新疆东北部三塘湖盆地马朗凹陷西山窑组层序地层格架及沉积相预测

Sequence Stratigraphic Framework and Sedimentary Facies Prediction of the Xishanyao Formation in the Malang Sag,Santanghu Basin,Northeastern Xinjiang

综合应用岩芯、测井、三维地震等资料,对新疆东北部三塘湖盆地马朗凹陷西山窑组层序地层特征及沉积相进行系统研究。结果表明,西山窑组共识别出3个三级层序界面,将西山窑组分为2个三级层序(SQ1、SQ2),识别出4种主要的沉积体系:即辫状河三角洲、辫状河、冲积扇及湖泊沉积体系。在层序格架内,应用属性分析、频谱分解等技术对马朗凹陷主要勘探层系西山窑组SQ1层序低位域砂体的分布进行刻画,并以此为依据,进一步研究了马朗凹陷SQ1层序低位域沉积相的平面展布特征及演化规律,最终建立了该时期沉积发育模式,为油田的勘探开发提供了地质依据。

Based on data of log, core and 3D-seismic, the sequence stratigraphic features and sedimentary facies of the Xishanyao Formation in the malang sag, Santanghu basin, are studied. Three 3rd-order sequence interfaces are recognized in the member. The writers divide the target layer into two 3rd-order sequences, there are four kinds of sedimentary systems identified in the target layer, including braided delta, braided river, fan and lacustrine. Within the sequence stratigraphic framework. Studying on the sand distribution of SQ1 sequence of low system tract by seismic attribute analysis, frequence processing technology, and meanwhile, we researched the distribute of sendimentary facies and evolution on SQ1 sequence low system tract in the Malang sag. Finally the depositional model of SQ1 sequence of low system tract was built. And supplied to the geology proof on exploratory development of oilfield.