页岩气资源评价方法与关键参数探讨

566 2012年10月

石 油 勘 探 与 开 发

Vol.39 No.5

PETROLEUM EXPLORATION AND DEVELOPMENT

文章编号：1000-0747(2012)05-0566-06

页岩气资源评价方法与关键参数探讨

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基金项目： YYYQ-ZP-01

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关键词： 中图分类号：TE132.2 文献标识码：A

Methods and key parameters of shale gas resources evaluation

Chen Xinjun1, Bao Shujing1, Hou Dujie2, Mao Xiaoping2

(1. Sinopec Research Institute of Petroleum Exploration and Production, Beijing 100083, China;

2. School of Energy, China University of Geosciences, Beijing 100083, China)

Abstract: Methods and key parameters of shale gas resources evaluation are studied so as to accurately assess the potential of shale gas

resources. In much-explored areas, the volume method, followed by the analogy method, is recommended for evaluation; in less-explored areas, the analogy method is recommended. The concept of “gas-bearing shale system” is put forward and taken as an evaluation unit to calculate the thickness of shale. It refers to the lithologic assemblage sealed by upper and lower tight layers in one pressure system, composed of organic carbon-rich shale and the interbeds of sandstones and carbonates, featuring the logging responses of gas-bearing shale, with tight rocks at top and bottom, and the continuous thickness of gas-bearing interval being more than 30 m and no obvious water layer. According to exploration degree and available data, different methods may be selected to calculate the thickness of gas-bearing shale system. The logging data and the content of organic carbon are used in the areas with high degree of exploration and abundant data, while field geological profile, seismic profile, depositional characteristics and other data are considered in areas with low or ultra-low degree of exploration.

Key words: shale gas; resources evaluation; gas-bearing shale system; shale thickness

0 引言

中国沉积盆地中富有机质泥页岩分布广泛，震旦系—古近系均有分布；含气页岩厚度大，成熟度高，生烃能力强，油气显示活跃，具有较好的页岩气成藏条件，勘探前景广阔

[1-3]

作性不强。本文提出以含气泥页岩系统作为纵向评价单元（计算单元）对页岩气资源量进行评价，不但可以明确页岩气勘探开发的目的层段，获得相对客观、可靠的页岩气资源量，而且考虑到了工程压裂的可操作性，实现了与工程技术的结合。

。但各地区页岩气藏地质特征

差异大，资料完善程度不一，而且影响页岩气富集的因素多，因此很难建立统一的页岩气资源评价方法。

以往根据泥质烃源岩的累计厚度及面积来估算页岩气资源量[4]，得到的资源量很大，但在工程上的可操

1 中国页岩气资源评价方法

中国广泛发育陆相、海相、海陆过渡相泥页岩[5-6]，其中，陆相泥页岩主要分布在东部断陷盆地古近系、四川盆地及周缘的上三叠统和下侏罗统、鄂尔多斯盆