元素录井在陇东区块长7段致密油储层水平井地质导向中的研究与应用

doi:10.3969/j.issn.1672-9803.2024.01.007

摘要/Abstract

摘要： 陇东区块延长组长7段岩层由于受湖相沉积因素影响,导致致密油储层具有非均质性较强、砂体横向延展性较差的特征。传统地质导向使用的钻时、气测、岩性、随钻伽马等参数,在该区水平井地质导向过程中很难实现层位对比和追踪,致使储层钻遇率较低,成为多年来制约陇东区块致密油水平井规模拓展的一个技术瓶颈。通过优选特征元素,使用元素比值法及交会法,建立适用于陇东区块的致密油储层元素录井特征参数模板;同时提出元素“局部重复性对比法”,解决无邻井元素剖面可供对比及砂体横向非均质性较强情况下的水平井层位对比与追踪难题,从而提高了致密油水平井储层钻遇率,证实了元素录井在指导非均质性较强的致密油水平井地质导向过程中具有独到的优势及潜力。

关键词: 元素录井, 致密油储层, 水平井, 地质导向, 元素比值法, 局部重复性对比法

Abstract: Due to the influence of lacustrine sedimentary factors in the Chang 7 Member of Yanchang Formation in the Longdong block, the tight oil reservoirs have the characteristics of strong heterogeneity and poor lateral ductility of sand bodies. Drilling time, gas logging, lithology, gamma while drilling and other parameters used in traditional geosteering are difficult to achieve horizon correlation and tracking in the geosteering process of horizontal wells in this block. As a result, the drilling rate of horizontal well reservoirs is low, and this problem has become a technical bottleneck restricting the scale expansion of tight oil horizontal wells in the Longdong block many years. The tight oil reservoir element logging characteristic parameter template suitable for the Longdong block is established now by optimizing the characteristic elements, using the element ratio method and intersecting and partitioning after reasonable combination. Meanwhile, the "local repeating correlation method" for elements is proposed to solve the problem of horizon correlation and tracking in horizontal wells when there is no adjacent well element profile for comparison and the sand body has strong lateral heterogeneity in order to improve the drilling rate of tight oil horizontal well reservoirs. This study proves that element logging has unique advantages and potential in guiding the geosteering process of tight oil horizontal wells with strong heterogeneity.

Key words: element logging, tight oil reservoir, horizontal well, geosteering, element ratio method, local repeating correlation method

中图分类号:

TE132.1

刘有武. 元素录井在陇东区块长7段致密油储层水平井地质导向中的研究与应用[J]. 录井工程, 2024, 35(1): 40-46.

LIU Youwu. Research and application of element logging in geosteering of horizontal wells in Chang 7 Member tight oil reservoirs in Longdong Block[J]. Mud Logging Engineering, 2024, 35(1): 40-46.

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