第40卷第1期
天然气勘操与开发
苏里格气田东区北部下二叠统山西组二县
段
沉积相研究
吴小宁1,2
地质勘探
李进步12朱亚军12杜康3罗文琴4黄丹12刘利峰12
1.中国石油长庆油田公司苏里格气田研究中心2.低渗透油气田勘探开发国家工程实验室
3.中国石油长庆油田公司第三采气厂4.斯伦灵谢长和油田工程有限公司
摘要下二叠统山西组二段（以下简称山，段）是鄂尔多斯盆地苏里格气田东区北部的重点兼探层系，近年开发实践中该区块北部已取得较好的开发效果，南部也表现出良好的开发前景，然面前人对其沉积相认识存在的分歧使储层展布规律研究及富集区预测难以有效进行。为此以现代沉积学理论为指导，综合岩心观察、薄片鉴定、测井曲线等资料，结合测井相研究及古生物标志，明确了山，段沉积微相类型及特征；在单并相及况积序列研究的基础上，结合沉积相连并剖面及砂地比特征，刻西了山一山，亚段沉积微相展市特征及时空演化。研究表明；①山，流积期研究区北部为辨状河沉积，主要发育心滩、辉状河道、泛溢平原、洪漫沼泽等沉积微相；②南部为曲流河沉积，主要发育边滩、河道充填、漫准、牛轭潮、决口扇等沉积微相；①山，一山，亚役沉积期北部辨状河与南部曲流河的分界位置由南往北整体迁移，该研究成果对该区储层展布规律及开发有利区预测其有指导意义，北部辨状河心滩与南部曲流河边滩是下一步气田开发的有利相带。
关键调鄂尔多斯盐地苏里格气田
沉积相曲流河
群状河
早二叠世
山西组
SedimentaryfaciesofShan,MemberofLowerPermianinnorthernEastBlockof
SuligeGasfield
WuXiaoning"”,Li Jinbu',ZhuYajun'2,DuKang,uo Wenqin',HuangDan',Liu Lifeng2
(1.SuligeGasfield ResearchCenter,PetroChinaChangqingOifield Company,Xi'an,Shaanxi710018,China; 2.National Engineering Laboratory of Low-permeability Oil & Gas Exploration and Development,Xi'an, Shaanxi 710018,China;3.No.3GasProductionPlant,PetroChina ChangqingOilfield Company,Xi'an,Shaanxi710018, China; 4. SCPOilfield Services Co.,Ltd,Xi'an, Shaanxi 710018,China)
Abstract: The second member of Shanxi Formation (°Shan, Member") of Permian is a key exploration strata in northern East Block of Sulige Gasfield. Development operations in recent years reveal better results in this area, and also promising performance in south-aeeaae disagreed understanding on the sedimentary facies, In this paper, types and characteristics of Shan, Member sedimentary microfacies aaeseaeoaasoea well as electrofacies analysis and palaeontologic marker. Then, distribution characteristics and time-space evolution of Shan,'-Shan, sedimentary microfacies were described based on single-well facies and sedimentary sequence analysis, combined with the well-tie subsections of sedimentary facies and the net/gross ratio characteristics. It is indicated that during the sedimentation of Shan, Member, it was braided river facies and the following sedimentary microfacies were mainly developed, e.g. channel bar, braided channel, flood plain and flooded swamp in the north of the study area. In the south, it was meandering river facies, and the following sedimentary mi-crofacies were mainly developed, e.g- point bar, channel fill, flood plain, oxbow lake and crevasse splay. In the period of Shan,'-Shan, subsections of sedimentation, the boundary between braided river facies and meandering river facies moved wholly from the south to the north. The study results play an instructive role in exploring the reservoir distribution laws and predicting favorable zones in this area. The channel bar of braided river in the north and the point bar of meandering river in the south are the favorable facies zones for the following development of Sulige Gasfield.
Keywords: Ordos Basin; Sulige Gasfield; Early Permian; Shanxi Formation; Sedimentary facies; Meandering river; Braided river; 基金项目：国家科技专项“雾尔多斯盆地大型低渗透岩性地层油气藏开发示范工程”（编号：2016ZX05050)。
第一作者筒介：吴小宁，1982年生，工程师，硕士；现从事油气田开发地质研究工作。地址：（710018）陕西省西安市未央区风城四路苏里格大厦。电话：（029）86978692。E-mail:wxngeo@qq.com
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