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Sequence stratigraphic characteristics and subtle-trap exploration of the sagged lacustrine basins

机译：下陷湖相盆地层序地层特征与含油气圈闭勘探

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摘要

The sagged lacustrine basins are widely distributed in China. Three types of sagged lacustrine basins are classified on the basis of geologic settings of basin formation. (1) The sagged basins are developed on former rifted basins, such as the Songliao basin; (2) the sagged basins like the Ordos basin evolved on the basis of paleo-cratonic basins; and (3) the sagged basins, such as the Junggar basin, developed from the Late Paleozoic marine-basin closing. The Mesozoic sagged lacustrine basins are one of the most important oil-bearing basin types in China. Terrigenous clastic sediments of the sagged lacustrine basins are supplied by fluvial and alluvial fan systems around the basins. Delta systems concentrate on one depocenter or several depocenters. Lacustrine basins are alternately filled with regressive and transgressive depositional intervals. The lacustrine mudstones deposited during maximum flooding periods are important source rocks and regional seal beds. The sandstone bodies interbedded with the mudstones deposited two maximum flooding periods are most important targets for searching for the subtle traps. There are many higher-order cycles of lacustrine level changes between two major maximum flooding periods. Such frequent changes of lacustrine level and sediment supply result in shoreline migrating and delta-lobe shifting. Thus, delta front belts become favorable areas of searching for lithologic oil reservoirs. The subtle oil reservoirs in the sagged lacustrine basins are generally characterized by wide distribution, low permeability, and low richness, which may form high-accumulative and high-productive blocks due to matching with favorable structural settings. The Qingshankou, Yaojia, and Nenjiang (QYN) oil-bearing interval in the Songliao basin can be illustrated as one typical example.
机译：下陷的湖盆在中国分布广泛。根据盆地形成的地质背景，将三种类型的下陷湖盆盆地进行了分类。 （1）下陷盆地是在松辽盆地等以前的裂陷盆地上发育的； （2）鄂尔多斯盆地等凹陷盆地是在古克拉通盆地的基础上演化而来的； （3）下古生代海盆封闭发育的下陷盆地，如准gar尔盆地。中生代凹陷湖泊盆地是中国最重要的含油盆地类型之一。凹陷湖盆盆地的陆源碎屑沉积物由盆地周围的河流和冲积扇系统提供。三角洲系统专注于一个或多个沉积中心。湖盆盆地交替地充满了渐进和渐进的沉积层段。在最大洪水时期沉积的湖相泥岩是重要的烃源岩和区域性封闭层。寻找最细微的圈闭的最重要目标是与沉积有两个最大洪水期的泥岩夹层的砂岩体。在两个主要的最大洪水时期之间，湖泊水位变化有许多高阶循环。湖水位和沉积物供应的这种频繁变化会导致海岸线迁移和三角波偏移。因此，三角洲前带成为寻找岩性油藏的有利区域。凹陷湖盆中微妙的油藏通常具有分布宽，渗透率低和富集度低的特点，由于与有利的构造环境相匹配，可能形成高积聚，高产的区块。一个典型的例子就是松辽盆地的青山口，姚家和嫩江（QYN）含油层段。

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