低孔低渗储层有效厚度确定方法研究——以安塞油田长2储层为例
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摘要
针对安塞油田长2储层低孔、低渗、物性变化快、纵横向非均质性强的地质特点,综合应用目的层段的岩心分析、试油、生产动态及测井等资料,在储层四性关系研究基础上,采用直方图法和交会图法确立了有效厚度下限标准,采用多种测井曲线半定量、半定性分析结合的方式,建立了不同类型夹层测井定量识别图及夹层扣除标准。研究区长2储层有效厚度含油性下限为油迹级,岩性下限为细砂岩,物性下限为孔隙度11.5%、渗透率0.63×10~(-3)μm~2,电性下限为RILD≥13Ω·m、Δt≥230μs/m;夹层类型主要为泥质夹层和钙质夹层,利用自然伽马、声波时差、井径和微梯度等曲线的定量和自然电位、深感应电阻率、中感应电阻率、微球电阻率及微电位等曲线的定性可以识别和扣除夹层。
The Chang-2 reservoir of Ansai oilfield has the geological characteristics of low porosity, low permeability, fast changeof physical properties and strong vertical and horizontal heterogeneity. Based on the ''four properties' ' relation of reservoir, we estab-lished the minimum standards of effective thickness by using the core analysis, oil test, production dynamics and logging by theway of histogram method and cross plot method. Then we proposed the different types of interlayer logging quantitative identifica-tion chart and the elimination criterion of various interlayer on the basis of the semi-quantification and semi-qualitative analysisby many kinds of logging curves. The minimum values were as follows: the oil-bearing property was to see the grease spots; the lith-ological property was to see the fine-grained sandstone; the physical property were the porosity was more than or equaled to 11.5 % and the permeability was more than or equaled to 0.63×10~(-3)μm~2; the electrical property were the resistivity was more than orequaled to 13 Ω·m and the acoustic was more than or equaled to 230 μs/m. The main types of interlayer were calcareous interlayerand muddy interlayer. We could identify and eliminate the interlayer by the quantification of curves of natural gamma, acoustic andmicroelectrode, and the qualitative analysis of the curves of spontaneous potential, RILD, RILM, microsphere resistivity and micronormal.
The Chang-2 reservoir of Ansai oilfield has the geological characteristics of low porosity, low permeability, fast changeof physical properties and strong vertical and horizontal heterogeneity. Based on the ''four properties' ' relation of reservoir, we estab-lished the minimum standards of effective thickness by using the core analysis, oil test, production dynamics and logging by theway of histogram method and cross plot method. Then we proposed the different types of interlayer logging quantitative identifica-tion chart and the elimination criterion of various interlayer on the basis of the semi-quantification and semi-qualitative analysisby many kinds of logging curves. The minimum values were as follows: the oil-bearing property was to see the grease spots; the lith-ological property was to see the fine-grained sandstone; the physical property were the porosity was more than or equaled to 11.5 % and the permeability was more than or equaled to 0.63×10~(-3)μm~2; the electrical property were the resistivity was more than orequaled to 13 Ω·m and the acoustic was more than or equaled to 230 μs/m. The main types of interlayer were calcareous interlayerand muddy interlayer. We could identify and eliminate the interlayer by the quantification of curves of natural gamma, acoustic andmicroelectrode, and the qualitative analysis of the curves of spontaneous potential, RILD, RILM, microsphere resistivity and micronormal.
引文
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[21]王媛媛,王桂成,徐勇强,等.杏子川油田长6低渗透储层有效厚度下限研究[J].地质科技情报,2013,32(3):113-117.
[22]陈玲.边城油田陈家舍区块戴一段储层下限参数研究[J].油气藏评价与开发,2016,6(4):14-17.
[23]冯林杰.鄂尔多斯盆地H区长4+5、长6储层四性关系及有效厚度下限研究[J].石化技术,2017,24(4):162-163.
[24]魏小薇,谢继容,唐大海,等.低孔渗砂岩储层基质物性下限确定方法研究——以川中LA构造沙一段油藏为例[J].天然气工业,2005,25(增刊A):28-31.
[25]黎著,罗彬,张旭阳,等.致密砂岩气藏储层物性下限及控制因素分析[J].西南石油大学学报(自然科学版),2013,35(2):54-62.
[26]付金华,罗安湘,张妮妮,等.鄂尔多斯盆地长7油层组有效储层物性下限的确定[J].中国石油勘探,2014,19(6):82-88.
[27]柳锦云.低渗透油藏有效厚度下限标准研究[J].海洋石油,2008,28(3):70-73.
[28]严科,赵红兵.三角洲前缘储层中钙质夹层分布及成因探讨[J].西南石油大学学报(自然科学版),2014,36(1):33-38.
[29]Lynds R, Hajek E. Conceptual model for predicting mudstone dimensions in sandy braided river reservoirs[J]. AAPG Bulletin, 2006, 90(8):1273-1288.
[30]赵向原,曾联波,刘忠群,等.致密砂岩储层中钙质夹层特征及与天然裂缝分布的关系[J].地质论评,2015,61(1):163-171.
[2]刘占良,崔明明,樊爱萍,等.致密砂岩气藏储量计算方法探讨——以容积法计算SX区块储量为例[J].天然气地球科学,2014,25(12):1983-1993.
[3]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,1990:18-62.
[4]岳绍飞,刘杰,马丽娜,等.福山凹陷流沙港组三段储层四性关系及有效厚度下限标准[J].石油地质与采收率,2013,20(4):42-45.
[5]杨俊杰.鄂尔多斯盆地构造演化与油气分布规律[M].北京:石油工业出版社,2002.
[6]邓秀芹,蔺昉晓,刘显阳,等.鄂尔多斯盆地三叠系延长组沉积演化及其与早印支运动关系的探讨[J].古地理学报,2008,10(2):159-166.
[7]罗静兰,张晓莉,张云翔,等.成岩作用对河流—三角洲相砂岩储层物性演化的影响——以延长油区上三叠统延长组长2砂岩为例[J].沉积学报,2001,19(4):541-547.
[8]郭艳琴,邱雅洁,李文厚,等.陕西安塞油田长2和长3储层特征及其非均质性[J].地质通报,2013,32(11):1815-1823.
[9]戴亚权,赵俊英,罗静兰,等.安塞油田坪桥地区长2段储层非均质性研究[J].西北大学学报(自然科学版),2010,40(2):287-292.
[10]孙鲁平,首皓,李平,等.非均质储层测井二次解释——以辽河GS油田为例[J].石油天然气学报,2009,31(4):91-95.
[11]闫建平,首祥云,李尊芝.测井二次解释模型在储量套改中的应用[J].石油地质与采收率,2006,13(6):55-58.
[12]国土资源部储量司.矿产资源储量计算方法汇编[M].北京:地质出版社,2000.
[13]王霞,郭爱华,张添锦,等.用含水砂岩作标准层进行测井资料标准化处理的尝试[J].延安大学学报(自然科学版),2017,36(4):17-21.
[14]李克永,李文厚,陈全红,等.安塞油田镰刀湾长2油层优质储层特征分析[J].西北大学学报(自然科学版),2011,41(1):95-99.
[15]朱广社,李相明,别旭伟.安塞油田长2油层储层特征[J].石油天然气学报,2005,27(6):857-858.
[16]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.
[17]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.
[18]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.
[19]宋子齐,程国建,王静,等.特低渗透油层有效厚度确定方法研究[J].石油学报,2006,27(6):103-106.
[20]俞保财,张永强,雷启鸿,等.吴起—铁边城油田长6储层四性关系及有效厚度下限研究[J].油气藏评价与开发,2011,1(6):52-56.
[21]王媛媛,王桂成,徐勇强,等.杏子川油田长6低渗透储层有效厚度下限研究[J].地质科技情报,2013,32(3):113-117.
[22]陈玲.边城油田陈家舍区块戴一段储层下限参数研究[J].油气藏评价与开发,2016,6(4):14-17.
[23]冯林杰.鄂尔多斯盆地H区长4+5、长6储层四性关系及有效厚度下限研究[J].石化技术,2017,24(4):162-163.
[24]魏小薇,谢继容,唐大海,等.低孔渗砂岩储层基质物性下限确定方法研究——以川中LA构造沙一段油藏为例[J].天然气工业,2005,25(增刊A):28-31.
[25]黎著,罗彬,张旭阳,等.致密砂岩气藏储层物性下限及控制因素分析[J].西南石油大学学报(自然科学版),2013,35(2):54-62.
[26]付金华,罗安湘,张妮妮,等.鄂尔多斯盆地长7油层组有效储层物性下限的确定[J].中国石油勘探,2014,19(6):82-88.
[27]柳锦云.低渗透油藏有效厚度下限标准研究[J].海洋石油,2008,28(3):70-73.
[28]严科,赵红兵.三角洲前缘储层中钙质夹层分布及成因探讨[J].西南石油大学学报(自然科学版),2014,36(1):33-38.
[29]Lynds R, Hajek E. Conceptual model for predicting mudstone dimensions in sandy braided river reservoirs[J]. AAPG Bulletin, 2006, 90(8):1273-1288.
[30]赵向原,曾联波,刘忠群,等.致密砂岩储层中钙质夹层特征及与天然裂缝分布的关系[J].地质论评,2015,61(1):163-171.