Difference of micro-pore throat characteristics in extra-low permeability sandstone of different pore throat matching relationship
-
摘要: 因沉积和成岩作用改造不同,渗透率相近或相等的砂岩,微观孔喉特征参数存在明显差异。以吴起地区延长组长6砂岩和牛圈湖地区西山窑组X2砂岩为对象,综合利用物性、铸体薄片和恒速压汞对不同孔喉匹配关系下的微观孔喉特征参数进行了定量对比。结果表明,各渗透率级别样品的孔隙参数差异不大,微观孔喉特征的差异主要体现在喉道上。发育的溶蚀孔和晶间孔造成X2砂岩的弯片状、管束状喉道含量高,喉道半径小且分布范围窄,对渗透率贡献集中,平均喉道半径和主流喉道半径小、大孔喉比含量高。长6砂岩缩颈状、片状和弯片状喉道发育,喉道半径差异大、大喉道含量高的特征归因于发育的原生粒间孔。不同孔喉匹配关系下的特低渗透砂岩,开发过程中应区别对待。Abstract: There are different pore throat matching relationship and micro-pore throat characteristics for similar or equal sandstones because of different deposition and diagenesis reconstruction. Taking the Chang6 sandstone of Yanchang Formation in Wuqi area and the X2 sandstone of Xishanyao Formation in Niujuanhu area as the objects, the micro-pore throat characteristics in different pore throat matching relationships are evaluated quantitatively using physical property testing, cast section and constant rate mercury penetration technique. The results show that there are no obvious differences in pore parameters, and the differences of micro-pore throat characteristics are mainly presented in throat parameters for samples with different permeabilities. As to the X2 sandstone, the generation of dissolution pores and intercrystal pores leads to high content of curved lamellar and tube bundle throat, small throat radius and narrow distribution, concentrated contribution of throat to permeability, fine average throat radius and main flow throat radius, high content of big pore throat ratio in Niujuanhu area. In the Chang6 sandstone, necking, flaky and curved lamellar throats develop, throat radius vary obviously, and big throats are in high content, which can be explained by the generation of primary intercrystal pores. Different steps should be taken in the development process for extra-low permeability sandstone reservoirs which present different pore throat matching relationships.
-
[1] 王玉普,计秉玉,郭万奎.大庆外围特低渗透特低丰度油田开发技术研究[J].石油学报,2006,27(6):70-74. [2] 赵靖舟,白玉彬,曹青,等.鄂尔多斯盆地准连续型低渗透—致密砂岩大油田成藏模式[J].石油与天然气地质,2012,33(6):811-827. [3] 李荣西,段立志,张少妮,等.鄂尔多斯盆地低渗透油气藏形成研究现状与展望[J].地球科学与环境学报,2011,33(4):364-372. [4] 侯瑞云,刘忠群.鄂尔多斯盆地大牛地气田致密低渗储层评价与开发对策[J].石油与天然气地质,2012,33(1):118-128. [5] 王道富.鄂尔多斯盆地特低渗透油田开发[M].北京:石油工业出版社,2008. [6] Hood S D,Nelson C S,Kamp P J J.Modification of fracture porosity by multiphase vein mineralization in an Oligocene nontropical carbonate reservoir,Taranaki Basin New Zealand[J].AAPG Bulletin,2003,87(10):1575-1597. [7] Akin S,Castanier L.Multiphase-flow properties of fractured porous media Edgar Rangel-German Serhat Akin,Louis Castanier[J].Journal of Petroleum Science and Engineering,2006,51(3):197-213. [8] 赵惊蛰,李书恒,屈雪峰,等.特低渗透油藏开发压裂技术[J].石油勘探与开发,2002,29(5):93-95. [9] 陈志海.特低渗油藏储层微观孔喉分布特征与可动油评价:以十屋油田营城组油藏为例[J].石油实验地质,2011,33(6):657-670. [10] 胡作维,黄思静,马永坤,等.鄂尔多斯盆地姬塬地区长2油层组储层孔隙结构特征[J].断块油气田,2012,19(05):588-591. [11] 杨希濮,孙卫.鄂尔多斯盆地低渗透油藏孔隙结构特征及影响因素分析[J].特种油气藏,2011,18(6):44-47. [12] 赵振宇.车西洼陷沙四上亚段特低渗储层物性主控因素分析[J].断块油气田,2011,18(4):424-428. [13] 胡志明,把智波,熊伟,等.低渗透油藏微观孔隙结构分析[J].大庆石油学院学报,2006,30(3):51-53. [14] 于俊波,郭殿军,王新强.基于恒速压汞技术的低渗透储层物性特征[J].大庆石油学院学报,2006,30(2):22-25. [15] 高辉,解伟,杨建鹏,等.基于恒速压汞技术的特低—超低渗砂岩储层微观孔喉特征[J].石油实验地质,2011,33(2):206-211. [16] 解伟,张创,孙卫,等.恒速压汞技术在长2储层孔隙结构研究中的应用[J].断块油气田,2011,18(5):549-551. [17] Pittman E D.Relationship of porosity and permeability to various parameters derived from mercury injection:Capillary pressure curves for sandstone[J].AAPG Bulletin,1992,176(2):191-198. [18] Wardlaw N C,Tayle R P.Mercury capillary pressure curves and the interpretation of pore structure and fluid distribution[J].Bulletin of Canadian Petroleum Geology,1976,24(2):225-262. [19] 张创,孙卫,解伟.低渗储层有效喉道半径下限研究:以苏北盆地高邮凹陷沙埝南地区为例[J].地质科技情报,2011,30(1):103-107. [20] 杨正明,张英芝,郝明强,等.低渗透油田储层综合评价方法[J].石油学报,2006,27(2):64-67. [21] 高辉,孙卫.特低渗砂岩储层微观孔喉特征的定量表征[J].地质科技情报,2010,29(4):67-72. [22] 吕伟峰,秦积舜,吴康云,等.低渗岩石孔渗及相对渗透率测试方法综述[J].特种油气藏,2011,18(3):1-6. [23] 何顺利,焦春艳,王建国,等.恒速压汞与常规压汞的异同[J].断块油气田,2011,18(2):235-237. [24] 屈乐,孙卫,谢佃和,等.牛圈湖油田开发初期高含水原因探析[J].西北大学学报:自然科学版,2011,41(6):1037-1043. [25] 庞军刚,李文厚,肖丽.陕北地区延长组坳陷湖盆浅湖与深湖亚相的识别特征[J].兰州大学学报:自然科学版,2009,45(6):36-40. [26] 吴元燕,吴胜和,蔡正旗.油矿地质学[M].北京:石油工业出版社,2011:190-192. [27] Sun Wei,Qu Zhihao,Tang Guoqing.Characterization of water injection in low permeability rock using sandstone micromobles[J].Journal of Petroleum Technology,2004,56(5):71-72. [28] Sun Wei,Tang Guoqing.Visual Study of Water Injection in low Permeable Sandstone[J].Journal of Canadian Petroleum Technology,2006,45(11):21-26. [29] 牛世忠,胡望水,熊平,等.红岗油田高台子油藏储层大孔道定量描述[J].石油实验地质,2012,34(2):201-206. [30] 郭平,徐云林,石美,等.高温高压水洗物性变化实验研究:以塔里木轮南油田TⅠ油组为例[J].石油实验地质,2012,34(4):454-458.
点击查看大图
计量
- 文章访问数: 1272
- HTML全文浏览量: 34
- PDF下载量: 977
- 被引次数: 0