江汉盆地新沟嘴组页岩油储层物性下限
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摘要
江汉盆地新沟嘴组泥质白云岩层系钻获页岩油,开辟了该地区油气勘探的新领域。弄清区内页岩油富集与分布规律,对有效储层物性下限的研究具有重要意义。根据研究区岩心实测孔隙度、渗透率和高压压汞资料,综合应用经验统计法、压汞曲线法和最小流动孔喉半径法,确定了江汉盆地南部新沟嘴组不同深度段(778~890,959~1 070,1 378~1 478,2 093~2 200 m)的页岩油储层物性下限,并建立了物性下限值与深度的相关性方程。结果表明:不同研究方法确定的物性下限值不同。总体上,压汞曲线法和最小流动孔喉半径法确定的物性下限值较高,经验统计方法确定的物性下限值较低。随着储层埋深的增加,不同方法确定的物性下限之间的差异减小。多种方法综合运用能够降低物性下限的不确定性。研究区页岩油储层物性下限值随着深度的增加逐渐降低,其中孔隙度下限值随着深度的增加呈指数函数递减,渗透率下限值随着深度的增加呈幂函数递减。
Shale oil resources found in the argillaceous dolomite in the Xingouzui Formation of the Jianghan Basin has opened up a new domain for petroleum exploration. The study on the lower limit of prosity and permeability of effective reservoirs is significant to reveal accumulation and distribution of shale oil in the Basin. According to the porosities,permeabilities and mercury intrusion capillary porosimetry of cores,the lower limits of prosity and permeability of shale oil reservoirs in different depths( 778 ~ 890、959 ~ 1 070、1 378 ~ 1 478、2 093 ~ 2200 m) in the Xingouzui Formation in the southern part of the Basin were determined using the empirical statistics,mercury curve and minimal pore throat radius methods. Moreover,the relationships between the lower limits and depths were established. The preliminary findings of this study include the followings:( 1) the lower limits determined by the different methods are various;( 2) the lower limits determined by the mercury curve and minimal pore throat radius are greater,while that determined by the empirical statistic method are smaller;( 3) the errors of lower limits obtained from the different methods decrease with increasing depths,so that a variety of methods should be used to reduce the uncertainty of the lower limits. The lower limits of shale oil reservoirs in the study area reduce with the increase of depths. The lower limits of porosity( permeability) decrease with increasing depth in an exponent( power exponent) manner.
Shale oil resources found in the argillaceous dolomite in the Xingouzui Formation of the Jianghan Basin has opened up a new domain for petroleum exploration. The study on the lower limit of prosity and permeability of effective reservoirs is significant to reveal accumulation and distribution of shale oil in the Basin. According to the porosities,permeabilities and mercury intrusion capillary porosimetry of cores,the lower limits of prosity and permeability of shale oil reservoirs in different depths( 778 ~ 890、959 ~ 1 070、1 378 ~ 1 478、2 093 ~ 2200 m) in the Xingouzui Formation in the southern part of the Basin were determined using the empirical statistics,mercury curve and minimal pore throat radius methods. Moreover,the relationships between the lower limits and depths were established. The preliminary findings of this study include the followings:( 1) the lower limits determined by the different methods are various;( 2) the lower limits determined by the mercury curve and minimal pore throat radius are greater,while that determined by the empirical statistic method are smaller;( 3) the errors of lower limits obtained from the different methods decrease with increasing depths,so that a variety of methods should be used to reduce the uncertainty of the lower limits. The lower limits of shale oil reservoirs in the study area reduce with the increase of depths. The lower limits of porosity( permeability) decrease with increasing depth in an exponent( power exponent) manner.
引文
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[18]张凤生.压汞资料在储层物性下限确定中的应用[J].中国化工贸易,2013,5(8):21-21.Zhang Fengsheng.Application of mercury data in determination lower boind of physical property[J].China Chemical Trade,2013,5(8):21-21.
[19]任晓霞,李爱芳,王永政,等.致密砂岩储层空隙结构及其对渗流的影响——以鄂尔多斯盆地马岭油田长8储层为例[J].石油与天然气地质,2015,36(5):774-779.Ren Xiaoxia,Li Aifen,Wang Yongzheng,et al.Pore structure of tight sand reservoir and its influence on percolation—Taking Chang 8reservoir in Maling oilfield in Ordos Basin as an example[J].Oil&Gas Geology,2015,36(5):774779.
[20]曾伟,强平.川东嘉二段孔隙层下限及分类与评价[J].矿物岩石,1997,17(2):42-48.Zeng Wei,Qiang Ping.Reservoir’s low limit,classification and evalution of memberⅡof Jialingjiang formation(lower trassic)in eastern Sichuan[J].Journal of Mineralogy and Petrology,1997,17(2):42-48.
[21]高阳,蒋裕强,杨长城,等.最小流动孔喉半径法确定低渗储层物性下限[J].科技导报,2011,29(11-04):34-38.Gao Yang,Jiang Yuqiang,Yang Changcheng,et al.Minimum flow Pore throat radius for determination of the lower limits of parameters in low permeability reservoir[J].Technology Review,2011,29(11-04):34-38.
[22]廖敬,彭彩珍,吕文均,等.毛管压力曲线平均化及J函数处理[J].特种油气藏,2009,15(6):73-75.Liao Jing,Peng Caizhen,Lv Wenjun,et al.Averaging capillary pressure curve and J function processing[J].Special Oli and Gas Reservoir,2009,15(6):73-75.
[23]刘洁,包世界,包婷,等.利用沃尔公式确定原始含油饱和度的方法[J].长江大学学报:自然科学版,2011,8(5):52-54.Liu Jie,Bao Shijie,Bao Ting,et al.Determine the initial oil saturation by Wall method[J].Journal of Yangtze University(Nat Sci Edit),2011,8(5):52-54.
[2]操应长,王艳忠,徐涛玉,等.东营凹陷西部沙四上亚段滩坝砂体有效储层的物性下限及控制因素[J].沉积学报,2009,27(2):230-237.Cao Yingchang,Wang Yanzhong,Xu Taoyu,et al.The petrophysical parameter cutoff and controlling factores of effective reservoir of beach and bar sandbodies of the upper part of Fourth Menber of the Shahejie Formation in West part of Dongying depression[J].Acta sedmentologica sinica,2009,27(2):230-237.
[3]童凯军,程奇,聂玲玲,等.变质岩潜山储集层有效性评价[J].石油与天然气地质,2015,36(05):780-787.Tong Kai jun,Cheng Qi,Nie Lingling,et al.Evaluation of effectiveness of metamorphosed basement buried hill reservoirs[J].Oil&Gas Geology,2015,36(04):780-787.
[4]秦伟军,李娜,付兆辉.高邮凹陷深层系有效储层形成控制因素[J].石油与天然气地质,2015,36(5):788-792.Qin Weijun,Li Na,Fu Zhaohui.Factors controlling formation of effectiven reservoirs in deep of the Gao you Sag[J].Oil&Gas Geology,2015,36(5):788-792.
[5]杨通佑,范尚炯,陈元千,等.石油及天然气储量计算方法[M].北京:石油工业出版社,1990:31-32.Yang Tongyou,Fan Shangjiong,Chen Yuanqian,et al.Petroleum and natural gas reserves calculation method[M].Beijing:Oil Industry Press,1990:31-32.
[6]郭睿.储集层物性下限值确定方法及其补充[J].石油勘探与开发,2004,31(5):140-144.GuoRui.Supplement to determining method of cut-off value of net pay[J].Petroleum Exploration and Development,2004,31(5):140-144.
[7]王健,操应长,高永进,等.东营凹陷古近系红层砂体有效储层的物性下限及控制因素[J].中国石油大学学报:自然科学版,2011,35(4):27-33.Wang Jian,Cao Yingchang,Guo Yongjin,et al.Petrophysical parameter cutoff and controlling factors of effective reservoir of red beds sandbodies of Paleogene in Dongying depression[J].Journal of China University of Petroleum,2011,35(4):27-33.
[8]王必金.江汉盆地构造演化与勘探方向[D].北京:中国地质大学(北京),2006.Wang Binjin.The structure envolution and favorable exploration areas in Jiang Han Basin[D].Beijing:China University of Geosciences(Beijing),2006.
[9]胡涛,陈素.江汉盆地东部新下段层序地层格架与油气成藏[J].新疆石油地质,2005,26(2):158-161.Hu Tao,Chen Shu.Relationship between the sequence stratigraphy framework and petroleum accumulation in Lower Member of Xingouzui Formation,Eastern Jianghan Basin[J].Xinjiang PetroleumGeology,2005,26(2):158-161.
[10]戴世昭.中国石油地质志(卷9)[M].北京:石油工业出版社,1991:161-163.Dai Shizhao.Petroleum geology of China(Volume 9)[M].Beijing:Petroleum Industry Press,1991:161-163.
[11]许泓,陈立欣.新沟油田新沟嘴组下段Ⅱ油组非常规油气藏研究[J].长江大学学报:自然科学版,2013(3):22-24.Xu Hong,Chen Lixin.A study on unconventional oil reservoir ofⅡoil group in lower men-ber of Xingouzui Formation of Xingou oil field[J].Journal of Yangtze University(Nat Sci Edit),2013(3):22-24.
[12]耿龙祥,曹玉珊,易志伟,等.濮城油田砂岩储集层物性下限标准研究[J].石油勘探与开发,1999,26(1):81-83.Geng Longxiang,Cao Yushan,Yi Zhiwei,et al.A study on petrophysical property cutoffs of sandstone reservoirs in Pucheng oil field[J].Petroluem Exploration and Elopement,1999,26(1):81-83.
[13]焦翠华,夏冬冬,王军,等.特低渗砂岩储层物性下限确定方法——以永进油田西山窑组储集层为例[J].石油与天然气地质,2009,30(3):379-383.Jiao Cuihua,Xia Dongdong,Wang Jun,et al.Methods for determining the petrophysical property cutoffs of extra-low porosity and permeability sandstone reservoirs—an example from the Xishanyao Formation reservoirs in Yongjin oilfield[J].Oil&Gas Geology,2009,30(3):379-383.
[14]李烨,司马立强,闫建平,等.低孔、低渗致密砂岩储层物性下限值的确定——以川中P地区须二段气藏为例[J].天然气工业,2014,34(4):52-56.Li Ye,Sima Liqing,Yan Jianping,et al.Determination of petrophysical property cutoffs of tight sandstone gas reservoirs:A case study of T3X2 gas reservoirs in P area of central Si-chuan Basin[J].Nature Gas Industry,2014,34(4):52-56.
[15]冯明刚,严丽,王雪玲,等.元坝气田长兴组气藏有效储层物性下限标准研究[J].石油实验地质,2012,34(5):535-538.Feng Minggang,Yan Li,Wang Xueling,et al.Lower limit for physical property of effective reservoir in Changxing Formation,Yuanba Gas Field[J].Petroluem Geology and Experiment,2012,34(5):535-538.
[16]张凤奇,武富礼,蒙小灵,等.不同类型低渗透储层有效厚度物性下限及其差异性成因——以陕北斜坡中部S地区中生界为例[J].石油与天然气地质,2015,36(4):555-562.Zhang Fengqi,Wu Fuli,Meng Xiaoling,et al.Porosity and permeability cutoffs for calculating effective thickness of different types of lowpermeability reservoirs and causes of their differences:a case study of the Mesozoic in S region of central Shaanbei slope[J].Oil&Gas Geology,2015,36(4):555-562.
[17]董雪梅,胡婷婷,霍进杰,等.统计法在确定卡拉麦里气田物性下限中的应用[J].新疆地质,2011,29(2):242-245.Dong Xuemei,Hu Tingting,Huo Jinjie,et al.Application of statistics method in determination lower boind of property in Kelamaeili Gas Field[J].Xin Jiang Geology,2011,29(2):242-245.
[18]张凤生.压汞资料在储层物性下限确定中的应用[J].中国化工贸易,2013,5(8):21-21.Zhang Fengsheng.Application of mercury data in determination lower boind of physical property[J].China Chemical Trade,2013,5(8):21-21.
[19]任晓霞,李爱芳,王永政,等.致密砂岩储层空隙结构及其对渗流的影响——以鄂尔多斯盆地马岭油田长8储层为例[J].石油与天然气地质,2015,36(5):774-779.Ren Xiaoxia,Li Aifen,Wang Yongzheng,et al.Pore structure of tight sand reservoir and its influence on percolation—Taking Chang 8reservoir in Maling oilfield in Ordos Basin as an example[J].Oil&Gas Geology,2015,36(5):774779.
[20]曾伟,强平.川东嘉二段孔隙层下限及分类与评价[J].矿物岩石,1997,17(2):42-48.Zeng Wei,Qiang Ping.Reservoir’s low limit,classification and evalution of memberⅡof Jialingjiang formation(lower trassic)in eastern Sichuan[J].Journal of Mineralogy and Petrology,1997,17(2):42-48.
[21]高阳,蒋裕强,杨长城,等.最小流动孔喉半径法确定低渗储层物性下限[J].科技导报,2011,29(11-04):34-38.Gao Yang,Jiang Yuqiang,Yang Changcheng,et al.Minimum flow Pore throat radius for determination of the lower limits of parameters in low permeability reservoir[J].Technology Review,2011,29(11-04):34-38.
[22]廖敬,彭彩珍,吕文均,等.毛管压力曲线平均化及J函数处理[J].特种油气藏,2009,15(6):73-75.Liao Jing,Peng Caizhen,Lv Wenjun,et al.Averaging capillary pressure curve and J function processing[J].Special Oli and Gas Reservoir,2009,15(6):73-75.
[23]刘洁,包世界,包婷,等.利用沃尔公式确定原始含油饱和度的方法[J].长江大学学报:自然科学版,2011,8(5):52-54.Liu Jie,Bao Shijie,Bao Ting,et al.Determine the initial oil saturation by Wall method[J].Journal of Yangtze University(Nat Sci Edit),2011,8(5):52-54.