准噶尔盆地西北缘中拐—五八区二叠系碎屑岩沉积相特征  

Sedimentary Facies of Permian Clastic Rocks in Zhongguai-Wuba Area in Northwestern Margin of Junggar Basin

作　　者：李兵[1,2] 党玉芳[3] 贾春明[3] 史基安[1] 张顺存[1] 

机构地区：[1]中国科学院油气资源研究重点实验室,甘肃兰州730000 [2]中国科学院研究生院,北京100049 [3]新疆油田公司勘探开发研究院地球物理研究所,新疆乌鲁木齐830013

出　　处：《天然气地球科学》2011年第3期432-439,共8页Natural Gas Geoscience

基　　金：国家科技重大专项(编号:2008ZX05001-006)资助

摘　　要：准噶尔盆地西北缘中拐—五八区是有利的石油勘探区带,沉积相空间分布对油气勘探具有重要的控制作用。结合该区二叠系的钻井、测井以及录井等资料的分析,认为准噶尔盆地西北缘中拐—五八区二叠系是在石炭系发育的火山岩基底上沉积的一套碎屑岩地层,沉积环境由冲积扇、扇三角洲组成,发育扇根、扇中、扇端、扇三角洲平原、扇三角洲前缘及前扇三角洲等6类亚相,每种亚相具有不同的沉积特征,还可以划分出不同的微相。基于沉积相的空间展布,认为该区物源主要来自西部红车逆冲断裂带附近的中拐凸起,物源组分为火山碎屑。并且由于构造隆升的阶段性,该区从佳木河组一直到夏子街组发育时期,沉积范围由下段到上段逐渐向东部玛湖凹陷萎缩,表现为湖盆沉积基准面下降,可容纳空间减小;而在乌尔禾组发育时期,湖盆水域扩大,沉积基准面上升,整个地区接受了统一的沉积。由于该地区构造—沉积作用的独特性,对该区不同类型的油气藏的成藏过程具有较好的控制作用,是今后油气勘探的重点区带。The northwest margin of Junngar basin as a continental foreland-basin exists the profitable target of oil and gas.The sedimentary facies space is important for oil and gas exploration.The Permian clastics at the tope of Carboniferous volcanic in the Zhongguai-Wuba area at the northwest margin of Junngar basin is identified by logging data.By means of well logging,mud logging and rock slices,the sedimentary environment is divided alluvium and fan-delta,and subdivided into fan-root,fan-bosom,fan-edge,fan delta plain,fan delta foreside,and frontal fan delta.Each sub-facies consist into several micro-facies.Based on the sedimentary facies space,we consider that the deposits would be sourced from volcanic rocks in the Zhongguai bulge near the western part of the Hongche thrust faulting belt.The phase of tectonic uplift caused the sedimentary scope shrunk gradually from lower segment to upper segment during the Jiamuhe and Xiazijie Periods.At the Wuerhe Period,the spread of water area and depositional base level rise caused continues deposition.The unique character of the structure and sedimentation in this area formed the preferable targets of oil and gas accumulation in the future exploration of oil and gas.

关 键 词：沉积相 有利区带 中拐—五八区 准噶尔盆地西北缘 

分 类 号：TE122.221[石油与天然气工程—油气勘探]