基于核磁共振测井的致密砂岩储集层有效性评价

doi:10.7657/XJPG20250115

摘要/Abstract

摘要：

鄂尔多斯盆地志靖—安塞地区上三叠统延长组长8段和长9段储集层致密，孔隙结构复杂，有效储集层的纵向分布规律不清。基于核磁共振测井资料和岩石压汞数据，提出致密砂岩储集层有效性评价方法。针对有核磁共振测井资料的井，可直接利用核磁共振测井资料获取大孔、中孔和小孔占比，构建核磁孔隙三组分指数；针对没有核磁共振测井资料的井，通过孔喉半径与核磁共振横向弛豫时间的转换关系，构建孔喉半径指数。核磁孔隙三组分指数和孔喉半径指数可定量表征致密砂岩储集层的孔隙结构。结合试油资料分析，单井米采液指数与孔隙结构呈正相关，建立致密砂岩储集层有效性评价标准。将该评价标准应用于志靖—安塞地区长8段和长9段，测井解释符合率显著提高，应用效果良好。

关键词: 鄂尔多斯盆地, 志靖—安塞地区, 延长组, 致密砂岩, 核磁共振, 孔隙结构, 储集层有效性

Abstract:

In the Zhijing-Ansai area of the Ordos Basin, the reservoirs in the 8th and 9th members of the Upper Triassic Yanchang formation (Chang 8 and Chang 9 members) are tight, with complex pore structure and unclear vertical distribution of effective reservoirs. A method for evaluating the effectiveness of the tight sandstone reservoirs was proposed based on nuclear magnetic resonance (NMR) logging data and mercury injection data of rock samples. For wells with NMR logging data, the proportions of macropores, mesopores, and micropores can be directly obtained from the NMR data, and an NMR logging-based three-pore component index can be constructed. For wells without NMR logging data, the pore throat radius index can be established by using the relationship between NMR transverse relaxation time and pore throat radius. Both the NMR logging-based three-pore component index and the pore throat radius index can quantitatively characterize the pore structure of tight sandstone reservoirs. Integrating with analysis of formation test data, it is found that single-well liquid production index per meter is positively correlated with pore structure. Thus, an effectiveness evaluation standard for tight sandstone reservoirs was established. The application of this standard to the Chang 8 and Chang 9 members in the Zhijing-Ansai area demonstrates excellent results, with significantly improved accuracy of well logging interpretation.

Key words: Ordos Basin, Zhijing-Ansai area, Yanchang formation, tight sandstone, NMR, pore structure, reservoir effectiveness

中图分类号:

TE122.1

慕倩, 李高仁, 张文静, 迟瑞强. 基于核磁共振测井的致密砂岩储集层有效性评价[J]. 新疆石油地质, 2025, 46(1): 121-126.

MU Qian, LI Gaoren, ZHANG Wenjing, CHI Ruiqiang. Effectiveness Evaluation of Tight Sandstone Reservoirs Based on NMR Logging[J]. Xinjiang Petroleum Geology, 2025, 46(1): 121-126.

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储集层类型	小孔占比/%	中孔占比/%	大孔占比/%	横向弛豫时间/ms	核磁孔隙三组分指数	特征描述
Ⅰ类储集层	<20	>40	>30	2.0~3 000.0	>30	双峰分布，第二峰值大于第一峰值，核磁总孔隙度大于10%
Ⅱ类储集层	10~30	30~50	20~30	0.3~1 000.0	10~30	双峰分布为主，第二峰值略大于第一峰值，核磁总孔隙度为7%~10%
Ⅲ类储集层	>30	<40	<20	0.3~500.0	<10	单峰分布为主，少数双峰，第二峰值远小于第一峰值，核磁总孔隙度小于7%

地层	储集层类型	小孔占比/%	中孔占比/%	大孔占比/%	孔喉半径/μm	孔隙类型	孔喉半径指数
长8段	Ⅰ类储集层	<20	30~50	>40	0.01~10.00	大孔	>0.03
	Ⅱ类储集层	20~35	30~50	20~40	0.01~1.00	中孔	0.02~0.03
	Ⅲ类储集层	>35	30~50	<40	0.01~0.30	小孔	<0.02
长9段	Ⅰ类储集层	<50	<45	>10	0.01~10.00	大孔	>0. 20
	Ⅱ类储集层	50~60	>40	<10	0.01~1.00	中孔	0.10~0.20
	Ⅲ类储集层	>60	<35	<5	0.01~0.30	小孔	<0.10