Coupling relationship between sandstone reservoir densification and hydrocarbon accumulation: A case from the Yanchang Formation of the Xifeng and Ansai areas, Ordos Basin

The coupling of dynamics and permeability in the hydrocarbon accumulation period controls the oil-bearing potential of low permeability reservoirs: a case study of the low permeability turbidite reservoirs in the middle part of the third member of Shahejie Formation in Dongying Sag

“…8i, k) as also described by Girard et al (2002) and Higgs et al (2007). The color of those organic materials is orange to yellow in fluorescence microscopy which reflects the low maturity of hydrocarbon (Liu et al 2014c;Chen 2014). It can be inferred that the first phase of quartz overgrowths formed after the early period hydrocarbon filling.…”

Tight oil sandstones in Upper Triassic Yanchang Formation, Ordos Basin, N. China: Reservoir quality destruction in a closed diagenetic system

“…Lake basin development peaked during the deposition of Chang 7 Member and simultaneously peaked in the development of Mesozoic hydrocarbon source rocks with an average total organic carbon (TOC) of 13.75% and a vitrinite reflectance (Ro) in the range of 0.85–1.15% (Yang & Zhang, ; Zhang, Yang, Li, & Ma, ). The overlying Chang 6 Member and underlying Chang 8 Member are the main reservoir beds of Yanchang Formation tight sandstone hydrocarbon reservoirs (Liu et al, ; Zhang, Yang, Hou, & Liu, ). This study focused on the Chang 8 Member of Xifeng Area, in which oil is mainly accumulated in the sandstones of shallow lacustrine delta distributary channel (Zhou et al, ).…”

“…Member and underlying Chang 8 Member are the main reservoir beds of Yanchang Formation tight sandstone hydrocarbon reservoirs (Liu et al, 2014;Zhang, Yang, Hou, & Liu, 2009). This study focused on the Chang 8 Member of Xifeng Area, in which oil is mainly accumulated in the sandstones of shallow lacustrine delta distributary channel .…”

“…As one of the most important unconventional hydrocarbon resources, the tight sandstones have been found widely distributed in the petroliferous basins of the world in recent decades (Higgs et al, ; Schmitt et al, ; Spencer, ), especially in China, such as the Ordos Basin, Sichuan Basin, Bohai Bay Basin, and Songliao Basin (Liu et al, ; Liu, Liu, Wu, Zhu, & Wang, ; Xi et al, ; Zou et al, ). Generally, a tight sandstone is defined as a sandstone with porosity lower than 10% and the air permeability lower than 1 mD (Law & Curtis, ; Spencer, ; Stroker, Harris, Crawford Elliott, & Marion Wampler, ; Xi et al, ; Zou, Zhu, et al, ).…”

Factors influencing physical property evolution in sandstone mechanical compaction: the evidence from diagenetic simulation experiments

“…Mechanical compaction, as one of the major destructive aspects of diagenesis, can cause dramatic changes in sandstone pore structure and distribution. It results in a substantial reduction of pore space, which is the main factor that damages reservoirs and forms low porosity, low permeability reservoirs (Zhu et al 2008;Chester et al 2004;Zhu et al 2013;Lv and Liu 2009;Maast et al 2011;Taylor et al 2010;Ajdukiewicz et al 2010;Zhang et al 2008;Wang et al 2015;Zhang et al 2014;Liu et al 2014 compaction is influenced by a combination of various factors such as burial depth, sediment composition, particle size, sorting, abnormally high pressure, and burial time (Liu et al 2007;Aplin et al 2006). However, current studies about various factors influencing compaction mainly focus on simple and qualitative description, and little work has been done on quantitative analysis based on simulation experiments, leading to the vague understanding of the evolution of physical properties and influencing mechanisms of various factors during mechanical compaction processes.…”