玛湖凹陷百口泉组砾岩脆性特征及其影响因素分析
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1.新疆油田分公司勘探开发研究院;2.西南石油大学

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TE3

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国家科技重大专项“准噶尔盆地致密油开发示范工程”子任务“砂砾岩致密油 示范区甜点优选及建模”(2017ZX05070-001)资助。


Brittle characteristics and influencing factors of conglomerate of Baikouquan formation in Mahu depression
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Research Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChina

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    摘要:

    准噶尔盆地玛湖凹陷百口泉组是10亿吨特大型玛湖砾岩油田主力开发层系之一,属于典型的低孔、低渗透—特低渗透储集层,需通过体积压裂形成大规模复杂缝网实现高效开发,砾岩地层的脆性特征是压裂形成复杂缝网的关键力学指标。已有岩石脆性的大量研究主要围绕页岩地层,但对结构复杂、强非均质砾岩的脆性特征上缺乏深入、系统认识。围绕百口泉组砾岩的脆性特征、评价方法以及影响因素,通过开展井下砾岩取芯的岩石物理与岩石力学实验,综合岩样变形与破坏特征分析,明确了百口泉组砾岩在地层围压条件下呈现低脆性-塑性;基于实验数据的不同脆性指数计算对比,结合实验呈现的脆性特征,明确了基于割线模量的脆性指数能够更好表征百口泉组砾岩的脆性特征;砾岩脆性指数与围压、孔隙度、密度关系密切,随围压、孔隙度增大,砾岩的脆性降低、塑性增强;随密度增大,砾岩的脆性增强、塑性降低。研究认识对压裂工程“甜点”优选、压裂工程设计具有重要意义。

    Abstract:

    Baikouquan formation in Mahu sag, Junggar basin is one of the main development strata of 1 billion ton super large Mahu conglomerate oilfield. It belongs to a typical low porosity, low permeability ultra-low permeability reservoir. It needs to form a large-scale complex fracture network through volumetric fracturing to achieve efficient development. The brittleness of conglomerate formation is the key mechanical index of fracturing to form a complex fracture network. A large number of studies on rock brittleness mainly focus on shale formation, for the complex and strongly heterogeneous conglomerate, the brittleness characteristics need to be deeply and systematically studied. Focusing on the brittleness characteristics, evaluation methods and influencing factors of the conglomerate of Baikouquan formation, through the rock physics and rock mechanics experiments of conglomerate coring and the analysis of rock sample deformation and failure characteristics, it is clear that the conglomerate of Baikouquan formation presents low brittleness or plasticity under the condition of formation confining pressure; Based on the calculation and comparison of different brittleness indexes, combined with the brittleness characteristics presented in the experiment, it is clear that the brittleness index based on secant modulus can better characterize the brittleness characteristics of conglomerate in Baikouquan formation; The brittleness index of conglomerate is closely related to confining pressure, porosity and density. With the increase of confining pressure and porosity, the brittleness of conglomerate decreases and the plasticity increases; With the increase of density, the brittleness of conglomerate increases and the plasticity decreases. The research and understanding is of great significance to the optimization of “sweet spot” and fracturing engineering design.

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王英伟,丁乙. 玛湖凹陷百口泉组砾岩脆性特征及其影响因素分析[J]. 科学技术与工程, , ():

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  • 收稿日期:2021-11-21
  • 最后修改日期:2022-05-03
  • 录用日期:2022-05-07
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