Abstract
Maintaining caprock integrity is prerequisite for hydrocarbon accumulation. And gypsolyte caprock integrity is mainly affected by fracturing. Composition, damage behavior and mechanical strength of Paleocene Artashi Formation gypsolyte rock that seals significant petroleum in the Kashi Sag of Tarim Basin had been revealed via X-ray diffraction and triaxial compression test. The results indicate the Artashi Formation can be lithologically divided into the lower and upper lithologic members. The lower member comprises gypsum as the dominant mineral, and the cohesion and friction coefficient are 8 MPa and 0.315, respectively. Similarly, the upper lithologic member consists mainly of anhydrite at the cohesion and coefficient of internal friction values of 18 MPa and 0.296. Given that the failure criterion and brittle-ductile transition factors during burial, the sealing integrity of Artashi Formation can be quantized for seven different stages. The reservoirs at the bottom of Artashi Formation caprock buried from 2285 m to 3301 m are expected to be the most favorable exploration target in the Kashi Sag.
摘要
盖层保持自身的封盖完整性是油气聚集成藏中的关键因素,膏岩盖层的完整性主要受破裂作用 的影响。本文主要通过X射线衍射和三轴压缩实验研究了塔里木盆地喀什凹陷古近系阿尔塔什组膏岩 盖层的矿物成分、变形过程、岩石力学强度、应力-应变等特征。结果表明,阿尔塔什组具有明显的 上下两段式沉积特点,下段主要由白色石膏组成,内聚力和内摩擦因数分别为8 MPa和0.315;上段 则主要为灰白色硬石膏,内聚力和内摩擦因数分别为18 MPa和0.296。综合考虑埋藏过程中的破裂和 脆塑性转换因素,阿尔塔什组膏岩的封盖过程可以量化表征为7个阶段,埋藏深度在2285~3301 m的 膏岩之下的储集层是本区最有利的勘探目标。
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Foundation item: Project(41672121) supported by the National Natural Science Foundation of China; Project(D1438) supported by the China Geological Survey
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Liao, X., Wang, Zl., Fan, Cy. et al. Quantitative characterization of sealing integrity by caprock of Paleocene Artashi Formation gypsolyte rock in Kashi Sag of Tarim Basin, NW China. J. Cent. South Univ. 26, 695–710 (2019). https://doi.org/10.1007/s11771-019-4040-8
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DOI: https://doi.org/10.1007/s11771-019-4040-8
Key words
- brittle-ductile transition
- failure criterion
- sealing integrity
- gypsolyte caprock
- Artashi Formation
- Kashi Sag