砂体组合的划分及评价——以鄂尔多斯盆地山2段、盒8段为例
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摘要
当砂岩为单层砂体或多层砂体以不同的方式叠置时,其储层物性及含气性有较大差别。基于砂岩储层精细评价的需要,文章对鄂尔多斯盆地山2段、盒8段进行砂体组合类型的划分与评价。以测井资料及岩心描述为基础,将砂体组合划分为两大类、16种不同的类型。建立了砂体组合的测井、地震响应模式,并对各种砂体组合类型的物性及含气性进行了评价。研究表明,厚度较大的单砂体物性及含气性一般优于复合砂体,分流河道、水下分流河道、河口坝单砂体及其复合砂体的物性及含气性较好。苏里格地区盒8下段发育辫状河—辫状河三角洲沉积体系,心滩砂体物性中等—较差,向下到三角洲平原、前缘相带物性变好,且以三角洲平原分流河道单砂体、分流河道叠置砂体物性最好。榆林地区山2段以水下分流河道、河口坝单砂体及其复合砂体物性最好,分流河道单砂体及其叠置砂体物性较好。横穿沉积体系,由河道中心至河道侧翼物性变差。
Reservoir properties and gas-bearing properties vary significantly while sandstone is single-layer sand body or multilayer sand bodies assembled in different ways.Based on the fine evaluation of sandstone reservoir,sand body assemblages of Shan 2 and He 8 member in Ordos Basin are classified and evaluated.By analyzing well logging and core description,sand bodies can be divided into two categories and 16 different types of sand body assemblages.For different sand body assemblages,well logging and seismic response models are set up,and the reservoir characteristics and gas-bearing properties are evaluated.The results show that thicker single sand body has better gas-bearing property than composite sand bodies,and that single sand body or composite sand bodies of distributary channel,underwater distributary channel and mouth bar have high porosity and gas-bearing property.Sedimentary system of braided river and braided delta is identified in He 8 member in Sulige area.The physical property of channel bar sand body is moderate-poor,and gets better downward to the delta plain and delta front.The single sand body of distributary channel in delta plain and superimposed sand bodies of distributary channel have the best properties.In Shan 2 member of Yulin area,single sand body and composite sand bodies of underwater distributary channel and mouth bar have the best physical properties.Single sand body of distributary channel and overlapping sand body have better properties.Through the sedimentary system,physical property becomes poor from channel center to channel flank.
Reservoir properties and gas-bearing properties vary significantly while sandstone is single-layer sand body or multilayer sand bodies assembled in different ways.Based on the fine evaluation of sandstone reservoir,sand body assemblages of Shan 2 and He 8 member in Ordos Basin are classified and evaluated.By analyzing well logging and core description,sand bodies can be divided into two categories and 16 different types of sand body assemblages.For different sand body assemblages,well logging and seismic response models are set up,and the reservoir characteristics and gas-bearing properties are evaluated.The results show that thicker single sand body has better gas-bearing property than composite sand bodies,and that single sand body or composite sand bodies of distributary channel,underwater distributary channel and mouth bar have high porosity and gas-bearing property.Sedimentary system of braided river and braided delta is identified in He 8 member in Sulige area.The physical property of channel bar sand body is moderate-poor,and gets better downward to the delta plain and delta front.The single sand body of distributary channel in delta plain and superimposed sand bodies of distributary channel have the best properties.In Shan 2 member of Yulin area,single sand body and composite sand bodies of underwater distributary channel and mouth bar have the best physical properties.Single sand body of distributary channel and overlapping sand body have better properties.Through the sedimentary system,physical property becomes poor from channel center to channel flank.
引文
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[18]李建中,赵文智,胡素云,等.岩性地层油气藏聚集区带的基本特征[J].石油学报,2007,28(1):14-19.
[19]付金华,魏新善,石晓英.鄂尔多斯盆地榆林气田天然气成藏特征[J].天然气工业,2005,25(4):9-12.
[20]何自新,付金华,席胜利,等.苏里格大气田成藏地质特征[J].石油学报,2003,24(2):6-12.
[21]王华,郑荣才,周祺,等.鄂尔多斯盆地长北气田山2段三角洲沉积体系和砂体展布特征[J].岩性油气藏,2008,20(2):22-28.
[2]付金华,魏新善,黄道军.鄂尔多斯大型含煤盆地岩性气藏成藏规律与勘探技术[J].石油天然气学报,2005,27(1):137-141.
[3]杨华,张文正,李剑锋,等.鄂尔多斯盆地北部上古生界天然气的地球化学研究[J].沉积学报,2004,22(增刊):39-44.
[4]汪泽成,陈孟晋,王震,等.鄂尔多斯盆地上古生界克拉通坳陷盆地煤成气成藏机制[J].石油学报,2006,27(1):8-12.
[5]郭英海,刘焕杰,权彪,等.鄂尔多斯地区晚古生代沉积体系及古地理演化[J].沉积学报,1998,16(3):44-51.
[6]魏红红,彭惠群,李静群,等.鄂尔多斯盆地中部石炭—二叠系沉积相带与砂体展布[J].沉积学报,1999,17(3):403-407.
[7]杨仁超,韩作振,李文厚,等.鄂尔多斯地区二叠系三角洲沉积特征及其模式[J].西北大学学报,2004,33(4):340-344.
[8]付金华,王怀厂,魏新善,等.榆林大型气田石英砂岩储集层特征及成因[J].石油勘探与开发,2005,32(1):30-32.
[9]李文厚,魏红红,马振芳,等.苏里格庙气田碎屑岩储集层特征与天然气富集规律[J].石油与天然气地质,2002,23(4):387-391.
[10]侯中健,陈洪德,田景春,等.苏里格气田盒8段高分辨率层序结构特征[J].成都理工大学学报(自然科学版),2004,31(1):46-52.
[11]李宏伟,范军侠,袁士义,等.苏里格气田下石盒子组层序地层学与天然气高产富集区分布规律[J].石油勘探与开发,2006,33(3):30-34.
[12]文国华,郑荣才,高红灿,等.苏里格气田苏6井区下石盒子组盒8段沉积相特征[J].沉积学报,2007,25(1):90-97.
[13]贾爱林,唐俊伟,何东博,等.苏里格气田强非均质性致密储层的地质建模[J].中国石油勘探,2007,25(1):12-17.
[14]杨晓萍,赵文智,邹才能,等.川中气田与苏里格气田“甜点”储层对比研究[J].天然气工业,2007,27(1):4-7.
[15]杨华,付金华,魏新善.鄂尔多斯盆地成藏特征[J].天然气工业,2005,25(4):5-8.
[16]付金华,段晓文,席胜利.鄂尔多斯盆地上古生界气藏特征[J].天然气工业,2000,20(6):16-20.
[17]戴金星,邹才能,陶士振,等.中国大气田形成条件和主控因素[J].天然气地球科学,2007,18(4):473-484.
[18]李建中,赵文智,胡素云,等.岩性地层油气藏聚集区带的基本特征[J].石油学报,2007,28(1):14-19.
[19]付金华,魏新善,石晓英.鄂尔多斯盆地榆林气田天然气成藏特征[J].天然气工业,2005,25(4):9-12.
[20]何自新,付金华,席胜利,等.苏里格大气田成藏地质特征[J].石油学报,2003,24(2):6-12.
[21]王华,郑荣才,周祺,等.鄂尔多斯盆地长北气田山2段三角洲沉积体系和砂体展布特征[J].岩性油气藏,2008,20(2):22-28.
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