柴达木盆地英东油田中浅层油藏储层物性影响因素综合分析
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摘要
英东油田是柴达木盆地近几年发现并高效勘探开发的典型长井段多油层断块油藏,针对油藏开发矛盾,利用岩心、扫描电镜、岩石薄片等分析资料,对工区3个含油层段储层物性特征及其控制因素进行了分析,并在此基础上开展了储层分类评价。结果表明:英东油田岩石类型以岩屑质长石砂岩为主,结构成熟度中等,原生粒间孔、溶蚀孔及残余粒间孔是重要储集空间,由上至下粒度逐渐变细,储集及渗流能力逐渐变差;在干旱、半干旱气候条件下,浅水湖平面频繁变化,砂体具有浅水低分异特征,目的层垂向上发育多个相互叠置的间断正韵律,总体上沉积微相、岩矿组分及胶结物含量的不同是影响本区域先天储层物性分布差异的内在条件,而压实作用则是后期储层物性演化的重要影响因素,其对储层孔渗损失作用强于胶结作用,后续油藏综合治理应结合储层分类评价优选水下分流河道、滩坝砂、席状砂等Ⅰ、Ⅱ类有利储层砂体进行措施增产。
Yingdong Oilfield is a typical long interval multiple zone fault block reservoir explored and developed efficiently in recent years in Qaidam Basin. In the light of the contradiction of reservoir development,using the data of core analysis, scanning electronic microscope, thin sections and reservoir properties, this paper analyzes the reservoir physical properties and control factors of three oil-bearing layers in the work area and conducts the reservoir classification evaluation.The results show that the major rock type in Yingdong Oilfield is feldspathic arenite with middle-structural maturity of sandstones, primary intergranular pores, dissolved pores and residual intergranular pores are essential reservoir space, and grain size decreases gradually from top to bottom, the reservoir and seepage capacity gradually become worse. In the arid and semi-arid sedimentary climate conditions, the shallow lake level changes frequently, and sand bodies have the characteristics of shallow water and low differentiation, while the target stratum is developed vertically with multiple overlapping discontinuous positive rhythms. By and large, sedimentary microfacies, original fabric and cement content are internal conditions which control the difference of reservoir physical properties in the region. The main influencing factor of reservoir physical property evolution in later stage is compaction which is stronger than reservoir porosity and permeability loss of cementation. The favorable reservoir sand bodies, such as underwater distributary channel, beach bar sand and mat sand with class Ⅰand Ⅱ,etc, are optimized to increase production for comprehensive reservoir management which should be combined with classification and evaluation of reservoirs.
Yingdong Oilfield is a typical long interval multiple zone fault block reservoir explored and developed efficiently in recent years in Qaidam Basin. In the light of the contradiction of reservoir development,using the data of core analysis, scanning electronic microscope, thin sections and reservoir properties, this paper analyzes the reservoir physical properties and control factors of three oil-bearing layers in the work area and conducts the reservoir classification evaluation.The results show that the major rock type in Yingdong Oilfield is feldspathic arenite with middle-structural maturity of sandstones, primary intergranular pores, dissolved pores and residual intergranular pores are essential reservoir space, and grain size decreases gradually from top to bottom, the reservoir and seepage capacity gradually become worse. In the arid and semi-arid sedimentary climate conditions, the shallow lake level changes frequently, and sand bodies have the characteristics of shallow water and low differentiation, while the target stratum is developed vertically with multiple overlapping discontinuous positive rhythms. By and large, sedimentary microfacies, original fabric and cement content are internal conditions which control the difference of reservoir physical properties in the region. The main influencing factor of reservoir physical property evolution in later stage is compaction which is stronger than reservoir porosity and permeability loss of cementation. The favorable reservoir sand bodies, such as underwater distributary channel, beach bar sand and mat sand with class Ⅰand Ⅱ,etc, are optimized to increase production for comprehensive reservoir management which should be combined with classification and evaluation of reservoirs.
引文
[1] 马达德,魏学斌,夏晓敏.柴达木盆地英东油田的发现及勘探开发关键技术[J].石油学报,2016,37(增刊1):11-21.
[2] 倪金龙,王鹏,杜小亮,等.柴达木盆地西南部新生代构造样式及其动力学特征[J].油气地质与采收率,2009,16(1):9-12.
[3] 王风华,罗群,李玉喜,等.柴达木盆地断裂上下盘油气差异聚集效应与成因[J].油气地质与采收率,2007,14(2):19-22.
[4] 官大勇,胡望水,魏为.柴达木盆地西部褶皱构造类型及其与油气的关系[J].油气地质与采收率,2004,11(5):30-32.
[5] 白金莉,李文厚,姜瑀东,等.鄂尔多斯盆地旬邑地区长61储层物性影响因素[J].地质科技情报,2017,36(2):198-205.
[6] 王伟,朱玉双,牛小兵,等.鄂尔多斯盆地姬塬地区长6储层微观孔隙结构及控制因素[J].地质科技情报,2013,32(3):118-123.
[7] 吴志雄,王波,赵健,等.阿尔金山前东段牛东地区侏罗系成岩作用及其对储层物性的影响[J].岩性油气藏,2016,28(1):58-63.
[8] 刘秀婵,刘林玉,陈西泮.横山双城油区长6油层组主要成岩作用及其对储层物性的影响[J].岩性油气藏,2011,23(2):71-74.
[9] 刘鑫, 张晓磊,赵应权,等.镇北-环县地区长4+5油层储层特征及其控制因素[J].地质科技情报,2015,34(4):149-157.
[10] 孟元林,王维安,高煜婷,等.松辽盆地北部泉三、四段储层物性影响因素分析[J].地质科学,2011,46(4):1025-1041.
[11] 田成,陈翠柏,田崇鲁,等.山东渤南油田三区下第三系沙河街组三段4砂组储渗结构特征研究[J].地质科技情报,2001,20(1):52-55.
[12] 胡作维,李云,黄思静,等.砂岩储层中原生孔隙的破坏与保存机制研究进展[J].地球科学进展,2012,27(1):14-25.
[13] 宋守德.碎屑岩储层物性的主要控制因素[J].内蒙古石油化工,2008,13:61-63.
[14] 张善文.济阳坳陷深层稠油成因机理、储层评价与成藏规律[D].广州:中国科学院广州地球化学研究所,2002.
[15] 伏万军.黏土矿物成因及对砂岩储集性能的影响[J].古地理学报,2000,2(3):59-67.
[16] 郇金来,漆智,杨朝强,等.莺歌海盆地东方区黄流组一段储层成岩作用机理及孔隙演化[J].地质科技情报,2016,35(1):87-93.
[17] Mollema P N,Antonellini M A.Compaction bands:A structural analog for anti-mode I cracks in aeolian sandstone[J].Tectonophysics,1996,267:209-228.
[18] 贝丰,王允诚.沉积物的压实作用和烃类初次运移[C]//佚名.有机地球化学和陆相生油.北京:中国石油学会石油地质委员会,1986:257-264.
[19] 刘国勇,刘阳,张刘平.压实作用对砂岩储层物性的影响[J].西安石油大学学报:自然科学版,2006,21(4):24-28.
[20] 王鹏,赵澄林.柴达木盆地北缘地区第三系成岩作用研究[J].西安石油学院学报:自然科学版,2002,17(4):1-5.
[21] 薛新克,黄治赳,李震华,等.准噶尔盆地乌夏地区侏罗系储集层成岩作用与孔隙演化[J].新疆石油地质,2007,28(4):428-431.
[22] 李先军.碎屑岩成岩作用对储层物性的影响[J].地下水,2015,37(1):219-220.
[2] 倪金龙,王鹏,杜小亮,等.柴达木盆地西南部新生代构造样式及其动力学特征[J].油气地质与采收率,2009,16(1):9-12.
[3] 王风华,罗群,李玉喜,等.柴达木盆地断裂上下盘油气差异聚集效应与成因[J].油气地质与采收率,2007,14(2):19-22.
[4] 官大勇,胡望水,魏为.柴达木盆地西部褶皱构造类型及其与油气的关系[J].油气地质与采收率,2004,11(5):30-32.
[5] 白金莉,李文厚,姜瑀东,等.鄂尔多斯盆地旬邑地区长61储层物性影响因素[J].地质科技情报,2017,36(2):198-205.
[6] 王伟,朱玉双,牛小兵,等.鄂尔多斯盆地姬塬地区长6储层微观孔隙结构及控制因素[J].地质科技情报,2013,32(3):118-123.
[7] 吴志雄,王波,赵健,等.阿尔金山前东段牛东地区侏罗系成岩作用及其对储层物性的影响[J].岩性油气藏,2016,28(1):58-63.
[8] 刘秀婵,刘林玉,陈西泮.横山双城油区长6油层组主要成岩作用及其对储层物性的影响[J].岩性油气藏,2011,23(2):71-74.
[9] 刘鑫, 张晓磊,赵应权,等.镇北-环县地区长4+5油层储层特征及其控制因素[J].地质科技情报,2015,34(4):149-157.
[10] 孟元林,王维安,高煜婷,等.松辽盆地北部泉三、四段储层物性影响因素分析[J].地质科学,2011,46(4):1025-1041.
[11] 田成,陈翠柏,田崇鲁,等.山东渤南油田三区下第三系沙河街组三段4砂组储渗结构特征研究[J].地质科技情报,2001,20(1):52-55.
[12] 胡作维,李云,黄思静,等.砂岩储层中原生孔隙的破坏与保存机制研究进展[J].地球科学进展,2012,27(1):14-25.
[13] 宋守德.碎屑岩储层物性的主要控制因素[J].内蒙古石油化工,2008,13:61-63.
[14] 张善文.济阳坳陷深层稠油成因机理、储层评价与成藏规律[D].广州:中国科学院广州地球化学研究所,2002.
[15] 伏万军.黏土矿物成因及对砂岩储集性能的影响[J].古地理学报,2000,2(3):59-67.
[16] 郇金来,漆智,杨朝强,等.莺歌海盆地东方区黄流组一段储层成岩作用机理及孔隙演化[J].地质科技情报,2016,35(1):87-93.
[17] Mollema P N,Antonellini M A.Compaction bands:A structural analog for anti-mode I cracks in aeolian sandstone[J].Tectonophysics,1996,267:209-228.
[18] 贝丰,王允诚.沉积物的压实作用和烃类初次运移[C]//佚名.有机地球化学和陆相生油.北京:中国石油学会石油地质委员会,1986:257-264.
[19] 刘国勇,刘阳,张刘平.压实作用对砂岩储层物性的影响[J].西安石油大学学报:自然科学版,2006,21(4):24-28.
[20] 王鹏,赵澄林.柴达木盆地北缘地区第三系成岩作用研究[J].西安石油学院学报:自然科学版,2002,17(4):1-5.
[21] 薛新克,黄治赳,李震华,等.准噶尔盆地乌夏地区侏罗系储集层成岩作用与孔隙演化[J].新疆石油地质,2007,28(4):428-431.
[22] 李先军.碎屑岩成岩作用对储层物性的影响[J].地下水,2015,37(1):219-220.
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