Impact of diagenetic facies on mechanical properties of sandstone rock in low-permeability reservoirs: a case study of the Upper Paleozoic gas reservoir in east Ordos Basin

doi:10.7623/syxb201610005

Acta Petrolei Sinica ›› 2016, Vol. 37 ›› Issue (10): 1256-1264.DOI: 10.7623/syxb201610005

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Impact of diagenetic facies on mechanical properties of sandstone rock in low-permeability reservoirs: a case study of the Upper Paleozoic gas reservoir in east Ordos Basin

Cheng Jinghua, Li Rongxi, Qin Xiaoli, Li Delu, Zhao Bangsheng, Li Jiajia, Wu Xiaoli, Wang Ning

School of Earth Science and Resources, Chang'an University, Shaanxi Xi'an 710054, China

Received:2016-04-07 Revised:2016-08-16 Online:2016-10-25 Published:2016-11-09

成岩相对低渗透储层砂岩岩石力学性质的控制——以鄂尔多斯盆地东部上古生界天然气储层为例

程敬华, 李荣西, 覃小丽, 李得路, 赵帮胜, 李佳佳, 吴小力, 王宁

长安大学地球科学与资源学院陕西西安 710054

通讯作者: 李荣西,男,1966年6月生,1989年获西安地质学院学士学位,1998年获中国矿业大学(北京)博士学位,现任长安大学教授、博士生导师,主要从事石油地质、流体地质等方面的研究工作。Email:rongxi99@163.com
作者简介:程敬华,男,1991年11月生,2014年获长安大学学士学位,现为长安大学硕士研究生,主要从事石油地质方面研究工作。Email:450683992@qq.com
基金资助:
国家自然科学基金项目（No.40173005）和国家自然科学基金青年科学基金项目（No.41602128）资助。

Abstract

Abstract:

Mechanical properties of sandstone play an important role in reservoir fracturing design. Based on petrographic observations and rock mechanics tests, a study is conducted on the types of diagenetic facies and mechanical properties of low-permeability reservoir in the upper paleozoic low-permeability sandstone of East Ordos Basin and the petrographic factors which influence rock mechanical properties are also analyzed. In the study area, 6 types of diagenetic facies are detected in the low permeability sandstone reservoir, i.e., matrix filling and strong compaction altered tight facies, quartz-enlarging siliceous cementation-intergranular pore facies, carbonate cementation metasomatism tight facies, calcium dissolution pore facies, matrix dissolution pore facies and clastics dissolution pore facies. For the sandstone with diagenetic facies, a certain difference exists in the compressive strength, mass modulus and poisson ratio. The more the brittle minerals and siliceous cements contained in sandstone and the higher the degree of compaction and recrystalization is, the higher the compressive strength will be, or vice versa. The higher the sandstone porosity is, the lower the elastic modulus will be. The more brittle minerals (e.g., quartz), lower compaction degree and higher porosity will lead to a lower poisson ratio, or vice versa. The sandstone with quartz-enlarging siliceous cementation facies, calcareous cementation-dissolution pore facies and matrix dissolution pore facies has high brittleness coefficient and high fracability, and those with other facies have relatively low fracability.

Key words: diagenetic facies, low permeability reservior, sandstone, rock mechanical properties, fracability, Ordos Basin

摘要：

砂岩岩石力学性质对储层压裂设计具有重要影响，通过岩相学观察以及岩石力学试验，研究了鄂尔多斯盆地东部上古生界低渗透储层砂岩成岩相类型、岩石力学参数以及可压裂性，分析了影响岩石力学性质的岩相学因素。研究区上古生界低渗透储层砂岩可分出6种成岩相：蚀变杂基充填强压实致密成岩相、石英加大硅质胶结粒间孔成岩相、碳酸盐胶结交代致密成岩相、钙质溶蚀孔成岩相、杂基溶蚀孔成岩相和岩屑溶蚀孔成岩相。不同成岩相砂岩的抗压强度、弹性模量和泊松比均有所差异，脆性矿物含量、硅质胶结物含量以及压实重结晶程度越高的成岩相，则其抗压强度越大，反之则越小；孔隙度越大的成岩相，弹性模量越小；石英等脆性矿物含量越高、压实程度越弱、孔隙度越高的成岩相，则其泊松比越小，反之则越大。脆性系数较大的石英加大硅质胶结成岩相、钙质胶结溶蚀孔成岩相和杂基溶蚀孔成岩相可压裂性好，其他几类成岩相砂岩可压裂性相对较差。

关键词: 成岩相, 低渗透储层, 砂岩, 岩石力学性质, 可压裂性, 鄂尔多斯盆地

CLC Number:

TE122

Cheng Jinghua, Li Rongxi, Qin Xiaoli, Li Delu, Zhao Bangsheng, Li Jiajia, Wu Xiaoli, Wang Ning. Impact of diagenetic facies on mechanical properties of sandstone rock in low-permeability reservoirs: a case study of the Upper Paleozoic gas reservoir in east Ordos Basin[J]. Acta Petrolei Sinica, 2016, 37(10): 1256-1264.

程敬华, 李荣西, 覃小丽, 李得路, 赵帮胜, 李佳佳, 吴小力, 王宁. 成岩相对低渗透储层砂岩岩石力学性质的控制——以鄂尔多斯盆地东部上古生界天然气储层为例[J]. 石油学报, 2016, 37(10): 1256-1264.

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Impact of diagenetic facies on mechanical properties of sandstone rock in low-permeability reservoirs: a case study of the Upper Paleozoic gas reservoir in east Ordos Basin

成岩相对低渗透储层砂岩岩石力学性质的控制——以鄂尔多斯盆地东部上古生界天然气储层为例

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