古地理学报2018，Vol.20Issue(2)：299-310,12.DOI:10.7605/gdlxb.2018.02.022
渤海湾盆地东濮地区奥陶系碳酸盐岩成岩作用及对储集层的影响
Diagenesis and its effect to carbonate reservoirs of the Ordovician in Dongpu area, Bohai Bay Basin
摘要
Abstract
In pace with the intensive exploration of the geothermal resource,the current research level of the ordovician reservoirs in Dongpu area can not meet the exploration demand.Therefore,through the analysis of outcrops,cores,thin sections,loggings,C-O isotopes,and fluid inclusions,this paper documents the diagenesis system and its impacts on the Ordovician carbonate reservoirs in Dongpu area.Furthermore,the current study also points out the areas where develop favourable reservoirs.The results show that cementation,compaction,penecontemporaneous dolomitisation,and penecontemporaneous dissolution occurred in syngenetic diagenesis stage.The cementation and compaction had reduced the primary porosity of the reservoir significantly.Weathering karst developed in the epidiagenetic stage and it played a decisive role for increasing the reservoir porosities.Fracturing,hydrothermal dissolution,pressolution,cementation,burial dolomitization,and recrystallization developed in middle-deep burial diagenesis stage.In this period,the dolomitization,hydrothermal dissolution and fracturing were the most important diagenesis for increasing the reservoir porosities.Meanwhile,the recrystallization has a dual character,which has strong destructive effect on fine crystalline dolomite.By comprehensive study,the current study identifies favourable reservoirs.There are 1 region for developing type Ⅰ reservoir,2 regions for developing type Ⅱ reservoir,and 2 regions for developing type Ⅲ reservoir.The areas that grain bank,tidal flat,superimposed fracture development zone,dolomitization,eogenetic dissolution,weathering karst,and hydrothermal dissolution,are most favourable for developing type Ⅰ and type Ⅱ reservoirs.关键词
渤海湾盆地/东濮地区/奥陶系/碳酸盐岩/成岩作用/成岩演化Key words
Bohai Bay Basin/Dongpu area/Ordovician/carbonate/diagenesis/diagenetic evolution分类
天文与地球科学引用本文复制引用
肖菁,季汉成,刘金侠,郭强,杨飞,房超..渤海湾盆地东濮地区奥陶系碳酸盐岩成岩作用及对储集层的影响[J].古地理学报,2018,20(2):299-310,12.基金项目
国家自然科学基金(编号:41502099)、中国石化集团新星石油责任有限公司科技攻关项目(编号:10500000-14-FW0399-0003)及中国地质调查局油气资源调查中心地质调查项目(编号:DD20160182-YQ17W05)联合资助.Co-funded by National Natural Science Foundation of China(No.41502099),the Science and Technology Program of Sinopec Star Petroleum Co.,Ltd.(No.10500000-14-FW0399-0003) and the Geological Survey Program of Oil and Gas Resources Survey Center of China Geological Survey (No.DD20160182-YQ17W05) （编号:41502099）
