Architecture and Prediction of Clastic Reservoirs in Offshore Oilfields With Sparse Well Pattern: A Case Study on L14 Oilfield in Lufeng Sag in Pearl River Mouth Basin

doi:10.7657/XJPG20220504

Abstract

Abstract:

Offshore oilfields are characterized by large well spacing, sparse well pattern, and strong reservoir heterogeneity. Taking the 5th member of Wenchang formation (Wen 5 member) of Paleogene in L14 oilfield, Lufeng sag, Pearl River Mouth basin, as an example, a method for characterizing the architectures of continental braided river delta reservoirs based on “hierarchy constraint, subdivided dissection, pattern fitting, logging-seismic cross-feedback and multidimensional coordination” was proposed. By using frequency-dividing RGB fusion technology, the architecture units of the reservoirs were characterized. On the basis of reservoir architecture division, high-quality reservoirs were predicted. The results show that the third-order architecture unit in the study area is composite distributary bar, and the fourth-order architecture unit is composed of distributary bar, distributary channel and braided channel. The fourth-order architecture unit is found with three vertical stacking styles and two lateral splicing styles. The rock mineral components and architecture units play a leading role on physical properties. In the Wen 5 member, Class Ⅰ reservoirs are dominant and mostly distributed in distributary bars; Class Ⅱ reservoirs are mainly distributed in the outer edge of Class Ⅰ reservoirs, with poor continuity; and Class Ⅲ reservoirs are often associated with Class II reservoirs, with the poorest continuity. From the center to the outer edge of the distributary bar, and then to the distributary channel and braided channel between the distributary bars, the reservoir quality gradually decreases.

Key words: Pearl River Mouth basin, Lufeng sag, offshore oilfield, reservoir architecture, low-porosity and low-permeability reservoir, architecture unit, reservoir prediction

CLC Number:

DAI Jianwen, ZHANG Wei, WANG Hua, YANG Jiao, TU Yi, LI Qi. Architecture and Prediction of Clastic Reservoirs in Offshore Oilfields With Sparse Well Pattern: A Case Study on L14 Oilfield in Lufeng Sag in Pearl River Mouth Basin[J]. Xinjiang Petroleum Geology, 2022, 43(5): 526-536.

Figures/Tables 9

Fig. 1.

Fig. 2.

Fig. 3.

Fig. 4.

Fig. 5.

Fig. 6.

Table 1.

Fig. 7.

Fig. 8.

References 28

[1]	张文昭, 张厚和, 李春荣, 等. 珠江口盆地油气勘探历程与启示[J]. 新疆石油地质, 2021, 42(3):346-352.
	ZHANG Wenzhao, ZHANG Houhe, LI Chunrong, et al. Petroleum exploration history and enlightenment in Pearl River Mouth basin[J]. Xinjiang Petroleum Geology, 2021, 42(3):346-352.
[2]	MIALL A D. Architectural-element analysis:a new method of facies analysis applied to fluvial deposits[J]. Earth Science Reviews, 1985, 22(2):261-308. doi: 10.1016/0012-8252(85)90001-7
[3]	MIALL A D. Hierarchies of architectural units in terrigenous clastic rocks,and their relationship to sedimentation rate[C]. MIALL A D,TYLER N. The three-dimensional facies architecture of terrigenous clastic sediments,and its implications for hydrocarbon discovery and recovery. Society of Economic Paleontologists and Mineralogists,Concepts in Sedimentology and Paleontology, 1991, 3:6-12.
[4]	MIALL A D. The geology of fluvial deposits:sedimentary facies,basin analysis and petroleum geology[M]. New York: Springer-Verlag Berlin,Heidelberg, 1996:74-98.
[5]	GIBLING M R. Width and thickness of fluvial channel bodies and valley fills in the geological record:a literature compilation and classification[J]. Journal of Sedimentary Research, 2006, 76(5):731-770. doi: 10.2110/jsr.2006.060
[6]	MIALL A D. Reconstructing the architecture and sequence stratigraphy of the preserved fluvial record as a tool for reservoir development:a reality check[J]. AAPG Bulletin, 2006, 90(7):989-1 002.
[7]	薛培华. 河流点坝相储层模式概论[M]. 北京: 石油工业出版社, 1991:51-63.
	XUE Peihua. Introduction to reservoir model of point bar facies in river[M]. Beijing: Petroleum Industry Press, 1991:51-63.
[8]	QIU Yi’nan, XUE Peihua, XIAO Jingxiu. Fluvial sandstone bodies as hydrocarbon reservoirs in lake basin[C]// ETHRIDGE F G,FLORES R M,HARVEY M D. Recent development in fluvial sedimentology. SEPM Society for Sedimentary Geology. Special Publication, 1987, 39:329-342.
[9]	涂乙, 闫正和, 戴建文, 等. 中国南海珠江口盆地西江油田运聚再生油藏模式创新认识与挖潜效果[J]. 石油与天然气地质, 2021, 42(2):522-532.
	TU Yi, YAN Zhenghe, DAI Jianwen, et al. New understanding and tapping effect of remaining oil reservoirs in Xijiang oilfield,PRBM,South China sea[J]. Oil & Gas Geology, 2021, 42(2):522-532.
[10]	牛博, 高兴军, 赵应成, 等. 古辫状河心滩坝内部构型表征与建模:以大庆油田萨中密井网区为例[J]. 石油学报, 2015, 36(1):89-100. doi: 10.7623/syxb201501011
	NIU Bo, GAO Xingjun, ZHAO Yingcheng, et al. Architecture characterization and modeling of channel bar in paleo-braided river:a case study of dense well pattern area of Sazhong in Daqing oilfield[J]. Acta Petrolei Sinica, 2015, 36(1):89-100.
[11]	贾珍臻, 林承焰, 董春梅, 等. 大庆升平油田葡萄花油层葡一油组浅水三角洲储层构型研究[J]. 中国石油大学学报(自然科学版), 2014, 38(6):9-17.
	JIA Zhenzhen, LIN Chengyan, DONG Chunmei, et al. Shallow delta reservoir architecture analysis on Putaohua oil formation in Shengping oilfield[J]. Journal of China University of Petroleum(Edition of Natural Science), 2014, 38(6):9-17.
[12]	何传亮, 康建云, 王辛, 等. 基于沉积微相-储集空间类型的储集层流动单元划分:以彭州气田雷口坡组碳酸盐岩储集层为例[J]. 新疆石油地质, 2020, 41(4):435-443.
	HE Chuanliang, KANG Jianyun, WANG Xin, et al. Reservoir flow unit division based on sedimentary microfacies-reservoir space type:a case of carbonate reservoir of Leikoupo formation in Pengzhou gas field[J]. Xinjiang Petroleum Geology, 2020, 41(4):435-443.
[13]	胡光义, 范廷恩, 陈飞, 等. 复合砂体构型理论及其生产应用[J]. 石油与天然气地质, 2018, 39(1):1-10.
	HU Guangyi, FAN Ting’en, CHEN Fei, et al. Theory of composite sand body architecture and its application to oilfield development[J]. Oil & Gas Geology, 2018, 39(1):1-10.
[14]	霍春亮, 叶小明, 高振南, 等. 储层内部小尺度构型单元界面等效表征方法[J]. 中国海上油气, 2016, 28(1):54-59.
	HUO Chunliang, YE Xiaoming, GAO Zhennan, et al. Equivalent characterization method of small scale reservoir configuration unit interface[J]. China Offshore Oil and Gas, 2016, 28(1):54-59.
[15]	万琼华, 刘伟新, 王华, 等. 珠江口盆地陆丰凹陷辫状河三角洲前缘储层沉积构型模式[J]. 天然气地球科学, 2019, 30(12):1 732-1 742.
	WAN Qionghua, LIU Weixin, WANG Hua, et al. Research on sedimentary architecture pattern of braided river delta front of Lufeng depression in Pearl River Mouth basin[J]. Natural Gas Geoscience, 2019, 30(12):1 732-1 742.
[16]	胡光义, 王海峰, 范廷恩, 等. 海上油田河流相复合砂体构型级次解析[J]. 古地理学报, 2021, 23(4):810-823.
	HU Guangyi, WANG Haifeng, FAN Ting’en, et al. Analysis of fluvial compound sand-body architecture hierarchy in offshore oil field[J]. Journal of Palaeogeography, 2021, 23(4):810-823.
[17]	李俊飞, 王鹏飞, 尚宝兵, 等. 基于储层构型的三角洲前缘剩余油分布规律:以渤海湾盆地S 油田东营组二段下亚段Ⅰ油组为例[J]. 断块油气田, 2019, 26(5):580-586.
	LI Junfei, WANG Pengfei, SHANG Baobing, et al. Remaining oil distribution of delta front based on reservoir architecture:a case study ofⅠoil formation of E₃d₂L in S oilfield,Bohai Bay basin[J]. Fault-Block Oil & Gas Field, 2019, 26(5):580-586.
[18]	权勃, 侯东梅, 牟松茹, 等. 基于水平井信息的辫状河储层构型单元空间展布研究[J]. 中国海上油气, 2020, 32(4):96-103.
	QUAN Bo, HOU Dongmei, MOU Songru, et al. Study on configuration unit spatial distribution of braided river reservoirs based on horizontal well information[J]. China Offshore Oil and Gas, 2020, 32(4):96-103.
[19]	刘海, 林承焰, 张宪国, 等. 孔店油田馆陶组辫状河储层构型及剩余油分布规律[J]. 吉林大学学报(地球科学版), 2018, 48(3):665-677.
	LIU Hai, LIN Chengyan, ZHANG Xianguo, et al. Reservoir architecture and remaining oil distribution in braided river of Guantao formation,Kongdian oilfield[J]. Journal of Jilin University(Earth Science Edition), 2018, 48(3):665-677.
[20]	瞿雪姣, 李继强, 张吉, 等. 辫状河致密砂岩储层构型单元定量表征方法[J]. 吉林大学学报(地球科学版), 2018, 48(5):1 342-1 352.
	QU Xuejiao, LI Jiqiang, ZHANG Ji, et al. Quantitative characterization of reservoir architecture units of braided river tight sandstone reservoirs[J]. Journal of Jilin University(Earth Science Edition), 2018, 48(5):1 342-1 352.
[21]	朱义东, 李威, 王要森, 等. 海上特高含水期油田精细油藏描述技术及应用:以陆丰油田海陆过渡相A油藏为例[J]. 中国海上油气, 2020, 32(5):91-99.
	ZHU Yidong, LI Wei, WANG Yaosen, et al. Fine reservoir description and its application in offshore ultra-high water-cut oilfields:taking the marine-continent transitional facies A reservoir of Lufeng oilfield as an example[J]. China Offshore Oil and Gas, 2020, 32(5):91-99.
[22]	ZENG Hongliu, BACKUS M M. Interpretive advantages of 90°-phase wavelets:part 1-modeling[J]. Geophysics, 2005, 70(3):7-15.
[23]	ZENG Hongliu. Frequency-dependent seismic-stratigraphic and facies interpretation[J]. AAPG Bulletin, 2013, 97(2):201-221. doi: 10.1306/06011212029
[24]	吴胜和, 翟瑞, 李宇鹏. 地下储层构型表征:现状与展望[J]. 地学前缘, 2012, 19(2):15-23.
	WU Shenghe, ZHAI Rui, LI Yupeng. Subsurface reservoir architecture characterization:current status and prospects[J]. Earth Science Frontiers, 2012, 19(2):15-23.
[25]	李婷婷, 王钊, 马世忠, 等. 地震属性融合方法综述[J]. 地球物理学进展, 2015, 30(1):378-385.
	LI Tingting, WANG Zhao, MA Shizhong, et al. Summary of seismic attributes fusion method[J]. Progress in Geophysics, 2015, 30(1):378-385.
[26]	丁峰, 年永吉, 王治国, 等. 地震多属性RGBA颜色融合技术的应用研究[J]. 石油物探, 2010, 49(3):248-252.
	DING Feng, NIAN Yongji, WANG Zhiguo, et al. Application of seismic multi-attributes RGBA color blending[J]. Geophysical Prospecting for Petroleum, 2010, 49(3):248-252.
[27]	张军华, 朱焕, 高荣涛, 等. 地震复合属性:地震属性提取与解释新方法[J]. 新疆石油地质, 2007, 28(4):494-496.
	ZHANG Junhua, ZHU Huan, GAO Rongtao, et al. Compound attribute as new method for pickup and interpretation of seismic attributes[J]. Xinjiang Petroleum Geology, 2007, 28(4):494-496.
[28]	吴胜和, 岳大力, 刘建民, 等. 地下古河道储层构型的层次建模研究[J]. 中国科学 D辑:地球科学, 2008, 38(增刊Ⅰ):111-121.
	WU Shenghe, YUE Dali, LIU Jianmin, et al. Hierarchical modeling of underground paleochannel reservoir configuration[J]. Science in China Series D:Earth Sciences, 2008, 38(Supp.):111-121.