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甘肃页岩气勘探取得新突破
2017-08-30 07:06:29 中国青年网
本报敦煌8月29日讯(记者孙海峰通讯员王锋)河西走廊传来喜讯:位于敦煌盆地五墩凹陷的敦页1井取得突破性成果,不仅发现两层厚含油层,而且发现了75.47米厚的含气层及62层沥青,现场解甲烷含量达99.62%,为优质气。这表明,五墩凹陷具有良好的油气勘探前景,对全面评价我省页岩气的资源前景及推动全省页岩气资源勘查开发利用具有积极作用。
页岩气指赋存于富有机质泥页岩及其夹层中,以吸附或游离状态为主要存在方式的非常规天然气,成分以甲烷为主,是一种清洁、高效的清洁能源。较常规天然气相比,页岩气开发具有开采寿命长、生产周期长等优点,大部分产气页岩分布范围广、厚度大,普遍含气,这使得页岩气井能够长期以稳定速率产气。我省具有规模的生油气盆地共有15个,预测页岩气资源潜力为8.61至13.42万亿立方米。
从2014年起,省地质调查院在河西走廊中小盆地群开展新区、新层系、新类型的页岩(油)气研究,划分出白垩系、中-下侏罗系、三叠系和石炭-二叠系4套生油岩系和古近系、白垩系、侏罗系、三叠系、石炭系、志留系6套储油层,总结出以上生油岩系和储油层具有多沉积凹陷、多生油中心、多次油气运移-聚集、多油藏类型的特点。(转3版)
(接1版)通过这一研究成果,优选出鄂尔多斯盆地、武威盆地、敦煌盆地等作为首批开展页岩(油)气资源潜力调查评价的盆地。
2016年,“敦煌盆地页岩气资源调查评价”项目下达,省地质调查院在地质、重磁电剖面、地震及钻井资料研究的基础上,经专家论证在敦煌盆地五墩凹陷部署了敦页1井。不到一年时间,就在中侏罗世中间沟组发现了2层厚度分别为5.1米和17.53米的含油层;厚度75.47米的1层含气层,现场解析每吨含气量1.90立方米至2.44立方米,埋藏深度仅为1154.96米至1230.91米。
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