摘要
云南曲靖盆地烃源岩厚度大,发现有浅层气藏,被认为勘探潜力大,但征地难。通过对盆地内已钻井的测井、录井资料进行分析,认为盆地内已发现的浅层气藏其烃源岩有机质成熟度低,排烃率低,气源不足;储集体小而分散;盖层中只有茨三段下部一层泥岩单层厚度大、岩性纯,对下伏砂体内的天然气可起到较好的封堵作用,其他泥岩和煤层单层厚度小,起不到有效封隔的作用。通过生、储、盖、油气运移等浅层气要素分析认为曲靖盆地内浅层气勘探难度大,但盆地基底不整合面具备发现有价值油气藏的有利条件。
With large thickness of source rock,some shallow gas reservoirs have been discovered in Yunnan Qujing Basin.It is considered that there exists a large exploration potential.In this study,both well-logging and mud-logging data from drilled wells are analyzed.It is found that(1) the source rock is characterized by low organic-matter maturity,low hydrocarbon discharge ratio and poor gas source;(2) reservoir body is not only small but also dispersed;(3) only the lower Ci 3 Member mudstone,with large thickness and pure lithology,has a better sealing ability to gas from underlying sandstone;(4) it is very difficult to have a shallow-gas exploration after some factors(source,reservoir,caprock,hydrocarbon migration) analysis;and(5) the unconformity surface at the basin base is favorable for discovering commercial reservoirs.
出处
《天然气技术与经济》
2012年第3期27-30,78,共4页
Natural Gas Technology and Economy
关键词
烃源
储集体
封盖能力
有机质成熟度
不整合面
hydrocarbon source,reservoir body,sealing ability,organic-matter maturity,unconformity surface
