How CO2 storage mechanisms are different in organic shale: Characterization and simulation studies

Hui Pu, Yuhe Wang, Yinghui Li

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Widely-distributed organic-rich shales are being considered as one of the important carbon sequestration targets owing to three differentiators compared with conventional reservoirs and saline aquifers: 1) trapping of significant amount of CO2 permanently; 2) kerogen-rich shale's higher affinity of CO2; 3) existing infrastructure of wells and pipelines, etc. makes CO2 storage in organic-rich shales attractive because shale formations in US are in the vicinity of existing power or chemical plants. As a result, there are large savings for infrastructure and inventory, e.g., CO2 purification facility and pipelines, for plant operators as compared with carbon capture, utilization and storage (CCUS) in depleted conventional reservoirs or saline aquifers. The incapability to model capillarity with the consideration of imperative pore size distribution (PSD) characteristics using commercial software may lead to inaccurate results for CCUS. We developed a novel algorithm to examine how PSD would alter phase and flow behavior under nano-pore confinements. The assumptions in Langmuir isotherm in commercial software are not held for liquid-rich shale, and CO2 storage purpose in particular. Our adsorption model incorporates adsorption behavior using a local density optimization algorithm and is designed for multi-component interactions to adsorption sites for a full spectrum of reservoir pressures of interests. This feature allowed us to fully understand the storage and sieving capabilities for CO2/N2 flue gas system with remaining reservoir fluids.

Original languageEnglish
Title of host publicationSociety of Petroleum Engineers - SPE Europec Featured at 78th EAGE Conference and Exhibition
PublisherSociety of Petroleum Engineers
ISBN (Electronic)9781613994573
Publication statusPublished - 2016
EventSPE Europec Featured at 78th EAGE Conference and Exhibition - Vienna, Austria
Duration: 30 May 20162 Jun 2016

Other

OtherSPE Europec Featured at 78th EAGE Conference and Exhibition
CountryAustria
CityVienna
Period30/5/162/6/16

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ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Fuel Technology
  • Geochemistry and Petrology

Cite this

Pu, H., Wang, Y., & Li, Y. (2016). How CO2 storage mechanisms are different in organic shale: Characterization and simulation studies. In Society of Petroleum Engineers - SPE Europec Featured at 78th EAGE Conference and Exhibition Society of Petroleum Engineers.