鄂尔多斯盆地北部S井区盒8上亚段砂岩气藏沉积微相研究  

Sedimentary microfacies of upper submember of 8th Member sandstone gas reservoir in the S well area,northern Ordos basin

作　　者：杜家满 赵永刚 张吉[3] 于明航 阴旭航 DU Jiaman;ZHAO Yonggang;ZHANG Ji;YU Minghang;YIN Xuhang(School of Geosciences and Engineering,Xi'an Shiyou University,Xi'an 710065,Shaanxi,China;Shaanxi Provincial Key Laboratory of Petroleum Accumulation Geology,Xi'an 710065,Shaanxi,China;No.4 Gas Production Plant,Changqing Oilfield Company,petrochina,Ordos 017300,Inner Mongolia,China)

机构地区：[1]西安石油大学地球科学与工程学院,陕西西安710065 [2]陕西省油气成藏地质学重点实验室,陕西西安710065 [3]中国石油天然气股份有限公司长庆油田分公司第四采气厂,内蒙古鄂尔多斯017300

出　　处：《矿产勘查》2024年第3期373-383,共11页Mineral Exploration

基　　金：国家自然科学基金项目“泥质纹层对致密砂岩油藏中构造缝垂向扩展的抑制机理”(42002176);中国石油天然气股份有限公司长庆油田分公司项目“苏东41-33区块剩余储量评价及稳产对策研究”(2022-12699)联合资助。

摘　　要：鄂尔多斯盆地北部(鄂北)S井区盒8段气藏属于致密砂岩气藏。目前该井区盒8上亚段作为主力层位之一已进入开采中后期,存在剩余气分布特征不清的问题,进一步开采难度较大。为解决此问题,综合利用动静态资料,对该层位开展沉积微相的精细研究。研究区盒8上亚段自下而上分别划分为盒8上1、盒8上2两个小层,通过沉积相标志以及测井相分析,识别盒8上亚段单井沉积微相发育特征,并在横向上对该井区内的沉积微相及其组合关系进行分析,最终确定该研究井区盒8上亚段的沉积微相平面展布特征。结果表明:研究区气藏范围内发育边滩、河道充填、废弃河道、堤岸(天然堤、决口扇)、河道间5种微相;边滩以及河道充填为主要的控砂微相类型;盒8上1小层的西北部分布较大规模边滩,东部零星分散,盒8上2小层的东南部零星分布有边滩,西部分布有较大规模。研究成果可为鄂北地区储层非均质性特征和剩余气藏分布预测提供地质依据。Well S area is located in the north of Ordos Basin,and the He 8 gas reservoir is a tight sandstone gas reservoir.At present,the main formation of upper submember of the He 8 in this well area has entered the middle and late stage of exploitation.In order to solve this problem,the sedimentary microfacies of this horizon is studied by comprehensive use of dynamic and static data.The upper submember of the He 8 in the study area is divided into two small layers,namely He 8 upper 1 and He 8 upper 2.The sedimentary microfacies development characteristics of the upper submember of He 8 in a single well are identified through sedimentological facies markers and logging facies analysis,and the sedimentary microfacies in the well area and their combination relationship are analyzed laterally,and the planar distribution characteristics of the sedimentary microfacies in the upper submember of He 8 in the study area are finally determined.The results show that there are five kinds of microfacies in the gas reservoir in the study area:edge beach,channel filling,abandoned channel,bank(natural levee,break fan)and channel interchannel.The main types of sand control microfacies are bank and river filling.In the upper 1 layer of He 8,there are large scale side beaches in the northwest and scattered scattered in the east.In the upper 2 layer of He 8,there are small scale side beaches in the southeast and large scale side beaches in the west.This study provides geological basis for analyzing reservoir heterogeneity and predicting residual gas reservoir distribution.

关 键 词：鄂尔多斯盆地 盒8上亚段 曲流河三角洲平原 边滩 河道充填 

分 类 号：P618.13[天文地球—矿床学]