塔里木盆地塔中地区寒武—奥陶系沉积特征及构造控制

THE CAMBRIAN-ORDOVICIAN SEDIMENTARY FEATURES AND STRUCTURAL CONTROL IN THE CENTRAL TARIM AREA

盆地地理的变革和沉积环境的演化均受盆地构造性质、构造活动的控制。在塔里木盆地塔中地区构造背景基础上细致分析了寒武、奥陶系沉积特征,指出其沉积相具有典型的分层结构,纵向上总体反映了海平面的持续上升过程,塔中隆起主体由下部的蒸发台地相、局限台地相、开阔台地相,向上逐渐变为台地边缘相、浅水陆棚相、混积陆棚相及斜坡相等;同时探讨了塔中地区构造活动对沉积地层的控制作用,指出构造隆起对烃源岩发育、构造断裂对上覆地层沉积特征以及构造古地貌对地层超覆沉积分别都具有不同的控制作用。这些对研究本区的储层发育、分布特征以及预测有利的储集相带等都有积极的作用。

In geological history, the geography transform and sediment environment evolvement of a basin is controlled by its structural characteristics and structural movement. This paper analyzed the sedimentation of the Cambrian-Ordovician based on the structural background of the central Tarim area, Tarim Basin. Its sedimentary facies are representative of stratification in vertical, which reflect the persistent rise process of sea level on the whole. The sedimentary facies gradually evolve upwards from evaporate platform, localized platform and widen platform to platform edge, shallow shelf, mixture shelf and slope facies in the main area of the Central Tarim Uplift. Moreover, the control actions of structurd movements to stratum sedimentation were discussed in this paper. Researches show that structure uplift to the development of hydrocarbon source rock, structure fractures to the features of overlaying stratum alion and structure palaeogeomorphology to stratum overlap sediment have differentation control actions.