基于DEA定量表征低渗透砂岩储层成岩相——以鄂尔多斯盆地演武地区延长组8~1段为例
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摘要
成岩相是控制储层质量的主要因素之一,成岩相的定量表征对储层区域评价和预测具有重要作用.本文以鄂尔多斯盆地演武地区延长组81段储层为研究对象,选择与岩石学特征参数、成岩作用强度和孔隙发育程度等相关的15个成岩相定量评价参数,利用数据包络分析法(DEA)定量表征成岩相;以研究区内各成岩相对应储层为表征单元,利用区内各成岩相的表征参数构成评价群体并确立数学模型,综合考虑影响成岩相定量表征的每个参数进行线性规划模型求解.研究结果表明:5种成岩相指数的分布区间分别为1.00~0.85,0.85~0.60,0.60~0.50,0.50~0.35,0.35~0,具有很好的区间对应关系,且成岩相指数与吸水强度呈现正相关,与剩余油饱和度呈现负相关.其中有利成岩相为绿泥石衬边弱溶蚀成岩相和不稳定组分溶蚀成岩相,指数在1.00~0.60,其孔喉配置关系相对较好,孔隙度主要分布在10%~17%,渗透率大体分布在0.50~10.00mD,驱油效率较高,剩余油饱和度较低.
Diagenetic facies is one of the main factors controlling the reservoir quality.The quantitative characterization of diagenetic facies plays an important role in reservoir evaluation and prediction.This paper selected Chang 81 reservoir of Yanwu area in Ordos basin as the objective layer,quantitatively evaluated the diagenetic facies by applying the data envelopment analysis(DEA)on 15 selected parameters relevant to petrographic characteristics,diagenetic processes and pore structure etc.Taking the corresponding reservoirs of the diagenetic facies as the characterization units,the evaluation group and the numerical model were established by characterization parameters of all diagenetic facies.Then each parameter affecting the quantitative characterization was considered to solve the linear programming model.The results suggest that there are five intervals of diagenetic facies indexes,they are 1.00—0.85,0.85—0.60,0.60—0.50,0.50—0.35 and 0.35—0,which have good relationship corresponding to the diagenetic facies.The diagenetic facies indexes show a positive correlation with the absorption intensity and a negative correlation with the residual oil saturation.The diagenetic facies of weak corrosion with chlorite mat and of corrosion with unstable components are favorable reservoirs in the Yanwu region.The diagenetic facies indexes of them range from 1.00 to 0.60,with higher oil displacement efficiency and lower residual oil saturation.The pore-throat system is good,with the porosity ranging from 10% to 17% and the permeability ranging from0.50 to 10.00 mD.
Diagenetic facies is one of the main factors controlling the reservoir quality.The quantitative characterization of diagenetic facies plays an important role in reservoir evaluation and prediction.This paper selected Chang 81 reservoir of Yanwu area in Ordos basin as the objective layer,quantitatively evaluated the diagenetic facies by applying the data envelopment analysis(DEA)on 15 selected parameters relevant to petrographic characteristics,diagenetic processes and pore structure etc.Taking the corresponding reservoirs of the diagenetic facies as the characterization units,the evaluation group and the numerical model were established by characterization parameters of all diagenetic facies.Then each parameter affecting the quantitative characterization was considered to solve the linear programming model.The results suggest that there are five intervals of diagenetic facies indexes,they are 1.00—0.85,0.85—0.60,0.60—0.50,0.50—0.35 and 0.35—0,which have good relationship corresponding to the diagenetic facies.The diagenetic facies indexes show a positive correlation with the absorption intensity and a negative correlation with the residual oil saturation.The diagenetic facies of weak corrosion with chlorite mat and of corrosion with unstable components are favorable reservoirs in the Yanwu region.The diagenetic facies indexes of them range from 1.00 to 0.60,with higher oil displacement efficiency and lower residual oil saturation.The pore-throat system is good,with the porosity ranging from 10% to 17% and the permeability ranging from0.50 to 10.00 mD.
引文
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[16]张创,孙卫,高辉,等.鄂尔多斯盆地华池长8储层成岩相与孔隙度演化[J].地球科学(中国地质大学学报),2014,39(4):411-420.ZHANG Chuang,SUN Wei,GAO Hui,et al.Reservoir diagenetic facies and porosity evolution pathways of chang 8formation in Huachi,Ordos basin[J].Editorial Committee of Earth Science(Journal of China University of Geosciences),2014,39(4):411-420.
[17]邹才能,张光亚,陶士振,等.全球油气勘探领域地质特征、重大发现及非常规石油地质[J].石油勘探与开发,2010,37(2):129-145.ZOU Caineng,ZHANG Yaguang,TAO Shizhen,et al.Formation,distribution,potential and prediction of global conventional and unconventional hydrocarbon resources[J].Petroleum Exploration and Development,2010,37(2):129-145.
[18]孟元林,高建军,刘德来,等.渤海湾盆地西部凹陷南段成岩相分析与优质储层预测[J].沉积学报,2006,24(2):185-189.MENG Yuanlin,GAO Jianjun,LIU Delai,et al.Diagenetic facies analysis and high-quality reservoir prediction in the southern Xibu depression of the Bohaiwan basin[J].Acta Sedimentologica Sinica,2006,24(2):185-192.
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