首页|Impact of secondary geomorphic processes on sedimentary characteristics of alluvial fans: Implications for reservoir exploration and development
Impact of secondary geomorphic processes on sedimentary characteristics of alluvial fans: Implications for reservoir exploration and development
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
NETL
NSTL
Elsevier
Alluvial fans, typically characterized by a mixture of fine-and coarse-grained materials, high heterogeneity, and weakly structured organization, are formed through various depositional processes. Fan deposits are considered valuable reservoir exploration targets in the hydrocarbon field worldwide. A series of Quaternary fans in northwestern and northern China, subjected to secondary geomorphological processes of varying degrees, were analyzed. Primary geomorphic processes, characterized by lobe or sheet elements of debris flow, hyper-concentrated flow and sheet floods deposits, generally represent rapid fan aggradation and dominate the sedimentary succession of these fans. Deposition of secondary processes is mainly developed by streamflows reworking with identifiable features, such as sheet-like lag, braided/point bar, and channel elements. A lack of sediment input to the fan and the redistribution and remodification of the primary deposits characterize this process. Synsedimentary reservoir quality is significantly improved by reorganizing sorting, support styles, and bedding structures. The proportion of primary and secondary architectural elements is proposed to evaluate the relative intensity of secondary processes experienced by alluvial fans. The dominant drivers of strong secondary processes are attributed to frequent streamflow events in response to climate changes on millennial timescales. Physical properties and connectivity of alluvial fan reservoirs related to secondary processes are commonly improved compared to reservoirs directly originating from primary processes, as a deep-time example from the Karamay oilfield. The results of this study provide new insights into constructing alluvial fan models in deep-time terrestrial basins and contribute to predicting favorable reservoir distribution and adjusting development strategies for alluvial fan reservoirs worldwide.
NETL
NSTL
Elsevier
