Multi-mineral components of tight reservoirs determined by joint inversion of nuclear magnetic resonance and conventional logs

doi:10.7623/syxb201809006

Acta Petrolei Sinica ›› 2018, Vol. 39 ›› Issue (9): 1019-1027.DOI: 10.7623/syxb201809006

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Multi-mineral components of tight reservoirs determined by joint inversion of nuclear magnetic resonance and conventional logs

Li Chaoliu¹, Hu Falong¹, Yuan Chao¹, Li Xia¹, Li Changxi¹, Liu Xuefeng²

1. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
2. College of Science, China University of Petroleum, Shandong Qingdao 266580, China

Received:2018-02-26 Revised:2018-05-22 Online:2018-09-25 Published:2018-09-28

利用核磁共振与常规测井联合反演确定致密储层多矿物组分

李潮流¹, 胡法龙¹, 袁超¹, 李霞¹, 李长喜¹, 刘学锋²

1. 中国石油勘探开发研究院北京 100083;
2. 中国石油大学理学院山东青岛 266580

通讯作者: 李潮流,男,1973年9月生,1996年获大庆石油学院学士学位,2007年获中国石油勘探开发研究院博士学位,现为中国石油勘探开发研究院高级工程师,主要从事碎屑岩储层岩石物理与测井处理解释方法研究。Email:leechl@petrochina.com.cn
作者简介:李潮流,男,1973年9月生,1996年获大庆石油学院学士学位,2007年获中国石油勘探开发研究院博士学位,现为中国石油勘探开发研究院高级工程师,主要从事碎屑岩储层岩石物理与测井处理解释方法研究。Email:leechl@petrochina.com.cn
基金资助:
中国石油天然气集团公司测井前沿技术与应用基础研究项目（2016A-3601）和国家自然科学基金项目（No.41874152）资助。

Abstract

Abstract:

Conventional well logs, such as porosity and resistivity, are the comprehensive reflection of lithology, physical characteristics and fluid properties. These key parameters, such as porosity and hydrocarbon saturation, are calculated under several assumptions or empirical models during conventional log inversion. Big errors usually occur to the tight sandstone reservoirs composed of complex minerals, leading to the reduction in parameter calculation accuracy and fluid identification consistency. Nuclear magnetic resonance (NMR)logging is only used for analyzing the reservoir physical properties and pore structures. Although some problems in porosity-permeability evaluation of tight reservoirs can be solved in that way, a lot of reservoir geological information needs to be investigated. Based on the analysis of conventional logging theoretical response models, in combination with the modular automated processing system(MAPS) images and EDS analysis of tight sandstone reservoir in Member 7, Yanchang Formation, Ordos Basin, the main reservoir mineral types and the pore development degrees of different minerals are identified. A new method of joint inversion between NMR porosity data and conventional logs is also proposed. The optimization algorithm is applied to quantitatively identify and evaluate the types and contents of clay and major rock forming minerals in tight sandstone reservoirs. The calculation accuracy of mineral content by joint inversion method is approaching to that by element scanning logs, and the application results of mineral assemblages in rock type identification and core analysis are equivalent, which can be used for analyzing reservoir lithology and lithofacies.

Key words: well-logging interpretation, tight sandstone, petrophysics, nuclear magnetic resonance(NMR) logging, joint inversion

摘要：

常规孔隙度和电阻率测井资料是地层岩性、物性和流体性质的综合反映。常规测井资料反演处理时常采用很多假设或经验模型来计算孔隙度、含油气饱和度等关键参数，这在由复杂矿物组成的致密砂岩储层中往往会产生较大误差，使参数计算的精度和流体识别的符合率降低。核磁共振测井目前仅仅用于储层物性和孔隙结构分析，虽然可以解决致密储层孔渗评价的一些问题，但仍有大量储层地质信息有待挖掘。通过分析常规测井理论响应模型，结合鄂尔多斯盆地延长组7段致密砂岩储层的微图像拼接扫描（MAPS）成像及元素能谱分析，明确了储层主要矿物类型及不同矿物的孔隙发育程度，提出了一种利用核磁共振测井孔隙度数据与常规测井数据进行联合反演的新方法，采用最优化处理算法定量识别和评价致密砂岩储层中的黏土和主要造岩矿物的类型和含量。联合反演方法计算的矿物含量在精度上与元素扫描测井接近，矿物组合在应用于岩石类型判识方面与岩心分析的结果相当，可用于储层的岩性岩相分析。

关键词: 测井解释, 致密砂岩, 岩石物理, 核磁共振测井, 联合反演

CLC Number:

P631.8

Li Chaoliu, Hu Falong, Yuan Chao, Li Xia, Li Changxi, Liu Xuefeng. Multi-mineral components of tight reservoirs determined by joint inversion of nuclear magnetic resonance and conventional logs[J]. Acta Petrolei Sinica, 2018, 39(9): 1019-1027.

李潮流, 胡法龙, 袁超, 李霞, 李长喜, 刘学锋. 利用核磁共振与常规测井联合反演确定致密储层多矿物组分[J]. 石油学报, 2018, 39(9): 1019-1027.

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Multi-mineral components of tight reservoirs determined by joint inversion of nuclear magnetic resonance and conventional logs

利用核磁共振与常规测井联合反演确定致密储层多矿物组分

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