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Abstract

Abstract

In order to examine the mobility of hydrocarbons in a lacustrine shale oil system, three cylindrical core plugs from the Eocene Shahejie Formation lacustrine shale oil system in the Jiyang Depression were sequentially extracted with dichloromethane (DCM) in flow-through experiments under controlled stress conditions in a tri-axial flow cell ( Fig.1 ). Orientations of the three sample plugs were perpendicular to bedding (#1) and parallel to bedding (#2 and #3) ( Fig.2 ). Post-experiment Micro-CT analysis confirmed three different flow patterns: Cross bedding flow (#1), minor bedding-parallel flow (#2), and extensive bedding-parallel flow along open fractures (#3) (Fig. 3). Extraction times were 28 days, 7 days and 3 days, for samples #1, #2 and #3, respectively. Sequential series of extracts from the samples were analyzed using gas chromatography. For comparison, hydrocarbon compositions also were determined on bulk extracts of powdered original sister-sample material and the residues after flow-through experiments.

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/content/papers/10.3997/2214-4609.201902848
2019-09-01
2020-04-08
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References

  1. Mohnhoff, D., Littke, R., Krooss, B., Weniger, P.
    , 2016. Flow-through extraction of oil and gas shales under controlled stress using organic solvents: Implications for organic matter-related porosity and permeability changes with thermal maturity. Int. J. Coal Geol.157, 84–99.
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