Scientific Journal of Earth Science March 2015, Volume 5, Issue 1, PP.1-4
Analysis of Shale Gas Formation Conditions of Carboniferous in Wuwei Basin Feng Hu1, Zhiwu Yao2, Wei Liu2 1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu Sichuan 610500, China 2. Geophysical Exploration Company, Chuanqing Drilling Engineering Co. Ltd., China National Petroleum Corporation, Chengdu Sichuan 610213, China
Abstract With the development of conventional type reservoirs into the late, shale gas as an important unconventional petroleum reservoirs causes widely concern. Wuwei basin which locals in the eastern part of Gansu aisle area is a part of Qilian-Alashan area Carboniferous with better growth and preservation, delta facies is the major sedimentary environment, followed by the lakeside facies and deep lake facies, is favor of hydrocarbon source rocks formation, the shale widely distributed, and thickness. The shale contents high organic carbon, and is in the high mature - over mature stage, the organic matter is type Ⅲ, it has better conditions for shale gas formation. Keywords: Shale Gas, Gansu, Wuwei Basin, Carboniferous, Shale, Hydrocarbon Source Rocks
武威盆地石炭系页岩气形成条件分析 胡峰 1,姚志武 2,刘伟 2 1. 西南石油大学 地球科学与技术学院,四川 成都 610500 2. 中国石油集团川庆钻探工程有限公司地球物理勘探公司,四川 成都 610213 摘
要:随着常规型油气藏的开发进入中后期,页岩气作为一种重要的非常规油气藏越来越受到广泛关注。甘肃走廊区
武威盆地是祁连—阿拉善地区石炭系发育和保存较好的地区之一,其沉积环境以三角洲为主,其次为滨湖相、深湖相, 有利于烃源岩的形成,且页岩分布广泛,厚度较大。该区石炭系页岩有机碳含量高,处于高成熟-过成熟阶段,有机质类 型为Ⅲ型,具有较好的页岩气形成条件。 关键词:页岩气;甘肃;武威盆地;石炭系;页岩;烃源岩
引言 页岩气作为一种典型的非常规天然气资源,其主体位于暗色泥页岩或高碳泥页岩中,以吸附或游离状态 [1-3]
存在于泥岩、高碳泥岩、页岩及粉砂质岩类夹层中的天然气聚集
。甘肃走廊区武威盆地位于甘肃省河西走
廊东部,是祁连—阿拉善地区石炭系发育和保存较好的地区之一,该区石炭系页岩分布广泛,具有良好的油 气地质条件,本文将根据页岩气形成条件,对武威盆地石炭系页岩气勘探前景进行分析。
1 地质概况 武威盆地南以祁连山,北以龙首山-北大山-巴音乌拉山为界,西抵桃葫芦山,东至贺兰山,总体呈近东 西走向,其所处的大地构造位置为阿拉善地块、北祁连加里东褶皱带及贺兰山南北向褶皱带三个构造单元的 交汇地带(图 1) ,它具有褶皱带-地块过渡的性质,其主体位于阿拉善地块,基底由前震旦系龙首山群中深 变质的结晶基底和下古生界浅变质岩组成,盆地面积约 27500k ㎡。武威盆地石炭系其沉积环境以三角洲为
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