渤海中部古近系沙河街组有利砾岩类储层特征
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摘要
渤海湾盆地是我国重要的含油气盆地,其中古近系沙河街组发育储集性较好的砾岩储层。通过对储层岩石薄片显微鉴定、物性分析、扫描电镜分析、阴极发光分析等,明确了沙河街组有利的砾岩储层的岩石学、储集性和成岩作用特征。砾岩类型多样,其中云质砾岩的储集性最好。砾岩储层物性较好,平均孔隙度为16.1%,平均渗透率为217.93m D。主要孔隙类型为原生孔,原生孔类型主要为砾石间残余原生孔和生物碎屑体腔孔,其次是溶蚀孔。砾岩储层成岩作用类型与砾岩填隙物成分关系密切,以砂岩为主要填隙物的成岩作用中有显著的长石溶蚀作用,以碳酸盐岩为主要填隙物的则具有多期白云石和方解石等胶结物,最有利的成岩作用是早期白云石衬垫和长石的溶蚀作用。
The Bohai Bay Basin is an important petroliferous basin in eastern China,where the conglomerate reservoirs with good reservoir quality are well developed in the Palaeogene Shahejie Formation in central Bohai Bay Basin. In the light of microscopic examination,physical property,scanning electron microscopy( SEM) analysis and cathodoluminescence images,the present paper focuses on lithology,reservoir capacity and diagenesis of the favourable conglomerate reservoirs in the Palaeogene Shahejie Formation. In a variety of conglomerates,the dolomitic conglomerates have the best reservoir quality,with an average porosity of 16. 1% and an average permeability of 217. 93 m D. The porosity types are composed dominantly of the primary pores and secondly of the dissolved pores. The primary pores contain intergranular residual primary pores and visceral foramen in bioclastics.The diagenetic types of the conglomerate reservoirs generally depend on the interstitial compositions in the conglomerates. The dissolution of feldspar may be apparently visible in the diagenesis of the sandstone-filled conglomerates,whereas the multiphase dolomite and calcite cements tend to occur in the diagenesis of the carbonate-filled conglomerates. The favourable diagenesis is represented by the early dolomite padding and feldspar dissolution.
The Bohai Bay Basin is an important petroliferous basin in eastern China,where the conglomerate reservoirs with good reservoir quality are well developed in the Palaeogene Shahejie Formation in central Bohai Bay Basin. In the light of microscopic examination,physical property,scanning electron microscopy( SEM) analysis and cathodoluminescence images,the present paper focuses on lithology,reservoir capacity and diagenesis of the favourable conglomerate reservoirs in the Palaeogene Shahejie Formation. In a variety of conglomerates,the dolomitic conglomerates have the best reservoir quality,with an average porosity of 16. 1% and an average permeability of 217. 93 m D. The porosity types are composed dominantly of the primary pores and secondly of the dissolved pores. The primary pores contain intergranular residual primary pores and visceral foramen in bioclastics.The diagenetic types of the conglomerate reservoirs generally depend on the interstitial compositions in the conglomerates. The dissolution of feldspar may be apparently visible in the diagenesis of the sandstone-filled conglomerates,whereas the multiphase dolomite and calcite cements tend to occur in the diagenesis of the carbonate-filled conglomerates. The favourable diagenesis is represented by the early dolomite padding and feldspar dissolution.
引文
[1]龚育龄,王良书,刘绍文,等.渤海湾盆地新生界生油岩系底界面温度分布[J].地质科学,2008,43(1):1-11.
[2]徐守余,严科.渤海湾盆地构造体系与油气分布[J].地质力学学报,2005,11(3):259-265.
[3]徐长贵,周心怀,杨波,王昕.渤中凹陷石南陡坡带构造-岩性复合圈闭的形成及分布规律[J].现代地质,2009,23(5):887-893.
[4]倪军娥,孙立春,古莉,等.渤海海域石臼坨凸起Q油田沙二段储层沉积模式[J].石油与天然气地质,2013,34(4):491-498.
[5]吴磊,徐怀民,季汉成.渤海湾盆地渤中凹陷古近系沉积体系演化及物源分析[J].海洋地质与第四纪地质,2006,26(1):81-88.
[6]王瑞飞,何润华,苏道敏,等.深层砂岩油藏储层孔喉特征参数及预测模型[J].地球物理学进展,2016,31(5):2160-2165.
[7]操应长,金杰华,王艳忠,等.东营凹陷北带古近系沙四段砂砾岩体沉积特征及沉积模式[J].沉积与特提斯地质,2014,34(4):13-23.
[8]谈彩萍,江兴歌,陈拥锋,等.石油运移成藏有利区预测方法研究——以渤海湾盆地东营凹陷为例[J].石油实验地质,2008,30(6):629-635.
[9]董月霞,杨赏,陈蕾,等.渤海湾盆地辫状河三角洲沉积与深部储集层特征——以南堡凹陷南部古近系沙一段为例[J].石油勘探与开发,2014,41(4):385-392.
[10]谢武仁,邓宏文,王洪亮,等.渤中凹陷古近系储层特征及其控制因素[J].沉积与特提斯地质,2008,28(3):101-107.
[11]吴富强,鲜学福.深部储层勘探、研究现状及对策[J].沉积与特提斯地质,2006,26(2):68-71.
[12]曲长伟,林春明,蔡明俊,等.渤海湾盆地北塘凹陷古近系沙河街组三段白云岩储层特征[J].地质学报,2014,88(8):1588-1602.
[13]祝厚勤,庞雄奇,林世国,等.东营凹陷岩性油藏主控因素及成藏模式[J].沉积与特提斯地质,2006,26(1):74-80.
[14]曹鉴华,王四成,赖生华,等.渤海湾盆地束鹿凹陷中南部沙三下亚段致密泥灰岩储层分布预测[J].石油与天然气地质,2014,35(4):480-485.
[15]王昕,周心怀,魏刚,等.勘探阶段成藏动力学研究方法初探[J].断块油气田,2010,17(2):177-180.
[16]田克勤.渤海湾盆地下第三系深层油气地质与勘探[M].北京:石油工业出版社,2006.
[17]SY/T 6285-2011.油气储层评价方法[S].北京:国家能源局,2011.
[2]徐守余,严科.渤海湾盆地构造体系与油气分布[J].地质力学学报,2005,11(3):259-265.
[3]徐长贵,周心怀,杨波,王昕.渤中凹陷石南陡坡带构造-岩性复合圈闭的形成及分布规律[J].现代地质,2009,23(5):887-893.
[4]倪军娥,孙立春,古莉,等.渤海海域石臼坨凸起Q油田沙二段储层沉积模式[J].石油与天然气地质,2013,34(4):491-498.
[5]吴磊,徐怀民,季汉成.渤海湾盆地渤中凹陷古近系沉积体系演化及物源分析[J].海洋地质与第四纪地质,2006,26(1):81-88.
[6]王瑞飞,何润华,苏道敏,等.深层砂岩油藏储层孔喉特征参数及预测模型[J].地球物理学进展,2016,31(5):2160-2165.
[7]操应长,金杰华,王艳忠,等.东营凹陷北带古近系沙四段砂砾岩体沉积特征及沉积模式[J].沉积与特提斯地质,2014,34(4):13-23.
[8]谈彩萍,江兴歌,陈拥锋,等.石油运移成藏有利区预测方法研究——以渤海湾盆地东营凹陷为例[J].石油实验地质,2008,30(6):629-635.
[9]董月霞,杨赏,陈蕾,等.渤海湾盆地辫状河三角洲沉积与深部储集层特征——以南堡凹陷南部古近系沙一段为例[J].石油勘探与开发,2014,41(4):385-392.
[10]谢武仁,邓宏文,王洪亮,等.渤中凹陷古近系储层特征及其控制因素[J].沉积与特提斯地质,2008,28(3):101-107.
[11]吴富强,鲜学福.深部储层勘探、研究现状及对策[J].沉积与特提斯地质,2006,26(2):68-71.
[12]曲长伟,林春明,蔡明俊,等.渤海湾盆地北塘凹陷古近系沙河街组三段白云岩储层特征[J].地质学报,2014,88(8):1588-1602.
[13]祝厚勤,庞雄奇,林世国,等.东营凹陷岩性油藏主控因素及成藏模式[J].沉积与特提斯地质,2006,26(1):74-80.
[14]曹鉴华,王四成,赖生华,等.渤海湾盆地束鹿凹陷中南部沙三下亚段致密泥灰岩储层分布预测[J].石油与天然气地质,2014,35(4):480-485.
[15]王昕,周心怀,魏刚,等.勘探阶段成藏动力学研究方法初探[J].断块油气田,2010,17(2):177-180.
[16]田克勤.渤海湾盆地下第三系深层油气地质与勘探[M].北京:石油工业出版社,2006.
[17]SY/T 6285-2011.油气储层评价方法[S].北京:国家能源局,2011.