鄂尔多斯盆地三叠系延长组长7段页岩油勘探发现与资源潜力  

Discovery and resource potential of shale oil of Chang 7 member,Triassic Yanchang Formation,Ordos Basin

作　　者：付金华[1,2] 刘显阳[1,2] 李士祥[1,3] 郭芪恒 周新平[1,3] 杨伟伟[1,3] Fu Jinhua;Liu Xianyang;Li Shixiang;Guo Qiheng;Zhou Xinping;Yang Weiwei(National Engineering Laboratory for Exploration and Development of Low-Permeability Oil and Gas Fields;PetroChina Changqing Oilfi eld Company;Research Institute of Exploration&Development,PetroChina Changqing Oilfi eld Company)

机构地区：[1]低渗透油气田勘探开发国家工程实验室 [2]中国石油长庆油田公司 [3]中国石油长庆油田公司勘探开发研究院

出　　处：《中国石油勘探》2021年第5期1-11,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”(2016ZX05050);国家重点基础研究发展计划(973项目)“淡水湖盆细粒沉积与富有机质页岩形成机理”(2014CB239003)。

摘　　要：在梳理总结“十三五”期间鄂尔多斯盆地三叠系延长组长7段页岩油勘探成果、理论技术进展的基础上,分析长7段页岩油的资源潜力,提出了“十四五”页岩油发展方向。鄂尔多斯盆地发育重力流夹层型、三角洲前缘夹层型、纹层页岩型、页理页岩型4类页岩油,其中在湖盆中部发现10亿吨级庆城大油田,在湖盆周边初步落实5×108t规模储量;纹层页岩型页岩油风险勘探展现出新苗头。研究表明,优质烃源岩为页岩油富集提供了大量富烃优质流体,多类型的储集空间和源内生烃增压形成的持续高压充注是长7段页岩油规模成藏、甜点高产的核心,深水区广泛发育的砂质沉积构成了页岩油的勘探甜点;攻关形成的地质工程甜点综合评价技术、丛式水平井防塌优快钻完井技术和水平井“超前蓄能、细分切割”体积压裂技术等配套勘探技术系列是发现页岩油规模储量的重要保障。“十三五”期间丰硕的勘探成果,更加坚定了在湖盆中部扩大重力流夹层型页岩油规模含油富集区,以及在湖盆周边开拓三角洲前缘夹层型页岩油勘探新领域的信心,同时积极探索页岩型页岩油新类型技术攻关试验,为长庆油田页岩油高质量快速发展提供雄厚的资源基础。The exploration results,theoretical and technical progress of shale oil in Chang 7 member of Triassic Yanchang Formation are summarized during the 13th Five-Year Plan period,resource potential is analyzed,and the exploration targets proposed during the 14th Five-Year Plan period.There are four types of shale oil in Ordos Basin,including gravity fl ow interlayered type,delta front interlayered type,laminar shale type and laminated shale type.Among them,a one-billion-ton-level Qingcheng Oilfi eld has been discovered in the central lake basin,and large-scale reserves of 5×108t been preliminarily identifi ed in the peripheral lake basin;In addition,new signs have been observed in the risk exploration of laminar shale type shale oil.The study results show that high-quality source rocks supply a large amount of hydrocarbon fl uids for shale oil enrichment.Multiple types of reservoir space and continuous high-pressure charging caused by hydrocarbon generation pressurization inside the source rock are the key to large-scale oil accumulation and high yield of sweet spots.The widely developed sandy deposits in deep water areas are sweet spots for shale oil exploration.A series of supporting technology,such as comprehensive evaluation technology of geological-engineering sweet spots,anti-collapse fast and optimal drilling and completion technology of cluster horizontal well,and“advanced energy storage and subdivision cutting”volume fracturing technology of horizontal well,are important guarantees for the discovery of large-scale shale oil reserves.The fruitful exploration results achieved during the 13th Five-Year Plan period support to strengthen the confi dence in expanding the scale of gravity fl ow interlayered type shale oil enrichment area in the central lake basin and exploring new fi elds of delta front interlayered type shale oil in the peripheral lake basin.Meanwhile,new supporting technology is actively researched,so as to provide a solid resource foundation for the high-quality and rapid development of shal

关 键 词：鄂尔多斯盆地 页岩油 延长组长7段 勘探发现 资源潜力 

分 类 号：TE122.1[石油与天然气工程—油气勘探]