长岭断陷层碎屑岩成岩作用与次生孔隙  

DIAGENESIS AND SECONDARY POROSITY OF CLASTIC ROCKS IN CHANGLING FAULTED DEPRESSION

作　　者：李海华[1] 张彦霞[1] 王保华[1] 

机构地区：[1]中国石化勘探开发研究院无锡石油地质研究所,江苏无锡214151

出　　处：《大庆石油地质与开发》2010年第5期29-34,共6页Petroleum Geology & Oilfield Development in Daqing

基　　金：中国石油化工股份有限公司科技部项目（P03065）资助.

摘　　要：长岭断陷层碎屑岩储层为扇三角洲、水下浊积扇、河流相的长石岩屑砂岩、长石砂岩、岩屑长石砂岩.岩石主要经历了压实、胶结、溶蚀和交代等成岩作用,溶蚀作用主要为有机质热成熟演化形成的有机酸和黏土矿物转化脱出的水对易溶物质的溶蚀.成岩阶段可分为早成岩A期、B期,晚成岩A期、B期、C期.晚成岩A期是断陷层溶蚀作用发生的主要时期.孔隙类型主要包括原生孔隙和次生孔隙,次生孔隙主要由碳酸盐胶结物、长石及部分岩屑溶蚀形成.在腰英台地区现今埋深3 500 m（登娄库组）左右的深度范围内和东岭地区现今埋深2 100 m、2 400 m（登娄库组）左右次生孔隙最发育,其形成主要受成岩演化阶段控制.The clastic reservoirs in Changling fauhed depression are primarily feldspathic lithic sandstone, arkose and lithic arkose of fan-delta, underwater turbidite fan and fluvial facies, accordingly. These sandstones have experienced mechanical compaction, cementation, denudation and metasomatic replacement. The denudation refers to the impact of organic acid formed by thermal mature evolution of organic matter and water of dehydration transformed from clay mineral on the lyotrope. The diagenesis stage could be divided into early diagenesis A and B, late diagenesis A, B and C. The denudation of faulted depression mainly occurred in late diagenesis A. The porosity types include primary porosity and secondary porosity formed by carbonate cements, feldspars and partly debris dissolutions. The secondary porosities, with the buried depth of 3 500 m in Yaoyingtai area （ Denglouku Formation） and 2 100 m, 2 400 m in Dongling area （ Denglouku Formation } , are developed well, which is controlled by diagenesis evolution stage.

关 键 词：次生孔隙 孔隙演化 成岩作用 碎屑岩储层 长岭断陷层 

分 类 号：TE122.2[石油与天然气工程—油气勘探]