摘要
东河砂岩是塔里木盆地晚泥盆世—早石炭世一套穿时的岩石地层单元,是盆地重要的含油层系。应用层序地层学理论,以露头、钻井和地震资料为基础,分析了东河砂岩的地层展布模式、沉积前古地貌特征、砂岩发育期次、沉积环境演化和砂岩分布规律。结果表明,东河砂岩是海侵背景下从西南向东北,即依次由麦盖提斜坡、巴楚凸起向塔中凸起、塔北隆起超覆的沉积砂体;东河砂岩沉积前古地貌有两隆两凹的特征;由早到晚可划分为5期砂体。第1期砂体主要分布在麦盖提斜坡和巴楚凸起,第2期砂体主要分布在巴楚凸起和塔中凸起,第3期砂体主要分布在塔中凸起和塔北隆起,第4期砂体主要分布在塔北隆起,第5期砂体主要分布在塔北隆起及塔东低凸起周缘。东河砂岩的岩相主要有砂砾岩、粗砂岩、中砂岩和细砂岩,沉积环境主要为河口湾和滨岸环境。由于不同地区、不同期次砂体的沉积特征、储盖组合及成藏条件不同,对不同地区和不同期次砂体需采用不同的油气勘探对策。
Donghe sandstone is the diachronous stratigraphical unit from the Late Devonian to the Early Carboniferous and controls the distribution of hydrocarbon reservoirs in Tarim Basin. The evolvement of sedimentary conditions and distribution rules of Donghe sandstone were analyzed by applying the sequence stratigraphic theory, according to the data of outcrops, drilling and seism. The sedimentary pattern was resulted from overlapping of Tazhong Uplift and Tabei Uplift under the condition of transgression. The sed- imentation of Donghe sandstone can be divided into five periods. The sediment of sandstone in the first period distributes in Maigaiti Slope and Bachu Uplift. The sediment of sandstone in the second period is mainly in the low heave of Bachu Uplift and Tazhong Uplift. The sediment of sandstone in the third period is mostly in the Tazhong Uplift and Tabei Uplift. The forth sediment of sandstone is in Tabei Uplift, and the fifth one distributes mainly in Tabei Uplift and around the periphery of Tadong Low Uplift. The Donghe sandstone bodies have various lithofacies such as glutenite, gritstone, medium-sandstone and fine-sandstone. The sedimentary environment mainly include shore and river estuary. The sandstone bodies in the different period differ from each other in sedimentary characteristics of reservoir-seal combination and pool-forming conditions. The different patterns of hydrocarbon exploration should be taken in the different sediment period of sandstone bodies and different areas.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2009年第6期835-842,共8页
Acta Petrolei Sinica
基金
国家"十五"重点科技攻关项目(2004BA616A02-04-02-04)资助
关键词
塔里木盆地
泥盆系
石炭系
东河砂岩
沉积期次
沉积环境
Tarim Basin
Devonian System
Carboniferous System
Donghe sandstone
sedimentary period
sedimentary environment
