Pore classification and thin section porosity quantification of reservoir in the T<sub>2</sub><italic style="font-style: italic">l</italic><sup>4(3)</sup> in Majing area, Western Sichuan Basin

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

doi:10.11743/ogg20200214

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Pore classification and thin section porosity quantification of reservoir in the T₂l⁴⁽³⁾ in Majing area, Western Sichuan Basin
Vol. 41, Issue 2, Pages: 380-392, 422(2020)
Received：07 July 2019，

Published：28 April 2020
DOI： 10.11743/ogg20200214
稿件说明：

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DOI：

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. DOI：

摘要

为了研究川西坳陷马井地区中三叠统雷口坡组雷四

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

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

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

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。

Abstract

Quantitative analysis of the characteristics and porosity of the reservoir in the third interval of the 4th member of Middle Triassic Leikoupo Formation (T

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 T

4-3

while grained crystalline dolomite and crystalline granular dolomite dominate in the reservoir of the lower section of T

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.

关键词

Keywords

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