碳酸盐岩缝洞型储层有效性评价新方法
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摘要
碳酸盐岩储层孔隙类型多样,孔隙结构复杂,单一的孔隙度难以描述储层的有效性。以四川盆地高石梯磨溪地区龙王庙组缝洞型储层为例,优选出胶结指数m和基质孔隙度占比2个参数建立了储层有效性评价方法,胶结指数m采用新提出的基于裂缝形态的多孔介质模型计算得到,该模型可以计算出随深度变化的胶结指数m值,且精度高。研究发现,产层胶结指数m通常小于2.25,基质孔隙度占比大于44%;差产层胶结指数m通常小于2.25,基质孔隙度占比小于44%,或者,胶结指数m大于2.25,基质孔隙度占比大于44%;干层胶结指数m通常大于2.25且基质孔隙度占比小于44%。应用结果表明,该方法显著提高了研究区储层有效性评价精度。
Due to various pore types and complex pore structures, it is difficult to describe the effectiveness of carbonate reservoirs with a single porosity. Taking the fractured-vuggy reservoir of Longwangmiao Formation in Gaoshiti-Moxi area of Sichuan Basin as an example, two parameters, cementation index m and the ratio of matrix porosity, were selected to establish an evaluation method for evaluating reservoir effectiveness. Cementation index m was calculated by a new porous medium model based on fracture morphology. Using the model, the cementation index is very precise and can vary with depth. It is found that for high-quality reservoirs, the cementation index m is usually less than 2.25 and the ratio of matrix porosity is more than 44%; for poor reservoirs, the cementation index m is usually less than 2.25 and the matrix porosity ratio is less than 44%, or the cementation index m is more than 2.25 and the matrix porosity ratio is more than 44%; for dry layers, the cementation index m is usually more than 2.25 and the matrix porosity ratio is less than 44%. The application results show that the method can significantly improve the accuracy of reservoir evaluation in the study area.
Due to various pore types and complex pore structures, it is difficult to describe the effectiveness of carbonate reservoirs with a single porosity. Taking the fractured-vuggy reservoir of Longwangmiao Formation in Gaoshiti-Moxi area of Sichuan Basin as an example, two parameters, cementation index m and the ratio of matrix porosity, were selected to establish an evaluation method for evaluating reservoir effectiveness. Cementation index m was calculated by a new porous medium model based on fracture morphology. Using the model, the cementation index is very precise and can vary with depth. It is found that for high-quality reservoirs, the cementation index m is usually less than 2.25 and the ratio of matrix porosity is more than 44%; for poor reservoirs, the cementation index m is usually less than 2.25 and the matrix porosity ratio is less than 44%, or the cementation index m is more than 2.25 and the matrix porosity ratio is more than 44%; for dry layers, the cementation index m is usually more than 2.25 and the matrix porosity ratio is less than 44%. The application results show that the method can significantly improve the accuracy of reservoir evaluation in the study area.
引文
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[2] 闫建平,梁强,李尊芝,等.连通域标识法在FMI图像溶洞信息定量拾取中的应用 [J].地球物理学报,2016,59(12):4759-4770.
[3] 王亮,司马立强,谢彬,等.龙岗地区雷口坡组复杂碳酸盐岩储层有效性评价 [J].特种油气藏,2011,18(5):37-40.
[4] 吴丰,戴诗华,赵辉.核磁共振测井在磨溪气田碳酸盐岩储层有效性评价中的应用 [J].测井技术,2009,33(3):249-252.
[5] 李军,张超谟,唐小梅,等.核磁共振资料在碳酸盐岩储层评价中的应用 [J].江汉石油学院学报,2004,26(1):48-50.
[6] 谢彬.四川盆地乐山龙女寺古隆起震旦系下古生界储层测井评价技术研究 [Z].内部材料,2013.
[7] 张兆辉,高楚桥,高永德.孔洞型储层有效性评价新方法 [J].天然气地球科学,2013,4(3):529-533.
[8] 蔡忠,王伟锋,候加根.利用测井资料研究储层孔隙结构 [J].地质论评,1993,39:69-75.
[9] 张帆,闫建平,李尊芝,等.碎屑岩阿尔奇公式岩电参数与地层水电阻率研究进展 [J].测井技术,2017,41(2):127134.
[10] GHAMDI A,CHEN B,BEHMANESH H,et al.An improved triple-porosity model for evaluation of naturally fractured reservoirs [R].SPE 132879,2010.
[11] ROBERTO F A,ROBERTO A.A triple porosity model for petrophysical analysis of naturally fractured reservoirs [J].Petrophysics,2004,45(2):157-166.
[12] ROBERTO A.Effect of fracture dip and fracture tortuosity on petrophysical evaluation of naturally fractured reservoir [J].Journal of Canadian Petroleum Technology,2010,49(9):69-76.
[13] 田瀚,李明,杨敏,等.缝洞型储层孔隙度指数的计算研究:基于改进前后的三孔隙度模型 [J].地球物理学进展,2015,30(4):1779-1784.
[14] 潘保芝,张丽华,单刚义,等.裂缝和空洞型储层空隙模型的理论进展 [J].地球物理学进展,2006,21(4):1232-1237.
[15] 曾文冲,刘学锋.碳酸盐岩非阿尔奇特性的诠释 [J].测井技术,2013,37(4):341-351.
[16] TOWLE G.An analysis of the formation resistivity factor-porosity relationship of some assumed pore geometries [C]//SPWLA 3rd Annual Logging Symposium,1962.
[17] 漆立新,樊政军,李宗杰,等.塔河油田碳酸盐岩储层三孔隙度测井模型的建立及其应用 [J].石油物探,2010,49(5):489-494.
[18] 赵文智,沈安江,胡素云,等.中国碳酸盐岩储集层大型化发育的地质条件与分布特征 [J].石油勘探与开发,2012,39(1):1-12.
[19] 闫建平,司马立强,谭学群,等.伊朗Zagros盆地西南部白垩系Sarvak组碳酸盐岩储层特征 [J].石油与天然气地质,2015,36(3):409-415.
[20] 张建勇,罗文军,周进高,等.四川盆地安岳特大型气田下寒武统龙王庙组优质储层形成的主控因素 [J].天然气地球科学,2015,26(11):2063-2074.
[21] 司马立强.碳酸盐岩缝洞性储层测井综合评价方法及应用研究 [D].成都:西南石油学院,2005.