摘要
成岩作用是深层储层发育最为重要的控制因素。对沙垒田凸起及围区沙河街组储层成岩作用及致密化过程进行了分析,结果表明:研究区沙河街组储层主要的破坏性成岩作用是压实作用和碳酸盐胶结作用,其中压实作用起主导作用,在其作用下随着埋深的增加储层趋于致密化;碳酸盐胶结作用以中、晚期为主,且碳酸盐胶结物含量越高,储层物性越差。研究区沙河街组储层主要的建设性成岩作用是溶蚀作用和超压支撑作用,其中溶蚀作用对研究区储层物性的提升有相当明显的影响;超压消减了压实作用对储层的伤害,有利于深层储层孔隙的保留。薄片镜下观察和碳、氧同位素资料表明,研究区沙河街组溶蚀作用是有机质排放有机酸产生的,碳酸盐胶结作用是有机酸溶蚀以后的再沉淀,进一步证明了碳酸盐胶结作用发生时间较晚。
Diagenesis is the most important control factor for the development of deep reservoirs.Analysis of diagenesis and compaction has been conducted for the Shahejie Formation reservoirs in the Shaleitian uplift and surrounding area in Bohai sea,with the following conclusions obtained.As for destructive diagenesis for the Shahejie Formation reservoirs in the research area,it mainly refers to compaction and carbonate cementation,in which,compaction plays a dominant role and compacts reservoirs more with the depth increasing,and carbonate cementation is mainly in middle and later stages,and the physical properties worsen with the increase of carbonate cement.As for constructive diagensis,it mainly refers to dissolution and overpressure support,in which,dissolution has certain obvious effects on the improvement of physical properties of formations in the research area and overpressure counteracts the damage of compaction to reservoirs and is in favor of the keeping of deep reservoir pores.As suggested by thin slices under microscope and carbon and oxygen isotope data,dissolution occurring in the Shahejie Formation of the research area is due to organic acid from organic matters and carbonate cementation is a reprecipitation process following dissolution by organic acid,proving the later period of carbonate cementation.
作者
陈保柱
彭靖淞
吴俊刚
张新涛
魏国财
CHEN Baozhu;PENG Jingsong;WU Jungang;ZHANG Xintao;WEI Guocai(CNOOC China Limited,Tianj in Branch,Exploration Department,Tianjin 300459,Chin)
出处
《中国海上油气》
CAS
CSCD
北大核心
2018年第3期38-46,共9页
China Offshore Oil and Gas
基金
"十三五"国家科技重大专项"渤海海域勘探新领域及关键技术研究(编号:2016ZX05024-003)"部分研究成果
关键词
沙垒田凸起及围区
沙河街组
压实作用
碳酸盐胶结作用
溶蚀作用
超压支撑作用
Shaleitian uplift and surrounding area
Shahejie Formation
compaction
carbonate cementa tion
dissolution
overpressure support
