伊通地堑鹿乡断陷储层成岩作用特征  

DIAGENESIS CHARACTERISTICS OF LUXIANG RIFT IN YITONG GRABEN

作　　者：汪新光[1] 张建光[1] 魏忠元[1] 赵志魁[2] 江涛[2] 

机构地区：[1]中国地质大学研究生院,湖北武汉430074 [2]中国石油吉林油田分公司,吉林松原130087

出　　处：《大庆石油地质与开发》2009年第2期29-32,共4页Petroleum Geology & Oilfield Development in Daqing

基　　金：中国石油天然气股份有限公司吉林油田公司重点项目（2006026157）资助.

摘　　要：依据大量的薄片、扫描电镜、阴极发光和粘土矿物X衍射等资料，研究了鹿乡断陷储集层特征及成岩作用类型。结果表明，鹿乡断陷主要经历了压实、胶结、交代和溶解4个成岩阶段。压实和胶结作用是降低孔渗性能的主要因素，长石和方解石等成岩矿物的溶解作用与次生孔隙发育密切相关。依据储层中自生粘土矿物蒙皂石向伊利石转化的过程可划分为蒙皂石带、蒙皂石渐变带、第一迅速转化带，第二迅速转化带和第三迅速转化带。按照成岩阶段划分标准，将成岩阶段分为早成岩A期和B期，晚成岩A1期、晚成岩A2期和晚成岩B期。从早成岩B期到晚成岩A期是有机质成熟过程，粘土矿物转化、烃类热化学反应造成的酸性地层水介质使碎屑岩储层发育大量次生孔隙，是油气勘探的重点层段。Based on abundant data of thin slice, scanning electron microscope, cathodeluminescence, clay mineral and diffraction, this paper studies reservoir characteristics and diagenesis type of Luxiang Rift. The result shows that Luxiang Rift mainly experienced 4 digenetic stages： compaction, cementation, metasomatism and dissolution. Compaction and cementation are key factors that reduce porosity and permeability. Dissolution of feldspar and calcite and other digenetic minerals are closely related to development of secondary porosity. According to transform of self-generated clay mineral （smectite） to illite in the reservoirs, conversion process is classified into smectite zone, smectite gradation zone, first fast conversion zone, second fast conversion zone and third fast conversion zone. Digenetic stage can be divided into stage A and stage B in early diagenesis, stage A1, A2 and stage B in late diagenesis in accordance with subdivision criterions. Transform of stage B in early diagenesis to stage A in late diagenesis is maturing period of organic matter. Conversion of clay mineral and hydrocarbons thermochemical reaction lead to forming of acidic formation water medium, which produces a number of secondary pores in elastic reservoir being the major intervals for hydrocarbon exploration.

关 键 词：鹿乡断陷 低渗透储层 成岩作用 

分 类 号：TE121[石油与天然气工程—油气勘探]