Unifying Division of Sequence Stratigraphy Unit and Framework Sequence Stratigraphy of Erlian Basin
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摘要: 在剖析二连盆地层序地层学研究现存问题的基础上，将构造地层学、成因地层学和层序地层学的理论、方法结合起来，把具有区域对比意义的盆地世代界面和盆地原型界面分别作为一级层序和二级层序的界面，把盆地(或凹陷)原型的每一个裂陷-反转旋回(亚原型)作为三级层序，把沉降-充填单元作为四级层序，尝试在构造-地层格架约束下进行层序地层格架分析，而在层序地层格架约束下进行成因地层格架分析.其优点是既吸取了经典海相层序地层学的等时地层界面、层序旋回和可容空间分析等精髓，又摒弃了不适合陆相裂陷盆地的海平面升降变化及体系域等部分内容，便于建立全盆地统一的层序地层格架，也便于揭示各层序地层单元的沉积特征、沉积演化史和不同构造岩相带的油气成藏条件，有助于提高对有利储集相带和有利储集体分布规律及其区域性差异的认识，进而有助于建立有指导意义的成藏预测模式.通过二连盆地各凹陷的实际分析，建立了可对比的、有规律可循的、统一的分级层序界面系统及层序地层格架.Abstract: Based on analyzing the previous problems relative to sequence stratigraphy researches on Erlian basin, this paper associated with the theories and methods of tecto-stratigraphy, genetic stratigraphy and sequence stratigraphy.We take the boundaries of basin generation and boundaries of basin prototype with regional correlative significations as first-order and second-orders in the scenario of framework sequence stratigraphy. And every cycle (para-type basin) representing rift and tectonic inversion within basin (or depression) type is divided as third-order sequences, and the subsidence-filling unit as fourth-order sequences. This paper is to analyze sequence stratigraphic framework based on the restriction of tectonic-sedimentation, and to analyze genetic stratigraphic framework under sequence stratigraphic framework. The merits in the scenario of framework sequence stratigraphy are that it inherits the analysis of chronostratigraphic boundary, sequence cycle and accommodation within marine sequence stratigraphy, and abandon part component of sea-level change and systems tracts in marine setting that are unsuitable in continental rift basin. Such scenario is convenient to construct the unifying sequence stratigraphic framework abroad entire basin, and to express sedimentary characteristics and developments of every sequence stratigraphic unit as well as hydrocarbon pool forming conditions located on different structure-lithofacies zones. In the meantime, this scenario will help to promote cognizing distributions and regional differences of favorable reservoirs and their facies belts so as to establish the significant model of hydrocarbon pool formation and accumulation. Based on practical analyses in all sags within Erlian basin, this paper has constructed correlative, obviously disciplinary and unifying boundary-ordered systems and correlative sequence stratigraphic framework.
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图 1 内蒙古自治区二连盆地各凹陷分布
Ⅰ.马尼特坳陷；Ⅱ.乌兰察布坳陷；Ⅲ.川井坳陷；Ⅳ.苏尼特隆起；Ⅴ.乌尼特坳陷；Ⅵ.腾格尔坳陷
Fig. 1. Location of each sags in the Inner Mongolian Erlian basin
图 2 以构造-地层格架分析为主线的格架层序地层学建模思路(吴冲龙等，2009)
Fig. 2. Sequence stratigraphic model based on the structure-stratigraphy framework analysis
图 3 二连盆地各凹陷统一层序地层单元划分方案(以洪浩尔舒特凹陷为例)
Fig. 3. Scheme for the sequence stratigraphic unit recognition in the Erlian basin
图 4 陆相盆地(凹陷)裂陷旋回的沉降-充填单元的结构与成熟度演化模式(吴冲龙等，2009)
Fig. 4. Subsidence-filling unit configuration in the rifting cycle of continental basin (sag) and its maturity evolution pattern
图 5 洪浩尔舒特凹陷地震剖面下白垩统超层序中的裂陷旋回(大层序)和沉降-充填单元(层序)划分示例
Fig. 5. Example showing how to recognize rifting cycle (large sequence) and subsidence-filling unit (sequence) in the Lower Cretaceous large sequence group from seismic section of Honghaoershute sag
图 6 洪浩尔舒特凹陷下白垩统下部裂陷旋回(大层序)中的沉降-充填单元(层序)划分示例(沉积相剖面由韩春元绘)
1.扇三角洲前滑积浊积砂；2.扇三角洲浊积砂体；3.辫状河三角洲水下分流河道砂；4.辫状河三角洲前滑积浊积砂；5.扇三角洲水上分流河道；6.扇三角洲水下分流河道；7.扇三角洲前缘席状砂体；8.火山岩及火山碎屑岩；9.滨浅湖沉积；10.较深湖沉积
Fig. 6. Example showing how to recognize rifting cycle (large sequence) and subsidence-filling unit (sequence) in the early Lower Cretaceous of Honghaoershute sag (sedimentional profile design by Han)
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