Pore Structure Characteristics and Influencing Factors of Tight Reservoirs Controlled by Different Provenance Systems: A Case Study of the Chang 7 Members in Heshui and Xin’anbian of the Ordos Basin

Ling Xiao, Ling Bi, Tao Yi, Yutian Lei and Qinlian Wei ()
Additional contact information
Ling Xiao: School of Earth Science and Engineering, Xi’an Shiyou University, No.18 2th Dianzi Road, Yanta District, Xi’an 710065, China
Ling Bi: School of Earth Science and Engineering, Xi’an Shiyou University, No.18 2th Dianzi Road, Yanta District, Xi’an 710065, China
Tao Yi: No. 12 Oil Production Plant, PetroChina Changqing Oilfield Company, Heshui, Qingyang 745400, China
Yutian Lei: No. 12 Oil Production Plant, PetroChina Changqing Oilfield Company, Heshui, Qingyang 745400, China
Qinlian Wei: School of Earth Science and Engineering, Xi’an Shiyou University, No.18 2th Dianzi Road, Yanta District, Xi’an 710065, China

Energies, 2023, vol. 16, issue 8, 1-18

Abstract: The evaluation of pore structure is critical in understanding reservoir characteristics. This study aims to analyze the microscopic pore structure characteristics of tight reservoirs from various provenances through physical property analysis, casting thin sections, scanning electron microscopy (SEM), and constant−rate mercury injection. The pore throat parameters of the Chang 7 reservoir were analyzed and compared to those of the Xin’anbian and the Heshui areas. The results show that intergranular pores dominate the pore type of the Chang 7 reservoir in the Xin’anbian area, followed by feldspathic dissolution pores, with high-necked and tubular throat content caused by weak compaction and dissolution, respectively. On the other hand, feldspar dissolution pores dominate the pore type of the Chang 7 reservoir in the Heshui area, followed by intergranular pores, with a high content of tube−bundle throats caused by dissolution and flake−bent flake throats caused by compaction. The difference in pore parameters between the two blocks is minimal, but the difference in throat parameters is significant. Under the same permeability conditions, the throat radius distribution range of the Chang 7 reservoir samples in the Heshui area is narrower than that in the Xin’anbian area, with tiny throats contributing significantly to reservoir permeability. Sedimentary hydrodynamic conditions and diagenesis are the primary reasons for the differences in the pores, throats, and pore structure parameters of the Chang 7 tight reservoirs.

Keywords: pore type; pore throat parameter; pore structure; tight reservoir; Ordos Basin (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/16/8/3410/pdf (application/pdf)
https://www.mdpi.com/1996-1073/16/8/3410/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:16:y:2023:i:8:p:3410-:d:1122256

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().