Distribution Patterns of Remaining Hydrocarbons Controlled by Reservoir Architecture of Distributary Channel with Different Channel Style: S2 Formation of Songliao Basin, China

Reservoir architecture analysis of distributary channel of Daqing oilfield has drawn consistent interest among development geologists and petroleum engineers over the last decade (Lv et al., 1999; Zhou et al., 2008; Zhang et al., 2013) since the theory of architectural-element analysis was proposed and developed (Allen, 1983; Miall, 1985). Numerous studies in terms of the theory of architectural-element analysis and depositional model have been carried out to characterize the distributary channel architecture which governs paths of fluid migration during oil and gas production (Gardner et al., 1992; Bridge et.al, 2000) and their study is considered pivotal for the aim of locating and recovering the remaining hydrocarbons. However, the channel style, exercising fundamental control on the geometry and heterogeneity of distributary channel (Davies et al., 1993), is relatively less taken into consideration when analyzing the reservoir architecture. Also, the remaining oil volumes within the channel have been paid much attention by geologists and petroleum engineers while those distributing in interchannel overbank sandstones have been largely overlooked. In fact, a comprehensive understanding of distribution patterns of remaining hydrocarbons controlled by reservoir internal architecture of interchannel overbank sandstones can provide considerable incremental reserves for the field life extension of Daqing oilfield. Therefore, this paper focuses first on the differences in reservoir architecture characteristics that occur between distributary channel sandstones with contrasting channel style: high sinuosity distributary channel (HSDC) and low sinuosity distributary channel (LSDC). Then this paper