鄂尔多斯盆地东部府谷天生桥剖面上古生界下石盒子组8段辫状河储层构型表征
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摘要
鄂尔多斯盆地苏里格东部地区上古生界下石盒子组8段(盒8段)为主力产气层,其储层内部构型是控制油气分布的关键地质因素。选取盆地东部与苏东地区具有相似物源体系与沉积环境的府谷天生桥剖面作为研究对象,对该剖面砂体构型进行精细解剖能为苏东地区地质模型的建立提供有效信息。通过剖面实测、岩相分析、构型解剖、砂体规模精确测量等方法,结合沉积学、岩石学特征分析,对府谷天生桥剖面上古生界盒8段辫状河储层构型特征进行了深入研究。结果表明:该剖面盒8段辫状河发育12种岩相类型;其储层内部可划分出复合河道带、单一河道带、单砂体、落淤层及增生体、层系组、层系及纹层等6级构型界面;共识别出河道充填(CH)、纵向砂坝(LB)、斜列砂坝(DB)、横向砂坝(TB)、废弃河道(ACH)和越岸沉积(OF) 6种储层构型单元,其中砂坝作为辫状河主要储层构型单元,纵向砂坝厚度介于2. 5～5. 8m,宽/厚比约为27. 6～37. 7;斜列砂坝厚度介于2. 2～6 m,宽/厚比约为34. 8～42. 1;横向砂坝厚度介于1. 5～3. 6 m,宽/厚比约为47. 0～61. 8。在对不同构型单元分析的基础上,总结了其空间叠置样式,建立了府谷盒8段辫状河复合砂体三维的构型模式,研究成果为苏东地区盒8段气藏精细描述提供了地质依据。
The major gas pay zone lies in the 8 th member of the Upper Paleozoic Lower Shihezi Formation( He 8 member),eastern part of Sulige region,Ordos basin. Its reservoir architecture acts as a predominant geological factor for oil/gas distribution. Targeting at Tianshengqiao outcrop in Fugu county in eastern Ordos Basin,similar to eastern Sulige region in provenance and sedimentary setting,we finely studied the architecture of the outcropped sand body,which can offer critical information for the establishment of geological model of eastern Sulige region. Based on the outcrop survey,petrographic investigation,architecture analysis and fine measurement of sand body volume,combined with the sedimentary and petrologic analyses,we recognized twelve types of lithofacies in the braided river deposits of He 8 member. Six levels of architecture interfaces were classified within the reservoirs,namely composite channel-belt,single channel-belt,single sand body,silty layer accompanied with accretion,bed set,single bed and laminae. Six reservoir architecture units are indentified,that is,channel filling( CH),longitudinal bar( LB),diagonal bar( DB),transverse bar( TB),abandoned channel( ACH) and overflow deposits( OF). Among these,sand bar is a dominant reservoir architecture unit. The thickness of longitudinal bar ranges between 2. 5 m and 5. 8 m with the width/thickness ratio varying from 27. 6 to 37. 7; the thicknessof diagonal bar ranges between 2. 2 m and 6 m with a width/thickness ratio varying from 38. 4 to 42. 1; while the thickness of transverse bar ranges between 1. 5 m and 3. 6 m with a width/thickness ratio varying from 47. 0 to 61. 8. Based on the analyses of different architecture units,we summed up the spatial superimposition patterns of the reservoir,established the 3 D architecture model of braided river composite sand body in the He 8 member of Tianshengqiao outcrop in Fugu county,both of which will provide geological evidences in the fine description of He 8 member in eastern Sulige region.
The major gas pay zone lies in the 8 th member of the Upper Paleozoic Lower Shihezi Formation( He 8 member),eastern part of Sulige region,Ordos basin. Its reservoir architecture acts as a predominant geological factor for oil/gas distribution. Targeting at Tianshengqiao outcrop in Fugu county in eastern Ordos Basin,similar to eastern Sulige region in provenance and sedimentary setting,we finely studied the architecture of the outcropped sand body,which can offer critical information for the establishment of geological model of eastern Sulige region. Based on the outcrop survey,petrographic investigation,architecture analysis and fine measurement of sand body volume,combined with the sedimentary and petrologic analyses,we recognized twelve types of lithofacies in the braided river deposits of He 8 member. Six levels of architecture interfaces were classified within the reservoirs,namely composite channel-belt,single channel-belt,single sand body,silty layer accompanied with accretion,bed set,single bed and laminae. Six reservoir architecture units are indentified,that is,channel filling( CH),longitudinal bar( LB),diagonal bar( DB),transverse bar( TB),abandoned channel( ACH) and overflow deposits( OF). Among these,sand bar is a dominant reservoir architecture unit. The thickness of longitudinal bar ranges between 2. 5 m and 5. 8 m with the width/thickness ratio varying from 27. 6 to 37. 7; the thicknessof diagonal bar ranges between 2. 2 m and 6 m with a width/thickness ratio varying from 38. 4 to 42. 1; while the thickness of transverse bar ranges between 1. 5 m and 3. 6 m with a width/thickness ratio varying from 47. 0 to 61. 8. Based on the analyses of different architecture units,we summed up the spatial superimposition patterns of the reservoir,established the 3 D architecture model of braided river composite sand body in the He 8 member of Tianshengqiao outcrop in Fugu county,both of which will provide geological evidences in the fine description of He 8 member in eastern Sulige region.
引文
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[2] Miall A D. Architectural-element analysis:A new method of facies analysis applied to fluvial deposits[J]. Earth Science Reviews,1985,22(4):261-308.
[3] Miall A D. Architectural elements and bounding surfaces in fluvial deposits:anatomy of the Kayenta Formation(Lower Jurassic),Southwest Colorado[J]. Sedimentary Geology,1988,55(3):233-262.
[4] 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):989-1002.
[5]廖保方,张为民,李列,等.辫状河现代沉积研究与相模式:中国永定河剖析[J].沉积学报,1998,16(1):34-39.Liao Baofang,Zhang Weimin,Li Lie,et al. Study on modern deposit of a braided stream and faces model:Taking the Yongding River as an example[J]. Acta Sedimentologica Sinica,1998,16(1):34-39.
[6]于兴河,马兴祥,穆龙新,等.辫状河储层地质模式及层次界面分析[M].北京:石油工业出版社,2004:92-109.Yu Xinghe,Ma Xingxiang,Mu Longxin,et al. Geological model and hierarchical interface analysis for braided river reservoir[M]. Beijing:Petroleum Industry Press,2004:92-109.
[7]刘钰铭,侯加根,王连敏,等.辫状河储层构型分析[J].中国石油大学学报(自然科学版),2009,33(1):7-11.Liu Yuming,Hou Jiagen,Wang Lianmin,et al. Architecture analysis of braided river reservoir[J]. Journal of China University of Petroleum(Edition of Natural Science),2009,33(1):7-11.
[8]孙天建,穆龙新,吴向红,等.砂质辫状河储层构型表征方法——以苏丹穆格莱特盆地Hegli油田为例[J].石油学报,2014,35(4):715-724.Sun Tianjian,Mu Lonbxin,Wu Xianghong,et al. A quantitative method for architectural characterization of sandy braided-river reservoirs:taking Hegli oilfield of Muglad Basin in Sudan as an example[J]. Acta Petrolei Sinica,2014,35(4):715-724.
[9]吴胜和,纪友亮,岳大力,等.碎屑沉积地质体构型分级方案探讨[J].高校地质学报,2013,19(1):12-22.Wu Shenghe,Ji Youliang,Yue Dali,et al. Discussion on hierarchical scheme of architectural units in elastic deposits[J]. Geological Journal of China Universities,2013,19(1):12-22.
[10]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.
[11]张昌民,尹太举,赵磊,等.辫状河储层内部建筑结构分析[J].地质科技情报,2013,32(4):7-13.Zhang Changmin,Yin Taiju,Zhao Lei,et al. Reservoir architectural a-nalysis of braided channel[J]. Geological Science and Technology Information,2013,32(4):7-13.
[12]王越,陈世悦,李天宝,等.扒楼沟剖面二叠系辫状河砂体构型与非均质性特征[J].中国石油大学学报(自然科学版),2016,40(6):1-8.Wang Yue,Chen Shiyue,Li Tianbao,et al. Braided river sand body architecture and heterogeneity of Permian in Palougou outcrop[J].Journal of China University of Petroleum(Edition of Natural Science),2016,40(6):1-8.
[13]金振奎,杨有星,尚建林,等.辫状河砂体构型及定量参数研究——以阜康、柳林和延安地区辫状河露头为例[J].天然气地球科学,2014,25(3):311-317.Jin Zhenkui,Yang Youxing,Shang Jianlin,et al. Sandbody architecture and quantitative parameters of single channel sandbodies of braided river:Cases from outcrops of braided river in Fukang,Liulin and Yanan areas[J]. Natural Gas Geoscience,2014,25(3):311-317.
[14]陈彬滔,于兴河,王天奇,等.砂质辫状河岩相与构型特征——以山西大同盆地中侏罗统云冈组露头为例[J].石油与天然气地质,2015,36(1):111-117.Chen Bintao,Yu Xinbhe,Want Tianqi,et a1. Lithofacies and architectural characteristics of sandy braided river deposits:a case from outcrops of the Middle Jurassic Yungang Formation in the Datong Basin,Shanxi province[J]. Oi1&Gas Geology,2015,36(1):111-117.
[15]李俊飞,霍春亮,叶小明,等.渤海海域L油田砂质辫状河储层构型特征[J].油气地质与采收率,2017,24(6):48-53.Li Junfei,Huo Chunliang,Ye Xiaoming,et a1. Internal architecture characteristics of sandy braided-river reservoirs in L Oilfield,Bohai Bay Basin[J]. Petroleum Geology and Recovery Efficiency,2017,24(6):48-53.
[16]黄文松,陈和平,李胜利,等.基于水平井信息的辫状河岩相单元与砂体定量研究——以委内瑞拉奥里诺科重油带MPE3区块为例[J].石油与天然气地质,2018,39(2):409-418.Huang Wensong,Chen Heping,Li Shengli,et al. Quantification of braided-river lithofacies units and sandbody based on horizontal well data:A case of MPE3 block in Orinoco heavy-oil zone,Venezuela[J]. Oil&Gas Geology,2018,39(2):409-418.
[17]杨华,刘新社,孟培龙.苏里格地区天然气勘探新进展[J].天然气工业,2011,31(2):1-8.Yang Hua,Liu Xinshe,Meng Peilong. New development in natural gas exploration of the Sulige Gas Fields[J]. Natural Gas Industry,2011,31(2):1-8.
[18]杨华,付金华,刘新社,等.鄂尔多斯盆地上古生界致密气成藏条件与勘探开发[J].石油勘探与开发,2012,39(3):295-303.Yang Hua,Fu Jinhua,Liu Xinshe,et al. Accumlation conditions and exploration and development of tight gas in the Upper Paleozoic of the Ordos Basin[J]. Petroleum Exploration and Development,2012,39(3):295-303.
[19]王国亭,贾爱林,闫海军,等.苏里格致密砂岩气田潜力储层特征及可动用性评价[J].石油与天然气地质,2017,38(5):896-904.Wang Guoting,Jia Ailin,Yan Haijun,et al. Characteristics and recoverability evaluation on the potential reservoir in Sulige tight sandstone gas field[J]. Oil&Gas Geology,2017,38(5):896-904.
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