砂质碎屑流典型特征及识别标志  

Typical Characteristics and Identification Marks of Sandy Debris Flow

作　　者：肖子洋 黄传炎[1,2] 谢通[1,2] 李邦勇 李媛[1,2] 

机构地区：[1]构造与油气资源教育部重点实验室,湖北武汉430074 [2]中国地质大学(武汉),湖北武汉430074

出　　处：《特种油气藏》2016年第2期45-49,153,共5页Special Oil & Gas Reservoirs

基　　金：国家自然科学基金"典型断陷富油气凹陷层序构成样式差异性研究"(40872077)

摘　　要：通过对北部湾盆地福山凹陷流沙港组一段岩心观察,理清砂质碎屑流沉积构造特征——发育丰富的块状构造和滑塌变形构造,可见大量泥砾;识别出岩性的垂向组合特征,由底至顶为含砾砂岩段—细砂岩段—泥岩段。从砂质碎屑流的定义、岩石学特征和流变学特征等3个方面出发,总结出砂质碎屑流的识别标志——大套块状砂岩顶部与泥岩突变接触,底部与含砾砂岩不整合接触,砂岩中泥质撕裂屑和漂浮泥砾现象丰富,滑塌变形构造十分发育。研究结论可为砂质碎屑流的研究以及深水沉积油气勘探提供科学依据。The core samples of Liushagang1 in Fushan Depression of Beibuwan Basin are observed to identify sedimentary-structural characteristics of sandy debris flow,which shows that abundant massive and slump deformation structures develop with a large number of mud-gravel. The vertical lithology combination is identified,including pebbly sandstone-fine sandstone-mudstone from bottom to top. The identification marks of sandy debris flow are provided according to the sandy debris flow definition,petrologic and rheological properties,including abrupt contact between the top of abundant massive sandstones and mudstone,unconformable contact between the bottom of abundant massive sandstones and pebbly sandstone,abundant argillaceous rig-up and mud-gravel in sandstone and well-developed slump deformation structures. Research could provide a scientific reference for the study of sandy debris flow and exploration of deep-water hydrocarbon deposition.

关 键 词：砂质碎屑流 深水沉积 漂浮泥砾 塑性流体 构造特征 福山凹陷 

分 类 号：TE121[石油与天然气工程—油气勘探] TE122