詹卓琛,雷中英,李潇,郭小璇,张文文,代思佳,牛晓宇,辛炳夏,王乐
ZHAN Zhuochen,LEI Zhongying,LI Xiao,GUO Xiaoxuan,ZHANG Wenwen,DAI Sijia,NIU Xiaoyu,XIN Bingxia,WANG Le

• 1:密苏里科技大学
• 2:长江大学地球科学学院
• 3:中国石油化工股份有限公司石油物探技术研究院

摘要(Abstract)：

鄂尔多斯盆地上古生界煤岩空间结构及储层发育特征研究制约了煤层气的勘探开发进程。利用全直径岩心CT扫描方法,开展了鄂尔多斯盆地D区块上古生界全直径煤岩岩心三维空间结构及非均质性研究。结果表明:太原组一段的煤岩岩心水平纹层发育,高角度天然裂缝不发育,部分纹层顺层天然缝发育;山西组一段的煤岩岩心以块状构造为主,部分纹层高角度天然裂缝网络发育,顺层天然缝不发育,而且几乎被方解石完全胶结充填;山一段、太一段的煤岩沉积韵律、内部结构、裂缝发育及充填存在差异;太一段煤岩非均质较强,储层物性较差;山一段煤岩非均质较弱,尽管大部分裂缝胶结充填,但储层物性仍然较好。CT扫描技术可以很好地刻画全直径煤岩岩心空间结构及其差异,为研究区煤层气、煤层气化开采提供重要的地质依据。
The studies on spatial structure and reservoir development characteristics of Upper Paleozoic coal rocks in Ordos Basin restrict the exploration and development processes of coalbed methane. With the help of CT scanning of full-diameter core, studies on 3 D spatial structure and heterogeneity of Upper Paleozoic coal rock cores in Block D of Ordos Basin are carried out. The results show that horizontal lamina in coal rock cores in Member Tai-1 of Taiyuan Formation are well-developed, while high-angle natural fractures are less developed, and some of lamina are developed as bedding-parallel natural fractures. Coal rock cores in Member Shan-1 of Shanxi Formation are mainly massive structure, and high-angle natural fracture network of some lamina is well-developed, while bedding-parallel natural fractures are less-developed and are almost completely cemented and filled by calcite. There are differences in sedimentary rhythm, internal structure, fracture development and filling of coal rocks in Member Shan-1 and Member Tai-1. Coal rocks in Member Tai-1 has higher heterogeneity and poorer reservoir properties, while coal rocks in Member Sha-1 has relatively lower heterogeneity and better reservoir properties although most fractures are cemented and filled. CT scanning technique can well characterize spatial structure of full-diameter coal rocks and their differences, providing important geological evidences for the coal bed methane and coal bed gasified exploitation in the study area.

关键词(KeyWords)： 鄂尔多斯盆地;上古生界;煤岩;CT扫描技术;空间结构;非均质特征
Ordos Basin;Upper Paleozoic;coal rocks;CT scanning;spatial structure;heterogeneity characteristics

Abstract:

Keywords:

基金项目(Foundation): “十三五”国家科技重大专项“致密油气勘探开发关键技术研究”(2016ZX05050)

作者(Author): 詹卓琛,雷中英,李潇,郭小璇,张文文,代思佳,牛晓宇,辛炳夏,王乐
ZHAN Zhuochen,LEI Zhongying,LI Xiao,GUO Xiaoxuan,ZHANG Wenwen,DAI Sijia,NIU Xiaoyu,XIN Bingxia,WANG Le

DOI: 10.19597/j.issn.1000-3754.202011030

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