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.
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.
[1] 陈书平,漆家福,王德仁,程秀申,赵衍彬,徐振强,解晨,孙海龙. 2007. 东濮凹陷断裂系统及变换构造. 石油学报, 28(1): 43-49. [Chen S P,Qi J F,Wang D R,Cheng X S,Zhao Y B,Xu Z Q,Xie C,Sun H L. 2007. Fault systems and transfer structures in Dongpu Sag. Acta Petrolei Sinica, 28(1): 43-49] [2] 戴朝成,郑荣才,朱如凯,李凤杰,高志勇. 2011. 四川前陆盆地中西部须家河组成岩作用与成岩相. 成都理工大学学报(自然科学版), 38(2): 211-219. [Dai C C,Zheng R C,Zhu R K,Li F J,Gao Z Y. 2011. Diagenesis and diagenetic facies of Xujiahe formation in the central west of Sichuan foreland basin. Journal of Chengdu University of Technology(Science & Technology Edition), 38(2): 211-219] [3] 郭来源,解习农,陈慧. 2014. 碳酸盐岩中与古暴露面相关的成岩作用. 地质科技情报, 33(3): 57-62. [Guo L Y,Xie X N,Chen H. 2014. Diagenesis related to ancient exposed surfaces in carbonate rocks. Geological Science and Technology Information, 33(3): 57-62] [4] 何子江,袁先春. 2003. 东濮凹陷下古生界碳酸盐岩储集层发育特征研究. 煤田地质与勘探, 31(3): 16-19. [He Z J,Yuan X C. 2003. Study of development characteristics of carbonate reservoirs in the Lower Pleaozoic Dongpu Depression. Coal Geology & Exploration, 31(3): 16-19] [5] 纪友亮,冷胜荣. 1994. 东濮地区风化壳储集层特征及油气藏的形成. 石油大学学报(自然科学版), 18(3): 12-18. [Ji Y L,Leng S R. 1994. Reservoir characteristics of weathering crust and gas pool in Dongpu Depression. Journal of China University of Petroleum(Edition of Natural Sciences), 18(3): 12-18] [6] 李君文. 2007. 环渤海湾地区下古生界层序岩相古地理特征及演化. 成都理工大学博士论文. [Li J W. 2007. The characteristic and evolution of sequence: Lithofacies paleogeography of lower Paleozoic around Bohai Gulf area. Doctor Dissertation of Chengdu University of Technology] [7] 刘波,王英华,钱祥麟. 1997. 华北奥陶系两个不整合面的成因与相关区域性储层预测. 沉积学报, 15(1): 26-31. [Liu B,Wang Y H,Qian X L. 1997. The two Ordovician unconformities in N.China:Their origins and related regional reservoirs predicition. Acta Sedimentologica Sinica, 15(1): 26-31] [8] 任军峰,杨文敬,丁雪峰,赵伟波,黄正良,魏柳斌. 2016. 鄂尔多斯盆地马家沟组白云岩储集层特征及成因机理. 成都理工大学学报(自然科学版), 43(3): 274-281. [Ren J F,Yang W J,Ding X F,Zhao W B,Huang Z L,Wei L B. 2016. Discussion on characteristics and origin of Majiagou Formation dolomite reservoir in Ordos Basin,China. Journal of Chengdu University of Technology(Science & Technology Edition), 43(3): 274-281] [9] 时国,田景春,吴永良,张长俊,张翔,杜建波,何明喜. 2010. 南华北地区下古生界碳酸盐岩成岩作用及其对储集层的影响. 地质科技情报, 29(2): 10-15. [Shi G,Tian J C,Wu Y L,Zhang C J,Zhang X,Du J B,He M X. 2010. Lower Paleozoic Carbonate diagenesis feature and controlling over reservoirs in southern North China. Geological Science and Technology Information, 29(2): 10-15] [10] 王英华. 1992. 碳酸盐岩成岩作用与孔隙演化. 沉积学报, 10(3): 85-95. [Wang Y H. 1992. Carbonate diagenesis and porosity evolution. Acta Sedimentologica Sinica, 10(3): 85-95] [11] 肖菁,季汉成,华南,房超,李海泉,马鹏鹏. 2016. 渤海湾盆地东濮地区奥陶系沉积相特征及其演化. 岩性油气藏, 28(6): 78-87. [Xiao J,Ji H C,Hua N,Fang C,Li H Q,Ma P P. 2016. Characteristics and evolution of the Ordovician sedimentary facies in Dongpu area,Bohai Bay Basin. Lithologic Reservoirs, 28(6): 78-87] [12] 姚合法,靳秀菊,张丽华. 2000a. 中原地区奥陶系风化壳储集层控制因素及勘探前景. 断块油气田, 7(3): 5-7. [Yao H F,Jin X J,Zhang L H. 2000a. Control factors of Ordovician weathering crust reservoir in Zhongyuan Region and it's petroleum exploration prospecting. Fault-Block Oil and Gas Field, 7(3): 5-7] [13] 姚合法,张绪教,王生朗,靳秀菊. 2000b. 东濮凹陷及其邻区下古生界碳酸盐岩储集层特征及其控制因素分析. 现代地质, 14(2): 191-196. [Yao H F,Zhang X J,Wang S L,Jin X J. 2000b. Characteristics and control factors analysis of lower Paleozoic carbonate reservoir in the Dongpu depression and its neighbor regions. Geoscience, 14(2): 191-196] [14] 赵国祥,王清斌,杨波,王晓刚,白冰,万琳. 2016. 渤中凹陷奥陶系深埋环境下碳酸盐岩溶蚀成因分析. 天然气地球科学, 27(1): 111-120. [Zhao G X,Wang Q B,Yang B,Wang X G,Bai B,Wan L. Dissolution mechanism analysis of Ordovician carbonate under burial environment of Bozhong Sag,Bohai Sea area. Natural Gas Geoscience, 27(1): 111-120] [15] 张云峰,李忠,王清晨,张庆友. 2005. 鲁西隆起区奥陶系碳酸盐岩成岩作用及其对储集性的控制作用. 地质科学, 40(2): 207-219. [Zhang Y F,Li Z,Wang Q C,Zhang Q Y. 2005. Diagenesis and its role on reservoir of Ordovician carbonate rocks in the West Shandong rise. Chinese Journal of Geology, 40(2): 207-219] [16] 赵甜. 2010. 河南省华北地台晚古生代碳酸盐岩沉积相及古地理特征分析. 中国地质大学(北京)硕士论文. [Zhao T. 2010. Study on the Late Paleozoic carbonate sedimentary facies and palaeogeography in North China Platform within Henan Province. Master Dissertation of China University of Geosciences(Beijing)] [17] 周新科,许化政. 2007. 东濮凹陷地质特征研究. 石油学报, 28(5): 20-26. [Zhou X K,Xu H Z. 2007. Discussion on geological features of Dongpu Depression. Acta Petrolei Sinica, 28(5): 20-26] [18] 邹元荣,金振奎,由伟丰,蒋春雷. 2001. 黄骅坳陷奥陶纪岩相古地理. 古地理学报, 3(4): 35-44. [Zou Y R,Jin Z K,You W F,Jiang C L. 2001. Lithofacies palaeogeography of the Ordovician in Huanghua depression. Journal of Palaeogeography(Chinese Edition), 3(4): 35-44] [19] Choquette P W,Pray L C. 1970. Geologic nomenclature and classification of porosity in sedimentary carbonates. AAPG Bulletin, 54(2): 207-250. [20] Ehrenberg S N,Eberli G P,Keramati M. 2006. Porosity-permeability relationships in interlayered limestone-dolostone reservoirs. AAPG Bulletin, 90(1): 91-114. [21] Enos P,Sawatsky L H. 1981. Pore networks in Holocene carbonate sediments. Journal of Sedimentary Petrology, 51(3): 961-985. [22] Morse J W. 2003. Formation and diagenesis of carbonate sediments. Treatise on Geochemistry, 56(1): 67-85. [23] Swei G H,Tucker M E. 2012. Impact of diagenesis on reservoir quality in ramp carbonates: Gialo Formation(Middle Eocene),Sirt Basin,Libya. Journal of Petroleum Geology, 35(2): 25-47.
