元素录井技术在鄂尔多斯盆地致密砂岩水平井地质导向中的研究与应用

doi:10.3969/j.issn.1672-9803.2020.04.004

摘要/Abstract

摘要： 鄂尔多斯盆地上古生界致密砂岩发育于不同类型的河流-三角洲沉积体系,由于河流-三角洲相砂体迁移摆动及纵向多期叠置,导致地层垂向序列复杂,加之局部地区微幅构造发育,水平井往往钻遇泥岩,给常规水平井地质导向增加了很大的难度。为达到快速钻进、提高砂体钻遇率的目的,运用元素录井参数、元素比值对目的层及顶、底板泥岩进行精细刻画,建立小层元素响应特征标准模型,并在水平段施工过程中根据实钻元素参数与标准模型进行分析对比,可以快速判断钻头的相对位置,进而及时进行轨迹调整。该方法在研究区S 59井进行现场应用,钻遇率达到了90.26%。在鄂尔多斯盆地东部上古生界致密砂岩水平井导向中的应用结果表明,元素录井技术能够有效地弥补现有地质导向方法存在的欠缺,满足井场生产需求。

关键词: 元素录井技术, 致密砂岩, 水平井地质导向, 钻遇率

Abstract: Tight sandstones of the Upper Paleozoic in Ordos Basin are developed in different types of fluvial-delta sedimentary systems. Due to the migration of fluvial-delta facies sand body and vertical multi-stage superimposition,the vertical sequence of strata is complicated. Micro-structures are developed in some areas,and horizontal wells often drill mudstones,which adds great difficulty to conventional horizontal well geosteering. To realize rapid drilling and increase the drilling rate of sand body,element logging parameters and element ratio are used to finely describe the target layer and the top and bottom mudstones. A standard model for element responding characteristics of single layers is established,and comparison with standard model on the basis of element parameters in actual drilling is made during the construction of horizontal segment,which can quickly determine the relative position of drill bits,and adjust the trajectory in time. This method was applied in the field of well S 59 in the study area,and the drilling rate reached 90.26%. The application in the horizontal well geosteering in the tight sandstone of the Upper Paleozoic in Eastern Ordos Basin showed that element logging can effectively make up for the shortcomings of existing geosteering methods and meet the production needs on well site.

Key words: element logging technology, tight sandstone, horizontal well geosteering, drilling rate

中图分类号:

TE132.1

阎荣辉, 田伟志, 鲍永海, 武星, 杨森, 沈柏坪. 元素录井技术在鄂尔多斯盆地致密砂岩水平井地质导向中的研究与应用[J]. 录井工程, 2020, 31(4): 22-28.

YAN Ronghui, TIAN Weizhi, BAO Yonghai, WU Xing, YANG Sen, SHEN Boping. Research and application of element logging in horizontal well geosteering of tight sandstone in Ordos Basin[J]. Mud Logging Engineering, 2020, 31(4): 22-28.

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