致密砂岩储层岩石脆性评价及相关因素分析

中国石油勘探 ›› 2016, Vol. 21 ›› Issue (6): 50-57.

致密砂岩储层岩石脆性评价及相关因素分析

王伟明¹,李勇¹,汪正江²,聂舟³,陈斌¹,颜照坤¹,闫亮¹,邵崇建¹,陆胜杰¹

1油气藏地质及开发工程国家重点实验室(成都理工大学沉积地质研究院)
2中国地质调查局成都地调中心
3中国石油西南油气田公司川西北气矿

出版日期:2016-11-10 发布日期:2016-11-10
基金资助:
家自然科学基金“龙门山冲断带（中段）异地系统晚三叠世地层标定与原型盆地恢复”(41372114)；青年科学基金“龙门山前陆盆地南部晚三叠世沉积——物源体系及其构造动力学指示”（41502116），“青藏高原东北缘达日断裂中段晚第四纪活动特征及其构造转换形式研究”（41402159）；国土资源部地质调查项目“龙门山前缘油气勘探新领域研究”(12120115004501-01)。

Evaluation of rock brittleness and analysis of related factors for tight sandstone reservoirs

Wang Weiming¹,Li Yong¹,Wang Zhengjiang²,Nie Zhou³,Chen Bin¹,Yan Zhaokun¹,Yan Liang¹,Shao Chongjian¹,Lu Shengjie¹

1 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Institute of Sedimentary Geology, Chengdu University of Technology)
2 Chengdu Center, China Geological Survey
3 Northwest Sichuan Gas Mine, PetroChina Southwest Oil & Gas Field Company

Online:2016-11-10 Published:2016-11-10

摘要/Abstract

摘要： 致密砂岩脆度是致密油气藏勘探开发的关键因素之一。以龙门山前陆盆地为例，基于野外露头岩样、钻井岩心、岩石薄片、地球化学特征等地质资料，通过镜下砂岩成分鉴定和X射线衍射矿物含量分析，发现研究区砂岩岩屑含量较高，因此建立了符合区域背景的岩石脆度公式，结果表明龙门山前陆盆地致密砂岩储层脆度较高。岩石力学特征分析表明，研究区内储层岩体具有杨氏模量高、泊松比低的特点，具有较好的脆性特征和可压裂潜力。最后，进行了砂岩体地球化学特征指数和砂岩脆度的相关性分析，论证了致密砂岩成分变异指数（ICV）和化学风化指数（CIA）与岩石脆度的关系。

关键词: 致密砂岩脆度是致密油气藏勘探开发的关键因素之一。以龙门山前陆盆地为例, 基于野外露头岩样、钻井岩心、岩石薄片、地球化学特征等地质资料, 通过镜下砂岩成分鉴定和X射线衍射矿物含量分析, 发现研究区砂岩岩屑含量较高, 因此建立了符合区域背景的岩石脆度公式, 结果表明龙门山前陆盆地致密砂岩储层脆度较高。岩石力学特征分析表明, 研究区内储层岩体具有杨氏模量高、泊松比低的特点, 具有较好的脆性特征和可压裂潜力。最后, 进行了砂岩体地球化学特征指数和砂岩脆度的相关性分析, 论证了致密砂岩成分变异指数（ICV）和化学风化指数（CIA）与岩石脆度的关系。

Abstract: Brittleness of tight sandstone is a key element for exploration and development of tight reservoirs. Taking the Longmenshan Foreland Basin as an example, microscopic identification of sandstone composition and mineral content analysis with X-ray diffraction were carried out with the geological data, e.g. outcrop rock samples, drilling cores, rock slices, and geochemical characteristics. It was demonstrated that the sandstone has higher debris content. Accordingly, a rock brittleness formula corresponding to the regional setting was established. The research results show that the tight sandstone reservoirs in the Longmenshan Foreland Basin are more brittle. According to the analysis of rock mechanics features, the reservoir rocks in the study area are characterized by high Young's modulus and low Poisson's ratio, with better brittle behavior and fracturing potential. Finally, the correlation between geochemical characteristic index and brittleness of sandstones was analyzed, and the relationship between index of compositional variability (ICV) and chemical index of alteration (CIA) of tight sandstones were discussed.

Key words: tight sandstone, brittleness of composition, mechanical characteristics, geochemistry, oil and gas exploration

王伟明, 李勇, 汪正江, 聂舟, 陈斌, 颜照坤, 闫亮, 邵崇建, 陆胜杰. 致密砂岩储层岩石脆性评价及相关因素分析[J]. 中国石油勘探, 2016, 21(6): 50-57.

Wang Weiming, Li Yong, Wang Zhengjiang, Nie Zhou, Chen Bin, Yan Zhaokun, Yan Liang, Shao Chongjian, Lu Shengjie. Evaluation of rock brittleness and analysis of related factors for tight sandstone reservoirs[J]. China Petroleum Exploration, 2016, 21(6): 50-57.

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