玛湖凹陷风城组页岩油储集层关键参数测井评价方法

doi:10.7657/XJPG20250614

摘要/Abstract

摘要： 综合高精度岩石物理联测实验和测井新技术资料，开展了玛湖凹陷风城组岩相、有效孔隙度及可动油孔隙度3个页岩油储集层关键参数的测井表征研究。结果表明：根据岩心、电成像图像、孔隙类型、矿物含量等，将玛湖凹陷风城组页岩油储集层划分为长英质岩相、白云质/石灰质岩相和黏土质混合岩相，构建混积岩指数与微孔隙指数对岩相进行识别；利用TRA（Tight Reservoir Analysis）实验测量岩样孔隙度，明确长英质岩相为物性最好的岩相类型，利用TRA实验结果刻度核磁共振测井，构建分岩相的变T₂截止值有效孔隙度表征模型；基于多状态T₁-T₂核磁共振实验对比，结合核磁共振测井特征，揭示3种岩相的可动油、束缚油、毛细管束缚水、沥青和黏土束缚水的位置，形成页岩油赋存状态识别图版；根据岩相、有效孔隙度及可动油孔隙度的表征结果，结合重点探井产液剖面资料，明确风城组有利岩相组合是长英质岩相与黏土质混合岩相的互层。研究结果可为中国其他陆相页岩油联测实验分析提供技术支持，并为页岩油储集层评价提供借鉴。

关键词: 玛湖凹陷, 风城组, 页岩油储集层, 岩相, 核磁共振, 有效孔隙度, 可动油

Abstract:

Based on the high-precision petrophysical experiments and the data acquired by new logging techniques, a logging-based characterization was conducted on three key parameters (lithofacies, effective porosity, and movable oil porosity) of shale oil reservoirs in the Fengcheng formation of Mahu sag, Junggar Basin. The following results are obtained. First, according to the core characteristics, FMI images, pore types, and mineral contents, the Fengcheng shale oil reservoirs are divided into felsic, dolomitic/calcareous, and clayey mixed lithofacies. The diamictite index and micro-pore index are constructed to identify lithofacies. Second, a tight reservoir analysis (TRA) experiment is performed to measure porosity of rock samples, confirming that the felsic lithofacies presents the best physical properties. Using TRA experiment results to calibrate the NMR logging data, an effective porosity characterization model with variable T₂ cutoff of different lithofacies is established. Third, through comparison of multi-state T₁-T₂ NMR experiments, and considering the NMR logging responses, the positions of movable oil, bound oil, capillary bound water, asphalt and clay bound water of three lithofacies are revealed, and the shale oil occurrence identification chart is formed. According to the characterization results of lithofacies, effective porosity and movable oil porosity, together with the fluid production profiles of key wells, it is clarified that the interbedding of felsic lithofacies and clayey mixed lithofacies forms a favorable lithofacies combination in the Fengcheng formation. The research provides technical support for the experimental analysis of other continental shale oil reservoirs in China, and contributes a reference for shale oil reservoir evaluation.

Key words: Mahu sag, Fengcheng formation, shale oil reservoir, lithofacies, NMR, effective porosity, movable oil

中图分类号:

P631

毛锐, 尉珈敏, 王盼, 李晴晴, 赵磊. 玛湖凹陷风城组页岩油储集层关键参数测井评价方法[J]. 新疆石油地质, 2025, 46(6): 779-789.

MAO Rui, WEI Jiamin, WANG Pan, LI Qingqing, ZHAO Lei. Logging-Based Evaluation of Key Parameters of Shale Oil Reservoirs in Fengcheng Formation, Mahu Sag[J]. Xinjiang Petroleum Geology, 2025, 46(6): 779-789.

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压裂分级	簇	深度/m	岩相组合	平均有效孔隙度/%	平均可动油孔隙度/%	6次产液剖面平均日产油量/t
7	2	4 599—4 601	厚层长英质岩相与黏土质混合岩相	3.0	1.6	3.398
7	1	4 614—4 615		2.6	1.3	1.143
6	2	4 636—4 638		2.9	1.7	1.353
6	1	4 648—4 649	薄层黏土质混合岩相、白云质/石灰质岩相、长英质岩相频繁互层	2.5	0.4	0.223
5	3	4 668—4 669		1.9	1.0	0.658
	2	4 680—4 681		2.4	0.6	0.323
	1	4 693—4 694		2.2	1.0	0.333
4	3	4 710—4 711	厚层黏土质混合岩相与白云质/石灰质岩相（含碱矿）	1.6	0.8	0
	2	4 723—4 724		1.7	1.1	0
	1	4 733—4 735		2.4	1.0	0
3	2	4 746—4 747	厚层黏土质混合岩相与长英质岩相	2.1	0.5	0.135
3	1	4 750—4 756	厚层黏土质混合岩相与长英质岩相	2.2	1.8	1.750
2	2	4 770—4 771	厚层长英质岩相与白云质/石灰质岩相	2.0	1.1	0.493
2	1	4 790—4 792	厚层长英质岩相与白云质/石灰质岩相	1.8	1.1	0.763
1	2	4 817—4 818	厚层长英质岩相与白云质/石灰质岩相	2.1	0.9	0.917
1	1	4 824—4 826	厚层长英质岩相与白云质/石灰质岩相	1.8	1.1	0.252