Water Contact Angle and Its Stability Influencing Factors of Shale Reservoirs in Longmaxi Formation, Southern Sichuan

doi:10.3969/j.issn.1006-6535.2021.05.002

Abstract

Abstract: In response to the problems that the characteristics that water contact angle in shale reservoirs changes over time are unclear and the influencing factors are unknown, water contact angle experiments were conducted to analyze the influencing factors of water contact angle and its stability in shale reservoirs. The results of the study showed that the water contact angle of shale varied exponentially with time; the inter-bed water contact angle of the dry shale sample penetration was mainly affected by the TOC content, followed by quartz, and the inter-bed stability index (CASI) of dry shale sample was mainly affected by the clay mineral content, followed by TOC; the fluid-shale interaction affected the shale surface properties, and the surface properties of vertical bedding plane of shale were more homogeneous after the fluid was saturated, while the surface properties of the parallel bedding plane more inhomogeneous. Finally, a prediction formula for the stability index of shale contact angle in different bedding direction and different fluid saturation experiment environment was proposed. The study is indicative of the clarification of oil-gas migration in shale reservoirs.

Key words: shale, water contact angle, stability, bedding orientation, shale component, saturated fluid, Longmaxi Formation

CLC Number:

TE122

Gao Zhiye, Xiong Shuling, Cheng Yu, Fan Yupeng. Water Contact Angle and Its Stability Influencing Factors of Shale Reservoirs in Longmaxi Formation, Southern Sichuan[J]. Special Oil & Gas Reservoirs, 2021, 28(5): 10-16.

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