二连中生代盆地群构造地质特征与油气

CHARACTERISTICS OF TECTONIC GEOLOGY AND HYDROCARBON FOR MESOZOIC ERLIAN BASINS

王冰

Wang Bing

地球物理勘探局解释中心

Bureau of Geophysical Exploration, Ministry of Petroleum Industry

二连中生代盆地群基底为晚古生代褶皱带,在西伯利亚与中朝古板块多次裂解和闭合过程中分裂出众多的"古地体"。中、下石炭统及下二叠统为陆表海建造,在总体为韧性褶皱带中包裹有"脆性地块",故其刚度不一,且固结程度低,对中生代陆相盆地的形成具有深刻影响。中生代本区未形成统一的汇水盆地,盆岭结构显著,以盆地群面貌出现。经历了挤压隆升、拉张裂陷和挤压抬升三个演化阶段。断陷发育的伸展率仅达20%,后改造作用强烈。盆地(断陷)可分为同生与后生二大类六个亚类,二级构造带可分为七种成因类型,它们各具不同的演化历史,对油气的生成、聚集、保存具有明显差异。

The basement of Mesozoic Erlian basins is a fold of late Palaeozoic.Numerical palaeo-terrains were separated duing several cleavages and closures between Siberia and Sino-Korea palaeo-plates;and epicontinental sea sedimentation was dominant in middle and lower Carboniferous and lower Permian.On the whole,there were brittle masses enveloped in ductile folding belts with different rigidities and low consolidation.It was very influential on the formation of Mesozoic continental basins.No centralized catch basin appeared during Mesozoic,but the basin-range structures in the form of basin group were marked.During the evolutional stages of comp-ressional rising,stretching rifting deppression and compressional rising,the stretching rate of faulted subsidence was only about 20%,while the violent remoulding took place in later period,and basins(faulted subsidences)can be divided into two types and six subtraps.Seven original types were recognized for secondary structural belts with different evolutional histories,resulting in differences in the generation,accumulation and preservation of hydrocarbons.

https://doi.org/10.11781/sysydz199001008