徐家围子断陷构造地质特征研究新进展

The new progress of Xujiaweizi fault depression characteristics of structural geology research

在徐家围子断陷深层连片三维地震精细解释的基础上,结合前人的研究成果,系统的刻画了深大断裂的性质、产状和时空分布规律。从区域构造应力场着手,详细剖析了徐家围子断陷的构造地质特征,重新构建了深大断裂体系。依据剖面特征和断陷的地质结构,首次在徐家围子断陷内解释出两条深大走滑断裂带,发现深大走滑断裂控制了营城组火山岩的形成和分布。明确了徐家围子断陷"两凹夹一隆、东西分带、南北分块"构造格局的动态演化过程及其控制因素。详细剖析了断陷期地层的沉积发育过程、后期改造过程以及现今赋存特征。为庆深气田火山岩储层分布规律预测奠定了基础。

On the basis of Xujiaweizi fault depression lace three-dimensional seismic fine interpretation,combined with previous research results,describes the deep faults' nature,occurrence,time-space distribution in system.Proceed from regional tectonic stress field,analyses the structural geological characteristics in detailed,rebuilds the deep zone fault system.Based on profile characteristics and faulted geological structure,it' s the first time to explain the two deep and large strike-slip fault zones in Xujiaweizi depression, and find that deep and large strike-slip fault control the formation and distribution of Yingcheng Formation volcanic rocks.It' s also the first time to make the Xujiaweizi fault depression'folder a long two concave,east and west sub-zone,north and south sub-block'tectonic framework of the dynamic evolution process and its controlling factors clearly.The analysis of the faulted sedimentary strata development,the late occurrence of the transformation process and the characteristics of the present in detailed,which is a good foundation to forecast the volcanic gas reservoirs distribution in Qingshen gas field.