Variations of Physical Properties of Shale Oil in Jimsar Sag, Junggar Basin

doi:10.7657/XJPG20220111

Abstract

Abstract:

Shale reservoirs of the Permian Lucaogou formation in the Jimsar sag, Junggar basin are highly heterogeneous, so that the production of horizontal wells after volumetric fracturing stimulation declines rapidly. The oil recovery is predicted to be low by depletion development and the properties of the produced oil are very complex. After analyzing the physical properties and occurrence of the crude oil, and the physical properties of the produced fluid, and combining with the producing modes of reserves and the distribution of remaining oil, the physical properties and distribution of the shale oil are characterized in terms of pores, reservoirs and wellbore. The oil in large pores is lighter and uneasily adsorbs to the pore wall, whereas the oil in small pores is heavier and easily adsorbs to the pore wall due to more heavy components in it. The viscosity of the crude oil produced alternatively from the reservoirs with different physical properties has been changing, which can be classified into four types such as unobvious change, slight decrease, significant decrease and slight increase. The crude oil produced from the lower sweet spot interval is heavier and easy to emulsify. The viscosity of the emulsion increases sharply when the water cut is greater than 30%, so the water cut may be the primary cause for the emulsification of the crude oil. CO₂ huff and puff may be effective to produce the adsorbed crude oil that cannot be displaced through depletion development. In high water-cut period, injecting surfactants may help reduce the viscosity and elasticity of emulsified crude oil and improve the oil recovery.

Key words: Jimsar sag, Permian, Lucaogou formation, shale oil, crude oil occurrence, variation of physical property, reservoir type

CLC Number:

TE122.3

YAO Zhenhua, QIN Jianhua, GAO Yang, CHEN Chao, LIU Zhenping, ZHANG Xiaogong. Variations of Physical Properties of Shale Oil in Jimsar Sag, Junggar Basin[J]. Xinjiang Petroleum Geology, 2022, 43(1): 72-78.

Figures/Tables 10

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