鄂尔多斯盆地BLC地区长2储层非均质性研究
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摘要
鄂尔多斯盆地BLC地区经过近十年的勘探和开发,目前油区已经进入高含水阶段,储层水淹情况及剩余油分布情况复杂,急需开展储层非均质性研究工作,揭示剩余油富集规律,为下一步注水开发及注采井网调整提供科学依据。
本文针对上述问题,在继承前人研究的基础上,以研究区内230余口开发井的钻井和测井资料为基础,应用沉积学、石油地质学、地球物理测井及油藏开发地质学等多学科的新方法与新理论,通过对岩心观察分析结合铸体薄片、扫描电镜、压汞分析等室内分析化验手段的综合分析,对BLC油区延长组长2地层进行了小层精细划分与对比、沉积微相、储层非均质性及剩余油富集规律分析等研究工作,最终对储层非均质性进行了综合评价和分类。
研究区长2油层组属于曲流河三角洲平原亚相沉积,主要微相为点砂坝、天然堤和泛滥平原,其中点砂坝砂体为主要储集体；长2油层组储集层岩石类型为中-细粒长石砂岩；胶结物主要为自生绿泥石和方解石；孔隙类型主要为粒间孔和溶蚀孔；压汞曲线形态总体表现为低排驱压力、中等的分选、略偏粗歪度及低退汞效率的特点,属大孔隙细喉道类型。
研究区储层的层内与层间渗透率非均质性整体较弱,但该区隔夹层广泛发育,其不规律分布对层内与层间非均质性影响较大；平面上砂体连续性及连通性均具有较高的程度；通过分析储层非均质性的影响因素,选取微构造、孔隙度、渗透率、油层有效厚度以及隔夹层分布特征为优选参数,应用储层综合非均质性法对BLC油区进行综合评价与分类,并指出剩余油分布模式,以便为今后的勘探和剩余油挖掘提供借鉴和参考。
After about ten years of oil and gas exploration at Bailangcheng area in Ordos Basin, which now have been at the stage of high water-cut. Because of complex of the distribution of the flooding situation and remaining oil, so needed research on reservoir heterogeneity urgently, revealed the accumulation of remaining oil, offer to scientific foundation for further water-flood development and water flood pattern adjustment.
To solve the above problems, in succession on the basis of previous studies,based on analysis of a great deal of data of drilling and logging results of more than 230 development wells, many new theories and technological methods related to sedimentology, petroleum geology, geophysical logging and reservoir development geology are used in the paper, during the course of the study, many experimental analysis have been taken, such as thin section analysis, SEMP and mercury penetration analysis, ect. A series of studies of Chang 2 reservoir of Bailangcheng oil field have been carried, including fine stratigraphic classification and correlation, sedimentary micro facies, reservoir heterogeneity and accumulation of remaining oil, comprehensive evaluation and classification of the reservoir finally.
Chang 2 reservoir of the study area is belonged to deltaic plain sub-facies of meandering steam, and the dominant sedimentary microfacies are point bar, natural barrier and flood plain,the point bar is the main reservoir bodies. The rock type is middle-fine grain feldspar sandstone. Cementing materials include self-generation chlorite and calcite,the intergranular pores and the denudation pores is the main pore space. The result of the mercury penetration experiment suggest that the reservoir has a characteristic of low initial expulsion pressure, moderate degree of sorting, slightly more coarse skewness and low ejection efficency, the communication of pore space is belongs to macro pore with thin pore throat type.
The study reservoir has weak heterogeneity in both of in layer heterogeneity and interlamination with indistinct permeability aeolotropism, but the irregular distribution of interlayer have a great impact on the reservoir. Connectivity have a high degree of plane sand body. In the analysis of the impact of on the basis reservoir heterogeneity factors, according to the Reservoir Heterogeneity Indicator, the sandstone reservoir of Bailangcheng oil field can be comprehensive evaluation and classification, such as microtectonics, porosity, permeability,effective net sand and interlayer distribution, indicate remaining oil distribution, in order for future exploration and mining of remaining oil to provide scientific reference.
本文针对上述问题,在继承前人研究的基础上,以研究区内230余口开发井的钻井和测井资料为基础,应用沉积学、石油地质学、地球物理测井及油藏开发地质学等多学科的新方法与新理论,通过对岩心观察分析结合铸体薄片、扫描电镜、压汞分析等室内分析化验手段的综合分析,对BLC油区延长组长2地层进行了小层精细划分与对比、沉积微相、储层非均质性及剩余油富集规律分析等研究工作,最终对储层非均质性进行了综合评价和分类。
研究区长2油层组属于曲流河三角洲平原亚相沉积,主要微相为点砂坝、天然堤和泛滥平原,其中点砂坝砂体为主要储集体；长2油层组储集层岩石类型为中-细粒长石砂岩；胶结物主要为自生绿泥石和方解石；孔隙类型主要为粒间孔和溶蚀孔；压汞曲线形态总体表现为低排驱压力、中等的分选、略偏粗歪度及低退汞效率的特点,属大孔隙细喉道类型。
研究区储层的层内与层间渗透率非均质性整体较弱,但该区隔夹层广泛发育,其不规律分布对层内与层间非均质性影响较大；平面上砂体连续性及连通性均具有较高的程度；通过分析储层非均质性的影响因素,选取微构造、孔隙度、渗透率、油层有效厚度以及隔夹层分布特征为优选参数,应用储层综合非均质性法对BLC油区进行综合评价与分类,并指出剩余油分布模式,以便为今后的勘探和剩余油挖掘提供借鉴和参考。
After about ten years of oil and gas exploration at Bailangcheng area in Ordos Basin, which now have been at the stage of high water-cut. Because of complex of the distribution of the flooding situation and remaining oil, so needed research on reservoir heterogeneity urgently, revealed the accumulation of remaining oil, offer to scientific foundation for further water-flood development and water flood pattern adjustment.
To solve the above problems, in succession on the basis of previous studies,based on analysis of a great deal of data of drilling and logging results of more than 230 development wells, many new theories and technological methods related to sedimentology, petroleum geology, geophysical logging and reservoir development geology are used in the paper, during the course of the study, many experimental analysis have been taken, such as thin section analysis, SEMP and mercury penetration analysis, ect. A series of studies of Chang 2 reservoir of Bailangcheng oil field have been carried, including fine stratigraphic classification and correlation, sedimentary micro facies, reservoir heterogeneity and accumulation of remaining oil, comprehensive evaluation and classification of the reservoir finally.
Chang 2 reservoir of the study area is belonged to deltaic plain sub-facies of meandering steam, and the dominant sedimentary microfacies are point bar, natural barrier and flood plain,the point bar is the main reservoir bodies. The rock type is middle-fine grain feldspar sandstone. Cementing materials include self-generation chlorite and calcite,the intergranular pores and the denudation pores is the main pore space. The result of the mercury penetration experiment suggest that the reservoir has a characteristic of low initial expulsion pressure, moderate degree of sorting, slightly more coarse skewness and low ejection efficency, the communication of pore space is belongs to macro pore with thin pore throat type.
The study reservoir has weak heterogeneity in both of in layer heterogeneity and interlamination with indistinct permeability aeolotropism, but the irregular distribution of interlayer have a great impact on the reservoir. Connectivity have a high degree of plane sand body. In the analysis of the impact of on the basis reservoir heterogeneity factors, according to the Reservoir Heterogeneity Indicator, the sandstone reservoir of Bailangcheng oil field can be comprehensive evaluation and classification, such as microtectonics, porosity, permeability,effective net sand and interlayer distribution, indicate remaining oil distribution, in order for future exploration and mining of remaining oil to provide scientific reference.
引文
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