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

YU Zheng-jun; XU Shu-mei; WANG Jin-duo; YU Jian-guo; HAN Wen-gong; LI San-zhong; MA Yun

doi:10.3799/dqkx.2010.009

Abstract：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 silicalites. Siliealite reservoirs are called silicified rock here and their characteristics are generalized. The structure of primary 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 very developed including not only large solution cavities among breccias 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 den-sity of silicified rock are much lower than that of the carbonate and the distribution of silicified rock in buffed 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 on-ly of value to the high exploration basin, but also of scientific significance to the advance of silicate research.