Explanipedia

Quantifying fracture evolution characteristics of gravelly sandstones based on fractal theory Open

Kai Feng, Zhenlin Wang, Guanfang Li, Peilin Zhang, Zhichao Wang , et al. · 2025

With the advancement of unconventional oil and gas exploration and development, tight gravelly sandstone reservoirs have garnered increasing attention. In this study, triaxial compression experiments are conducted on gravelly sandstone cor…

Pore Fractal and Structure Analysis of Pore-Filling Chlorite in Continental Shales: A Case Study from the Qingshankou Formation in the Gulong Sag Open

Kang Yuan, Rukai Zhu, Kouqi Liu, Jingya Zhang, Chang Liu · 2025

The successful exploration and development of shale oil in the clay-rich Gulong shale have sparked increased research into the influence of clay minerals on shale reservoirs. However, compared to chlorite in sandstones, limited studies hav…

Evaluation of Upper Paleozoic source rocks in the southeastern margin of the Ordos Basin Open

Yongping Wan, Zhenchuan Wang, Minrui Cui, Kouqi Liu, Wu Li · 2025

Introduction The Yanchang gas field in the southeastern Ordos Basin is an important region for natural gas exploration due to the presence of Upper Paleozoic coal-bearing source rocks. This study systematically evaluates these source rocks…

Pore Structure Evolution Driven by Movable Oil in Unconventional Reservoirs: Insights from Fractal and Mineralogical Analysis Open

Hong Zhang, Kouqi Liu, Zhenlin Wang, Wenjun He, Tao Zhu , et al. · 2025

Enabling large-scale enhanced hydrogen production in deep underground coal gasification in the context of a hydrogen economy Open

Zixiang Wei, Liangliang Jiang, Aliakbar Hassanpouryouzband, Shanshan Chen, Yanpeng Chen , et al. · 2024

Detrital and authigenic clay minerals in shales: A review on their identification and applications Open

Kang Yuan, Rukai Zhu, Kouqi Liu, Jingya Zhang, Surong Zhang · 2024

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

Guoyong Liu, Yong Tang, Kouqi Liu, Z. T. Liu, Tao Zhu , et al. · 2024

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 comp…

Dynamic Change Characteristics and Main Controlling Factors of Pore Gas and Water in Tight Reservoir of Yan’an Gas Field in Ordos Basin Open

Yongping Wan, Zhenchuan Wang, Meng Wang, Xiaoyan Mu, Jie Huang , et al. · 2024

Tight sandstone gas has become an important field of natural gas development in China. The tight sandstone gas resources of Yan’an gas field in Ordos Basin have made great progress. However, due to the complex gas–water relationship, its e…

The evolution of clay mineral and its indication of hydrocarbons under overpressure: An example from the shale of the Qingshankou formation in the Gulong Sag Open

Yuan Kang, Kouqi Liu, Rukai Zhu, Yin Ge-Ge, Jingya Zhang , et al. · 2024

The enrichment and development of shale oil are significantly influenced by the evolution of clay minerals. In this paper, the mineralogy and clay mineral crystallinity of shale samples from Wells X1, X2 and X3 in the Gulong Sag are charac…

Brittle minerals, mechanical properties and fracability evaluation of shales Open

Shang Xu, Jie Wen, Kouqi Liu, Xian Feng Shi, Tian Dong · 2024

The brittleness of shales is critical to hydraulic fracturing since rock with high brittle minerals are more likely to fracture and maintain open fractures. Shale rocks have a wide range of constituting components, and different minerals d…

The role of water in the change of the fracture toughness during the ScCO2 interactions with shale samples Open

Yamin Wang, Peilin Zhang, Zhichao Wang, Kouqi Liu, Ostadhassan Mehdi · 2024

Fracture toughness is a fundamental material property that quantifies the critical loading stress necessary to overcome the resistance to mechanical fracture propagation. Herein, exposure of minerals to certain fluids can cause alterations…

Quantifying the Pore Heterogeneity of Alkaline Lake Shale during Hydrous Pyrolysis by Using the Multifractal Method Open

Yanxin Liu, Hong Zhang, Zhengchen Zhang, Luda Jing, Kouqi Liu · 2024

Distinguishing itself from marine shale formations, alkaline lake shale, as a significant hydrocarbon source rock and petroleum reservoir, exhibits distinct multifractal characteristics and evolutionary patterns. This study employs a combi…

Quantifying pore structure heterogeneity of shale samples after solvent extraction following anhydrous and hydrous pyrolysis Open

Kouqi Liu, Zhengchen Zhang, Majid Safaei-Farouji, Elham Fattahi, Hong Zhang , et al. · 2024

Heterogeneity is an important pore structure characteristic of shale formations that can impact reservoir transport properties. To better understand the heterogeneity intrinsic to the shale pore structure, gas adsorption and multifractal t…

Detailed Characterization of Pore Results of Continental Shale Reservoir in Fengcheng Formation, Mahu Sag Open

Zhengchen Zhang, Kouqi Liu, Zhenlin Wang, Feifei Luo, Hong Zhang · 2024

The exploration potential of shale oil in the Fengcheng Formation of the Mahu Sag, located in the Junggar Basin, is significant. However, there is a notable dearth of research on shale oil within this formation. This study addresses this g…

Using Fractal Theory to Study the Influence of Movable Oil on the Pore Structure of Different Types of Shale: A Case Study of the Fengcheng Formation Shale in Well X of Mahu Sag, Junggar Basin, China Open

Hong Zhang, Zhengchen Zhang, Zhenlin Wang, Yamin Wang, Rui Yang , et al. · 2024

This study investigated the influence of movable oil on the pore structure of various shale types, analyzing 19 shale samples from Well X in the Mahu Sag of the Junggar Basin. Initially, X-ray diffraction (XRD) analysis classified the shal…

An insight into mechanical properties of alkaline minerals (eitelite and shortite) deposited in Fengcheng Formation, Mahu Sag Open

Kouqi Liu, Peilin Zhang, Wenjun He, Zhenlin Wang, Ostadhassan Mehdi , et al. · 2024

Mechanical properties of minerals in shale plays would impact the design of hydraulic fracturing, a major tool to increase production from unconventional shale reservoirs. Unlike other lacustrine shale formations in China which are mainly …

Recent techniques on analyses and characterizations of shale gas and oil reservoir Open

Yamin Wang, Zhenlin Wang, Zhengchen Zhang, Shanshan Yao, Hong Zhang , et al. · 2024

This article offers a comprehensive review focused on the analysis and characterization of shale reservoirs, unconventional hydrocarbon resources that uniquely serve as both the source reservoir for gas and oil, and the rock. To analyze an…

Analysis of the Origin, Diagenesis, and Reservoir Impact of Chlorite from Multiple Perspectives: A Case Study of the Qingshankou Formation in the Songliao Basin Open

Yuan Kang, RK Zhu, Kouqi Liu, Jingya Zhang, Chang Liu , et al. · 2024

Innovative temperature-sensitive phase-transition fracturing: Boosting unconventional resource development Open

Nanlin Zhang, Liqiang Zhao, Liangliang Jiang, Yiwen Ju, Zhifeng Luo , et al. · 2024

The influence of extraction of various solvents on chemical properties on Chang 7 shale, Ordos Basin, China Open