Diagenesis and its effect to carbonate reservoirs of the Ordovician in Dongpu area, Bohai Bay Basin
Xiao Jing1, Ji Han-Cheng2, Liu Jin-Xia3, Guo Qiang1, Yang Fei4, Fang Chao4
1 Beijing Research Institute of Uranium Geology,Beijing 100029; 2 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249; 3 New Energy Researching Institute of Star Petroleum Co.,Ltd.,SINOPEC,Beijing 100089; 4 Institute of Petroleum Exploration and Development,Zhongyuan Oilfield Co.,Ltd.,SINOPEC,Zhengzhou 450000,Henan;
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.
Fund:[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)]
About author: Xiao Jing,born in 1990,graduated from China University of Petroleum(Beijing) with her master's degree in 2017. She in mainly engaged in sedimentology and evaluation of reservoirs. E-mail:shawjingbao@sina.com.
Cite this article:
Xiao Jing,Ji Han-Cheng,Liu Jin-Xia et al. Diagenesis and its effect to carbonate reservoirs of the Ordovician in Dongpu area, Bohai Bay Basin[J]. JOPC, 2018, 20(2): 299-310.
Xiao Jing,Ji Han-Cheng,Liu Jin-Xia et al. Diagenesis and its effect to carbonate reservoirs of the Ordovician in Dongpu area, Bohai Bay Basin[J]. JOPC, 2018, 20(2): 299-310.
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