基于核磁共振实验的致密砂砾岩储层孔隙分析——以准噶尔盆地东道海子凹陷二叠系上乌尔禾组为例

Pore study of tight conglomerate reservoir based on nuclear magnetic resonance experiment : a case of the Permian Upper Wuerhe Formation in the Dongdaohaizi Sag, Junggar Basin

摘要

准噶尔盆地东道海子凹陷上乌尔禾组发育深层-超深层、特低-超低孔渗砂砾岩储层。根据不同岩性样品核磁共振实验和高压压汞实验结果，分析饱和与离心状态下核磁共振 T₂ 谱响应特征，建立致密砂砾岩储层核磁共振 T₂谱与高压压汞实验孔喉半径转换关系，探讨储层孔隙参数特征。结果表明：准噶尔盆地东道海子凹陷二叠系上乌尔禾组极粗砂岩、砂质细砾岩和细一中砾岩样品的饱和状态 T₂ 谱，分别为明显双峰、不明显双峰和单峰形态；极粗砂岩的 T₂ 谱峰值弛豫时间和 T₂ 截止值较大，砂质细砾岩次之，细一中砾岩较小；极粗砂岩孔隙度较大、裂缝孔隙较发育，细一中砾岩孔隙及裂缝孔隙不发育；从极粗砂岩到细一中砾岩，储层可动孔隙半径下限和可动孔隙度逐渐减小。研究区致密砂砾岩储层整体有效孔隙度下限为 4.81% ，对应的可动孔隙度下限为 0.80% 。该结果可为东道海子凹陷上乌尔禾组致密砂砾岩储层评价及有利目标预测提供参考。

Abstract

Deep-ultra deep and extra-ultra low porosity and permeability conglomerate reservoir is developed in the Permian Upper Wuerhe Formation in the Dongdaohaizi Sag, Junggar Basin. Combined with high-pressure Hg injection, different lithology samples were conducted in nuclear magnetic resonance (NMR) experiment in this paper. Response characteristics of saturated and centrifuged NMR T₂ spectra were analyzed. Conversion models between NMR T₂ spectra and high-pressure Hg injection pore radius were established. Pore quantitative parametric features of tight conglomerate reservoir were discussed. The research results show that saturated NMR T₂ spectra of very coarse sandstones, sandy granules, and fine-medium pebbles are obvious bimodal, unobvious bimodal, and bimodal distributions respectively in the study area. The NMR relaxation time at peaks and T₂ cutoff values of very coarse sandstones are major, sandy granules are second, and that of fine-medium pebbles are minor. Porosities of very coarse sandstones are large with fracture porosity. Conversely, porosities and fracture porosities are not developed in fine-medium pebbles. From very coarse sandstones to fine-medium pebbles, lower limit of mobile pore radius and mobile porosities decrease generally. The lower limit of effective porosity for tight conglomerate reservoir is about 4.81% in Upper Wuerhe Formation of the Dongdaohaizi Sag. The corresponding lower limit of mobile porosity is about 0.80%. The lower limit of effective porosity and forecasting method of mobile porosity would be contributed to the evaluation of favorable tight conglomerate reservoir in the Upper Wuerhe Formation of the Dongdaohaizi Sag.

关键词

准噶尔盆地 / 东道海子凹陷 / 二叠系 / 上乌尔禾组 / 核磁共振 / 致密砂砾岩储层 / 孔隙参数

Key words

Junggar Basin / Dongdaohaizi Sag / Permian / Upper Wuerhe Formation / nuclear magnetic resonance / tight conglomerate reservoir / pore parameter

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基金资助

中国石油天然气集团有限公司重大科技专项(2023ZZ24YJ01)