Characteristics of marinecontinental transitional organicrich shale in the Ordos Basin and its shale gas significance.

doi:10.13745/j.esf.2015.06.015

Earth Science Frontiers ›› 2015, Vol. 22 ›› Issue (6): 197-206.DOI: 10.13745/j.esf.2015.06.015

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Characteristics of marinecontinental transitional organicrich shale in the Ordos Basin and its shale gas significance.

1. School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China
2. MOE Key Laboratory for Marine Reservoir Evolution and Hydrocarbon Abundance Mechanism, China University of Geosciences (Beijing); MLR Key Laboratory for Shale Gas Exploitation and Assessment, China University of Geosciences (Beijing), Beijing 100083, China

Received:2014-03-14 Revised:2014-05-26 Online:2015-11-15 Published:2015-11-25

Abstract

Abstract:

In this study, the CP marinecontinental transitional organicrich shale in the Ordos Basin was investigated by means of rock pyrolysis analysis, rock extraction and group analysis, organic element analysis and coal optical analysis to test the geochemical parameters, such as organic matter type, abundance, maturity and hydrocarbon generation potential. Utilizing SEM, XRD and physical property measurement, the mineral composition and the characteristics of porosity and permeability have been analyzed. The results proved that the marinecontinental transitional organicrich shale in the Ordos Basin distributes widely and has the characteristics of diminutive individual thickness but huge cumulative thickness. The content of TOC is about 2.5%, organic matter type is mainly Ⅲ, and RO is about 1.2%. Hydrocarbon potential(S1+S2) is at the stage of massive gas generation. Percentage of quartz and feldspar is high, various porosity and crack type could be found, and preservation of shale reservoir is well. All of these conditions provide the favorable environment of shale gas formation.

Key words: marinecontinental transitional shale, kerogen infrared spectrum, chloroform bitumen “A”, hydrocarbon generation potential, Ordos Basin

CLC Number:

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Characteristics of marinecontinental transitional organicrich shale in the Ordos Basin and its shale gas significance.

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