唐海忠,魏军,周在华,肖文华,俞海东,魏浩元
Tang Hai-zhong,Wei Jun,Zhou Zai-hua,Xiao Wen-hua,Yu Hai-Dong,Wei Hao-yuan
摘要: 酒泉盆地营尔凹陷深层下沟组砂岩异常高孔带中方解石是体积最大的胶结物。通过铸体薄片、扫描电镜、电子探针等技术观察和测试方解石胶结物的赋存状态与化学组成,研究了其成因机制及与异常高孔带的关系。结果表明:方解石胶结物以浸染状、团块状和斑点状赋存于砂岩中;浸染状方解石的胶结作用使砂岩致密,其形成于早成岩阶段A期,物质来源于泥岩压释水;团块状和斑点状方解石胶结物是浸染状方解石胶结物经5期多源化和多样化的溶蚀流体改造形成,伴随着铁方解石向无铁方解石转化,致密砂岩向异常高孔带砂岩转化;5期方解石胶结物溶解作用的叠加区是油气勘探开发的首选目标区。针对陆相深层富含方解石胶结物的砂岩异常高孔带,强调和推广岩石学证据作为研究方解石胶结物成因机制和厘定异常高孔带类型的第一手资料,其他资料的应用解释都应服从于岩石学证据。
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