Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (2): 388-397.doi: 10.13278/j.cnki.jjuese.201602108

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Geochemical Assessment of Lacustrine Tight Oil and Application

Wang Feiyu1,2, Feng Weiping1,2, Guan Jing2, He Zhiyong3   

  1. 1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102200, China;
    2. College of Geosciences, China University of Petroleum, Beijing 102200, China;
    3. Zetaware Inc, Sugar Land, TX USA 77479
  • Received:2015-07-27 Published:2016-03-26
  • Supported by:

    Supported by National Science and Technology Major Project (2008ZX05007-001) and National Natural Science Foundation of China (41372147)

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Abstract:

The three key isssues of the assessment of lacustrine tight oil or shale oil plays are:firstly, where it is (spatial distribution)? secondly, how much original oil existed in-place? and thirdly, how much oil can be produced (mobility of residual hydrocarbon). This paper discusses the geological theory and key technology to solve the forementioned three questions. The key to delineate lacustine tight oil or shale oil plays is refined as the characterization of organic-rich source rock intervals and oil sandwiche. Various source rock intervals can be identified by integrated well logging and geochemical assessment technology with SR-logR, an improved ΔlogR algorithm, and to represent the heterogeneity of lacustrine source rocks by using the positive correlation between hydrogen index IH and w(TOC). Hydrocarbon in lacustrine tight oil or shale oil plays can be splitted into two parts:free oil and adsorbed oil. The former mainly occurs in the various scale interbedded tight reservoir layers within the shale plays, and minor exists in the organic matters enriched intervals; the latter is mainly located in the organic matters enriched intervals in the shale plays. Only free oil has an economical value because the adsorbed oil cannot be produced according to the present exploitation technology. The quantitative model of free oil and adsorbed oil in source rock can be calibrated with practical geochemical data to calulate the amount of free oil, adsorbed oil, and original oil in-place. The recovery ratio of tight oil or shale oil depends on the hydrocarbon mobility, which is controlled by maturity or hydrocarbon conversion rates. Hydrogen index of organic-rich source rocks (w(TOC) more than 2%) and the modified models are recommended to refine maturity or conversion rate. A case study from Biyang basin has been provided to show how to predict hydrocarbon mobility trend from hydrocarbon generation model and practical Rock-Eval data.

Key words: tight oil, shale oil, free oil, adsorbed oil, mobility, Biyang basin, geochemical

CLC Number: 

  • P618.13

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