济阳坳陷弱磁性碳酸盐岩岩心裂缝古地磁定向研究  

Study on paleomagnetic fracture orientation of weakly magnetic carbonate cores in Jiyang depression

作　　者：孙志勇[1,2] 陈开远[1] 杜玉山[2] 王玉芹[2] 隋淑玲[2] 

机构地区：[1]中国地质大学(北京)能源学院北京100083 [2]中国石化胜利油田分公司勘探开发研究院山东东营257015

出　　处：《地质科学》2017年第3期954-963,共10页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家油气重大专项“复杂裂缝性碳酸盐岩油藏开发关键技术”（编号：2011ZX05014-004）资助.

摘　　要：摘要裂缝走向是影响裂缝性油藏有效开发的关键参数之一，但在非定向岩心上，裂缝走向无法确定。古地磁分析是一项有效的岩心定向技术，该方法在火山岩及一些剩磁强度较大的泥质岩石中取得了较好的应用效果，但它很少应用于弱磁性的碳酸盐岩岩心定向。论文对济阳坳陷富台潜山的弱磁性碳酸盐岩岩心样品开展了系统的等温剩磁和热退磁测试，成功分离出粘滞剩磁并确定了该区的裂缝发育方向：优势发育北东东和北北西两组方向，3组次要方向为北西西向、北西向和北北东向；测试结果与FMI资料及构造应力场分析结果一致。本研究拓展了古地磁定向技术在弱磁性岩心中的应用。Orientation of fracture is a key parameter affecting effective development of fractured reservoir, but it is hard to ascertain the fracture trend of non-oriented cores. The paleomagnetic method is an effective core orientation technique developed in recent years, and its application in volcanic rocks and some of the argillaceous rocks with larger remnant magnetization intensity has achieved good performance. However, its use in the carbonate rocks with weak magnetization is rarely studied. Based on a systematic test of isothermal remnant magnetization and thermal demagnetization of the weak magnetic carbonate core samples from Jiyang depression, this paper successfully obtains the viscous magnetic remnants and identifies the rough development orientation of the fracture in this region： Two major groups NEE and NNW, and three minor groups NWW, NW and NNE. The fracture orientation from this core test is consistent with FMI data and tectonic stress field analysis results. The research results expand the application of the palaeomagnetic orientation in the weakly magnetic cores.

关 键 词：济阳坳陷 弱磁性碳酸盐岩 古地磁定向 粘滞剩磁 裂缝方向 

分 类 号：P318.4[天文地球—固体地球物理学]