Chlorite cement and its effect on the reservoir quality of sandstones from the Panyu low-uplift,Pearl River Mouth Basin

作     者：Chen Guojun~1,Du Guichao~(1,3*),Zhang Gongcheng~2,Wang Qi~1,Lv Chengfu~1 and Chen Ji~(1,3) ~1Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences, Lanzhou 730000,China ~2CNOOC Research Center,Beijing 100027,China ~3Graduate University of the Chinese Academy of Sciences,Beijing 100049,China 

会议名称：《中国科学院地质与地球物理研究所第11届（2011年度）学术年会》

会议日期：2012年

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：supported by the China National Science & Technology Project(2008ZX05025-006) the China 973 Key Foundation Research Development Project(2009CB219400) 

关 键 词：Chlorite cement diagenesis reservoir quality Panyu low-uplift Pearl River Mouth Basin 

摘      要：Based on porosity and permeability measurements,mercury porosimetry measurements, thin section analyses,SEM observations,X-ray diffraction(XRD) analysis and granulometric analyses, diagenetic features of reservoir sandstones taken from the Zhuhai formation in the Panyu low-uplift of the Pear River Mouth Basin were *** study shows that chlorite cements are one of the most important diagenetic features of reservoir *** precipitation of chlorite was controlled by multiple factors and its development occurred early in eo-diagenesis and continued till Stage A of middle *** precipitation of chlorite at the early stage was mainly affected by the sedimentary environment and *** Fe- and Mg-rich materials were supplied during the deposition of distributary channel sediments in the deltaic front setting and mainly in alkaline *** the burial depth increasing,smectite and kaolinite tended to be transformed into *** cements were completely transformed into chlorite in sandstones of the studied *** lithics rich in Fe and Mg materials were dissolved and released Fe and Mg into the pore *** cations precipitated as chlorite cements in middle diagenesis in an alkaline diagenetic *** coatings acted as porosity and permeability,thus helping preserve cements in the chlorite cemented *** reservoir quality of chlorite cemented sandstones is much better than sandstones without chlorite cements. Chlorite cements play an important role in the reservoir evolution that was mainly characterized by preserving intergranular porosity and forming better pore-throat structures of sandstones.