol钾长石→1/2 mol高岭石+2 mol石英	-14.05	109.1	12.88
钾长石	后期：1 mol钾长石→1/3 mol伊利石+2 mol石英	-16.80	109.1	15.40
钠长石	初期：1 mol钠长石→1/2 mol高岭石+2 mol石英	-5.15	100.2	5.14
钠长石	后期：1 mol钠长石→1/3 mol伊利石+2 mol石英	-7.93	100.2	7.91
钙长石	初期：1 mol钙长石→1 mol高岭石	-1.40	100.7	1.39
钙长石	后期：1 mol钙长石→2/3 mol伊利石	-6.97	100.7	6.92

样品编号	溶孔率/%		总孔隙度/ %	溶孔贡献率/%		总溶孔贡献率/%	溶蚀强度判定
样品编号	钾长石	钠长石	总孔隙度/ %	钾长石	钠长石	总溶孔贡献率/%	溶蚀强度判定
2	0.70	0.33	10.90	6.43	3.03	9.45	弱溶蚀
4	0.60	0.28	5.95	10.14	4.78	14.92	弱溶蚀
7	1.16	0.55	8.84	13.16	6.20	19.37	中溶蚀
11	0.22	0.10	15.38	1.40	0.66	2.06	弱溶蚀
13	0.36	0.17	14.03	2.53	1.19	3.73	弱溶蚀
14	0.79	0.37	7.82	10.15	4.78	14.93	弱溶蚀
16	0.84	0.40	8.00	10.51	4.95	15.46	中溶蚀
17	0.48	0.23	7.49	6.47	3.05	9.52	弱溶蚀
18	1.63	0.77	6.83	23.93	11.28	35.20	强溶蚀
19	0.61	0.29	10.40	5.91	2.78	8.69	弱溶蚀
23	0.27	0.13	8.58	3.18	1.50	4.68	弱溶蚀
25	0.95	0.45	10.70	8.86	4.18	13.04	弱溶蚀
26	1.31	0.62	8.08	16.18	7.63	23.81	中溶蚀
27	1.53	0.72	10.74	14.28	6.73	21.01	中溶蚀

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Dissolved micro-pores in alkali feldspar and their contribution to improved properties of tight sandstone reservoirs： A case study from Triassic Chang-6³ sub-member， Huaqing area， Ordos Basin

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Dissolved micro-pores in alkali feldspar and their contribution to improved properties of tight sandstone reservoirs： A case study from Triassic Chang-63 sub-member， Huaqing area， Ordos Basin

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Dissolved micro-pores in alkali feldspar and their contribution to improved properties of tight sandstone reservoirs： A case study from Triassic Chang-6³ sub-member， Huaqing area， Ordos Basin