Gas migration mechanism of quasi-continuous accumulation in the Upper Paleozoic of Ordos Basin

被引：0

作者：

Li, Jun ^{[1
,2
]}

Zhao, Jingzhou ^{[1
,2
]}

Fan, Yuanfang ^{[1
,2
]}

Cao, Qing ^{[1
,2
]}

Wang, Qian ^{[1
,2
]}

Hu, Weiqiang ^{[1
,2
]}

机构：

[1] School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an

[2] Shaanxi Key Lab. of Petroleum Accumulation Geology, Xi'an Shiyou University, Xi'an

来源：

Oil and Gas Geology | 2013年 / 34卷 / 05期

关键词：

Driving force of migration; Geochemical characteristics; Migration style; Ordos Basin; Quasi-continuous gas accumulation; Upper Paleozoic;

D O I：

10.11743/ogg20130503

中图分类号：

学科分类号：

摘要：

Based on the natural gas geochemical behaviors and basic geological conditions for gas migration, this paper studied the gas migration characteristics of the quasi-continuous tight sand gas field of the Upper Paleozoic in Ordos Basin. Laterally, the variations of gas components and carbon isotope composition are mainly controlled by thermal maturity of source rocks (Ro), while vertically, they are affected jointly by thermal maturity of source rocks and gas migration fractionation. Further analysis of the migration driving force and pathway conditions indicates that the large tight gas field of the Upper Paleozoic is characterized by near-source accumulation via primary migration and short-distance secondary migration. The principle driving force for migration are diffusion force generated by the gradient of gas molecule concentration and abnormal high pressure, while buoyancy force has little or no contributions to gas migration. There are two main migration styles: surge flow caused by overpressure and diffusion flow resulted from diffusion. The overpressure-driven surge flow is predominant in the Taiyuan Formation and the 2nd Member of Shaanxi Formation within source rock interval, while the diffusion-driven diffusion flow is predominant, in the 1st Member of Shaanxi Formation and the 8th Member of Xiashihezi Formation as well as reservoirs above them. The vertical regular variations of gas composition and carbon isotope are the direct responses to these gas migration patterns in Sulige gas field.

引用

页码：592 / 600

页数：8

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