Injected Sand Sills in a Strike-slip Fault Zone: A Case Study from the Pil´sk Suite (Miocene), Southeast Schmidt Peninsula, Sakhalin
Published:January 01, 2007
David Macdonald, Rachel Flecker, 2007. "Injected Sand Sills in a Strike-slip Fault Zone: A Case Study from the Pil´sk Suite (Miocene), Southeast Schmidt Peninsula, Sakhalin", Sand Injectites: Implications for Hydrocarbon Exploration and Production, Andrew Hurst, Joseph Cartwright
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This chapter describes sandstone sills intruded into the middle Miocene Pil´sk Suite, which are well exposed along a continuously exposed 8-km (5-mi) section on the southeast coast of Schmidt Peninsula, Sakhalin (Russian Far East). This suite forms part of a relatively thin Neogene succession (probably no more than 1100 m thick [3608 ft]), which unconformably overlies Cretaceous deposits. The succession was deposited on a topographic high, which marks the Mesozoic outer arc high and is now deformed within a large-scale dextral strike-slip fault system, part of the Eurasia- North America plate boundary. The Pil´sk Suite is dominated by organic-rich...
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Sand Injectites: Implications for Hydrocarbon Exploration and Production
Sand injectites are described in scientific literature as an increasingly common occurrence in hydrocarbon reservoirs, in particular in deep-water clastic systems, where they are known to influence reserves distribution and recovery. Seismically-detectable injected sand bodies constitute targets for exploration and development wells and, subseismic sand bodies provide excellent intra-reservoir flow units that create field-wide vertical communication through depositionally extensive, low-permeability units. As sand injectites form permeable conduits in otherwise low-permeability units they facilitate the expulsion of basinal fluids; hence they act both as a seal risk and mitigate timing and rate of hydrocarbon migration. Injected sand bodies form intrusive traps, which are distinct from structural or stratigraphic traps. Included in this publication are 10 chapters on subsurface examination of sand injectites, 1 chapter on theoretical considerations, and 13 outcrop analogs in reservoirs across the world. Captured in this volume is at least a taste of the global and stratigraphic distribution of sand injectites, and an attempt to introduce readers to sand injectites and their significance in the context of hydrocarbon exploration and production. The book is not intended as a complete review of the field-based literature, but emphasizes high quality case studies from the surface and subsurface. The geographic scope of the book is large, and illustrates the diversity of geological settings in which these fascinating and economically significant features are found.