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Title: Geochemical characteristics and identification criteria of effective source rock in Mesozoic Yanchang Formation, southern margin of Ordos Basin

Authors: Ying Wu; Jingong Zhang

Addresses: Department of Geology, Northwest University, Shaanxi Xi'an 710069, China ' Department of Geology, Northwest University, Shaanxi Xi'an 710069, China

Abstract: The geochemical characteristics of source rock in Mesozoic Yanchang Formation, southern margin of Ordos Basin have not been introduced in literature. In this study, a number of geochemical experiments were conducted to discuss the geochemical characteristics and to establish the identification criteria. It is shown that source rock in the study area can be divided into five types: A1, A2, A3, A4 and B. Based on the detailed oil source correlation, the source rock types in the study area can be identified as: 1) A1, Chang 7 oil shale, is the excellent source rock with large hydrocarbon-generation potential; 2) A2 and A3, mainly Chang 7 dark mudstone, are the effective source rocks with medium hydrocarbon-generation potential; 3) A4 and B, mainly the thin mudstone or carbonaceous mudstone intervals, are the potential source rock with small hydrocarbon-generation potential. [Received: April 22, 2018; Accepted: May 27, 2018]

Keywords: southern margin of Ordos Basin; biomarker; geochemical characteristics; oil source correlation; effective source rock; potential source rock; identification criteria.

DOI: 10.1504/IJOGCT.2018.095999

International Journal of Oil, Gas and Coal Technology, 2018 Vol.19 No.4, pp.379 - 395

Received: 22 Apr 2018
Accepted: 27 May 2018
Published online: 06 Nov 2018 *