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Natural Gas Geoscience ›› 2022, Vol. 33 ›› Issue (4): 572-587.doi: 10.11764/j.issn.1672-1926.2021.11.001

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Sedimentary evolution and its influence on karst reservoir development of the Middle Permian Maokou Formation in the northwestern Sichuan Basin， China

Xin HU1(),Yufeng WANG1,Senqi PEI1,Qi ZENG1,Rongrong LI1,Hongyu LONG1,Tanglü LI1,Siyu ZHOU2,Haitao SUN2()   

  1. 1.Northwest Sichuan Gas Field，Southwest Oil and Gasfield Company，PetroChina，Jiangyou 621700，China
    2.College of Geosciences，China University of Petroleum?Beijing，Beijing 102249，China
  • Received:2021-04-13 Revised:2021-11-05 Online:2022-04-10 Published:2022-04-22
  • Contact: Haitao SUN E-mail:hz0607@petrochina.com.cn;haitao.sun@cup.edu.cn
  • Supported by:
    The National Natural Science Foundation of China(41972097);the Science and Technology Project of PetroChina Southwest Oil and Gasfield Company(20220301-03-05)

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Abstract:

The Middle Permian Maokou Formation in northwest Sichuan Basin is mainly composed of limestone， which is deeply buried and has poor physical properties. It is a kind of low porosity and low permeability reservoir， with some good area of natural gas exploration. In order to clarify the sedimentary characteristics of the ultra-deep reservoir of the Maokou Formation， this paper analyzes the reservoir rock lithology types and its distribution， sedimentary facies and its controlling to the favorable reservoir by using drilling， logging and seismic data， and further discusses the controlling factors on high-quality reservoir development. The results show that during the first and the second members of Maokou Formation in Northwest Sichuan， bioclastic beach of the platform margin was developed in the Zhongba-Shuangyushi areas， and open platform in the other areas. The bioclastic beach of open platform was developed in the Jiulongshan area. The sedimentary pattern changed greatly during the third member of Maokou Formation， the relative sea level raised in Kuangshanliang-Jiulongshan areas， and developed the basin-slope facies with silicalite of biochemical origin. So， there was a new platform margin which was formed in the area from Shuangyushi to Jiange. This study found the change of sedimentary pattern of the Middle Permian Maokou Formation in the northwestern Sichuan Basin， and it is found that the differences of sedimentary facies and lithology of the Maokou Formation in Shuangyushi area and Jiulongshan area affected the karstification mode of those two areas， which can guide the exploration of favorable reservoirs.

Key words: Sichuan Basin, Maokou Formation, Carbonate platform, Karst reservoir, Silicalite

CLC Number: 

  • TE121.3+1

Fig.1

Location map（a） of the well and faults in the northwestern Sichuan Basin and the lithology column（b） of Middle Permian"

Fig.2

Lithology and its petrographic characteristics of the Maokou Formation in the northwestern Sichuan Basin"

Fig.3

Genetic discrimination map of silicon rock of the Maokou Formation in the northwestern Sichuan Basin （after ADACHI，et al.［19］， KAWABE，et al.［20］）"

Fig.4

Lithology group characteristics of different members of the Maokou Formation in the northwestern Sichuan Basin"

Fig.5

Well correlation profile of the Maokou Formation facies in the northwestern Sichuan Basin"

Fig.6

Petrographic characteristics of the different sedimentary facies in the Maokou Formation of the northwestern Sichuan Basin"

Fig.7

Sedimentary facies of single Well K2 of Maokou Formation in the northwestern Sichuan Basin"

Fig.8

Single factor contour map of each section of Maokou Formation in the northwestern Sichuan Basin"

Fig.9

Sedimentary evolution distribution of each member of Maokou Formation in the northwestern Sichuan Basin"

Fig.10

Strata variation of the seismic profile crossing the wells YB7， LT1 and L17"

Fig.11

Porosity histograms of different sedimentary facies in different wells of the Shuangyushi area"

Fig.12

Reservoir characteristics of well logging data in the Maokou Formation of Well L16"

Fig.13

Homogenization temperature histogram of inclusions in fracture fillings of Maokou Formation in Jiulongshan area"

Fig.14

Thickness contour map of Wangpo shale at the top of Maokou Formation in the northwest Sichuan Basin"

Fig.15

Seismic attribute slice of Maokou Formation in Shuangyushi area"

Fig.16

Seismic attribute slices of Maokou Formation in Jiulongshan area"

Fig.17

Sketch map shows the karst reservoir origin of the Maokou Formation in the northwestern Sichuan Basin"

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