准噶尔盆地湖底扇沉积特征及地球物理响应——以克拉玛依油田五八区二叠系下乌尔禾组为例  

Sedimentary characteristics and geophysical responses of sublacustrine fan in the Junggar Basin:a case study on the Lower Urho Formation of the Permian in the Wuba block,Karamay oilfield

作　　者：吴涛[1,2,3] 赵长永[3,4] 吴采西[3] 苏艳丽[5] 周作铭[3] 张顺存[1] 史基安[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]中国科学院大学,北京100049 [3]中国石油新疆油田公司勘探开发研究院,新疆克拉玛依834000 [4]中国石油新疆油田公司勘探处,新疆克拉玛依834000 [5]中国石油新疆油田公司风城油田作业区,新疆克拉玛依834000

出　　处：《石油与天然气地质》2013年第1期85-94,共10页Oil & Gas Geology

基　　金：国家重点基础研究发展计划("973"计划)项目(2011CB201104);国家科技重大专项(2011ZX05000-01-06)

摘　　要：以准噶尔盆地克拉玛依油田五八区为例,综合利用岩心分析、薄片鉴定、分析化验和测井等资料,通过对二叠系下乌尔禾组湖底扇砂岩体岩石学、结构特征等方面的研究,认为下乌尔禾组湖底扇较发育,具有典型浊流沉积所形成的鲍马序列,沉积结构上也具有典型浊流沉积的粒度分布特征。地震正演模拟结果证实湖底扇具有敏感的地震响应。通过平均瞬时相位属性、相位调谐体频率切片、层拉平切片等地震多属性的刻画与储层反演,精细刻画砂体空间分布特征。湖底扇砂岩体地震剖面上具有典型的楔状杂乱反射、斜交反射以及透镜状反射特征。平面上南北向成群展布,分布范围广,砂泥岩配置关系良好,空间上呈透镜状展布。湖底扇砂岩体毗邻烃源岩,储盖组合良好,易形成岩性圈闭,油气成藏条件优越,对岩性油气勘探具有重要意义。Sublacustrine fans were identified firstly in the Junggar Basin through integrated methodology of geolo- gy and geophysics. Data gathered from core sampling, testing, logging, and 3D seismic analysis of the Wuba block in Karamay Oilfield of Juggar Basin, show that the fans develop well in the lower Urho Formation of the Permian in the area. Study on the sedimentary facies, petrology and texture reveals that the fans have Bouma sequence and grain size distribution typical of turbidite deposits. Forward seismic modeling confirms the sensitive responses of the fans. The spatial distribution of fans was finely described with several seismic technologies including seis- mic multi-attributes, spectrum decomposition and seismic slices. The sandbodies in the fans occur as chaotic re- flection, oblique reflection and lenticular reflection on seismic profiles. On plane view, they are widely distributed in clusters with good sandstone and mudstone combinations, while in space, they show lens shapes. These sand- stone reservoirs and source rocks are close and in good combination, favorable for forming litholohic traps. These fans bear great significance to the exploration of lithologic reservoirs in the region.

关 键 词：鲍马序列 浊流沉积 地球物理响应 湖底扇 下乌尔禾组 二叠系 克拉玛依油田 准噶尔盆地 

分 类 号：TE122.1[石油与天然气工程—油气勘探]