Natural Gas Geoscience ›› 2022, Vol. 33 ›› Issue (3): 396-407.doi: 10.11764/j.issn.1672-1926.2021.07.002

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Reservoir characteristics and its influence on transitional shale: An example from Permian Shanxi Formation shale, Daning-Jixian blocks, Ordos Basin

Qin ZHANG1,2(),Zhen QIU1,2(),Leifu ZHANG1,2,Yuman WANG1,2,Yufeng XIAO1,2,Dan LIU1,2,Wen LIU1,2,Shuxin LI3,Xingtao LI3   

  1. 1.PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China
    2.China National Energy Shale Gas Research (Experiment) Center,Langfang 065007,China
    3.PetroChina Coalbed Methane Company,Beijing 100028,China
  • Received:2021-04-28 Revised:2021-07-04 Online:2022-03-10 Published:2022-03-22
  • Contact: Zhen QIU E-mail:zhangqin2169@petrochina.com.cn;qiuzhen316@163.com
  • Supported by:
    The Scientific Research and Technological Development Programs of RIPED(2021yjcq02);the 14th Five-Year Prospective Basic Project of CNPC(2021DJ2001)

Abstract:

The shales in the 2nd member of Shanxi Formation in the Daning-Jixian blocks, east margin of the Ordos Basin were deposited in a marine-continental transitional environment during the Permian. The Shan23 sub-member is characterized by large thickness, few and thin interlayers, which is the key target for transitional shale gas exploration and development. However, there are relatively few related studies on the reservoir characteristics, especially the main controlling factors for the development of the high quality reservoirs need to be further clarified. In this paper, the reservoir characteristics of Shan23 sub-member in Daning-Jixian blocks are systematically studied and the main controlling factors of high quality reservoir development are discussed by using geochemical analysis, compositional analysis and microscopic characterization method. The results indicate that the lower section of the upper lagoon facies in the Shan23 sub-member has the characteristics of high TOC content, high brittle mineral content, high values of BET and BJH, which is the sweet spot for shale gas exploration and development. Pores developed in clay minerals and in organic matter contribute most to the porosity of the Shan23 sub-member, accounting for 76.9% and 18.7% of the total porosity respectively. SEM observation (resolution>6 nm) discloses that different components in shale have great difference in pore size distribution, and the pores developed in organic matter and calcite are mainly in meso-scale. The pore size distribution characteristics of clay minerals are similar with quartz pores where pores developed both in meso and macro scale. The pores developed in feldspar and pyrite distribute in a wide range and the distribution is relatively uniform. Single factor analysis shows that the content of the clay minerals is the dominant controlling factor for pore development in the Shan23 sub-member. The organic matter content has a certain effect on the pore development of shale, but the influence of the organic matter type on the pore development is not obvious.

Key words: Transitional facies, Shale gas, Permian Shanxi Formation, Reservoir characteristics

CLC Number: 

  • TE122.2

Fig.1

Structural map of Daning-Jixian blocks in Ordos Basin[21](a) and stratigraphic column(b) of 2nd member of Shanxi Formation"

Fig.2

TOC content and mineral compositions of shale reservoir in the Shan23 sub-member of Well Daji 3-4(the data from Ref.[26])"

Fig.3

Column diagram of the main mineral composition distribution in different sedimentary facies"

Fig.4

Porosity percentage taking by major components of shale in the Shan23 sub-member"

Fig.5

BET, BJH and pore size distribution of different sedimentary microfacies in the Shan23 sub-member"

Fig.6

Full scale pore size distribution of the transitional shale(data form Ref.[26])"

Fig.7

Typical pores developed in different minerals"

Fig.8

Pore size distribution of different components observed by SEM Images"

Fig.9

Relationships between major components and porosity in the Shan23 sub-member"

Fig.10

Relationships between BJH and major components in the Shan23 sub-member"

Fig. 11

BET and BJH distribution among shale samples with similar clay minerals but different kerogen types"

Fig.12

Characteristics of organic pores in shale samples with different kerogen types in the Shan23 sub-member"

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