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通过典型单井岩心相分析、单井层序地层学分析,结合各三级层序砂岩厚度平面展布图、砂岩含量百分比平面展布图,开展了西山窑组各三级层序沉积体系展布特征研究;以不同沉积相带储集物性为基础,结合主要砂体体系时空分布特征,预测有利储集相带。结果表明:焉耆盆地博湖坳陷西山窑组主要发育南北2大物源体系,在西北部和北部主要发育辫状河三角洲相,南部则主要发育湖泊-扇三角洲沉积;西山窑组下段沉积期研究区存在北部凹陷本布图辫状河三角洲复合体、南部凹陷库代力克扇三角洲砂体和凹陷西部的巴州煤矿辫状河三角洲复合体;西山窑组中段沉积期,南部凹陷库代力克扇三角洲砂体发育规模更大,向湖延伸更远,而巴州煤矿方向物源基本消失,北部凹陷本布图辫状三角洲复合体变化不大;西山窑组有利储集相带是分布在三角洲平原亚相的河道砂体和前缘的河口坝砂体,较有利储集相带分布在三角洲前缘亚相的远砂坝沉积和前三角洲沉积,凹陷北缘的宝北和西端的四十里城为两大主要的有利储集相带的主要分布区,南缘的库代力克也发育有一定规模的有利储集相带和较有利储集相带。
Through the typical single-well core facies analysis and single-well sequence stratigraphy analysis, combined with the thickness distribution map of sandstone and the percentage distribution of sandstone content, Based on the reservoir property of different sedimentary facies belt and the spatial-temporal distribution characteristics of the main sand body system, the favorable reservoir facies belt is predicted. The results show that the Xishanyao Formation in the Bohu Depression of Yanqi Basin mainly consists of two major source systems of north and south, mainly braided river delta in the northwest and north, lake-fan delta deposition in the south, and sedimentary period in the lower part of Xishanyao Formation The braided delta complex in the northern depression, the Braided River delta complex in the southern depression, the Brazier Delta complex in the Bashang Lectra fan delta in the southern depression and the western part of the depression, the depositional period in the middle segment of the Xishanyao Formation, The delta sand body is larger in scale and extends farther to the lake, while the source of the Bazhou coal mine basically disappears. The braided delta complex in the northern depression has little change. The favorable reservoir facies belt of the Xishanyao Formation is distributed in the delta The fluvial sand bodies in the subfacies of the plains and the mouth bar bodies of the mouth of the front are more favorable reservoirs than the far-bar sediments and the former delta sediments distributed in the delta front subfacies. Forty The inner city is the main distribution area of the two major favorable facies belts. The southern margin of the Kunde Lectra also develops favorable scale facies and favorable facies belts.