Identification of Fluid in Highly Saline Tight Reservoirs of Fengcheng Formation in Maxi Slope Area

doi:10.7657/XJPG20240304

Abstract

Abstract:

The Permian Fengcheng formation in the Maxi slope area of the Junggar basin is characterized by highly saline tight reservoirs deposited in alkaline lakes, and the relationship between oil and water in these reservoirs is complicated, which leads to difficulties in fluid identification. A thermal neutron macroscopic capture cross-section of the highly saline formation was constructed by using lithoscanner logging data, and an oil-sensitive factor was constructed by using the difference between the thermal neutron macroscopic capture cross-section from logging and the thermal neutron macroscopic capture cross-section of the brine-saturated formation. Furthermore, a salinity-sensitive factor was constructed by using the ratio of chlorine element relative yield to total porosity. Then, a fluid identification chart was established by intersecting the oil-sensitive factor with the salinity-sensitive factor. The actual application shows that this fluid identification chart can accurately assess reservoir fluid properties and provide a basis for selecting formation test layers.

Key words: Junggar basin, Maxi slope area, Fengcheng formation, tight reservoir, thermal neutron macroscopic capture cross-section, lithoscanner logging, fluid identification

CLC Number:

MAO Rui, BAI Yu, WANG Pan, HUANG Zhiqiang. Identification of Fluid in Highly Saline Tight Reservoirs of Fengcheng Formation in Maxi Slope Area[J]. Xinjiang Petroleum Geology, 2024, 45(3): 279-285.

Figures/Tables 7

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井名	井段/m	总矿化度/ （mg·L^-1）	热中子宏观俘获截面/m^-1
MH48井	5 213—5 276	254 165.81	10.85
MH52井	5 436—5 444	284 099.57	11.87
MH52井	4 967—5 058	279 283.52	11.71
MH281井	4 804—4 850	266 203.67	11.26
MH54井	5 038—5 130	345 359.76	13.95

矿物类型	溶解性	释放离子
天然碱	极易溶于水	Na⁺、HCO₃^-
碳钠镁石	微溶于水	Na⁺、CO₃^2-
氯碳钠镁石	部分溶于水	Na⁺、Cl^-
硅硼钠石	不溶于水
碳钠钙石	不溶于水
石盐	极易溶于水	Na⁺、Cl^-