油气微渗漏方式定量判别思考

杨俊

doi:10.11781/sysydz201103317

油气微渗漏方式定量判别思考

doi: 10.11781/sysydz201103317

杨俊

中国石油化工股份有限公司石油勘探开发研究院无锡石油地质研究所, 江苏无锡, 214151

基金项目: 国家自然科学基金(41072099)资助

详细信息

作者简介:
杨俊(1982- ),男,硕士,助理工程师,从事油气藏形成与分布、油气化探研究.E-mail:yangiun19821002@163.com.

中图分类号: TE132.4
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出版历程
- 收稿日期: 2010-07-06
- 修回日期: 2011-04-09
- 刊出日期: 2011-06-28

Quantitative discrimination of hydrocarbon micro-seepage pattern

Yang Jun

Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214151, China

摘要

摘要: 调研前人关于烃类微渗漏方式的研究成果,发现油气藏形成之后烃类微渗漏方式以微泡方式和水溶方式为主。通过建立等厚地层模型,提出微渗漏方式定量判别系数,基于一般地质规律假定相关参数进行计算,分析认为:(1)烃类微渗漏方式在地层中并不是一成不变的,因地质条件变化可相互转变;(2)烃类微渗漏方式总体以微泡方式为主,随地层变浅水溶方式所占比例逐渐增加,此2种方式是形成地表烃类异常的主要方式,而扩散作用只形成背景场;(3)直接盖层封盖能力、地层物性和垂向可动水含量是影响烃类微渗漏方式的重要因素。烃类微渗漏方式定量判别系数的提出,对烃类垂向微渗漏机制研究从定性走向定量意义重大,为油气化探地球化学场数值模拟、成因解释与评价奠定了基础。
- 微渗漏 /
- 微泡方式 /
- 水溶方式 /
- 判别系数 /
- 渗漏源
Abstract: Studies of hydrocarbon micro-seepage have indicated that,when reservoir has been formed,oil and gas mainly seep as micro-bubble or with water.Based on isopachous stratigraphic model,a quantitative discrimination coefficient of micro-seepage pattern has been proposed and calculated according to general geological theory.It has been concluded that,1) Due to the changes of geological conditions,the micro-seepage pattern of hydrocarbon in strata is also changing;2) Hydrocarbon usually seeps as micro-bubbles and transfers to water-soluble pattern as it comes closer to earth surface.The 2 pa-tterns result in hydrocarbon abnormality on earth surface while diffusion only forms background field;3) Sealing ability of direct seal,stratigraphic physical property and vertical movable water content are the key factors controlling hydrocarbon micro-seepage pattern.Proposal of the discrimination coefficient is significant for micro-seepage mechanism research.It also settled a foundation for numerical simulation,formation interpretation and evaluation of geochemical field in hydrocarbon chemical exploration.
- micro-seepage /
- micro-bubble pattern /
- water-soluble pattern /
- discrimination coefficient /
- seepage source

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