Micro-occurrence of Cretaceous tight oil in southern Songliao Basin, NE China

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Abstract

Combined experiment method of Environmental Scanning Electron Microscope (ESEM) and Energy Dispersive Spectroscopy (EDS) was proposed to detect tight oil occurrence in micro- and nano-pores of tight sands in Member 4 of Cretaceous Quantou Formation. Observation and analysis of 168 measurement points and seventeen samples from seven typical wells shows that the tight oil occurrences in micro- and nano-pores have two main forms: oil film and oil droplet, oil film is dominant. Intra-granular pores, inter-granular pores and micro-fractures are three kinds of micro storage space, mainly inter-granular pores. The oil films in the intra-granular pores and micro-fractures are irregular and adhesive, and the size is about (1-5 μm) × (1-5 μm), the carbon mass percentage of oil films are mainly 40%-90%. The size of oil droplets is (0.2-1.0 μm) × (0.2-1.0 μm), with relatively small occurrence space. The carbon mass percentage of oil droplets are mainly 15%-30%. Reservoir types and distribution of pores control tight oil occurrence. The carbon contents and thicknesses of oil film decrease from type I to type III reservoirs. The carbon mass percentage and thicknesses are controlled by the median pore throat radius and reservoir quality coefficient.

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Gong, Y., Liu, S., Zhu, R., Liu, K., Tang, Z., & Jiang, L. (2015). Micro-occurrence of Cretaceous tight oil in southern Songliao Basin, NE China. Petroleum Exploration and Development, 42(3), 323–328. https://doi.org/10.1016/S1876-3804(15)30022-7

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