常规压汞-恒速压汞联合曲线构型模式及其指示意义

doi:10.7657/XJPG20240613

摘要/Abstract

摘要：

利用构型理论和层次分析方法，对常规压汞-恒速压汞联合曲线构型形貌进行划分，建立具有普遍意义的常规压汞-恒速压汞联合曲线三段式构型模式，探讨了该模式对岩石孔喉体系及其润湿滞后特性的指示意义。结果表明：常规压汞-恒速压汞联合曲线由a、b和c构型段组成，各构型段相互衔接，形貌各异；a构型段呈重叠形貌，指示了大孔喉体系，常规压汞-恒速压汞联合曲线无润湿滞后特性；b构型段呈分离形貌，可细分为b₁和b₂构型亚段，b₁构型亚段指示了中孔喉体系，恒速压汞曲线无润湿滞后特性，常规压汞曲线有润湿滞后特性，b₂构型亚段指示了中孔喉体系，常规压汞-恒速压汞联合曲线关联润湿滞后特性；c构型段呈重叠形貌，指示了小孔喉体系，常规压汞-恒速压汞联合曲线具有同等润湿滞后特性；常规压汞汞弯液面变形集中于b—c构型段，恒速压汞汞弯液面变形集中于b₂构型亚段—c构型段；常规压汞曲线和恒速压汞曲线的b₁构型亚段可用于接触角校正。常规压汞-恒速压汞联合曲线的三段式构型模式，对分段接触角校正及表征岩石孔喉分布具有重要指导意义。

关键词: 常规压汞, 恒速压汞, 毛细管压力曲线, 构型模式, 孔喉体系, 润湿滞后

Abstract:

Based on the configuration theory and the analytic hierarchy process (AHP), the configuration shapes of the combined conventional mercury intrusion-constant rate mercury intrusion (CMI-CRMI) curves were classified, and a universal three-segment configuration pattern for the curves was established. The indicative significance of this pattern to the pore-throat systems and their wetting hysteresis was clarified. The results show that the combined CMI-CRMI curves consist of three configuration segments: a, b, and c, which are interconnected but exhibit distinct shapes. The segment a displays an overlapping shape, indicative of a macro-pore-throat system, where the combined CMI-CRMI curve shows no wetting hysteresis. The segment b demonstrates a separated shape and can be subdivided into subsegments b₁ and b₂. Subsegment b₁ indicates a meso-pore-throat system, where the CRMI intrusion curve shows no wetting hysteresis, but the CMI curve does. Subsegment b₂ also indicates a meso-pore-throat system, where the combined CMI-CRMI curve shows wetting hysteresis. The segment c exhibits an overlapping shape, representing a micro-pore-throat system, where both the CMI and CRMI curves exhibit equal wetting hysteresis. The deformation of the mercury meniscus during CMI is concentrated in the segments b and c, while the deformation of the mercury meniscus during CRMI is concentrated in the segments b₂ and c. Subsegment b₁ in both the CMI and CRMI curves can be used for contact angle correction. This three-segment configuration pattern of the combined CMI-CRMI curves provides a significant guidance for segmental contact angle correction and pore-throat distribution characterization.

Key words: conventional mercury intrusion, constant rate mercury intrusion, capillary pressure curve, configuration pattern, pore-throat system, wetting hysteresis

中图分类号:

TE125.1

代金友, 雷禧桢, 皮莎, 沈小述, 陈代欣. 常规压汞-恒速压汞联合曲线构型模式及其指示意义[J]. 新疆石油地质, 2024, 45(6): 735-741.

DAI Jinyou, LEI Xizhen, PI Sha, SHEN Xiaoshu, CHEN Daixin. Configuration Pattern of Combined Conventional Mercury Intrusion-Constant Rate Mercury Intrusion Curves and Its Indicative Significance[J]. Xinjiang Petroleum Geology, 2024, 45(6): 735-741.

图/表 4

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岩样编号	孔隙度/ %	渗透率/ mD	压汞方式	压力段/ MPa	最大进汞饱和度/%	分选系数	歪度	峰态	喉道均质系数	平均喉道半径/ μm	储集层类型
JQ	19.5	63.860	常规	0~100.0	88.42	2.371	0.370	0.763	0.453	3.944	中孔中渗
JQ	19.5	63.860	恒速	0~6.2	81.05	1.807	0.428	0.784	0.474	4.001	中孔中渗
JK	11.7	1.280	常规	0~100.0	90.38	2.284	0.322	0.758	0.507	0.726	低孔特低渗
JK	11.7	1.280	恒速	0~6.2	63.64	1.101	0.338	0.934	0.411	0.943	低孔特低渗
JE	5.5	0.100	常规	0~200.0	84.19	1.622	0.231	0.932	0.290	0.216	特低孔超低渗
JE	5.5	0.100	恒速	0~6.2	56.81	0.778	0.247	0.682	0.517	0.375	特低孔超低渗
JB	6.5	0.025	常规	0~200.0	92.32	1.434	0.406	0.923	0.481	0.099	特低孔超低渗
JB	6.5	0.025	恒速	0~6.2	37.20	0.360	0.418	0.733	0.781	0.207	特低孔超低渗

岩样编号	地区层位	井名	深度/m	孔隙度/%	渗透率/mD
A	鄂尔多斯盆地延长组
B	苏里格气田桃2区块山1段	召96井	3 287.9	13.09	0.214
YC-6	鄂尔多斯盆地延长组长7油组			12.90	0.390
YC-5	鄂尔多斯盆地延长组长7油组			13.10	0.440