The Microfacies Combination and Character istics of Delta Front in Yanchang Formation (Triassic) of Jiyuan Area Shaanxi-Gansu-Ningxia Basin
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摘要: 以陕甘宁盆地姬塬地区晚三叠系延长统为例,将该区的三角洲前缘划分为“台型前缘”和“坡型前缘”两部分,其识别标志是以水下分流河道、复合河口坝(坝上河)和河口坝三种主要沉积微相为主导的多种微相的不同组合。文中对三角洲前缘中的沉积微相组合进行了精细划分和描述,例如,将水下分流河道划分为截削式和叠加式2种,将河口坝划分为完整式和复合式两大类,其中复合式河口坝(坝上河)还可划分为下残坝上河、完整坝上河和上残坝上河三种亚类型。这种对三角洲前缘的详细解释以及对其沉积微相的精细描述有助于优质储层的鉴别和分布预测,对油藏开发中的细分流动单元也有所帮助。Abstract: A series of gentle slope delta are developed in Yanchang Formation in Jiyuan Area of Shaanxi-Gansu-Ningxia Basin. The delta front in this area can be divided into mesa delta front and slop ing delta front. The deposition models of delta along gentle slop are proposed based on the strength of the current in distributary channel and the depth of water in the lake. According to the research of underwater distributary channel, recombination bars and mouth bar, we can establish the assorted scheme and discriminating characteristics. For example, the distributary channels are composed of truncated underwater distributary channels and underwater superposition channels. The rivermouth bars are composed of the integrated mouth bars and recombination bars. The recombination bars consist of mouse bars at the bottom and underwater distributary channels at the top, and it can be subdivide into up side deformity recombination bars, integral recombination bars and downside recombination bars. This type of compartmentation scheme can be helpful to identify and distributing prognosticate of high quality reservoir, and it can also serve to subdivide the flow unit in oil exploitation.
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[1] 1 吴崇筠,薛叔浩. 中国含油气盆地沉积学[M].北京:石油工业出版社,1992.48-56.
2 Frideman G M,Sanders J E. Principles of Sedimentology[M].New York:John Wiley & Sons,1978.5-121.
3 Haszeldine R S. Muddy deltas in freshwater lake, and tectonism in the Upper Carboniferous coalfield of NE England[J].Sedimentology,1984,(06):811-822.
4 梅志超. 湖泊三角洲的地层模式和骨架砂体的特征[J].沉积学报,1991,(04):1-8.
5 何义中,郑荣才,吴朝容. 湖泊三角洲研究的回顾与展望[J].岩相古地理,1999,(03):40-41.
6 杨俊杰. 鄂尔多斯盆地构造演化与油气分布规律[M].北京:石油工业出版社,2002.104-108.
7 马正. 应用自然电位测井曲线解释沉积环境[J].石油与天然气地质,1982,(01):25-40.
8 薛叔浩. 湖盆沉积地质与油气勘探[M].北京:石油工业出版社,2002.221-230.
9 陈钟惠. 煤和含煤岩系的沉积环境[M].武汉:中国地质大学出版社,1988.102-106.
10 梅志超. 沉积相与古地理重建[M].西安:西北大学出版社,1994.86-95.
11 周丽清,吴胜和,熊琦华. 吐哈盆地WM油田辫状河三角洲前缘砂体分析[J].沉积学报,2000,(02):248-252.
12 李凤杰,王多云,郑希民. 陕甘宁盆地华池地区延长组缓坡带三角洲前缘的微相构成[J].沉积学报,2002,(04):582-586.
13 王多云,陈应泰,徐洪生. 受周期性湖平面升降控制的冲积扇-扇三角洲沉积体系:柴达木盆地阿尔金山前西段干柴沟组[J].沉积学报,1991,(04):43-48.
14 李凤杰,王多云,宋广寿. 陕甘宁盆地坳陷型湖盆缓坡带三角洲前缘短期基准面旋回与储层成因分析[J].沉积学报,2004,(01):75-76. -
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