川西龙门山前带茅口组二段沉积特征及储层形成机制
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1.中国石化石油勘探开发研究院无锡石油地质研究所;2.中国石化西南油气分公司勘探开发研究院

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TE 122

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中石化科技部项目《龙门山前海相上组合油气成藏条件与区带评价》(编号P22073)《四川盆地下三叠统成藏条件与有利区带评价》(编号P21042-5)联合资助


Sedimentary characteristics and reservoir formation mechanism of the 2nd member of Maokou Formation in the Longmen Mountain front zone of western SichuanXu Kang1、2 Wang Yuanzheng1、2 Jiang Xiaoqiong1、2 Zhang Zhuang3 Meng Xianwu3 Pan Wenlei1、2 Gong Hanning1、2
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Wuxi Research Institute of Petroleum Geology,SINOPEC

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    摘要:

    四川盆地茅口组近年来多项勘探突破展现了较好的资源潜力.研究川西龙门山前带茅口组二段沉积特征及储层形成机制对下步油气勘探具指导意义.以野外剖面、钻井、测井及地震资料为研究对象,利用岩心观察、常规及铸体薄片鉴定和孔渗测试等手段对川西龙门山前带栖霞组沉积及储层特征进行了分析,并探讨了储层形成机制.研究表明:川西龙门山前带茅口组二段地层呈北西—南东向发育。龙门山南段和中段为茅二下亚段内缓坡边缘高能砂屑生屑滩发育区。茅二上亚段龙门山中段和北段发育高能云化台缘砂屑生屑滩。茅二上亚段储层岩性为残余生屑砂屑白云岩、含生屑晶粒白云岩和残余晶粒白云岩。茅二下亚段储层岩性主要为残余砂屑白云岩和残余晶粒白云岩。储集空间类型包括晶间溶孔、粒间溶孔、粒内溶孔及扩溶缝洞。茅二段整体为中薄层中低孔渗的Ⅱ、Ⅲ类孔隙型储层。高能滩相沉积构成储层发育的基础。准同生期大气淡水淋滤溶蚀作用是储层形成的关键。浅埋藏期白云石化作用使储层得以改善和保持。

    Abstract:

    In recent years, multiple exploration breakthroughs have been made in the Maokou Formation of the Sichuan Basin, demonstrating good resource potential.Studying the sedimentary characteristics and reservoir formation mechanism of the 2nd member of the Maokou Formation in the front of the Longmen Mountains in western Sichuan has guiding significance for future oil and gas exploration.Based on field profiles, drilling, logging, and seismic data, this study analyzed the sedimentary and reservoir characteristics of the Qixia Formation in the front of the Longmen Mountains in western Sichuan using methods such as core observation, conventional and cast thin section identification, and pore permeability testing, and explored the mechanism of reservoir formation.Research shows that the 2nd section of the Maokou Formation in the front of Longmen Mountain in western Sichuan develops in a northwest southeast direction.The southern and middle sections of Longmen Mountain are the development areas of high-energy sand debris shoals on the gentle slope edge of the lower sub section of the second section of Maokou Formation.The middle and northern sections of the Longmen Mountain in the upper sub section of the second section of the Maokou Formation develop high-energy dolomitized platform edge sand debris shoals.The reservoir lithology of the upper sub section of the Maokou Formation consists of residual bioclastic sandstone dolomite, bioclastic grain dolomite, and residual grain dolomite.The reservoir lithology of the lower sub section of the second section of the Maokou Formation is mainly composed of residual sandstone dolomite and residual grain dolomite.The types of storage spaces include intergranular dissolution pores, intergranular dissolution pores, intragranular dissolution pores and expansion fracture pores.The second section of the Maokou Formation is a type II and III porous reservoir with medium to thin layers and low porosity and permeability.The high-energy beach sedimentation forms the basis for reservoir development.The leaching and dissolution of atmospheric fresh water during the quasi contemporaneous period is the key to reservoir formation.The dolomitization during shallow burial period improved and maintained the reservoir.

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康,汪远征,蒋小琼,等. 川西龙门山前带茅口组二段沉积特征及储层形成机制[J]. 科学技术与工程, , ():

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  • 收稿日期:2024-04-18
  • 最后修改日期:2024-05-11
  • 录用日期:2024-06-05
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