0 引言
1 煤层气地质背景
1.1 含煤地层与埋深
表1 煤岩样品含气量及储层物性测试统计Table 1 Statistical of gas content of coal samples and physical properties of reservoir |
区块 | 埋深/m | R O,max/% | 含气量/(m3/t) | 地层温度/℃ | 储层压力/MPa | 样品数/块 |
---|---|---|---|---|---|---|
府谷区块 | 7 | |||||
保德区块 | 10 | |||||
杨家坡区块 | 13 | |||||
临兴中区块 | 18 |
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郭广山(1982-),男,河北沧州人,高级工程师,硕士,主要从事非常规油气地质研究.E-mail:guogsh2@cnooc.com.cn. |
收稿日期: 2020-07-20
修回日期: 2020-12-26
网络出版日期: 2021-03-22
Study on variation law and controlling factors of coal gas content in north section of east margin of Ordos Basin
Received date: 2020-07-20
Revised date: 2020-12-26
Online published: 2021-03-22
Supported by
The CNOOC Science and Technology Research Project(2020 OT-XNY02)
依托鄂尔多斯盆地东缘含煤地层发育情况、埋藏史、构造演化史、岩浆活动等地质背景,选取北段保德区块、神府区块府谷区、临兴杨家坡区、临兴中区4个相邻煤层气区块作为研究对象,依托4个区块共48块煤样含气量和镜质组反射率测试数据,结合录井、试井、地震等资料,探讨了不同因素对煤层气含气量的控制作用。研究结果显示,对于浅部煤层含气量主要受深成作用影响,与埋深和储层压力呈正相关关系;中深部煤层以“含气量临界深度”为界,含气量受地层温度和储层压力耦合作用影响;紫金山岩体对含气量影响主要取决于煤层与岩浆接触关系、岩浆对煤层保存条件破坏程度。
郭广山 , 柳迎红 , 李林涛 . 鄂尔多斯盆地东缘北段煤层含气量变化规律及控制因素[J]. 天然气地球科学, 2021 , 32(3) : 416 -422 . DOI: 10.11764/j.issn.1672-1926.2020.12.018
Based on the development, burial history, tectonic evolution history, magmatic activity and other geological background of coal-bearing strata in the eastern margin of Ordos Basin, four adjacent coalbed methane blocks(Baode block, Fugu block, Yangjiapo block and Linxingzhong block)are selected as the research objects, and the gas content and vitrinite reflectance test data of 48 coal samples in the four blocks are collected. The controlling effect of different factors on gas content is discussed based on well test and seismic data. The research results show that the gas content of shallow coal seam is mainly affected by diagenesis, which is positively correlated with burial depth and reservoir pressure; the gas content of middle deep coal seam is bounded by "critical depth of gas content", which is affected by the coupling effect of formation temperature and reservoir pressure; the influence of Zijinshan rock body on gas content mainly depends on the contact relationship between coal seam and magma, and the destruction of coal seam preservation conditions by magma degree.
表1 煤岩样品含气量及储层物性测试统计Table 1 Statistical of gas content of coal samples and physical properties of reservoir |
区块 | 埋深/m | R O,max/% | 含气量/(m3/t) | 地层温度/℃ | 储层压力/MPa | 样品数/块 |
---|---|---|---|---|---|---|
府谷区块 | 7 | |||||
保德区块 | 10 | |||||
杨家坡区块 | 13 | |||||
临兴中区块 | 18 |
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