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Discovery and prediction of high natural gamma sandstones in Chang 73 Submember of Triassic Yanchang Formation in Ordos Basin, China

鄂尔多斯盆地三叠系延长组长73 砂层组高自然伽马砂岩的发现及其预测

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Abstract

The large scale development of high natural gamma sandstones has been discovered in the Chang 73 Submember of the Triassic Yanchang Formation in the Ordos Basin, China. High natural gamma sandstones consist of terrigenous detrital rocks with particle sizes ranging from silt to sand. They represent turbidite deposits characterized by high gamma ray values that are more than 180 American Petroleum Institute (API) units on a natural gamma ray log profile. For a long time, very high natural gamma sandstones had been identified as high-quality source rocks, such as oil shales, from conventional well log profiles, such as natural gamma ray well logs. Therefore, predicting the distribution of high natural gamma sandstones was studied. The sedimentary, lithological, and well log characteristics, as well as the genesis of the high radioactivity of high natural gamma sandstones were analyzed in the Chang 73 Submember. Thorium (Th), uranium (U) and other radioactive elements were found, carried by deep hydrothermal activity, and probably resulted in the formation of a relatively high radioactive zone in the cross-section, where high natural gamma sandstones usually develop in large quantities. This caused many turbidite sand bodies, which should have a continuous distribution in the cross-section, to appear to have a discontinuous distribution, when using conventional well log profiles, such as natural gamma ray well logs. From the above mentioned apparent discontinuous distribution of turbidite sand bodies in the cross-section, a continuous distribution can be predicted. It is obvious that the prediction of areas of continuous turbidite sand bodies in the cross-section usually corresponds with areas where high natural gamma sandstones are developed in large quantities. Exploration and development practice demonstrated that the developed method is fast and effective in predicting high natural gamma sandstones in the Chang 73 Submember.

摘要

鄂尔多斯盆地上三叠统延长组长73 砂层组大规模发育自然伽马测井值大于180 API、浊流沉积 的粉砂级-细砂级高自然伽马砂岩, 由于长期以来自然伽马等常规测井系列将其识别为“油页岩等优质 烃源岩”, 为此开展了其分布预测研究。通过盆地长73 砂层组沉积特征、岩性特征、测井特征以及高 自然伽马砂岩高放射性成因的分析, 认为深部热水活动携带的Th、U 等放射性元素可能形成了长73 砂层组平面上放射性相对高值区且相对高值区内高自然伽马砂岩常大量发育, 导致长73 砂层组本应在 平面上具有连续形态的浊流沉积砂体, 而在根据自然伽马等常规测井系列识别上呈现出“平面上不连 续的形态”, 但可根据“平面上不连续的浊流沉积砂体形态”预测出浊流沉积砂体平面上可能具有的连 续形态, 显然平面上预测出的连续砂体形态部位为高自然伽马砂岩大量发育区。勘探开发实践表明, 上述方法对长73 砂层组高自然伽马砂岩的预测快速有效。

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Authors and Affiliations

  1. School of Chemistry & Chemical Engineering, Yulin University, Yulin, 719000, China

    Qing-hua Zheng  (郑庆华), Ji-yuan You  (尤继元), Yun-yun Bai  (白云云), Jing-hui Wang  (王镜惠) & Xiao-liang Chen  (陈小亮)

  2. Changqing Division, China Petroleum Well Logging Limited Company, Xi’an, 710201, China

    Xing-jun Liu  (刘行军)

  3. Department of Geology, Northwest University, Xi’an, 710069, China

    Ji-yuan You  (尤继元)

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Project(18GK28) supported by the Doctoral Scientific Research Starting Foundation for the Yulin University, China; Project(20106101110020) supported by the University Research Fund of Science and Technology Development Center of Ministry of Education, China; Project(BJ08133-3) supported by the Key Fund Project of Continental Dynamics National Key Laboratory of Northwest University, China

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Zheng, Qh., Liu, Xj., You, Jy. et al. Discovery and prediction of high natural gamma sandstones in Chang 73 Submember of Triassic Yanchang Formation in Ordos Basin, China. J. Cent. South Univ. 26, 1840–1855 (2019). https://doi.org/10.1007/s11771-019-4138-z

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