Logging evaluation of macro-structure of continental shale oil reservoir and sweet spots selection

doi:10.3969/j.issn.1672-7703.2023.01.011

Abstract

Abstract: By considering the basic geological conditions and reservoir characteristics of typical continental shale oil reservoirs in China,such as complex lithology, diversified macro-structure types, and complex pore structure and oil bearing properties, the targeted processing of new logging technologies, including electric imaging, 2D NMR, three-component induction and array acoustic waves, are conducted to finely describe the macro- and micro-structural characteristics of shale oil reservoir, and a new method fusing micro-structure and macro-structure (referred to as “double-structure sweet spot evaluation method”) is proposed to evaluate shale oil sweet spots. The main technical connotation includes: (1) Based on image edge detection method, the processing technology of electric imaging logging and optimal selection of processing parameters are researched to evaluate the formation macro-structure. In addition, the adaptability of three macro-structural evaluation methods,namely, the electric imaging logging edge detection method, three-component induction logging electric anisotropy method, and array acoustic logging stiffness coefficient method, is systematically analyzed from three aspects of measurement principle, detection volume and wellbore environment applicability, and the optimal application method is proposed. (2) Based on the systematic comparative analysis of macrostructural shale characteristics in typical blocks, and calibrated with the fine description of core samples, the macro-structural classification standards are established by using the above three logging evaluation methods. (3) Combined with the micro-structural characteristics of reservoir physical properties, oil-bearing properties and brittleness, a favorable optimization method for shale oil sweet interval is proposed based on the macro-structural characteristics. The study results show that the main sweet intervals in the first member of Qingshankou Formation (Qing 1 member) in Gulong area in Songliao Basin, the third sub member of the seventh member of Yanchang Formation (Chang 73 sub member) in Ordos Basin, and the upper part of the Paleogene Lower Ganchaigou Formation (E32) in Yingxiongling area in Qaidam Basin are developed in laminated clay shale, thin interbedded siliceous shale, and thin interbedded lime-dolomitic shale, respectively.

CLC Number:

P631.8

Liu Guoqiang, Zhao Xianran, Yuan Chao, Li Shenzhuan, Liu Zhonghua. Logging evaluation of macro-structure of continental shale oil reservoir and sweet spots selection[J]. China Petroleum Exploration, 2023, 28(1): 120-134.

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