川西坳陷马井地区中三叠统雷四3亚段储层孔隙类型与面孔率定量研究

doi:10.11743/ogg20200214

摘要/Abstract

摘要：

为了研究川西坳陷马井地区中三叠统雷口坡组雷四³亚段储集空间类型及特征，以A1井为典型井，利用薄片资料、孔渗测试资料和面孔率定量分析等方法，开展川西坳陷马井地区雷四³亚段储层特征及储层孔隙定量分析。研究认为晶间孔、晶间溶孔、裂缝是马井地区雷四³亚段主要储集空间类型，粒间（溶）孔、粒内（溶）孔、铸模孔、格架孔、窗格孔和溶缝为次要储集空间类型，主要发育在云坪、藻云坪、含灰藻云坪沉积环境中，发育的岩石类型主要为晶粒白云岩、晶粒颗粒白云岩、颗粒晶粒白云岩和（含）灰质白云岩中。马井地区雷四³亚段上储层段的主要储层岩石类型为晶粒颗粒（含）白云质灰岩，下储层段中的主要储层岩石类型为晶粒白云岩和晶粒颗粒白云岩。利用面孔率定量分析方法统计不同岩石类型的平均面孔率，与平均孔隙度相对比，面孔率定量研究方法同孔隙度测试结果变化趋势一致。该方法可以分别统计不同沉积微相类型、不同岩石类型和不同储集空间类型的面孔率，可以为碳酸盐岩储层特征的精细研究提供支撑。

关键词: 面孔率定量分析, 储集空间, 雷口坡组, 马井地区, 四川盆地

Abstract:

Quantitative analysis of the characteristics and porosity of the reservoir in the third interval of the 4th member of Middle Triassic Leikoupo Formation (T₂l^4-3) in Majing area, Western Sichuan Basin, was carried out through thin section observation, physical property analysis, and thin section porosity quantification of the reservoirs in Well A1.The results show that the reservoirs are mainly developed in dolomitic flat, algal dolomitic flat and lime-algal dolomitic flat, with intercrystalline pores, intercrystalline dissolved pores and fractures as the dominant pore types, and intergranular (dissolved) pores, intragranular (dissolved) pores, moldic pores, framework pores, fenestral pores and dissolved fractures as the minor pore types.In addition, the main rock types were identified therein as crystalline dolomite, crystalline granular dolomite, granular crystalline dolomite, and lime dolomite.Among others, dolomitic limestone of crystalline granular type dominates in the reservoir of the upper section of T₂l^4-3, while grained crystalline dolomite and crystalline granular dolomite dominate in the reservoir of the lower section of T₂l^4-3 in Majing area.The quantified thin section porosity is well correlated with the tested porosity for different types of rock.What's more, the quantitative analysis can be applied to calculate the thin section porosity of different sedimentary microfacies, rock types and reservoir spaces.It can serve as a supportive method for the fine study of carbonate reservoir characteristics.

Key words: quantification of thin section porosity, reservoir space, Leikoupo Formaiton, Majing area, Sichuan Basin

中图分类号:

TE122.2

郝哲敏,许国明,陈洪德,等. 川西坳陷马井地区中三叠统雷四³亚段储层孔隙类型与面孔率定量研究[J]. 石油与天然气地质, 2020, 41(2): 380-392, 422. doi: 10.11743/ogg20200214 Zhemin Hao,Guoming Xu,Hongde Chen,et al. Pore classification and thin section porosity quantification of reservoir in the T₂l⁴⁽³⁾ in Majing area, Western Sichuan Basin[J]. Oil & Gas Geology, 2020, 41(2): 380-392, 422. doi: 10.11743/ogg20200214

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储层段	储层岩石类型	累计厚度/m	孔隙度/%	渗透率/(10^-3μm²)
上储层段	颗粒晶粒白云岩	2.5	0.61~9.38(6)/3.47	1.01(1)
	晶粒白云岩	0.4	1.26~2.32(2)/1.79	—
	颗粒晶粒(含)白云质灰岩	6.5	1.00~3.93(6)/1.74	0.006~0.007(2)/0.007
	晶粒颗粒白云岩	0.8	0.52~1.81(9)/1.00	—
	晶粒颗粒灰岩	1.1	0.50~2.10(4)/1.58	—
下储层段	(含)灰质白云岩	9.2	1.15~7.17(13)/3.09	0.005(1)
	晶粒白云岩	5.6	2.02~7.21(9)/4.14	0.004(1)
	晶粒颗粒白云岩	22.6	1.45~8.01(38)/3.81	0.011~1.011(3)/0.345
	颗粒晶粒白云岩	15.7	1.17~4.56(17)/2.57	0.017~0.243(5)/0.057

岩石类型	储层段	平均面孔率/%	平均孔隙度/%
晶粒颗粒白云岩	上储层段	4.53(n=6)	1.00(n=9)
	下储层段	3.81(n=50)	3.81(n=38)
	上+下储层段	3.82(n=56)	3.32(n=47)
颗粒晶粒白云岩	上储层段	3.58(n=8)	3.47(n=6)
	下储层段	4.66(n=7)	2.57(n=17)
	上+下储层段	3.12(n=15)	2.91(n=23)
晶粒白云岩	上储层段	4.77(n=3)	1.79(n=2)
	下储层段	4.25(n=10)	4.14(n=9)
	上+下储层段	4.34(n=13)	3.55(n=11)
(含)白云质灰岩	上储层段	2.45(n=10)	1.74(n=6)
晶粒颗粒灰岩	上储层段	4.37(n=6)	1.58(n=4)
(含)灰质白云岩	下储层段	6.10(n=8)	3.09(n=13)

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川西坳陷马井地区中三叠统雷四³亚段储层孔隙类型与面孔率定量研究

Pore classification and thin section porosity quantification of reservoir in the T₂l⁴⁽³⁾ in Majing area, Western Sichuan Basin

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储集空间类型	沉积相类型	岩石类型
晶间(溶)孔	云坪、藻砂屑滩、藻云坪、含灰云坪、含云藻灰坪	晶粒白云岩、晶粒颗粒白云岩、颗粒晶粒白云岩、(含)灰质白云岩、晶粒颗粒(含)云质灰岩、晶粒颗粒灰岩
粒间(溶)孔	云坪、藻云坪、含灰藻云坪	晶粒颗粒白云岩、颗粒晶粒白云岩
粒内(溶)孔	藻云坪、含灰云坪、含灰藻云坪、藻砂屑滩	晶粒颗粒白云岩、颗粒晶粒白云岩、(含)灰质白云岩
铸模孔	云坪、藻云坪	晶粒颗粒白云岩、颗粒晶粒白云岩
格架孔	云坪、含灰藻云坪	晶粒白云岩、晶粒颗粒白云岩
窗格孔	云坪、含灰藻云坪	颗粒晶粒白云岩、(含)灰质白云岩
裂缝	藻灰坪、含灰云坪、含云藻灰坪、藻砂屑滩	晶粒颗粒灰岩、(含)灰质白云岩、颗粒晶粒白云岩、晶粒颗粒白云岩
溶缝	含云藻灰坪、藻灰坪、藻云坪、云坪	晶粒颗粒灰岩、(含)灰质白云岩、晶粒颗粒(含)云质灰岩、晶粒颗粒白云岩