鄂尔多斯盆地马岭油田长8_1储层不同成岩相类型可动流体赋存特征分析
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摘要
针对鄂尔多斯盆地马岭油田长8_1储层微观非均质性强、微观孔隙结构复杂、流体分布特征差异性明显等问题,利用核磁共振技术对不同成岩相类型储层可动流体进行定量评价,辅助以常规物性、图像孔隙、铸体薄片、扫描电镜、高压压汞和恒速压汞等微观实验,分析不同类型的成岩相可动流体赋存特征差异性及其主控因素。研究结果表明,研究区主要分成四种成岩相,分别为绿泥石+伊利石胶结-粒间孔相、伊利石+高岭石胶结-粒间孔+溶蚀相、绿泥石+伊利石胶结-溶蚀相和碳酸盐胶结致密相。四种不同成岩相类型的微观孔隙结构有着明显的差异,微观孔隙结构差异是造成可动流体饱和度差异的主要因素。不同成岩相类型的储层渗透率与可动流体参数的相关性较强,储层物性越好,可动流体参数变化幅度越大;孔喉半径大小、孔喉半径比、分选系数、孔喉进汞饱和度以及粘土矿物的充填是影响不同成岩相类型可动流体赋存特征差异的主控因素。其中有效喉道半径、孔喉进汞饱和度、孔喉半径比是影响可动流体饱和度的主要因素,分选系数对可动流体饱和度影响较明显,储层物性对可动流体饱和度的影响较小。
The exploration of the Chang 8_1 reservoir in Maling Oilfield,Ordos Basin,has been challenged by strong heterogeneity,complicated microscopic pore structures,low saturation of movable fluids,and different fluid distribution characteristics. To solve this problem,this study used nuclear magnetic resonance( NMR) technique to quantitatively evaluate the movable fluids in the reservoir with different diagenetic facies types. Moreover,microscopic experiments were conducted to analyze the occurrence characteristics and influential factors of movable fluids in different diagenetic facies types,including conventional physical property analysis,image porosity measurement,casting thin section observation,SEM analysis,high pressure mercury intrusion tests,and rate-controlled mercury intrusion tests. The results show that four types of diagenetic facies could be divided in the area,namely chlorite + illite cementation-intergranular pore facies,illite + kaolinite cementation-intergranular pore + solution facies,chlorite + illite cementation-solution facies and carbonate cementation dense facies. There are obvious differences in the micro-pore structure of these four types of diagenetic facies and micro-pore structure is the main factor that causes the difference of the saturation of movable fluid. Reservoir permeability is well correlated with movable fluid saturation.Generally,better physical properties lead to larger variation of movable fluid saturation. The pore throat radius,pore-throat radius ratio,sorting coefficient,maximum mercury saturation in pores and throats,and interstitial clay minerals are the main factors that influence the occurrence characteristics in different diagenetic facies. Among them,the effective pore throat radius,maximum mercury saturation and pore-throat radius ratio are the dominant factors; the sorting coefficient has a certain influence; and physical properties can pose a little effect on the movable fluid saturation.
The exploration of the Chang 8_1 reservoir in Maling Oilfield,Ordos Basin,has been challenged by strong heterogeneity,complicated microscopic pore structures,low saturation of movable fluids,and different fluid distribution characteristics. To solve this problem,this study used nuclear magnetic resonance( NMR) technique to quantitatively evaluate the movable fluids in the reservoir with different diagenetic facies types. Moreover,microscopic experiments were conducted to analyze the occurrence characteristics and influential factors of movable fluids in different diagenetic facies types,including conventional physical property analysis,image porosity measurement,casting thin section observation,SEM analysis,high pressure mercury intrusion tests,and rate-controlled mercury intrusion tests. The results show that four types of diagenetic facies could be divided in the area,namely chlorite + illite cementation-intergranular pore facies,illite + kaolinite cementation-intergranular pore + solution facies,chlorite + illite cementation-solution facies and carbonate cementation dense facies. There are obvious differences in the micro-pore structure of these four types of diagenetic facies and micro-pore structure is the main factor that causes the difference of the saturation of movable fluid. Reservoir permeability is well correlated with movable fluid saturation.Generally,better physical properties lead to larger variation of movable fluid saturation. The pore throat radius,pore-throat radius ratio,sorting coefficient,maximum mercury saturation in pores and throats,and interstitial clay minerals are the main factors that influence the occurrence characteristics in different diagenetic facies. Among them,the effective pore throat radius,maximum mercury saturation and pore-throat radius ratio are the dominant factors; the sorting coefficient has a certain influence; and physical properties can pose a little effect on the movable fluid saturation.
引文
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Daigle H.,Johnson A..2016.Combing mercury intrusion and nuclear magnetic resonance measurements using percolation theory[J].Transp.Porous Media,111(3):669-679.
Gao Hui,Li Huazhou.2015.Determination of movable fluid percentage and movable fluid porosity in ultra-low permeability sandstone using nuclear magnetic resonance(NMR)technique[J].Journal of Petroleum Science and Engineering,133(9):258-267.
Li Pan,Liu Zhidi,Chen Yuming,Zhao Jiahong.2017.Summarization of application for identifying diagenetic in low porosity and low permeability reservoirs using well-logging information[J].Progress in Geophysics,32(1):183-190(in Chinese with English abstract).
Li Pan,Sun Wei,Gao Yongli,Zhang Xi,Du Kun,Bai Yunyun.2018.Quantitative calculation of tight sandstone reservoir porosity evolution based on different diagenesis:A case study from Chang 81reservoir of Maling area,Ordos basin[J].Geological Science and Technology Infornation,37(1):135-142(in Chinese with English abstract).
Li Y,Fan Y R,Deng S G,Liu B K.2008.Experimental study of pore structure with nuclear magnetic resonance[J].Prog.Explor.Geophys,31(2):129-132.
Liu Jiangbin,Ren Zhanli,Li Wenhou,Hu Cuilin.2017.Diagenesis and porosity evolution in the Chang 81reservoir of the Triassic Yanchang Formation in the Xunyi area,Ordos Basin[J].Geology and Exploration,53(2):0371-0380(in Chinses with English abstract).
Ma Baoquan,Yang Shaochun,Zhang Hong,Bai Qinglin,Yang Zhaolin.2018.Quantitative evaluation of low-permeability sandstone diagenetic facies based on DEA method:A case study of Chang 81reservoirs in the Yanwu region,Ordos basin[J].Journal of China University of Mining&Technology,47(2):373-382(in Chinese with English abstract).
Ma Chunlin,Wang Ruijie,Luo Bilin,Duan Wenbiao,Feng Chunyan,Wang Shaoping,Suo Yuxia,Qiang Zhenzhen.2012.Characteristics of Chang 8 oil reservoir and distribution of oil reservoirs in Maling oilfield,Ordos basin[J].Natural Gas Geoscience,23(3):514-519(in Chinese with English abstract).
Pang Zhenyu,Li Yan,Zhao Xisen,Dang Hailong,Li Jian,Duan Jingjie.2017.Study on movable fluid saturation in ultra low permeability reservoir:taking Chang 6 reservoir in Ganguyi oil field as an example[J].Progress in Geophysics,32(2):0702-0708(in Chinese with English abstract).
Qu Xuefeng,Sun Wei,Lei Qihong,Huang Hai,Huo Lei,Chen Bin.2016.Study on saturation of movable fluid in the low-permeability sandstone reservoirs of Huaqing oilfield and its influencing factors[J].Journal of Xi'an Shiyou University(Natural Science),31(2):93-98(in Chinese with English abstract).
Ren Ying,Sun Wei,Ming Hongxia,Zhang Xi,Huo Lei,Cao Lei,Chen Bin.2016.Characteristics of movable fluids in different diagenetic facies and the influencing factors of low-permeability reservoir:Taking Chang 6 Jiyuan oilfield as an example[J].Geoscience,30(5):1124-1133(in Chinese with English abstract).
Ren Xiaoxia,Li Aifen,Wang Yongzheng,Wu Songtao,Wang Guijuan.2015.Pore structure of tight sand reservoir and its influence on percolation-taking the Chang 8 reservoir in Maling oilfield in Ordos basin as an example[J].Oil&Gas Geology,36(5):774-779(in Chinese with English abstract).
Ren Yinghui,Wu Ke,He Kangning,Wu Guanzhou,Zhu Yalin,Wu Hanning,Yang Youyun.2017.Application of NMR technique to movable fluid of ultra-low permeability and tight reservoir:A case study on the Yanchang Formation in Longdong area,Ordos basin[J].Journal of Mineralogy and Petrology,37(1):103-110.
Shen Jun,Sun Wei,Liu Yanni,Li Gang,Zhang Tao,Cao Lei.2016.Effect of the difference of low permeability reservoir microscopic pore structure on movable fluid:A case for the Chang6 reservoir of Jiyuan and Banqiao areas in Ordos basin[J].Geological Science and Technology Information,35(3):167-172(in Chinese with English abstract).
SY/T 6285-2011.2011.Oil and gas reservoir evaluation methods[S].Beijing:Petroleum Industry Press(in Chinese).
Timur A.1969.Pulsed nuclear magnetic resonance studies of porosity,movable fluid,and permeability of sandstone[J].Pet.Sci.Eng,21:775-786.
Wang Meng,Zeng Ming,Chen Hongao,Yang Gang,Xu Jifang,Qiu Haibin,Guo Hongguang,Wang Jiamin.2017.Influencing factors of tight reservoirs and favorable diagenetic facies:A case study of Chang 8reservoir of the Upper Triassic Yanchang Formation in Maling oilfield,Ordos basin[J].Lithologic Reservoirs,29(1):59-70(in Chinese with English abstract).
Wang Wei,Niu Xiaobing,Liang Xiaowei,Dan Weidong.2017.Study on movable fluid saturation in ultra low permeability reservoir:Taking Chang 6 reservoir in Ganguyi oil field as an example[J].Geological Science and Technology Information,36(1):183-187(in Chinese with English abstract).
Wu Changhui,Zhao Xisen.2017.Determination of T2cut-off value of nuclear magnetic resonance in tight sandstone reservoir and lower limit of movable fluid:A case study of Chang 9 reservoir of Wucangbao oilfield[J].Unconventional Oil&Gas,4(2):91-94(in Chinese with English abstract).
Yang P,Guo H K,Yang D Y.2013.Determination of residue oil saturation during water flooding in tight oil formations with NMR relaxometry measurements[J].Energy Fuels,27(10):5750-5756.
Yao Y,Liu D.2012.Comparison of low-field NMR and mercury intrusion porosimetry in characterizing pore size distributions of coals[J].Fuel,95:152-158.
Zhang Hao,Chen Gang,Tang Xin,Dang Yongchao,Shao Fei,Li Li,Chen Chen,Jia Ran.2017.Evaluation of tight oil reservoir diagenetic facies by logging response:A case study of the Chang 7 reservoir in Heshui area,Ordos basin[J].Geological Science and Technology Information,36(3):262-270(in Chinese with English abstract).
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