Late Jurassic – early Cretaceous inversion of rift structures, and linkage of petroleum system elements across post-rift unconformity, U.S. Chukchi Shelf, arctic Alaska
Late Jurassic – early Cretaceous inversion of rift structures, and linkage of petroleum system elements across post-rift unconformity, U.S. Chukchi Shelf, arctic Alaska
复制标题
晚侏罗世-早白垩世裂谷结构的反转，以及裂谷后不整合面石油系统元素的联系，美国楚科奇陆架，北极阿拉斯加
DOI：
10.5724/gcs.15.34.0724
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
C. Connors
中科院分区：
文献类型：
--
作者：
D. Houseknecht;C. Connors
美国楚科奇陆棚的盆地演化经历了晚泥盆世-二叠纪裂谷、二叠纪-早侏罗世凹陷、晚侏罗世-新comian反转和新生代前陆-盆地发育等多个阶段。正在进行的勘探的重点是一个石油系统，包括凹陷相烃源岩;反转相储集岩;跨越裂谷，凹陷和反转阶段的结构;和前陆盆地阶段的烃生成。对二维地震和稀疏井数据的解释表明，在大陆架的中南部，存在一系列雁行、南北走向的单克隆褶皱肢，显示出高达1公里（3,300英尺）的结构起伏。这些褶皱位于裂陷期正断层的尖端之上，被解释为最大压应力与裂陷期正断层走向斜交而形成的反转构造。侏罗纪不整合面上的侵蚀地貌、上覆上侏罗统至Neocomian地层中的生长地层以及反转构造以东高可容纳沉积中心中的东倾斜坡形表明了构造对沉积的深远影响。倾向于油的烃源岩、砂岩质砂岩、运移通道和构造闭合通过反映反转的侏罗纪不整合面紧密相连。因此，当三叠系烃源岩在白垩纪-新生代地层埋藏期间进入生油窗时，所有这些关键的含油气系统要素都已就位。CO PY钻机HT 20 15 G CS SE PM
Basin evolution of the U.S. Chukchi shelf involved multiple phases, including Late Devonian– Permian rifting, Permian–Early Jurassic sagging, Late Jurassic–Neocomian inversion, and Cretaceous–Cenozoic foreland-basin development. The focus of ongoing exploration is a petroleum system that includes sagphase source rocks; inversion-phase reservoir rocks; structure spanning the rift, sag, and inversion phases; and hydrocarbon generation during the foreland-basin phase. Interpretation of 2-D seismic and sparse well data documents the presence, in the south-central part of the shelf, of a series of en-echelon, north-south trending monoclonal fold limbs that display up to 1+ km (3,300 ft) of structural relief. These folds, which are located above the tips of rift-phase normal faults, are interpreted as inversion structures formed by maximum compressive stress oriented obliquely to the strike of rift-phase normal faults. Erosional relief on a Jurassic unconformity, growth strata in the overlying Upper Jurassic to Neocomian strata, and east-dipping clinoforms in a high accommodation depocenter east of the inversion structures indicate profound structural influence on sedimentation. Oil-prone source rocks, reservoir-quality sandstone, migration pathways, and structural closure are linked intimately across the Jurassic unconformity, which reflects inversion. Thus, all these key petroleum systems elements were in place when Triassic source rocks entered the oil generation window during Cretaceous–Cenozoic stratigraphic burial. CO PY RIG HT 20 15 G CS SE PM