塔北隆起哈拉哈塘凹陷东河砂岩成岩作用及其控制因素

摘要

通过岩心及薄片的观察，结合扫描电镜阴极发光等资料分析，对哈拉哈塘地区东河砂岩成岩作用进行了研究。结果表明：东河砂岩以岩屑石英砂岩为主，成岩作用类型有压实作用、胶结作用、溶解作用及交代作用。综合成岩作用的组合类型及其演化序列，认为本区东河砂岩主体处于中成岩阶段A期。分别讨论了沉积相、埋藏作用和层序地层等对成岩作用的控制，研究区东河砂岩在低温背景下，长期浅埋且晚期短暂快速深埋，总体上压实程度中等；主要发育滨岸和浪控三角洲沉积体系，在高精度层序界面附近，相对海平面上升，可容纳空间增大，沉积物沉积速率相对较低，且停留时间长，在同生成岩和早成岩阶段容易形成广泛分布的碳酸盐胶结。%Donghe sandstone diagenesis were studied through core and rock slice observations and data analysi-ses of scanning electron microscope and cathodoluminescence in the Hanilcatam depression.The reservoir rocks mainly is lithic quartz sandstone.The types of the diagenesis are the compaction,cementation,replacement and dissolution.The diagenetic stage belongs to the A middle diagenesis.The control of sedimentary facies,burial and sequence stratigraphy on diagenesis are discussed.Donghe sandstone in the study area was long-term shal-low buried and short-term quick deep buried in later period in the low-temperature background,so the degree of compaction is moderate in general.Shore and wave-dominated deltaic depositional systems are developed.Near the high-resolution sequence boundaries where relative sea-level rises,accommodate space increases,sediment deposition rate is relatively low,and residence time is long,develop laterally persistent carbonate cemented ho-rizons in syndiagenesis and early diagenesis stages.