A New Method for Identifying Fluid Types in Ultra-Deep Reservoirs in Shunbei Area, Tarim Basin

doi:10.7657/XJPG20250416

Abstract

Abstract:

The ultra-deep oil and gas reservoirs in the Shunbei area have undergone multi-period hydrocarbon charging and migration, with complex oil/gas distribution patterns, making it difficult to identify reservoir fluid types. In order to accurately evaluate the fluid types in ultra-deep reservoirs in the Shunbei area, based on the data of well drilling, logging and production test, a comprehensive correction method for the key influencing factors of gaseous hydrocarbon data was established. A new method for identifying fluid types with a three-dimensional model incorporating coefficients of oil, gas and water contents was proposed. The results indicate that the comprehensive correction method based on the gray correlation algorithm for the factors affecting gaseous hydrocarbon data, such as drilling time, bit diameter, drilling fluid displacement, drilling coring, and drilling fluid density, has improved the comparability and accuracy of gaseous hydrocarbon data. Because the C₁ content in typical gas layers is close to the total hydrocarbon content, and the heavy hydrocarbon content is relatively high in oil layers, while relatively low in water layers, a three-dimensional model using the coefficients of oil, gas and water contents is established to accurately determine the fluid types in ultra-deep reservoirs. The study results provide a basis for later decision-making on well drilling and oil and gas reservoir development.

Key words: Tarim Basin, Shunbei area, ultra-deep reservoir, fluid type, evaluation model, gas chromatography

CLC Number:

TE321

DU Huanfu, WANG Chunwei, XU Ming, HAN Junwei, ZHANG Fengjiao, CHEN Xinyi, YANG Xudong. A New Method for Identifying Fluid Types in Ultra-Deep Reservoirs in Shunbei Area, Tarim Basin[J]. Xinjiang Petroleum Geology, 2025, 46(4): 512-518.

Figures/Tables 7

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Table 1.

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Table 2.

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流体类型	含油系数	含气系数	含水系数
气层	<1.0	>10	>250
油层	>2.5	>3	>250
水层	<1.0	<3	<25
油气同层	1.0~2.5	>5	>250
油水同层	1.0~2.5	1~3	25~250
气水同层	<1.0	3~10	25~250

井名	日产液量/m³	日产油量/m³	日产水量/m³	日产气量/m³	试油结果
SHB501井	150	150	0	18 655	油层
SHB5-9井	125	0	125	1 816	水层
SHB85X井	131	44	87	94 747	气水同层
SHB121X井	43	0	43	397 509	气层