联合压汞法的致密储层微观孔隙结构及孔径分布特征:以鄂尔多斯盆地吴起地区长6储层为例
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摘要
运用铸体薄片、扫描电镜、X衍射技术以及将高压压汞与恒速压汞联合的方法,对鄂尔多斯盆地吴起地区长6段致密储层的微观孔隙结构展开了研究。对其中10件样品的实验结果进行了分析讨论,结果表明:高压压汞与恒速压汞描述相同的进汞过程,可以将所得孔径分布进行联合并得到表征范围在3×10~(-3)～4×10~2μm的总孔径分布曲线图。图像显示10块样品在孔喉半径80～160μm处存在一个较低峰值,在3.7×10~(-3)～2.6μm范围各样品曲线出现多个峰。孔径分布频率直方图结果显示孔隙类型多集中于纳米孔、微孔以及巨孔,且纳米孔最为发育。纳米孔对物性的影响主要表现在:纳米孔控制的孔隙空间随孔隙度、渗透率减小有增大趋势,与渗透率相关性差。纳米孔对渗透率的贡献随着渗透率的减小而增大,且相关性较好。
This paper studies the microscopic pore structure of the Chang 6 reservoir in the Chang 6 section of the Wuqi area in Ordos Basin. The study uses the casting lamella, scanning electron microscopy(SEM), X-ray diffraction techniques, and methods for combining constant-pressure mercury injection with constant-rate mercury injection. The experiment results of 10 samples were analyzed and discussed. The pore size distributions obtained by the two methods of mercury intrusion were superimposed to obtain a total pore size distribution curve in the range of 3×10~(-3) μm to 4×10~2 μm. The results show that high-pressure mercury injection and constant-pressure mercury injection describe the same mercury injection process. The pore size distribution obtained from the high-pressure mercury intrusion and constant-rate mercury intrusion experiments can be combined. The total pore size distribution diagram shows that 10 samples have a lower peak at a pore radius of 80-160 μm, and in the range of 3.7×10~(-3) μm to 2.6 μm, there are multiple peaks in each sample curve. The pore size distribution frequency histogram results show that the pore types of the samples in this area are mostly concentrated in nanopores, micropores, and macropores. The nanopores are the most developed. The effect of nanopores on physical properties is mainly reflected in the fact that the pore space controlled by nanopores increases with decreasing porosity and permeability, and has poor correlation with permeability. The permeability contribution of nanopores increases with the decrease of permeability, and has a good correlation.
This paper studies the microscopic pore structure of the Chang 6 reservoir in the Chang 6 section of the Wuqi area in Ordos Basin. The study uses the casting lamella, scanning electron microscopy(SEM), X-ray diffraction techniques, and methods for combining constant-pressure mercury injection with constant-rate mercury injection. The experiment results of 10 samples were analyzed and discussed. The pore size distributions obtained by the two methods of mercury intrusion were superimposed to obtain a total pore size distribution curve in the range of 3×10~(-3) μm to 4×10~2 μm. The results show that high-pressure mercury injection and constant-pressure mercury injection describe the same mercury injection process. The pore size distribution obtained from the high-pressure mercury intrusion and constant-rate mercury intrusion experiments can be combined. The total pore size distribution diagram shows that 10 samples have a lower peak at a pore radius of 80-160 μm, and in the range of 3.7×10~(-3) μm to 2.6 μm, there are multiple peaks in each sample curve. The pore size distribution frequency histogram results show that the pore types of the samples in this area are mostly concentrated in nanopores, micropores, and macropores. The nanopores are the most developed. The effect of nanopores on physical properties is mainly reflected in the fact that the pore space controlled by nanopores increases with decreasing porosity and permeability, and has poor correlation with permeability. The permeability contribution of nanopores increases with the decrease of permeability, and has a good correlation.
引文
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[14] 黎盼,孙卫,高永利,等.致密砂岩储层差异性成岩演化对孔隙度定量演化表征影响:以鄂尔多斯盆地马岭地区长81储层为例[J].地质科技情报,2018,37(1):135-142.
[15] 郑庆华,柳益群.鄂尔多斯盆地华庆地区延长组长4+5致密油层成岩作用及成岩相[J].地球科学进展,2015,30(1):78-90.
[16] 喻建,马捷,路俊刚,等.压汞—恒速压汞在致密储层微观孔喉结构定量表征中的应用:以鄂尔多斯盆地华池-合水地区长7储层为例[J].石油实验地质,2015,37(6):789-795.
[17] 何顺利,焦春艳,王建国,等.恒速压汞与常规压汞的异同[J].断块油气田,2011,18(2):235-237.
[18] Zhao Huawei,Ning Zhengfu,Wang Qing,et al .Petrophysical characterization of tight oil reservoirs using pressure-controlled porosimetry combined with rate-controlled porosimetry[J].Fuel,2015,154:233-242
[19] 宋磊,宁正福,孙一丹,等.联合压汞法表征致密油储层孔隙结构[J].石油实验地质,2017,39(5):700-705.
[20] Hartmann D J,Beaumont E A.Predicting reservoir system quality and performance[C]//Beaumont E A,Foster N H.Exploring for oil and gas traps,AAPG Treatise of Petroleum Geology,Handbook of Petroleum Geology.Tulsa:AAPG,1999.
[21] 吴浩,张春林,纪友亮,等.致密砂岩孔喉大小表征及对储层物性的控制:以鄂尔多斯盆地陇东地区延长组为例[J].石油学报,2017,38(8):876-887.
[2] 姚泾利,邓秀芹,赵彦德,等.鄂尔多斯盆地延长组致密油特征[J].石油勘探与开发,2013,40(2):150-158.
[3] 孙卫,史成恩,赵惊蛰,等.X-CT扫描成像技术在特低渗透储层微观孔隙结构及渗流机理研究中的应用:以西峰油田庄19井区长82储层为例[J].地质学报,2006,80(5):775-779.
[4] 王振华,陈刚,李书恒,等.核磁共振岩心实验分析在低孔渗储层评价中的应用[J].石油实验地质,2014,36(6):773-779.
[5] 任淑悦,孙卫,刘登科,等.苏里格西区苏48区块盒8段储层微观孔隙结构及对渗流能力的影响[J].地质科技情报,2018,37(2):123-128.
[6] 朱永贤,孙卫,于锋.应用常规压汞和恒速压汞实验方法研究储层微观孔隙结构:以三塘湖油田牛圈湖区头屯河组为例[J].天然气地球科学,2008,19(4):553-556.
[7] 高辉,王美强,尚水龙.应用恒速压汞定量评价特低渗透砂岩的微观孔喉非均质性:以鄂尔多斯盆地西峰油田长8储层为例[J].地球物理学进展,2013,28(4):1900-1907.
[8] 公言杰,柳少波,赵孟军,等.核磁共振与高压压汞实验联合表征致密油储层微观孔喉分布特征[J].石油实验地质,2016,38(3):389-394.
[9] 肖佃师,卢双舫,陆正元,等.联合核磁共振和恒速压汞方法测定致密砂岩孔喉结构[J].石油勘探与开发,2016,43(6):961-970.
[10] 庞振宇,孙卫,李进步,等.低渗透致密气藏微观孔隙结构及渗流特征研究 :以苏里格气田苏48和苏120区块储层为例[J].地质科技情报,2013,32(4):133-138.
[11] 彭攀,宁正福,祁丽莎,等.致密储层孔隙结构研究方法概述[J].油气藏评价与开发,2014,4(1):26-32.
[12] 曹斌风,孙卫.吴旗地区薛岔区块延长组长6砂岩储层成岩作用研究[J].天然气地球科学,2011,22(6):951-960.
[13] 贾承造,邹才能,李建忠,等.中国致密油评价标准、主要类型、基本特征及资源前景[J].石油学报,2012,33(3):343-350.
[14] 黎盼,孙卫,高永利,等.致密砂岩储层差异性成岩演化对孔隙度定量演化表征影响:以鄂尔多斯盆地马岭地区长81储层为例[J].地质科技情报,2018,37(1):135-142.
[15] 郑庆华,柳益群.鄂尔多斯盆地华庆地区延长组长4+5致密油层成岩作用及成岩相[J].地球科学进展,2015,30(1):78-90.
[16] 喻建,马捷,路俊刚,等.压汞—恒速压汞在致密储层微观孔喉结构定量表征中的应用:以鄂尔多斯盆地华池-合水地区长7储层为例[J].石油实验地质,2015,37(6):789-795.
[17] 何顺利,焦春艳,王建国,等.恒速压汞与常规压汞的异同[J].断块油气田,2011,18(2):235-237.
[18] Zhao Huawei,Ning Zhengfu,Wang Qing,et al .Petrophysical characterization of tight oil reservoirs using pressure-controlled porosimetry combined with rate-controlled porosimetry[J].Fuel,2015,154:233-242
[19] 宋磊,宁正福,孙一丹,等.联合压汞法表征致密油储层孔隙结构[J].石油实验地质,2017,39(5):700-705.
[20] Hartmann D J,Beaumont E A.Predicting reservoir system quality and performance[C]//Beaumont E A,Foster N H.Exploring for oil and gas traps,AAPG Treatise of Petroleum Geology,Handbook of Petroleum Geology.Tulsa:AAPG,1999.
[21] 吴浩,张春林,纪友亮,等.致密砂岩孔喉大小表征及对储层物性的控制:以鄂尔多斯盆地陇东地区延长组为例[J].石油学报,2017,38(8):876-887.