Comparison of Pore Structure Characteristics of Shale-Oil and Tight-Oil Reservoirs in the Fengcheng Formation in Mahu Sag

Guoyong Liu, Yong Tang (), Kouqi Liu, Zuoqiang Liu, Tao Zhu, Yang Zou, Xinlong Liu, Sen Yang and An Xie
Additional contact information
Guoyong Liu: PetroChina Qinghai Oilfield Company, Dunhuang 736200, China
Yong Tang: Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, China
Kouqi Liu: Institute of Energy, Peking University, Beijing 100871, China
Zuoqiang Liu: Research Institute of BGP Inc., China National Petroleum Corporation, Zhuozhou 072751, China
Tao Zhu: Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, China
Yang Zou: Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, China
Xinlong Liu: Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, China
Sen Yang: Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, China
An Xie: Xinjiang Research Institute of Huairou Laboratory, Urumqi 830000, China

Energies, 2024, vol. 17, issue 16, 1-19

Abstract: Despite the abundance of shale-oil and tight-oil reserves in the Fengcheng Formation within the Mahu Sag, exploration and development efforts for both types of reservoir are still in their early stages. A comprehensive examination and comparison of the pore structures of these reservoirs can establish rational classification and evaluation criteria. However, there is a dearth of comparative analyses focusing on the pore structures of shale-oil and tight-oil reservoirs within the Fengcheng Formation. This study addresses this gap by systematically analyzing and comparing the pore structures of these reservoirs using various techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), low-temperature nitrogen adsorption, and mercury intrusion capillary pressure experiments (MICP). The results show that the shale oil within the Fengcheng Formation exhibits a higher content of carbonic acid compared to the tight-oil samples. Furthermore, it demonstrates smaller displacement pressure and median pressure, a larger sorting coefficient, and superior permeability in contrast to tight oil. Notably, the shale oil within the Fengcheng Formation is characterized by abundant striated layer structures and micro-fractures, which significantly contribute to the microstructural disparities between shale-oil and tight-oil reservoirs. These differences in microstructures between shale oil and tight oil within the Fengcheng Formation in the Mahu Sag region delineate distinct criteria for evaluating sweet spots in shale-oil and tight-oil reservoirs.

Keywords: Mahu Sag; Fengcheng Formation; tight oil; shale oil; pore structure (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: 2024
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/17/16/4027/pdf (application/pdf)
https://www.mdpi.com/1996-1073/17/16/4027/ (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:17:y:2024:i:16:p:4027-:d:1456096

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 ().