桩海地区下古生界潜山内新一类储层:硅化岩储层的发现及特征  

A New Type of Reservoir of Paleozoic Buried Hill in Zhuanghai Area:Discovery and Characteristics of Silicified Rock

作　　者：于正军[1,2,3] 许淑梅[4,5] 王金铎[2] 于建国[2] 韩文功[4] 李三忠[4,5] 马云[4] 

机构地区：[1]中国科学院海洋研究所,中国科学院海洋地质与环境重点实验室,山东青岛266071 [2]中国石化股份胜利油田分公司物探研究院,山东东营257022 [3]中国科学院研究生院,北京100083 [4]中国海洋大学地球科学学院,山东青岛266100 [5]海底科学与探测技术教育部重点实验室,山东青岛266100

出　　处：《地球科学（中国地质大学学报）》2010年第1期87-96,共10页Earth Science-Journal of China University of Geosciences

摘　　要：通过对研究区下古生界取心井的岩心描述、镜下(包括偏光显微镜和扫描电镜)观察,并对目的层段声波时差、密度、自然伽马等测井参数进行分析,发现研究区下古生界硅岩段与原生硅岩的岩-电特征明显不同,本文称之为"硅化岩",并总结了硅化岩段的特征.研究区下古生界硅化岩之原岩残留结构清晰、硅岩晶粒自形程度高;硅化岩段常出现热水矿物萤石、重晶石、黄铁矿、铁方解石、石英等的共生组合,且次生热水矿物的再次溶蚀特征显著;硅岩段孔隙极为发育,不但有角砾间溶洞、溶缝,次生矿物溶蚀也形成溶洞、裂缝等有效储集空间,另外,自形石英晶簇的晶间微孔隙也十分发育;与碳酸盐岩相比硅化岩段具有极低速度、较低密度特点,且其分布具有"穿层性".通过与下古生界原生硅岩特征进行对比,认为桩海地区下古生界硅化岩为次生成因,其形成是埋藏溶蚀作用的结果.次生硅化岩为下古生界潜山中一种新的储层类型.这种新储层类型的发现不但对中国东部陆相盆地高成熟探区的油气挖潜具有重要的实际意义,而且对于进一步丰富硅岩理论、推动硅岩研究进展也具有一定的学术价值.Based on the core description, microanalysis and processing of the logging data including AC, GR and DEN, a new type of silicalite reservoirs in Paleozoic buried hill in Zhuanghai area is found whose rock-electric properties are very different from those of protogenesis siliealites. Siliealite reservoirs are called silicified rock here and their characteristics are generalized, The structure of pri mary rock of silicified rock is clear and the idiomorphic degree of quartz crystal is high. Paragentic hydro thermal mineral assemblage of fluorite, barite, pyrite, ferrocalcite and quartz with secondary characteristic are common in silici fled rock layer and the secondary corrosion of these paragentic hydrothermal minerals is significant. The pore of silicified layer is wery developed including not only large solution cavities among breecias and secondary pores by dissolution of the Paragentic hydrothermal minerals, but also the micro-pores among the idiomorphic quartz crystal druse. The P-wave velocity and the density of silicified rock are much lower than that of the carbonate and the distribution of silicified rock in buried hill is featured with the ＂cross-layer＂ characteristic. By comparing with the characteristic of the protogenesis silicalite in Paleozoic buried hill, it is believed that the silicified rock is secondary genesis which resulted from deep buried modification. The secondary silicified rock is a new type of reservoir of Paleozoic buried hill in Zhuanghai area. The discovery of this new kind of reservoirs is not only of value to the high exploration basin, but also of scientific significance to the advance of silicate research.

关 键 词：(次生)硅化岩 储层 下古生界 岩石学 桩海地区 

分 类 号：P618.13[天文地球—矿床学] X14[天文地球—地质学]