Seismic prediction of sandstone diagenetic facies: Applied to Cretaceous Qingshankou Formation in Qijia Depression, Songliao Basin, East China

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

“…For years, research on diagenetic reservoir facies has been confined primarily to core and microscopic thin-section analyses (Zeng et al, 2013). Diagenetic variations have not been previously correlated with core petrophysics and well-log response (Ozkan et al, 2011).…”

“…However, research on diagenetic facies has been confined primarily to core and microscopic thin-section analyses (Zeng et al, 2013), and diagenetic variations have not been previously correlated with well-log responses (Ozkan et al, 2011). However, the diagenetic facies can be defined by a set of log responses, by translating diagenetic facies to well log responses, and the generated model could be used to predict the likely diagenetic facies and reservoir property of intervals that lack core control with the same or similar log responses, or even in nearby wells in a given field.…”

Methods for seismic sedimentology research on continental basins

“…It is well recognized by researchers in China that the seismic sedimentology method originally used for marine basins can provide useful guidance for studying the sedimentation of continental basins in this country (Zhao et al 2011;Huang et al 2011;Dong et al 2011;Zeng et al 2013). However, compared to marine basins, continental basins in China are quite different in their major control factors and petrophysical and seismic reflection features (Gu et al 2005;Zeng et al 2012) (Table 1), resulting in difficulties in seismic sedimentology interpretation due to the following characteristics: (1) complex depositional systems, various sedimentation types, and rapid changes in sedimentary facies within a small range; due to the filtering effect of wavelets, sands of different sedimentary types are similar in their geophysical responses, which is not only shown in seismic reflection but also on seismic slices, so a seismic sedimentology methodology for sands of different sedimentary types is still lacking; (2) thin and poor lateral continuity of sand bodies; seismic sedimentology investigates the sedimentary features and evolutionary pattern of deposition, but due to the effects of different deposition velocities in different parts of the basin, seismic slices for thin sands are prone to diachroneity; and (3) complex lithology-wave impedance relations; in contrast to marine basins, continental basins in China are much more complex in their lithological distribution (in many cases, conglomerate, sandstone, mudstone, limestone, and coal coexist) and multi-polar in wave impedance, making it difficult to calibrate the lithology on the 90°phase seismic profile and resulting in multiple possible interpretations of the lithology based on seismic data.…”

Depositional environments and petrofacies of X–XII sand groups of K2 qn 3 Formation, Daqingzijing area, Songliao Basin, China

“…Macroscopically, it controls the geometry and spatial distribution of a reservoir sand body (Zhang et al 2010;Li et al 2013), and microscopically, it controls the different physical properties and heterogeneity of a reservoir (Liu et al 2014;Zeng et al 2013). Therefore, sedimentary petrofacies have always been the focus of attention and a hot issue in the research field of reservoir sedimentology (Zhang et al 2009;Cao et al 2010).…”