鄂尔多斯盆地三叠系延长组相对高放射性砂岩定量识别*

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摘要相对高放射性砂岩储层多数具可观的油气资源潜力。相对高放射性砂岩因其具有与泥质地层相类似的放射性测井响应特征而常被误判进而会导致有效储层遗漏。本文在分析常规砂、泥岩地层中自然电位曲线与自然伽马曲线响应特征及关系的基础上，提出了相对高放射性砂岩定量识别方法。以鄂尔多斯盆地三叠系延长组为例：常规砂、泥岩地层中的自然电位曲线与自然伽马曲线响应具有同步性且呈正相关，然而在相对高放射性砂岩中两者并不同步。基于这一关系，实现了相对高放射性砂岩定量化识别，并对自然伽马曲线进行了放射性“虚拟补偿”，同时就其测井评价方法进行了探讨。实例表明本文提出的方法有效，可以减少对储层的误判和遗漏。

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关键词：相对高放射性砂岩岩性定量识别放射性虚拟补偿鄂尔多斯盆地三叠系延长组

Abstract： Most relatively high-level radioactive sandstone (HRSS) reservoir has considerable oil (or gas) resource potential. HRSS is often wrongly identified due to its similar logging response characteristics as mudstone, which leads to the omission of effective reservoirs. In this paper, a quantitative identifi cation method for HRSS is proposed after the analyzing of the response characteristics and relationship between spontaneous potential log and natural gamma-ray log in conventional sandstone and mudstone strata. Take the Upper Triassic Yanchang Formation in Ordos Basin as an example: the responses of spontaneous potential log and the responses of natural gamma-ray log are synchronized and positively correlated in conventional sandstone and mudstone strata, but they are not synchronized in HRSS. Quantitative identification of HRSS was realized based on this synchronization feature, and a “virtual compensation” of natural gamma-ray log was performed. At the same time, logging evaluation method about HRSS has been discussed. The fi nal results shows that this identification method work effectively, and can reduce the misjudgment and omission of effective reservoirs.

Key words：

收稿日期: 2018-04-14;

基金资助:

本研究由国家“863”计划先进能源技术领域课题（编号：2012AA050103）资助。

通讯作者: 张小莉（Email : zhangxl@nwu.edu.cn） E-mail: Email: zhangxl@nwu.edu.cn

作者简介: 李亚军，西北大学博士研究生，矿产普查与勘探专业；现主要从事测井资料解释与非常规储层测井评价。E-mail: 2602040130@163.com

引用本文:

. 鄂尔多斯盆地三叠系延长组相对高放射性砂岩定量识别*[J]. 应用地球物理, 2019, 16(3): 315-321.

. Quantitative identification of relatively highlevel radioactive sandstone in the Upper Triassic Yanchang Formation of the Ordos Basin, China*[J]. APPLIED GEOPHYSICS, 2019, 16(3): 315-321.