SEDIMENTARY MICROFACIES AND SAND-BODY DISTRIBUTION MODEL OF THE XISHANYAO FORMATION IN THE SHIXI AREA OF JUNGGAR BASIN
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摘要: 岩心观察结果及分析化验资料显示,在石西地区西山窑组沉积物中,砂岩成熟度较低,砂、砾岩中炭屑及炭化植物枝干较多,沉积构造以平行层理、交错层理为主,并识别出了双向交错层理。结合石西地区测井资料及岩心资料,对石西地区西山窑组沉积体系展开研究。研究表明,该区属于曲流河三角洲相沉积,发育3种亚相和10种微相:曲流河三角洲平原分流河道、决口扇、河漫泥、河漫沼泽;曲流河三角洲前缘水下分流河道、支流间湾、河口砂坝、远砂坝、水下天然堤;曲流河前三角洲泥。在沉积微相研究的基础上,对西山窑组的砂体展布进行了研究,砂体类型以水下分流河道、河口砂坝、分流河道、河漫沼泽为主,总结了各种沉积微相的测井响应特征,探讨了砂体展布规律,得出了砂体展布明显受控于沉积微相的结果。Abstract: Core description and laboratory data indicate that the sandstones of the Xishanyao Formation in the Shixi area are very immature. Charcoal and carbonized plant stems as well as parallel and trough like cross beddings are common in sand and gravel deposits. Through the multidisciplinary study of regional geological data, well logs and core description data, we discussed the sedimentary systems of the Xishanyao Formation in the Shixi area. The sequence suggests a facies of meandering river delta, consisting of three sub-facies and 10 microfacies including the deltaic plain, distributary channel, crevasse splay, flood plain, deltaic swamp, subaqueous distributary channel, tributary bay, mouth bar, distal bar, subwater natural levee, and prodelta. The sand-body distribution pattern of the Xishanyao Formation was discussed on the basis of sedimentary facies. Data indicate that the sequence is dominated by the sandstones of subaqueous distributary channel, mouth bar, distributary channel, and deltaic swamp. Logging responses of various sedimentary microfacies were studied in this paper. The results show that the distribution pattern of sand-bodies are obviously controlled by sedimentary facies.
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[1] Basic Geology
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