玛西斜坡区风城组高含盐致密储集层流体识别

doi:10.7657/XJPG20240304

摘要/Abstract

摘要：

准噶尔盆地玛西斜坡区二叠系风城组发育碱湖沉积的高含盐致密储集层，其油水关系复杂，流体识别难度大。利用岩性扫描测井资料构建饱含盐水地层热中子宏观俘获截面，并利用测井热中子宏观俘获截面与饱含盐水地层热中子宏观俘获截面的差值构建含油性敏感因子，再利用氯元素相对产额与总孔隙度比值构建含盐度敏感因子，将含油性敏感因子与含盐度敏感因子交会形成流体识别图版。实例应用表明，利用该流体识别图版可以对储集层流体性质进行准确判断，为试油选层提供依据。

关键词: 准噶尔盆地, 玛西斜坡区, 风城组, 致密储集层, 热中子宏观俘获截面, 岩性扫描测井, 流体识别

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

中图分类号:

毛锐, 白雨, 王盼, 黄志强. 玛西斜坡区风城组高含盐致密储集层流体识别[J]. 新疆石油地质, 2024, 45(3): 279-285.

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.

图/表 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^-