沾化凹陷罗家地区沙三下亚段页岩储层的岩石力学与脆性评价研究

doi:10.3969/j.issn.1672-7703.2017.06.008

摘要/Abstract

摘要： 页岩作为一种非常规储层，典型特点是低孔低渗，提高产能必须进行大规模的水力压裂，而储层压裂必须考虑脆性这一重要因素。沾化凹陷罗家地区沙三下亚段页岩油气资源丰富，从矿物组成、地球物理测井和三轴应力实验测试3个方面来研究页岩的脆性特征。研究结果表明，从页岩矿物组成角度来看，页岩脆性指数达到了56.3%，压裂后有利于形成复杂缝网系统；从地球物理的角度来看，页岩整体表现出高杨氏模量、低泊松比的特点，同时页岩脆性指数也都超过了40%，同样证明脆性程度较高；从三轴应力实验测试的角度来看，岩心样品的三轴压缩应力-应变曲线整体来说破坏形式都属于脆性破坏，再次表明页岩的脆性较好。综合以上结果可以得出这样的结论：沾化凹陷罗家地区沙三下亚段页岩脆性较好，具有一定的可压裂性。

关键词: 沾化凹陷, 页岩脆性, 杨氏模量, 泊松比, 三轴应力实验

Abstract: Shale, as one type of unconventional reservoir, is characterized by low porosity and low permeability. To improve its deliverability, large-scale hydraulic fracturing is required. Brittleness of the rock must be taken into consideration during the reservoir fracturing. The shale of the lower third Member of Shahejie Formation (lower Sha 3 Member or lower Es₃) in the Luojia area of the Zhanhua sag is abundant with oil and gas resources. Its brittleness was investigated in respect of mineral composition, geophysical logging and triaxial stress test. The results show that, in respect of mineral composition, the brittleness index of the lower Es₃ shale is 56.3%, suggesting that complex fracture system may easily form after fracturing; in respect of geophysical logging, the lower Es₃ shale exhibits high Young's modulus and low Poisson's ratio, and its brittleness index is over 40%, which also prove that the shale is very brittle; in respect of triaxial stress test, the triaxial compressive stress-strain curves of the core samples present all brittle failure, which once again shows high brittleness of the shale. Accordingly, it can be concluded that the brittleness of the lower Es 3 shale in the Luojia area is good, revealing certain fracturability.

Key words: Zhanhua sag, shale brittleness, Young's modulus, Poisson ratio, triaxial stress test

中图分类号:

TE132

陆益祥, 潘仁芳, 唐廉宇, 李笑天, 武文竞, 沈禄银. 沾化凹陷罗家地区沙三下亚段页岩储层的岩石力学与脆性评价研究[J]. 中国石油勘探, 2017, 22(6): 69-77.

Lu Yixiang, Pan Renfang, Tang Lianyu, Li Xiaotian, Wu Wenjing, Shen Luyin. Rock mechanics and brittleness of shale reservoirs in the lower Sha 3 Member in Luojia area, Zhanhua sag[J]. China Petroleum Exploration, 2017, 22(6): 69-77.

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