测井岩性识别方法及应用——以鄂尔多斯盆地中西部长7油层组为例

摘要/Abstract

摘要： 基于鄂尔多斯盆地中西部延长组长7油层组不同岩性、电性、物性、放射性在测井响应上的差异，建立了两种测井—岩性识别方法：交会图法和测井曲线计算法。交会图法通过测井曲线与岩性交会识别出砂岩类、粉砂岩类、泥页岩类和凝灰岩类，测井曲线计算法通过计算泥质含量和有机碳含量将岩性划分为砂岩类、粉砂岩类、泥岩类和富有机质页岩。将计算结果与实验测试结果和岩心进行比对，准确率均达到86%以上。将研究区240口井的岩性识别结果运用于剖面图和平面图的构建发现，研究区长7油层组底部页岩大面积连续发育，向上逐渐减少；砂体主要发育在研究区北部、东部和东北部，其次为西南部和南部。随时间推移研究区中部孤立沉积的砂体个数和面积逐渐增加，并在长71形成大面积发育的砂体。

关键词: 鄂尔多斯盆地, 延长组, 长7油层组, 测井岩性识别

Abstract: Based on the different logging responses in lithologic, electric, physical and radioactive properties of the seventh member of the Yanchang Formation (Chang 7 Member) in the central-western Ordos Basin, two innovative logging-lithology identification methods have been developed, i.e. cross-plot method and Vsh–TOC method. The former method can be used to identify sandstones, siltstones, mudstones and tuffs by crossing the well logs with lithology, while the latter method can be used to identify sandstones, siltstones, mudstones and high-organic shale through calculating the shale content (Vsh) and organic carbon content (TOC). By comparing the calculation results with test results and core samples, both methods are determined to have accuracy above 86%. Results of lithology identification for 240 wells within the study area were used to generate planar and cross sections. It is indicated that shales are widely and continuously developed at the top of the Chang 7 Member in the study area and reduce upwards; sandstones are distributed in the northern, eastern and northeastern parts of the study area, as well as the southern and southwestern parts. As time goes by, the isolate sand bodies in the central part of the study area increased both in area and quantity, and eventually formed the large distribution in Chang 7₁.

Key words: Ordos Basin, Yanchang Formation, Chang 7 Member, logging-lithology identification

成大伟, 袁选俊, 周川闽, 谭聪, 汪梦诗. 测井岩性识别方法及应用——以鄂尔多斯盆地中西部长7油层组为例[J]. 中国石油勘探, 2016, 21(5): 117-126.

Cheng Dawei, Yuan Xuanjun, Zhou Chuanmin, Tan Cong, Wang Mengshi. Logging-lithology identification methods and their application: A case study on Chang 7 Member in central-western Ordos Basin, NW China[J]. China Petroleum Exploration, 2016, 21(5): 117-126.

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