摘要
针对准噶尔盆地沙湾凹陷百口泉组层序地层格架及沉积体系认识不清的问题,运用层序地层学、沉积学综合研究的方法,借助地震多属性分析的手段,对沉积相展布特征进行研究,从而对有利区域进行预测。研究表明:百口泉组可划分出3个三级层序,各三级层序内部又可以根据碎屑沉积模式划分出湖进、湖退2种体系域;发育扇三角洲—湖泊沉积体系,分为扇三角洲平原、扇三角洲前缘以及滨浅湖3个亚相,进一步可分为5种微相;将有利区划分为3个等级,并认为埋深在5 000 m以内断层交错发育的扇三角洲前缘水下分流河道微相最为有利。该结论的提出可对下一步的勘探方向提供依据。
Aiming at the problem that the sequence stratigraphy framework and deposit systems of the Baikouquan Formation in the Shawan sag within the Junggar Basin arc not clear yet, we integrated the study methods of se- quence stratigraphy and sedimentology, applied multiple seismic attribute analysis method to study the distribution feature of the sedimentary facies, and then predicted the favorable regions. The study results show： （ 1 ） the Baik- ouquan Formation can be divided into three 3rd-order sequences, and the inside of each 3rd-m＇der sequence ean be classified into two system tracts （ lacustrine transgressive traet and lacustrine regressive tract） according to clastle deposit model; （2） there is fan delta-lacustrine deposit system that include three snbfaeies （tan delta plain, fan delta front and shore-shallow lake） and five mierofacies; （3） the favorable regions can be divided into three grades, and the underwater distributary channel mierofaeies in fan delta front with interlaced development of faults within burial depth of 5000 m is the most favorable. This conclusion can provide base for future exploration direction.
出处
《特种油气藏》
CAS
CSCD
北大核心
2017年第6期48-54,共7页
Special Oil & Gas Reservoirs
基金
中国石油"新疆大庆"重大科技专项"沙湾凹陷西斜坡多层系地层岩性油气藏勘探目标优选与关键技术"(2012E-34-01)
关键词
沉积相
层序地层格架
百口泉组
沙湾凹陷
准噶尔盆地
sedimentary facies
sequence stratigraphy fi＇amework
Baikouquan Formation
Shawan sag
Junggar Basin
