克拉苏构造带盐下超深层断背斜裂缝带发育模式及预测方法

发布时间：2018-02-25 06:28

本文关键词： 裂缝分布规律成因类型物理模拟克拉苏构造带超深层　出处：《大地构造与成矿学》2017年01期 　论文类型：期刊论文

【摘要】：克拉苏构造带盐下超深层埋深大于6500 m的断背斜圈闭,白垩系砂岩储层内部裂缝普遍发育且分布复杂,对储层产能影响较大,目前仍然缺乏有效的裂缝发育模式指导裂缝带建模。本文通过钻、测井资料及物理模拟实验,分析了盐下断背斜内裂缝类型及空间分布规律:(1)盐下深层断背斜裂缝带可以分为"挤压剪切型、拱张型与调节型"三种成因类型,挤压剪切型裂缝带主要分布于断背斜翼部,受推覆作用而成,平面呈近EW走向或NW-SE走向。拱张型则主要发育于背斜核部,受控于断背斜拱张作用,平面近EW走向,调节型裂缝带则发育于断背斜的构造转换部位,呈近SN走向;(2)物理模拟实验证明拱张型裂缝带受褶皱褶曲度控制,剪切型、调节型裂缝带则受逆冲断层断距控制,根据断背斜拱升角及垂直断距变化可以预测裂缝带的平面分布;(3)地质资料和物理模拟实验证明"调节裂缝带"及"拱张裂缝带"张开程度最大,有利于改善超深层储层的储集性能,这类裂缝带的单井天然气产量较高。
[Abstract]:In the Klassou structural belt, the fractures in the Cretaceous sandstone reservoir are widely developed and distributed, which have a great influence on the reservoir productivity because of the fault diagonal trap with a buried depth of more than 6500 m under salt in the Klassou structural belt. At present, there is still a lack of effective fracture development model to guide fracture zone modeling. In this paper, through drilling, logging data and physical simulation experiments, In this paper, the types and spatial distribution of internal fractures in undersalt fault slant are analyzed. The deep fracture zones under salt can be divided into three types: extrusion shear type, arch extension type and regulating type. The extrusion shear type fracture zone is mainly distributed in the diagonal wing of the back of the fracture. The plane is near EW strike or NW-SE strike, the arch type is mainly developed in the nucleus of anticline, controlled by the diagonal arch action, the plane is near EW strike, and the regulated fracture zone is developed in the structural transition part of the back slope. The physical simulation experiments show that the arch type fracture zone is controlled by fold and fold degree, while the shear type and regulating type fracture zone is controlled by thrust fault fault fault spacing, and the arch type fracture zone is controlled by the fold and fold degree, while the shear type and the regulating type fracture zone are controlled by the thrust fault break. The plane distribution of fracture zone can be predicted according to the rise angle of oblique arch and the change of vertical fault distance. The geological data and physical simulation experiment prove that the opening degree of "adjust fracture zone" and "arch tension fracture zone" is the largest. It is beneficial to improve the reservoir performance of ultra-deep reservoir, and the single well natural gas production of this kind of fracture zone is relatively high.
【作者单位】：中国石油天然气股份有限公司塔里木油田分公司勘探开发研究院;
【基金】：国家科技重大专项课题(2011ZX05003-004) 国家重点基础研究发展计划(2011CB201100)联合资助
【分类号】：P618.13;P542

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