辽河坳陷东部凹陷深层火山岩气藏的发现与勘探启示  

Discovery and exploration inspiration of deep volcanic gas reservoirs in eastern sag of Liaohe depression

作　　者：刘宝鸿[1] 张斌[1] 郭强[1] 谭宁川[1] 韩锋[1] 王建飞[1] 陈星州 Zhang Bin;Guo Qiang;Tan Ningchuan;Han Feng;Wang Jianfei;Chen Xingzhou(PetroChina Liaohe Oilfield Company)

机构地区：[1]中国石油辽河油田公司

出　　处：《中国石油勘探》2020年第3期33-43,共11页China Petroleum Exploration

基　　金：国家科技重大专项“大型油气田及煤层气开发”子课题“渤湾湾盆地北部油气富集规律与油气增储领域研究”(2016ZX05006-005);中国石油天然气股份有限公司重大科技专项“辽河油田千万吨稳产关键技术研究与应用”子课题“辽河探区可持续规模增储勘探关键技术研究”(2017E-1601)。

摘　　要：火山岩油气藏是辽河坳陷油气勘探的重点领域之一,目前已发现多个以粗面岩为代表的中浅层火山岩油藏,但在深层火山岩及天然气领域未获发现。为寻求规模资源发现开展了针对深层火山岩的攻关研究,通过岩心观察、单井分析、储层描述、烃源岩评价等研究,结合“两宽一高”地震资料与时频电磁技术,识别出多个火山岩体目标,成功部署了风险探井JT1井,并获得高产工业气流。研究表明,东部凹陷深层沙河街组三段烃源岩具有规模生气潜力,为天然气规模成藏提供了丰厚的物质基础;相比沉积岩,火山岩物性受埋深影响小,特别是玄武质角砾岩具备良好的储集条件;烃源岩层系中的火山岩被泥岩包裹,泥岩既是气源岩又是盖层,具有得天独厚的成藏条件。JT1井的成功,实现了东部凹陷天然气勘探的重大突破,对辽河坳陷乃至渤海湾深层火山岩勘探都具有重要的指导意义。Volcanic oil and gas reservoirs are one of the key areas of oil and gas exploration in the Liaohe depression.Multiple middle-shallow volcanic oil reservoirs represented by trachyte have been discovered,while no breakthroughs were made in fields of deep volcanic rocks and natural gas exploration.In order to make large-scale resource discovery,research on deep volcanic rocks was carried out.Through core observation,single well analysis,reservoir description,source rock evaluation and other researches,combined with wide-broadband,wide azimuth and high-density seismic data and time-frequency electromagnetic technology,multiple volcanic rock targets were identified.Risk exploration Well JT1 was successfully deployed and drilled,obtaining high-production industrial gas flow.Studies show that the deep source rocks of the Sha-3 member of Shahejie Formation in the eastern sag have the potential of large-scale gas generation,which provides rich material basis for large-scale gas accumulation.Compared with sedimentary rocks,the physical properties of volcanic rocks are less affected by burial depth,especially basaltic breccia,which has good reservoir conditions.The volcanic rocks in the source rock formations are wrapped by mudstones,which are both source rocks of gas and cap rocks.The accumulation conditions are very favorable.The success of Well JT1 has achieved an important breakthrough in gas exploration in the eastern sag,which is of great instructive significance to the exploration of deep volcanic rocks in the Liaohe depression and even in the Bohai Bay Basin.

关 键 词：辽河坳陷 东部凹陷 天然气 火山岩 玄武岩 勘探发现 

分 类 号：TE122.2[石油与天然气工程—油气勘探]