Division of diagenesis reservoir facies and its control — Case study of Chang-3 reservoir in Yangchang formation of Fuxian exploration area in northern Shaanxi

Diagenesis and reservoir quality of Pannonian lacustrine deposits in the Makó Trough, SE Hungary

“…Porosity loss, due to compaction of ductile grains and carbonate cementation was reported (Liu et al, 2015) from Carboniferous sandstone deposited in barrier bartidal flat-lagoon environment in the Ordos Basin. Porosity enhancement by dissolution, which resulted in secondary porosity, was reported by Fu et al (2009) from Triassic sandstones from the south-eastern margin of the Ordos Basin. That sandstone were deposited in delta lake system and eogenetic laumontite was the pahse which was dissolved in late diagenesis.…”

“…In case of tight gas sandstones, diagenetic facies is often used for characterization of reservoir quality (Fu et al, 2009;Lai et al, 2018). This concept is based on the determination of distribution of various diagenetic reactions and their impact in porosity and permeability evolution.…”

Prediction of Diagenetic Facies using Well Logs: Evidences from Upper Triassic Yanchang Formation Chang 8 Sandstones in Jiyuan Region, Ordos Basin, China

“…For specific sedimentary microfacies, diagenetic facies, together with diagenetic minerals assemblages, decide the formation and distribution of high quality reservoirs in tight sandstones (Lai et al, 2013a). Research of diagenetic facies is helpful for comprehensive evaluation and "sweet spot" prediction of reservoirs (Fu et al, 2009;Lai et al, 2013a).…”

“…Various diagenetic facies combinations result in different porosity characteristics and physical properties of reservoirs (Fu et al, 2009). Porosity and permeability ranges for each diagenetic facies were determined from core analyses.…”

Diagenetic facies characteristics and quantitative prediction via wireline logs based on machine learning: A case of Lianggaoshan tight sandstone, fuling area, Southeastern Sichuan Basin, Southwest China

“…Diagenesis refers to the physical and chemical processes of clastic rocks that occur between sedimentation and metamorphism (De Segonzac, 1968;Zhang et al, 2015;Zhang et al, 2017;Khan et al, 2018;Quasim et al, 2021), which usually includes compaction, cementation, and dissolution (Bjørlykke and Jahren, 2012;Kassab et al, 2014;Zhang et al, 2017;Khanam et al, 2021). Diagenetic facies are used to describe diagenetic heterogeneity in sandstone reservoirs (Grigsby and Langford, 1996), and to predict high-quality reservoirs and their genesis in tight sandstone (Zou et al, 2008;Fu et al, 2009;Ozkan et al, 2011;Liu et al, 2015;Lai et al, 2016;Cui et al, 2017). The definition and classification of diagenetic facies require the composition of diagenetic minerals, the composition and texture of rocks, and scanning electron microscopy (SEM) and X-ray diffraction analysis (XRD), all of which have been analyzed based on the core (Mou and Brenner, 1982;Zou et al, 2008;Liu et al, 2015;Lai et al, 2016;Cui et al, 2017).…”