Pore structure characteristics of tight-oil sandstone reservoir based on a new parameter measured by NMR experiment: a case study of seventh Member in Yanchang Formation, Ordos Basin

doi:10.7623/syxb201607007

Acta Petrolei Sinica ›› 2016, Vol. 37 ›› Issue (7): 887-897.DOI: 10.7623/syxb201607007

• Petroleum Exploration • Previous Articles Next Articles

Pore structure characteristics of tight-oil sandstone reservoir based on a new parameter measured by NMR experiment: a case study of seventh Member in Yanchang Formation, Ordos Basin

Dai Quanqi¹, Luo Qun^1,2, Zhang Chen³, Lu Chaojin³, Zhang Yunzhao¹, Lu Shaojie¹, Zhao Yan¹

1. Unconventional Natural Gas Institutes, China University of Petroleum, Beijing 102249, China;
2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;
3. College of Geosciences, China University of Petroleum, Beijing 102249, China.

Received:2015-11-03 Revised:2016-04-19 Online:2016-07-25 Published:2016-07-28

基于核磁共振新参数的致密油砂岩储层孔隙结构特征——以鄂尔多斯盆地延长组7段为例

代全齐¹, 罗群^1,2, 张晨³, 卢朝进³, 张云钊¹, 鲁少杰¹, 赵岩¹

1. 中国石油大学非常规天然气研究院北京 102249;
2. 中国石油大学油气资源与探测国家重点实验室北京 102249;
3. 中国石油大学地球科学学院北京 102249

通讯作者: 罗群,男,1963年9月生,1986年获武汉地质学院学士学位,2001年获中国石油勘探开发研究院博士学位,现为中国石油大学(北京)非常规天然气研究院副教授、硕士生导师,主要从事常规和非常规油气地质与资源评价的科研和教学工作。Email:luoqun2002@263.net
作者简介:代全齐,男,1991年6月生,2014年获中国地质大学(武汉)资源勘查工程专业学士学位,现为中国石油大学(北京)地质资源与地质工程专业硕士研究生,主要从事致密油储层特征研究与地质评价工作。Email:daiqq0614@163.com
基金资助:
国家自然科学基金项目（No.41372145）和国家重点基础研究发展计划（973）项目（2015CB250901）资助。

Abstract

Abstract:

Based on NMR (nuclear magnetic resonance) technology in combination with high-pressure Hg injection, scanning electron microscope (SEM) and other experimental data, 66 core samples of tight-oil sandstone reservoir in seventh Member of Yanchang Formation, Heshui block, Ordos Basin were analyzed in this study. Then a new pore structure parameter was proposed, i.e., effective porosity of movable fluid. This parameter not only can overcome the impact of small porosity measured by NMR experiment, but also takes into account the movable fluid in the pores influenced by two factors, i.e., the viscosity of hydrophilic particulate on pore surface and the constraint of tiny throats nearby. The size of effective pore space occupied by movable fluid can be quantitatively calibrated to more accurately reflect the pore structure characteristics of tight-oil reservoir and make up the defects in effectiveness evaluation of pore throat using the existing parameters such as the porosity of movable fluid. Through analyzing the relation between pore structure characteristics and the influence of new parameter, it has been found that the better the connectivity of pore throat is, the larger the effective porosity of movable fluid will be; when pore-throat sorting coefficient is within the range of 1.4-1.9, the effective porosity of movable fluid can reach the maximum; different levels of pore-throat configurations are the key for pore-throat effectiveness in tight-oil sandstone reservoir. Then, based on the effective porosity of movable fluid as major criteria, pore structures in the study area can be divided into three types, i.e., Type I - the effective porosity of the movable fluid is large than 2 % ; Type II - the effective porosity is ranged between 1 % and 2 % ; Type III - the effective porosity is smaller than 1 % . Accordingly, the classified evaluation standard should be established for tight-oil sandstone reservoir to guide the exploration and development of oil field.

Key words: nuclear magnetic resonance, effective porosity of movable fluid, tight-oil sandstone reservoir, pore structure, characteristic parameter

摘要：

以核磁共振技术为基础，结合高压压汞、扫描电镜等实验资料，对鄂尔多斯盆地合水区块延长组7段致密油砂岩储层的66个岩心样品进行了分析，提出了一种新型孔隙结构参数——可动流体有效孔隙度。该参数不仅克服了核磁共振实验所测孔隙度偏小的影响，还将孔隙内的可动流体同时受到孔隙表面亲水性颗粒的黏滞及临近细小喉道的束缚这2个因素的影响考虑在内，对可动流体占据的有效孔隙空间的大小定量化标定出来，更加准确地反映了致密油储层的孔隙结构特征，弥补了可动流体孔隙度等现有参数对储层孔喉有效性评价的不足。研究孔隙结构特征与新参数影响关系发现，孔喉的连通性越好，可动流体有效孔隙度越大；孔喉分选系数介于1.4~1.9时，可动流体有效孔隙度达到最高；不同级别的孔喉配置关系是致密油砂岩储层孔喉有效性的关键。以可动流体有效孔隙度为主要标准，将研究区孔隙结构类型划分为3类：I类孔隙结构的可动流体有效孔隙度大于2 % ，II类孔隙结构的可动流体有效孔隙度介于1 % ~2 % ，III类孔隙结构的可动流体有效孔隙度小于1 % 。据此建立了适合致密油砂岩储层孔隙结构的分类评价标准，以指导油田的勘探开发。

关键词: 核磁共振, 可动流体有效孔隙度, 致密砂岩储层, 孔隙结构, 特征参数

CLC Number:

TE122

Dai Quanqi, Luo Qun, Zhang Chen, Lu Chaojin, Zhang Yunzhao, Lu Shaojie, Zhao Yan. Pore structure characteristics of tight-oil sandstone reservoir based on a new parameter measured by NMR experiment: a case study of seventh Member in Yanchang Formation, Ordos Basin[J]. Acta Petrolei Sinica, 2016, 37(7): 887-897.

代全齐, 罗群, 张晨, 卢朝进, 张云钊, 鲁少杰, 赵岩. 基于核磁共振新参数的致密油砂岩储层孔隙结构特征——以鄂尔多斯盆地延长组7段为例[J]. 石油学报, 2016, 37(7): 887-897.

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Pore structure characteristics of tight-oil sandstone reservoir based on a new parameter measured by NMR experiment: a case study of seventh Member in Yanchang Formation, Ordos Basin

基于核磁共振新参数的致密油砂岩储层孔隙结构特征——以鄂尔多斯盆地延长组7段为例

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