Experiments on Mobility of Mixed Shale Oil in Lucaogou Formation in Jimsar Sag

doi:10.7657/XJPG20230111

Abstract

Abstract:

In order to determine the pore-throat structure and the mobility of crude oil in the shale reservoirs of the Lucaogou formation in the Jimsar sag，the reservoirs were classified by means of thin section identification，scanning electron microscope (SEM)，and experiments such as high-pressure mercury intrusion. The mobility of the shale oil was evaluated through a displacement-NMR combined experiment to reveal the movable oil proportion，pore size variation and its controlling factors，and then establish a quantitative evaluation model of shale oil mobility. The Lucaogou formation develops 5 types of reservoir spaces including intergranular pores，intergranular-dissolution-intercrystalline pores，dissolution pores，dissolution-intercrystalline pores，and intercrystalline pores. The intergranular pores are mainly found in the silty-fine sandstone and sandy dolomite，and exhibit the best mobility. The dissolution pores are mainly in the dolomitic siltstone，and exhibits moderate mobility. Other pores are mainly in mudstone，argillaceous dolomite and limy sandstone，and show poor mobility. The lower limit of pore throats for shale oil moving is determined to be 20 nm. When the pore throat size are 60 nm and 150 nm，the movability is significantly improved，which corresponds well to the tested production capacity. Shale oil occurrence and pore-throat structure jointly affect the mobility of shale oil. The pore throats and shale oil occurrence in silty-fine sandstone and dolomitic siltstone are the best，which are the most favorable lithofacies for developing the mixed shale oil in the Lucaogou formation.

Key words: Jimsar sag, Lucaogou formation, mixed shale, reservoir, movable oil proportion, pore combination type, lower limit of pore throat, oil mobility

CLC Number:

TE122.2

GUO Haiping, WU Chengmei, ZHANG Jinfeng, XU Tianlu, XIAO Dianshi, GUO Xueyi. Experiments on Mobility of Mixed Shale Oil in Lucaogou Formation in Jimsar Sag[J]. Xinjiang Petroleum Geology, 2023, 44(1): 76-83.

Figures/Tables 8

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