准噶尔盆地东部吉南凹陷二叠系油藏形成条件、成藏特征与勘探方向  

Formation Conditions,Accumulation Characteristics and Exploration Direction of Permian Reservoir in Jinan Sag,Eastern Junggar Basin

作　　者：康积伦 杨润泽 马强 林潼[2] 杨帆 卫延召[2] 苟红光[1] 李新宁 林霖 KANG Ji-lun;YANG Run-ze;MA Qiang;LIN Tong;YANG Fan;WEI Yan-zhao;GOU Hong-guang;LI Xin-ning;LIN Lin(PetroChina Tuha Oilfield Company,Hami 839009,China;Research Institute of Petroleum Exploration and Development,Beijing 100083,China)

机构地区：[1]中国石油吐哈油田公司,哈密839009 [2]中国石油勘探开发研究院,北京100083

出　　处：《科学技术与工程》2023年第32期13788-13802,共15页Science Technology and Engineering

基　　金：中国石油天然气股份有限公司前瞻性与基础性重大科技项目(2021DJ0605,2021DJ0306);中国石油天然气股份有限公司科技管理部基础性与前瞻性科技攻关项目(2021DJ0404)。

摘　　要：近年来吉南凹陷二叠系发现高产油藏,揭示了巨大油气勘探潜力。利用烃源岩与原油地球化学测试、铸体薄片观察、流体包裹体测试等多种技术手段,结合地层埋藏史和热史,研究吉南凹陷二叠系油藏形成条件和成藏特征。结果表明:吉南凹陷二叠系存在源下、源内、源上3种成藏组合。芦草沟组发育连续分布的厚层优质咸化湖盆相烃源岩,且主体达到成熟阶段,资源基础雄厚。源下、源内和源上均发育规模储集体,且芦草沟组和梧桐沟组厚层泥岩可作为良好的区域盖层,生-储-盖配置良好。吉阜1区块以潜山油藏为主,侧向油源、断裂输导、较大的供烃窗口是油藏形成的关键;萨探1和萨4区块主要为构造-岩性油藏,早期高熟油藏多被破坏或调整,现今油藏以其西部、南部侧向运移过来的成熟原油及本区块低熟-成熟原油为主体,其中萨4区块油藏被破坏殆尽。萨2区块以构造和构造-岩性油藏为主,原油来源于本区块成熟烃源岩。源上有利勘探区为断裂输导条件好、构造相对稳定、三叠系保存更完整的区域,源内勘探有利区为西部和南部构造相对稳定区域,源下有利勘探方向为源储压差大、构造相对稳定的构造高点。源内页岩油藏和西部火山岩风化壳潜山油藏是未来勘探的潜在领域。In recent years,high-yield oil reservoirs have been discovered in the Permian in Jinan Sag,revealing huge potential for oil and gas exploration.Combining with the burial-thermal history of the strata,the geological conditions and the formation characteristics of the Permian reservoir were analyzed by using a variety of technical means,such as the geochemical test of source rocks and crude oil,casting thin section and fluid inclusion test.The results show that there are three kinds of reservoir-forming assemblages in the Permian in the Jinan Depression:sub-source,intra-source and upper-source.The main body of the thick saline lacustrine source rocks in Lucaogou Formation has reached the mature stage with abundant resource base.Large-scale reservoirs are developed under,within and above the source.There are several sets of good regional cap in the longitudinal direction,and sourcing-reservoir-cap configuration is good.The Jifu 1 block is dominated by buried-hill reservoirs.Lateral oil source,fault transport and large hydrocarbon supply window are the key factors for reservoir formation.The Santan 1 and Sa4 blocks are mainly structural-lithologic reservoirs,and most of the early high-mature reservoirs were destroyed or adjusted.The present reservoirs are mainly mature crude oil migrated laterally from the west and south and low-mature crude oil in this block,among which the Sa4 block is completely destroyed.The Sa2 block is mainly composed of structural and structure-lithologic reservoirs,and the crude oil is derived from mature source rocks in this block.The above-source favorable exploration area is the area with good fault transport conditions,relatively stable structure and more complete Triassic,the intra-source favorable exploration area is the western and southern relatively stable structure area,and the under-source favorable exploration area is the structural high point with large pressure difference between source and reservoir and relatively sTable structure.Intra-source shale oil and buried-hill reservoi

关 键 词：吉南凹陷 成藏条件 成藏特征 成藏模式 勘探方向 

分 类 号：TE122.1[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]