黄伟林;冯明友;刘小洪;陈波;郑江;刘田;

• 1:西南石油大学地球科学与技术学院
• 2:中石油西南油气田分公司重庆气矿地质研究所

摘要(Abstract)：

渝东石柱地区志留系龙马溪组页岩地层发育特殊的纤维状方解石脉体。为揭示其流体来源及形成机理,结合岩石学及地球化学特征等开展系统分析。研究表明,纤维状方解石脉(FCV)以顺层或近平行层面充填于黑色粉砂质页岩和泥质粉砂岩微裂缝中,脉体宽0.1～4.0 cm、横向延伸一般为0.5～8.0 m。纤维状方解石晶体以柱状、纤维状垂直裂缝壁生长为主,多与石英共生产出。晶体表面洁净,局部见方解石压力影、机械双晶及晶体间锯齿状晶界。阴极发光下纤维状方解石呈暗红色-橘红色;碳-氧同位素分析表明δ~(13)C_(PDB)略偏负、δ~(18)O_(PDB)负异常明显(δ~(13)C_(PDB)、δ~(18)O_(PDB)平均值分别为-1.549‰及-12.654‰),指示其形成过程中受温度升高影响明显;流体包裹体均一温度平均值为159.5℃。结合区域构造-热演化史分析,结果表明石柱地区龙马溪组FCV形成流体具造山带同构造期超高压有机流体性质特征,为中-晚三叠世印支期同构造作用驱动深部流体叠加生烃超高压释放导致水力压裂所致,裂缝的开启导致孔隙流体的过饱和及纤维状方解石的快速沉淀。

关键词(KeyWords)： 渝东地区;志留系;龙马溪组;纤维状方解石脉;页岩;同构造期超高压

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金重大项目(41390451-2);; 四川省教育厅项目(16ZB0089);; 天然气地质四川省重点实验室项目(2015trqdz01)

作者(Author): 黄伟林;冯明友;刘小洪;陈波;郑江;刘田;

Email:

DOI: 10.19509/j.cnki.dzkq.2020.0317

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