地学前缘 ›› 2016, Vol. 23 ›› Issue (1): 240-252.DOI: 10.13745/j.esf.2016.01.022

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迪北气田三维探区下侏罗统阿合组裂缝定量预测

于璇，侯贵廷，李勇   

  1. 1. 教育部造山带与地壳演化重点实验室; 北京大学 地球与空间科学学院, 北京 100871
    2. 中国石油 塔里木油田分公司 勘探开发研究院, 新疆 库尔勒 841000
  • 收稿日期:2015-03-06 修回日期:2015-06-12 出版日期:2016-01-15 发布日期:2016-01-15
  • 通讯作者: 侯贵廷，男，教授，博士生导师，长期从事构造地质学和石油地质学的教学和科研工作。
  • 作者简介:于璇(1990—)，男，博士研究生，构造地质学专业。E-mail：pkuyuxuan@pku.edu.cn
  • 基金资助:

    中国石油塔里木油田分公司项目(041013110025)；中国石油重大专项课题(2014A0213)

Quantitative prediction of tectonic fractures of Lower Jurassic Ahe Formation sandstones in Dibei gasfield.

  • Received:2015-03-06 Revised:2015-06-12 Online:2016-01-15 Published:2016-01-15

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摘要：

塔里木盆地库车坳陷的下侏罗统阿合组低孔低渗砂岩是迪北气田的主要油气储集层，构造裂缝作为油气运移通道和储集空间，其发育特征和分布规律是制约油气勘探开发的关键。本次研究采用迪北气田最新的三维构造图，考虑区域地质背景、地层起伏、断层分布等诸多因素，将目的层下侏罗统阿合组分为3段，基于实测岩石力学参数，利用三维弹性有限元数值模拟方法，计算获得的库车坳陷新近纪构造应力场的大小、方向与实测应力感数据比较吻合。以此构造应力场为基础，在迪北地区11口井的约束下，用岩石破裂值和应变能密度构建起的“二元法”对阿合组每一层段的裂缝密度分布规律进行预测。结果表明：平面上，迪北斜坡带的依南2—迪西1—迪北104区域、迪北101—依南5以南区域和吐孜1井以西—吐孜3井以北的区域为裂缝相对发育区；垂向上，阿合组中下段要比上段裂缝更为发育。该构造裂缝预测结果对迪北气田致密砂岩储层的勘探开发提供了新的参考依据。

关键词: 构造裂缝, 致密砂岩, 阿合组, 有限元, 二元法

Abstract:

The lower Jurassic lowporosity and lowpermeability tight sandstone is a major reservoir of Dibei gas field in the Kuqa depression, Tarim Basin. As a migration channel and reservoir space, the development features and distribution of tectonic fractures is the key to oil and gas exploration and development. This study adopts the latest 3D structural map of the Dibei area, taking geological setting, geometry of strata, and faults into consideration, and divides the Ahe Formation into three sections. Based on the measured rock mechanics parameters, a three dimensional elastic finite element numerical simulation method is used to calculate the maximum principal stress of Pliocene structural stress field in the Kuqa depression. The calculated results matched the observed results. Under the restraints of 11 wells, the two factor method is proposed to simulate the development of tectonic fractures by means of rock failure value and strain energy density together to predict tectonic fracture density of the three sections of the Ahe Formation. The results show that the Yinan2Dixi1Dibei104 area and the area to the south of Dibei101Yinan5 as well as the area to the west of Tuzi1 and to the north of Tuzi3 have the highest density of fractures; in addition，the J1a23 formation is easier to be cracked than the J1a1 formation. The prediction results of tectonic fractures in the Ahe Formation provide a new geological reference for the exploration and development of Dibei gasfield.

Key words: tectonic fractures, tight sandstone, Ahe Formation, finite element, two factor method

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