摘要
四川前陆盆地须家河组勘探在隆起带和斜坡带已获得了一批大型气田,冲断带相较于上述两个区带勘探程度低,地质条件更加复杂,勘探难度更大,但是早期发现的几个气田也证实了该区须家河组良好的含气性,依然具有较大的勘探前景。笔者通过总结前陆盆地冲断带的地质特征,分析该区带资源潜力,提出了下一步有利勘探区块。综合研究认为:前陆盆地冲断带目前勘探程度较低,位于生烃坳陷,烃源条件好;储层致密,主要为低孔、低渗;构造运动强烈,断层裂缝发育;邛西区带是作为下一步勘探的最有利区带。
A rich harvest has been yielded for the exploration of Xujiahe Formation in Sichuan Foreland Basin. Especially,some large- scale gasfields have been found in both uplift and slope belts. Comparing to these two belts,the thrust belt is featured by low exploration degree and big exploration difficulty just because of more complex geological conditions. But a few gasfields which were previously discovered show that Xujiahe Formation has a better gas- bearing capacity. So,this formation also has a bigger exploration prospect. In this study,the geological characteristics of thrust belt in foreland basin are summarized at first; and then,the resource potential is ana-lyzed; at last,some favorable blocks for further exploration are presented. Results show that( 1) the thrust belt of foreland basin,though with lower exploration degree,is located in hydrocarbon- generating depression with better source condition;( 2) the reservoirs in this belt are dominantly tight with low permeability and porosity;( 3) in this belt,tectonic movements were very strong,resulting in developed fractures and faults; and( 4) Qiongxi block is favorable for further exploration.
出处
《天然气勘探与开发》
2014年第1期10-13,19,共5页
Natural Gas Exploration and Development
关键词
前陆盆地冲断带
须家河组
成藏地质特征
勘探潜力
thrust belt of foreland basin,Xujiahe Formation,reservoir-forming geological characteristics,exploration potential
