优势页岩油储层的岩性识别方法

doi:10.3969/j.issn.1672-9803.2023.03.010

摘要/Abstract

摘要： 确定页岩油“甜点”储层发育区是储层改造和水平井钻探成功的关键,而“甜点”储层的发育需要优势岩性来提供物质条件,将泥页岩地层中具有一定油气含量和生烃能力且脆性矿物含量高、易于开发的岩性定义为“优势岩性”。基于XRD矿物分析,将饶阳凹陷沙一下亚段页岩层段划分为长英质、云灰质、混合质、黏土质页岩4类基础岩性,根据泥页岩层段岩心或壁心样品的气测数据、XRD矿物成分检测、岩石热解分析等录井手段的分析测试结果,获取表征优势岩性的全烃值、C₁值、脆性指数以及岩石热解分析TOC、S₁+S₂、S₁/TOC等参数,在岩石分类的基础上,将其分别划分为优势岩性、次优势岩性、非优势岩性,从而为储层压裂改造提供选层的重要参数,并在生产实践中得到了验证,为页岩油高效开发提供了技术支撑。

关键词: 页岩油, 岩石类型, 优势岩性, 划分标准

Abstract: Determination of the development area of shale oil "sweet spot" reservoir is the key to the success of reservoir reconstruction and horizontal well drilling. Therefore, the development of "sweet spot" reservoir requires superior lithology to provide material conditions. The lithology with certain oil and gas content and hydrocarbon generation ability, high brittle mineral content and easy development is defined as "superior lithology". Based on XRD mineral analysis, the sub-member of Shahejie Formation in Raoyang depression is divided into four basic lithologies： felsic shale, cloudy lime shale, mixed shale and clay shale. According to gas logging data of core and sidewall core samples of mudstone-shale intervals,and the analysis and results of XRD mineral composition detection and rock pyrolysis analysis, the parameters characterizing superior lithology, such as total hydrocarbon value, C₁ value, brittleness index, and rock pyrolysis analysis parameters, namely, TOC, S₁+S₂ and S₁/TOC can be obtained. On the basis of rock classification, it can be divided into： superior lithology, sub-superior lithology and non-superior lithology, which provides important parameters for reservoir fracturing transformation, has been verified in production practice, and provides technical support for efficient development of shale oil.

Key words: shale oil, rock types, superior lithology, classification standards

中图分类号:

TE132.1

张文雅, 孙红华, 刘建新, 李娟, 吕伟元, 赵跃佳. 优势页岩油储层的岩性识别方法[J]. 录井工程, 2023, 34(3): 63-67.

ZHANG Wenya, SUN Honghua, LIU Jianxin, LI Juan, LYU Weiyuan, ZHAO Yuejia. Lithology identification method of superior shale oil reservoirs[J]. Mud Logging Engineering, 2023, 34(3): 63-67.

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