鄂尔多斯盆地DND气田马家沟组马五段小层划分探析  

Exploration and analysis of subdivision in member 5 of Majiagou Formation of DND gas field in Ordos Basin

作　　者：申荣荣 赵永刚 唐明远[3] 阴旭航[1,2] 杜家满 于明航 SHEN Rongrong;ZHAO Yonggang;TANG Mingyuan;YIN Xuhang;DU Jiaman;YU Minghang(School of Geosciences and Engineering,Xi'an Shiyou University,Xi'an,Shaanxi 710065,China;Shaanxi Provincial Key Laboratory of Petroleum Accumulation Geology,Xi'an Shiyou University,Xi'an,Shaanxi 710065,China;Exploration&Development Research Institute of Sinopec North China Oil and Gas Branch,Zhengzhou,Henan 450000,China)

机构地区：[1]西安石油大学地球科学与工程学院 [2]西安石油大学陕西省油气成藏地质学重点实验室 [3]中国石化华北油气分公司勘探开发研究院

出　　处：《录井工程》2024年第1期112-118,126,共8页Mud Logging Engineering

基　　金：国家自然科学基金项目“烃源岩早期产物对致密油充注聚集的控制机理研究”(编号:42072185);中国石油化工股份有限公司华北油气分公司项目“大牛地气田马家沟组古岩溶水系统研究”(编号:34550008⁃21⁃ZC0609⁃0017)。

摘　　要：鄂尔多斯盆地DND气田中奥陶统马家沟组自下而上划分为6段,其中马五段是该气田下古生界主要产气层,随着对DND气田马五段气藏的开发力度不断加大,马五6-马五10亚段的小层精细划分已日益迫切。为此在继承鄂尔多斯盆地中东部马五1-马五5亚段小层成熟划分方案的基础上,利用岩心、薄片、录井、测井资料针对研究区136口井的马五段尤其是马五6、马五7亚段进行亚段及小层的精细划分,寻找并确定标志层,利用对碳酸盐岩岩性敏感的光电吸收截面指数曲线区分石灰岩与白云岩地层,将自然伽马、自然电位、声波时差等多种测井响应结合识别碳酸盐岩岩性段。研究表明:目前可将马家沟组马五段划分出10个亚段和21个小层;马五6亚段“四分”,厚度范围为4.6~13.3 m,平均值8.8 m;马五7亚段“三分”,厚度范围为5.9~15.3 m,平均值9.8 m。马五6、马五7亚段小层精细划分在鄂尔多斯盆地尚属首次,将为DND气田及其他气田的马家沟组中组合气藏小层划分提供重要参考。The Majiagou Formation of the Ordovician in the DND gas field of the Ordos Basin is divided into six members from bottom to top.Among them,the Ma 5 member is the main gas producing layer in the Lower Paleozoic of the gas field.With the increasing development efforts of the Ma 5 gas reservoir in the DND gas field,the fine division of small layers in the Ma 56-Ma 510 subzone has become increasingly urgent.On the basis of inheriting the subzone division plan of Ma 51-Ma 55 in the central and eastern part of the Ordos Basin,this article uses core,thin section,mud logging,and well logging data to finely divide the subzone and small layers of Ma 5,especially Ma 56 and Ma 57,in 136 wells in the study area.The main task is to search for and determine the marker layer by using the photoelectric absorption cross⁃section index curve sensitive to carbonate rock lithology to distinguish between limestone and dolomite formations.Multiple logging responses such as natural gamma,natural potential,and acoustic time difference are combined to identify carbonate rock lithology sections.Currently,the Majiagou Formation Ma 5 member can be divided into 10 sub sections and 21 small layers;The Ma 56 subzone is divided into four parts,with a thickness range of 4.6⁃13.3 m and an average thickness of 8.8 m;The Ma 57 subzone is divided into three parts,with a thickness range of 5.9⁃15.3 m and an average thickness of 9.8 m.The fine division of subzone in Ma 56 and Ma 57 is the first time in the Ordos Basin,which will provide important reference for the subdivision of combined gas reservoirs in the Majiagou Formation of DND and other gas fields.

关 键 词：马家沟组 马五段 马五6亚段 马五7亚段 小层精细划分 鄂尔多斯盆地 

分 类 号：TE132.1[石油与天然气工程—油气勘探]