Laminar structure of typical continental shales and reservoir quality evaluation in central-western basins in China

doi:10.3969/j.issn.1672-7703.2022.05.006

Abstract

Abstract: Continental shale oil has grown to be one of the major replacement fields for petroleum exploration in China. The laminar structure,a unique fabric feature of shale, significantly influences the evaluation of source rock quality, reservoir quality and engineering quality, which has attracted increasing attention for study. By taking typical organic-rich shales in saline and fresh-brackish lake basins in the central-western China as study objects, the characteristics of laminar structure are analyzed and their influence on the selection of sweet spot is discussed. The results show that: (1) The laminar structure varies in different types of lake basins, which is affected by the salinity of lake basin. The carbonate laminar is mainly developed in saline lake basin, but less in fresh-brackish lake basin; (2) The laminar structure has strong heterogeneity of sub-millimeter level. There are differences in TOC and pore structure among different laminae, and the quality of the same type of laminae varies greatly in various basins; (3) The laminar structure determines the characteristics of microscopic shale oil migration and accumulation as well as the enrichment mode of “in-situ source rock and reservoir”, and affects the retained hydrocarbon content, fluid mobility and fracturing engineering. The fine evaluation of laminar structure of continental shale and identification of the favorable lithofacies zone for high-quality shale development are the critical issues for petroleum exploration from outside to inside the source rock, which are the basis for the discovery of economic and effective resources inside the source rock and have great significance for the selection of shale oil “sweet spot area” and “sweet spot interval”.

CLC Number:

TE112.221

Wu Songtao, Zhu Rukai, Luo Zhong, Yang Zhi, Jiang Xiaohua, Lin Minjie, Su Ling. Laminar structure of typical continental shales and reservoir quality evaluation in central-western basins in China[J]. China Petroleum Exploration, 2022, 27(5): 62-72.

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