靖边气田马五段小层划分方法

鄂尔多斯地区靖边气田奥陶系下统马家沟组划分为6段,其中马五段是该气田下古生界的主要产气层。为了完成单井钻探目的和准确卡取目的层,需要认识马五段地层物性特征。在现场录井过程中,通过综合利用岩屑、钻时和气测等方法可以准确划分马五段小层。笔者通过现场GX-1井的应用实例阐述了如何综合利用岩屑、钻时和气测等方法卡取目的层。现场实践表明,该方法对于准确卡取目的层和划分马五段小层的应用效果显著,对靖边气田其他井的录井工作具有借鉴意义。

Classification method for sub-members of the 5th Member,Majiagou Formation in Jingbian Gas Field

Six members were classified for Majiagou Formation in the lower Ordovician series,Jingbian Gas Field of Ordos region,the 5th Member is the main gas-producing horizons of lower Paleozoic,Jingbian Gas Field.In order to accomplish the purpose of drilling a single well and accurately determine target strata,the physical characteristics of the 5th Member need to be recognized.During on-site mud logging,the submembers of the 5th Member can be correctly classified with the methods of cuttings,drilling time and gas logging.How to utilize the methods of cuttings,drilling time and gas logging to determine the target beds was set forth with on-site application sample,well GX-1.The method yields notable results in correctly determining target beds and classifying the sub-members of the 5th Member,Majiagou Formation,and can be used for reference for mud logging of other wells in Jingbian Gas Field.