Effective reservoir identification and “sweet spot” optimization of Chang 7 tight oil reservoir in Xin'anbian oil field, Ordos Basin
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摘要: 以鄂尔多斯盆地新安边油田长7油藏试油、生产数据为基础,界定在当前技术条件下能够开发的储层为有效储层,从岩心观察、录井显示、储层实验分析、测井响应等4个方面建立有效储层的识别标准。认为现阶段鄂尔多斯盆地能够开发的致密油储层为孔隙度大于5.5%、渗透率大于0.03×10-3 μm2的油斑细砂岩。有效储层恒速压汞显示喉道半径大于0.25 μm,可动流体饱和度大于30%,测井响应声波时差大于215 μs/m。"甜点"区含油性较好,全烃气测录井气测值为基线的3倍以上,电阻率达到30 Ω·m以上。从钻井允许误差和单井控制储量规模分析,最大单油层厚度应大于4 m,压裂后可动用油层厚度达到6 m以上。有利区筛选过程中按照先从沉积相带进行有利区带优选,然后用储层物性、油层厚度下限标准进行"甜点"筛选,在油藏内部产能建设实施过程中按照含油性、邻井实施效果排序,扣除风险区,避免低产低效区。形成的技术指标和技术方法,在新安边地区提交探明储量1.0×108 t,建成了致密油规模开发区块。Abstract: We proposed criteria whereby tight oil wells can obtain industrial oil flow under the current technical conditions based on the well test results and dynamic production data for Chang 7 tight oil reservoirs in the Xin'anbian oil field of the Ordos Basin. The criteria were established using core observation, petrophysical logging results, reservoir analysis, and well-logging response. We found that the effective fine sandstone formation has porosity greater than 5.5%, and permeability greater than 0.03×10-3 μm2. Mercury injection experiments under constant rate showed that the channel radius is greater than 0.25 μm, the movable fluid saturation is greater than 30%, and the interval acoustic transit time in well logging is larger than 215 μs/m. In the "sweet spot" zone, oil saturation ishigher, and the measured gas value in well cutting logging is 3 times higher than that of the baseline, and the resistivity is greater than 30 Ω·m. The maximum thickness tolerance for a single oil layer in well drilling should be greater than 4 m, and the thickness of multi-layer oil is more than 6 m. In optimization, favorable zones were firstly selected from the sedimentary facies belt, and then the lower limit criteria of reservoir physical properties and layer thickness to make "sweet spot" zone selection. During development, oil saturation and adjacent well performance were considered for reducing the risk of low yield or low efficiency areas. Through the screening analysis of the technical indicators above, the proven oil reserve is up to 100 million tons in the Xin'anbian oil field.
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[1] 吴康军,刘洛夫,徐正建,等.鄂尔多斯盆地长7段致密油成藏物性下限研究[J] 石油实验地质,2016,38(1):63-69. Wu Kangjun,Liu Luofu,Xu Zhengjian,et al.Lower limits of pore throat radius,porosity and permeability for tight oil accumulations in the Chang7 Member,Ordos Basin[J].Petroleum Geology & Experiment,2016,38(1):63-69. [2] 席辉,成志刚,张蕾,等.陇东地区长7致密油储层下限值的确定[J].复杂油气藏,2015,8(2):15-18. Xi Hui,Cheng Zhigang,Zhang Lei,et al.Determination of lower limits for Chang7 tight-oil reservoir in Longdong area[J].Small Hydrocarbon Reservoirs,2015,8(2):15-18. [3] 梁全胜,张志升.陕北下寺湾油区长7致密油储层物性下限的确定[J].非常规油气,2016,3(2):17-21. Liang Quansheng,Zhang Zhisheng.Lower limit determination of Chang 7 tight oil reservoir property in Xiasiwan Oilfield,northern Shaanxi Province[J].Unconventional Oil & Gas,2016,3(2):17-21. [4] 张以明,付小东,郭永军,等.二连盆地阿南凹陷白垩系腾下段致密油有效储层物性下限研究[J].石油实验地质,2016,38(4):551-558. Zhang Yiming,Fu Xiaodong,Guo Yongjun,et al.Petrophysical property limits of effective tight oil reservoirs in the lower part of the first member of Cretaceous Tengger Formation,A'nan Sag,Erlian Basin,North China[J].Petroleum Geology & Experiment,2016,38(4):551-558. [5] 付金华,罗安湘,张妮妮,等.鄂尔多斯盆地长7油层组有效储层物性下限的确定[J].中国石油勘探,2014,19(6):82-88. Fu Jinhua,Luo Anxiang,Zhang Nini,et al.Determine lower limits of physical properties of effective reservoirs in Chang 7 oil formation in Ordos Basin[J].China Petroleum Exploration,2014,19(6):82-88. [6] 王伟明,卢双舫,田伟超,等.吸附水膜厚度确定致密油储层物性下限新方法:以辽河油田大民屯凹陷为例[J].石油与天然气地质,2016,37(1):135-140. Wang Weiming,Lu Shuangfang,Tian Weichao,et al. A new method to determine porosity and permeability cutoffs of tight oil reservoirs by using thickness of adsorption water film:A case study from the Damintun Sag,Liaohe oilfield[J].Oil & Gas Geology,2016,37(1):135-140. [7] 李卫成,张艳梅,王芳,等.应用恒速压汞技术研究致密油储层微观孔喉特征:以鄂尔多斯盆地上三叠统延长组为例[J].岩性油气藏,2012,24(6):60-65. Li Weicheng,Zhang Yanmei,Wang Fang,et al.Application of constant-rate mercury penetration technique to study of pore throat characteristics of tight reservoir:A case study from the Upper Triassic Yanchang Formation in Ordos Basin[J].Litholo-gic Reservoirs,2012,24(6):60-65. [8] 何小鹤.孔隙表征技术及其在储层孔隙结构研究中的应用[J].江汉石油职工大学学报,2016,29(2):4-7. He Xiaohe.Pore characterization technique and its application in reservoir void structure identification[J].Journal of Jianghan Petroleum University of Staff and Workers,2016,29(2):4-7. [9] 陈国军.核磁共振测井在致密油孔隙结构及储层综合评价中的应用[J].测井技术,2015,39(1):57-61. Chen Guojun.Application of NMR data to evaluation of the pore structure and reservoir with tight oil[J].Well Logging Techno-logy,2015,39(1):57-61. [10] 白瑞婷,李治平,王慧玲,等.陇东地区长7致密油储层微观孔喉结构分形特征[J].科学技术与工程,2016,16(5):54-59. Bai Ruiting,Li Zhiping,Wang Huiling,et al.Fractal nature of microscopic pore-throat structure in Chang 7 tight oil reservoir of Longdong area[J].Science Technology and Engineering,2016,16(5):54-59. [11] 祝海华,钟大康,姚泾利,等.鄂尔多斯西南地区长7段致密油储层微观特征及成因机理[J].中国矿业大学学报,2014,43(5):853-863. Zhu Haihua,Zhong Dakang,Yao Jingli,et al.Microscopic characteristics and formation mechanism of Upper Triassic Chang 7 tight oil reservoir in the southwest Ordos Basin[J].Journal of China University of Mining & Technology,2014,43(5):853-863. [12] 李海波,郭和坤,杨正明,等.鄂尔多斯盆地陕北地区三叠系长7致密油赋存空间[J].石油勘探与开发,2015,42(3):396-400. Li Haibo,Guo Hekun,Yang Zhengming,et al.Tight oil occurrence space of Triassic Chang 7 M ember in northern Shaanxi area,Ordos Basin,NW China[J].Petroleum Exploration and Development,2015,42(3):396-400. [13] 屈红军,蒲仁海,曹金舟.鄂尔多斯盆地南部地区长7致密油储层特征[J].非常规油气,2015,2(1):1-9. Qu Hongjun,Pu Renhai,Cao Jinzhou.Characteristics of Chang 7 tight oil reservoir in the southern Ordos Basin[J].Unconventional Oil & Gas,2015,2(1):1-9. [14] 何小娟,郑光辉,郭路,等.安边地区长7致密油储层综合评价[J].低渗透油气田,2015(2):89-93. He Xiaojuan,Zheng Guanghui,Guo Lu,et al.Comprehensive evaluation of tight Chang7 oil reservoirs in Anbian area[J].Low Permeability Oil & Gas Fields,2015(2):89-93. [15] 孙军昌,郭和坤,刘卫,等.低渗火山岩气藏可动流体T2截止值实验研究[J].西南石油大学学报(自然科学版),2010,32(4):109-114. Sun Junchang,Guo Hekun,Liu Wei,et al.Experimental study on the movable fluid T2 cut of value of volcanic gas reservoir[J].Journal of Southwest Petroleum University (Science & Technology Edition),2010,32(4):109-114. [16] 姚宜同,李士祥,赵彦德,等.鄂尔多斯盆地新安边地区长7致密油特征及控制因素[J].沉积学报,2015,33(3):625-632. Yao Yitong,Li Shixiang,Zhao Yande,et al.Characteristics & controlling factors of Chang7 tight oil in Xin'anbian area,Orods Basin[J].Acta Sedimentologica Sinica,2015,33(3):625-632.
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