新疆焉耆挤压逆冲型残留盆地与油气勘探

该文根据焉耆中生代原型盆地在燕山期和喜山期南强北弱的继承性挤压反转变形特征,由南向北划分了"南部滑脱推覆—中部逆冲褶皱—北部走滑调整"3个构造变形分区。其中,NWW向(近EW向)压性构造与NW向扭性构造交织,组成"菱形网格状"构造格局,控制了二级构造带和局部构造的展布特征。在原型盆地南、北凹陷构造-沉积分野的基础上,后期改造更一步强化了其分割性,形成了南、北古地温场分区和各自相对独立的油气系统。残留盆地具有独特的3种(挤压、走滑和拆离滑脱)基本变形风格,形成了不同的构造控油组合及油气聚集类型。依据残留盆地的改造类型及油气成藏特征,预测了北部凹陷"继承-再生型"和"改造-再生型"成藏单元,它们为近期拿储量的有利地区。 

THE YANQI COMPRESSIONAL-THRUST RESIDUAL BASIN IN XINJIANG PROVINCE AND ITS OIL-GAS EXPLORATION

In this article, the Yanqi Basin was divided into three structural deformation regions from south to north-southern decollement nappe region, central thrust folded region and northern strike-slip adjustment region according to the characteristics of inherited compressional inverse deformation getting strengthened from north to south in the Mesozoic Yanqi Prototype Basin during the Yanshanian and the Ximalayan periods. The compressional structures with NWW trend (close to EW trend) and the shear structures with NW trend crossed each other to form a "lozenge grid" structural pattern. The distribution features of secondary structural belts and local structures were controlled by this structural pattern. On the basis of structural and depositional distribution in the south and north depressions of the prototype basin, the zonation was further strengthened through paulopost reformation, and the north and south paleogeothermal field regions and the relatively independent petroleum systems were formed. In the residual basin, it created different oil-controlling structural combinations and different oil-gas accumulation patterns due to its three basic and unique deformation styles. Based on the reformation styles and pool-forming characteristics of the residual basin, it was predicted that the pool-forming units of "inheritance and regeneration" and "reformation and regeneration" in the northern depression were the favorable regions to discover reserves recently.