塔中北坡中-下奥陶统碳酸盐岩缝洞方解石充填物地球化学特征差异及其对储层的指示意义Geochemical Characteristics Differences and Implication of the Reservoir of the Calcite Filling in the Middle-Lower Ordovician,Northern Slope of Tazhong Area
李映涛;张哨楠;韩俊;曹自成;黄诚;叶宁;
摘要(Abstract):
方解石胶结充填孔洞及裂缝是破坏塔中北坡中-下奥陶统碳酸盐岩储层储集空间最主要的成岩作用,工区单井取心段发育的孔洞和裂缝中存在大量的方解石充填物。通过对中石化塔中北坡矿权区8口单井的孔洞及裂缝方解石充填物取样,基于镜下薄片、阴极发光、碳氧同位素、包裹体以及稀土元素等特征的综合分析表明,一间房组孔洞方解石充填物在保留原始海源流体信息的同时遭受了大气淡水的影响,指示一间房组存在较为典型的(准)同生期大气水溶蚀作用,形成了早期溶蚀孔洞,储集空间为早期充填残余孔;鹰山组裂缝方解石充填物基本不具有同期海相方解石的特征,地球化学特征显示其属于热液成因,反映鹰山组储集空间分布受构造热流体控制,且在彼此相邻、性质相似的2条走滑断裂带内部,构造热流体具有同源性。
关键词(KeyWords): 孔洞充填物;地球化学;稀土元素;碳氧同位素;顺南地区
基金项目(Foundation): 中石化西北油田分公司项目“塔里木寒武系-中下奥陶统储层发育模式研究”(P16112)
作者(Author): 李映涛;张哨楠;韩俊;曹自成;黄诚;叶宁;
Email:
DOI: 10.19509/j.cnki.dzkq.2018.0105
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