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

Abstract

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

CLC Number:

TE122.2

Zhemin Hao, Guoming Xu, Hongde Chen, Qiongxian Wang, Ke Long, Wenkai Wang, Qiang Wang. 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.

Figures/Tables 15

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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

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

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

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

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