塔里木盆地顺北地区顺北84X井超千米含油气重大发现及其意义  

A major discovery of hydrocarbon-bearing layers over 1,000-meter thick in well Shunbei 84X,Shunbei area,Tarim Basin and its implications

作　　者：曹自成[1] 云露[1] 漆立新[1] 李海英[1] 韩俊[1] 耿锋[1] 林波[1] 陈菁萍[1] 黄诚[1] 毛庆言[1] CAO Zicheng;YUN Lu;QI Lixin;LI Haiying;HAN Jun;GENG Feng;LIN Bo;CHEN Jingping;HUANG Cheng;MAO Qingyan(Northwest Oil Field Company,SINOPEC,Urumqi,Xinjiang 830011,China)

机构地区：[1]中国石化西北油田分公司,新疆乌鲁木齐830011

出　　处：《石油与天然气地质》2024年第2期341-356,共16页Oil & Gas Geology

基　　金：国家自然科学基金项目(U21B2063);中国石化科技部项目(P23078、P24172);新疆维吾尔自治区天山英才计划优秀工程师项目(顺北超深碳酸盐岩油气藏高效勘探开发)。

摘　　要：塔里木盆地顺北中部北东向走滑断裂带长期处于油气运聚富集的优势区,顺北8号走滑断裂带实钻揭示沿断裂带发育断控缝洞型油气藏,顺北84X井纵向上沿断裂带含油气高度高达1088 m,揭示断控缝洞型油气藏含油气高度大、不受现今构造高低控制。为查明断控缝洞型油气藏含油气高度的主控因素,立足顺北中部奥陶系碳酸盐岩油气藏的成藏地质条件和钻探成果,开展顺北84X井的储层、圈闭及成藏特征等石油地质条件分析,为深化断控缝洞型油气藏认识和向深层评价拓展提供支撑。研究表明:①走滑构造破碎是致密碳酸盐岩成储的关键,其储层发育深度不受碳酸盐岩地层埋深的控制,在近9000 m的埋深条件下仍发育断控缝洞型储集体;②上覆巨厚泥岩盖层顶封、两侧致密灰岩侧封、走滑断裂平面分段和纵向分层变形是形成断控缝洞型圈闭的关键;③油-源对比分析表明油气来自寒武系玉尔吐斯组烃源岩,证实了前期顺北中、东部“寒武多期供烃、构造破裂成储、原地垂向输导、晚期成藏为主、走滑断裂控富”的成藏模式的合理性。顺北84X井的发现揭示塔里木盆地超深层致密碳酸盐岩发育受走滑断裂控制,储层纵向深度大,油气充注足,超深层勘探潜力巨大。The NE-trending strike-slip fault zones in the central Shunbei area,Tarim Basin have long been the destination of hydrocarbon migration,accumulation,and enrichment.Dilling has revealed the occurrence of faultcontrolled,fractured-vuggy hydrocarbon reservoirs along the No.8 strike-slip fault zone in the Shunbei area.Along this fault zone,1088-m-thick hydrocarbon column has been discovered in well Shunbei 84X.The fault-controlled,fractured-vuggy hydrocarbon reservoirs are characterized by a great hydrocarbon column height,which is independent of the heights of current structures.To identify the primary factors controlling the large hydrocarbon column height of these reservoirs,we examine the characteristics of reservoirs,traps,and hydrocarbon accumulation in well Shunbei 84X,as well as the distribution pattern of fault-controlled,fractured-vuggy hydrocarbon reservoirs within.The results indicate that the tectonic fracturing of strike-slip structures plays a crucial role in the formation of tight carbonate reservoirs.Furthermore,the depth of these reservoirs is not limited by the burial depth of carbonate strata,with fault-controlled fractured-vuggy reservoirs even identified at a burial depth of nearly 9000 m.The formation of fault-controlled fracturedvuggy traps is primarily influenced by the top sealing capacities of the significantly thick overlying mudstone cap rocks,the side sealing capacities of tight limestones on both sides,and the horizontal segmentation and vertical stratification of strike-slip faults.Oil-source correlation reveals that oil and gas originate from the source rocks in the Cambrian Yuertus Formation,further confirming the hydrocarbon accumulation mode consisting of multiphase hydrocarbon supply from the Cambrian source rocks,reservoir formation by tectonic disruption,in-situ vertical hydrocarbon transport,a predominance of late-stage accumulation,and strike-slip fault-controlled hydrocarbon enrichment in the east-central Shunbei area.The major discovery in well Shunbei 84X in the Shunbei are

关 键 词：含油气高度 超深层 断控油气藏 顺北84X井 顺北地区 塔里木盆地 

分 类 号：TE122.3[石油与天然气工程—油气勘探]