断陷湖盆层序演化对储集体成因类型及构型的控制

SEQUENCE CONTROL ON TYPE AND ARCHITECTURE OF RESERVOIR BODY IN RIFT-SUBSIDENCE LAKE BASIN

赖生华 麻建明 孙来喜

Lai Shenghua Ma Jianming Sun Laixi

西南石油学院 油气藏地质及开发工程国家重点实验室, 四川 南充 637001 2. 中国石化 南方勘探开发公司勘探开发研究院, 昆明 650200

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Petroleum Institute of Southwest, Nanchong, Sichuan 637001, China 2. Research Institute of Petroleum Exploration and Production, Southern Branch, SINOPEC, Kunming, Yunnan 650200, China

断陷湖盆中层序发育、演化取决于相对湖平面(可容空间)的变化和沉积物供给。相对湖平面上升时,湖浪能量增加,湖水向物源方向推进,形成水进型扇三角洲,水进滩坝和滑塌型浊积岩体较发育;相对湖平面下降时,湖水活动急剧减弱,河流能量增强,形成水退型扇三角洲,分流河道砂、砾岩体最为发育,同时也可形成高位滩坝砂、砾岩体和洪水型浊积岩体。在层序不同演化阶段,沉积环境的水动力能量状况有所不同,所形成的砂、砾岩体在平面上的构型有较大差异。

Sequence development and evolution are determined by relative lake level(accommodation) change and sediment delivery in rift-subsidence lake basin.When relative lake level rises,wave energy increases,lake water prograds toward source area,lake-transgression beach and bar and slumped turbidite increases and lake-transgression fan-delta is formed.When relative lake level dropps,wave energy decreases,fluvial energy increases,lake-regression fan-delta ias formed,sandstone and conglomerate of distributary river course develop,and beach and bar of HST and flood turbidite are formed.Because that hydrodynamic force energy of sedimentary environment in different stages of sequence evolution is different,distribution of sandstone and conglomerate is different.

油气藏地质及开发工程国家重点实验室资助项目(PLN0404)。

https://doi.org/10.11781/sysydz200504360