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高青地区上石盒子组致密石英砂岩成岩特征及其演化
赵永福1,2,杨少春1,任瑞1,王亚1
(1.中国石油大学(华东)地球科学与技术学院,山东青岛 266580;2.中国石化胜利油田分公司油气勘探管理中心,山东东营 257000)
摘要:
济阳坳陷东营凹陷高青地区二叠系上石盒子组发育致密石英砂岩。在普通薄片、铸体薄片、阴极发光、扫描电镜、流体包裹体等观察测试基础上,利用埋藏史和油气充注史,对高青地区上石盒子组致密石英砂岩成岩特征、成岩序列和成岩演化进行研究。结果表明:上石盒子组致密石英砂岩经历复杂的成岩改造,压实、胶结、溶蚀是主要的成岩作用类型;强烈的压实作用,多期的石英次生加大胶结作用和多种、多期高岭石、伊利石、方解石等其他不同类型胶结作用是导致石英砂岩致密化的主要因素;经历沉积埋藏→隆起抬升→再次埋藏的构造埋藏演化过程,上石盒子组石英砂岩的成岩演化序列为早期压实作用→长石溶蚀作用,石英加大、高岭石等胶结作用→方解石胶结作用,石英溶蚀作用,伊蒙混层胶结作用→碳酸盐(方解石)溶蚀作用,石英加大胶结作用,微裂缝作用;目前处于中成岩B期;研究区东营组沉积晚期以来发生了两期油气充注事件,导致有机酸成岩环境发生了一系列的成岩变化。
关键词:  高青地区  上石盒子组  致密石英砂岩  成岩作用  成岩演化
DOI:10.3969/j.issn.1673-5005.2019.06.003
分类号::TE 122
文献标识码:A
基金项目:国家科技重大专项课题(2017ZX05009001);山东省研究生教育质量提升计划项目(SDYY18029)
Diagenetic characteristics and evolution of tight quartz sandstones of Shangshihezi Formation in Gaoqing area
ZHAO Yongfu1,2, YANG Shaochun1, REN Rui1, WANG Ya1
(1.School of Geosciences in China University of Petroleum(East China), Qingdao 266580, China;2.Management Center of Oil and Gas Exploration, Shengli Oilfield, SINOPEC, Dongying 257000, China)
Abstract:
Gaoqing area is located in Dongying sag of Jiyang Depression. The tight quartz sandstone of Permian Shanghihezi Formation in Gaoqing area is mainly quartz sandstone. On the basis of thin sections, casting thin sections, cathodoluminescence, scanning electron microscopy(SEM), and fluid inclusion observation, burial history and hydrocarbon accumulation history are used to study the diagenesis and diagenetic evolution of diagenetic sequences. The results showed that tight quartz sandstone in the Gaoqing area has experienced a complex set of diagenesis, and compaction, cementation and dissolution are the main diagenesis types, including strong compaction, multi-phase quartz overgrowth cementation, a variety of multiphase kaolinite cementation, illite cementation and calcite cementation which are main factors lead to quartz sandstone tightness. The burial history includes an early deep burial stage, a middle uplift stage, and a late deep burial stage. The quartz sandstone in the B sub-stage of mesogenetic diagenesis has experienced the following evolution sequence:early stage compaction→feldspar dissolution; quartz overgrowth cementation; kaolinite cementation→calcite cementation; quartz dissolution; the slip layer cementation→carbonate-cement dissolution; calcite cement dissolution; quartz overgrowth cementation and microfracture. There have been two hydrocarbon filling events happened in this area from the stage of Dongying Formation, leding to a series of diagenetic changes in the organic acid diagenetic environment.
Key words:  Gaoqing area  Shangshihezi Formation  tight quartz sandstone  diagenesis  diagenetic evolution
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