春风油田沙湾组砾岩层特征及测井定量识别

Characteristics and log quantitative identification of conglomerate layers,
Shawan Formation, Chunfeng Oilfield

侯庆杰¹ 金强¹ 李伟忠² 林腊梅¹ 田飞 4 李培培¹

中国石油大学（华东）地球科学与技术学院，山东 青岛 266580 中国石化胜利油田分公司地质科学研究院，山东 东营 257017 中国科学院油气资源研究重点实验室，北京100029 中国科学院地质与地球物理研究所，北京100029

School of Geosciences, China University of Petroleum, Qingdao 266580, China Geological Research Institute, Shengli Oilfield Company, SINOPEC, Dongying 257017, China Key Laboratory of Petroleum Resources Research, Chinese Academy of Sciences, Beijing 100029, China Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

春风油田沙湾组发育多套砾岩层，具有火山岩砾石成分多，钙质胶结程度高和放射性强的特点。基于对目的层的岩心和薄片观察、微量元素分析和测井资料解释，研究了春风油田沙湾组砾岩层特征和测井定量识别方法。结果表明，研究层段为多物源近岸水下扇沉积体系，其砾岩层为扎伊尔山石炭—二叠系物质被洪水搬运至湖盆所形成的产物。砾岩层段铀元素质量分数大于23.2 μg/g，在地下水流动过程中发生还原反应释放大量的碳酸根离子，为钙质胶结提供有利的条件。利用常规测井曲线，建立砾岩层识别图版和函数识别全区砾岩层，认为研究区存在3个物源入湖区，主体沿西北—东南方向展布，砾岩层呈多期次分布且逐渐向东南迁移，反映了湖退以及水下河道向东南方向逐步推进的过程。

Many sets of conglomerate layers were developed in Shawan Formation of Chunfeng Oilfield with more volcanic rock composition, high level calcium cementation and radioactivity. Based on observation of core samples, thin sections, analysis of trace element compositions and interpretation of logging data, the characteristics and log quantitative identification method of conglomerate layers, Shawan Formation, Chunfeng Oilfield, were investigated. The results show that the nearshore subaqueous fan which has more than one source was developed in the study area, and the conglomerate layers were formed from the materials which were handled to the lake by the flood from permo-carboniferous of Zaire Mountain. The content of uranium is more than 23.2 μg/g, reduction reaction happens with the groundwater flows and produces more carbonate ions, providing favorable conditions for calcium cementation. The identification chart and function of conglomerate layers are built to identify the conglomerate layers of the research area with the conventional logging data. It is believed that there are three sources that flow to the lake; from northwest to southeast, the conglomerate layers gradually migrated southeastwards, which reflects that the process of lake regression and underwater channels transferring to the southeast.

10.6056/dkyqt201702008