摘要
为助推天然气高效勘探,本文针对鄂尔多斯盆地西缘北段奥陶系成藏地质条件开展研究。在揭示了地层构造、沉积演化等基础地质特征的基础上,利用烃源岩地球化学测试等资料梳理了成藏地质条件,并根据生、储、盖配置关系提出了相应的成藏模式。奥陶系烃源岩以泥质岩型为主,白云岩、石灰岩、页岩均可作为储集层。天然气成藏模式主要可划分为:深海平原页岩源内自生自储式、大陆斜坡浊积灰岩源内自生自储式、碳酸盐台地灰岩近源上生下储式、碳酸盐台地白云岩远源上生下储式。根据完钻井资料,研究区内成藏模式以深海平原页岩源内自生自储式为主,是下步天然气勘探的重点目标。
In order to boost the efficient exploration of natural gas,this paper studies the geological conditions of Ordovician gas accumulation in the north section of the western Ordos Basin.The basic geological characteristics such as geologic structure and sedimentary evolution are revealed.Based on the data of reservoir characteristics and geochemical testing of source rocks,the geological conditions of Ordovician gas accumulation are sorted out.According to the spatial distribution of source rock,reservoir and cap rock,the corresponding natural gas accumulation model is proposed.The Ordovician source rocks are mainly argillaceous rocks,and dolomite,limestone and shale can be regarded as reservoirs.Natural gas accumulation modes can be divided into,model of self-generated and self-stored within the source in the deep-sea plain shale,model of self-generation and self-storage within the source of the continental slope turbidite limestone,model of upper-generation and lower-storage near the source in the carbonate platform limestone and model of upper-generation and lower-storage far from the source in the carbonate platform dolomite.According to the drilling data,the model of self-generated and self-stored within the source in the deep-sea plain shale is the main gas accumulation mode in the study area,which is the key target of the following natural gas exploration.
作者
李佐有
谢非
胡天宝
陈琳
车新凯
LI Zuoyou;XIE Fei;HU Tianbao;CHEN Lin;CHE Xinkai(Ningxia Hui Autonomous Region Nuclear Geological Survey Institute,Yinchuan Ningxia 750021,China;Oil Production Plant 11 of PetroChina Changqing Oilfield Company,Qingyang Gansu 745000,China;Northwest University,Department of Geology,Xi'an Shaanxi 710069,China)
出处
《石油化工应用》
CAS
2024年第1期73-78,共6页
Petrochemical Industry Application
关键词
鄂尔多斯盆地西缘
奥陶系
天然气藏
成藏模式
western Ordos Basin
Ordovician
natural gas reservoir
gas accumulation model
作者简介
李佐有(1986-),男,工程师,主要从事鄂尔多斯盆地西缘地质调查工作。E-mail:343765915@qq.com。
