Molecular and isotopic evidence for mixed-source oils in subtle petroleum traps of the Dongying South Slope, Bohai Bay Basin

Relative role of accommodation zones in controlling stratal architectural variability and facies distribution: Insights from the Fushan Depression, South China Sea

“…Based on major parallel unconformities, the Palaeogene unit of the Fushan Depression is divided into three formations: the Changliu Formation (SQEch) of Early Eocene age, the Liushagang Formation (SQEls) of Middle to Late Eocene age, the Weizhou Formation (SQEwz) of Oligocene age (Fig.3) (Li et al, 2010;Liu et al, 2012;Liu et al, 2014). Using the sequence stratigraphic principles of Vail (1977), in combination with modern sedimentology techniques and sequence stratigraphic data (e.g.…”

“…impeded hydrocarbon exploration efforts in this region of the Fushan Depression (Li et al, 2007;Luo and Pang, 2008;Li et al, 2010). During the late rifting period (38 to 23 Ma), SQEls1 was deposited as large-scale braided river deltas again (Li et al, 2010;Liu et al, 2012).…”

“…During the late rifting period (38 to 23 Ma), SQEls1 was deposited as large-scale braided river deltas again (Li et al, 2010;Liu et al, 2012). From the late Eocene to the early Oligocene, the southern slope area was exposed, and underwent significant denudation.…”

“…From the late Eocene to the early Oligocene, the southern slope area was exposed, and underwent significant denudation. The overall tectonic activity became weaker during the Oligocene, and the Weizhou Formation was deposited, mainly comprising fluvial facies intercalated with shallow marine deposits (Li et al, 2010;Liu et al, 2012).…”

“…Further, it has been documented that the accommodation zone, being close to both the Bailian Sag and the Huangtong Sag, was supplied with high-quality hydrocarbons from both sags (Li et al, 2007;Li et al, 2010).…”