Study on Flow Units and Residual Oil Distribution of Lower S₂ Formation in Wen-X Fault Block, Wenliu Oilfield

Abstract

Flow units are divided into E,G and P types for the Lower S2reservoir of Wen-X fault block in the Wenliu Oilfield, which are identificated based on six parameters including porosity, permeability, sandstone thickness, effective thickness, formation conductivity and flow index. A 3-D model for the flow units is established by sequential gaussian stochastic simulation approach. It is believed that type- E flow units are well exploited, with the distribution of the remaining oils related to fault as a barrier；type-G flow units are less exploited, with enrichment of remaining oil, due to the influence of interlayer or lateral heterogeneity；and type-P flow units are difficult to be exploited because of the poor percolation and a lower reserves abundance

Simulation analysis of the mechanism and influencing factors of remaining oil secondary enrichment in ultra-high water cut fault block reservoirs

“…At present, research on enriched remaining oil mainly focuses on the distribution characteristics and influencing factors of enriched remaining oil after displacement (Xia et al, 2010, 2021; Tang et al, 2012; Fang et al, 2019; Wang et al, 2020; Zhao, 2021; Jiang et al, 2022), the recovery method of enriched remaining oil (Chen et al, 2013; Liu et al, 2022), and the remaining oil storage mechanism (Dai and Lin, 2020; Song et al, 2020; Wolf et al, 2020). Wang and Ye (2013) studied the distribution law of remaining oil after polymer flooding and proposed five remaining oil enrichment areas after polymer flooding.…”