成都理工大学学报（自然科学版）2017，Vol.44Issue(6)：708-716,9.DOI:10.3969/j.issn.1671-9727.2017.06.08
西湖凹陷花港组低孔低渗砂岩储层中绿泥石环边的成因及其意义
Genesis of chlorite rims and its significance to low porosity and low permeability sandstone reservoir of Huagang Formation in north central Xihu sag, East Sea of China
摘要
Abstract
Sandstone reservoir of Oligocene Huagang Formation in north central Xihu sag is characterized by low porosity and low permeability with good physical property and its high-quality reservoir with high tested productivities attributes to the development of chlorite rims in the sandstones.Based on the study of casting thin sections,SEM,X-ray diffraction and quartz fluid inclusion,the genesis of chlorite rims is determined and its significance to the reservoir is discussed.It reveals that the innermost layer of chlorite rims is formed by clay particles unable to precipitate surrounding clastic grains,influenced by ferric ions in later digenesis,and the outer layer of the rims surrounded the inner layer and resulted from continuous supply of ferric ion from volcanic debris and volcanic tuff.Chlorite rims are formed before dissolution and quartz overgrowth,so the rims can not only relieve subsequent compaction and restrain cementation,but also protect primary pores and promote later dissolution.In addition,chlorite rims plays a role in the formation of favorable pore throat structure and in the improvement of oil and gas saturation.Therefore,the occurrence of chlorite rims is an important factor for the development of high quality reservoirs.The study of chlorite rims in sandstones can promote the exploration of oil and gas.关键词
西湖凹陷/花港组/低孔低渗储层/绿泥石环边/优质储层Key words
Xihu sag/Huagang Formation/low porosity and low permeability reservoir/chlorite rims/high-quality reservoir分类
能源科技引用本文复制引用
钟韬,曹冰,刘金水,高红艳,刘创新..西湖凹陷花港组低孔低渗砂岩储层中绿泥石环边的成因及其意义[J].成都理工大学学报（自然科学版）,2017,44(6):708-716,9.基金项目
“十三五”国家科技重大专项(2016ZX05027-003). （2016ZX05027-003）
