致密油储层地应力特征及其对物性的影响——以鄂尔多斯盆地上三叠统延长组为例

高毅; 林利飞; 尹帅; 胡国祥; 马绒利

doi:10.11781/sysydz202102250

致密油储层地应力特征及其对物性的影响——以鄂尔多斯盆地上三叠统延长组为例

doi: 10.11781/sysydz202102250

高毅^1,,
林利飞¹,
尹帅^{2, 3, ,},
胡国祥¹,
马绒利¹

1.
延长油田股份有限公司开发部, 陕西延安 716000
2.
西安石油大学地球科学与工程学院, 西安 710065
3.
山东科技大学地球科学与工程学院, 山东青岛 266590

基金项目:

延长油田开发部项目 ycsy2018ky-B-04

山东省重点研发计划（公益类） 2019 GGX103021

详细信息

作者简介:
高毅(1982—)，男，硕士，高级工程师，从事油气田开发研究工作。E-mail: 85053574@qq.com

通讯作者:
尹帅(1989—)，男，博士，讲师，从事石油地质教学与研究工作。E-mail: speedysys@163.com

中图分类号: TE122.23
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- 文章访问数: 371
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- 被引次数: 0
出版历程
- 收稿日期: 2020-09-02
- 修回日期: 2021-02-19
- 刊出日期: 2021-03-28

Characteristics of in situ stress of tight oil reservoirs and its influence on petrophysical properties: a case study of Upper Triassic Yanchang Formation in Ordos Basin

GAO Yi^1
,,
LIN Lifei¹,
YIN Shuai^{2, 3
, ,},
HU Guoxiang¹,
MA Rongli¹

1.
Yanchang Oilfield Co., Ltd., Yan'an, Shaanxi 716000, China
2.
School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China
3.
College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China

摘要

摘要: 致密储层物性及流体赋存状态均受现今地应力的影响。以往对于鄂尔多斯盆地中西部地区上三叠统延长组的岩石力学性质及地应力研究较少，制约了致密油气的高效勘探、开发。以鄂尔多斯盆地吴起、志丹及定边地区为例，利用大量薄片、物性、岩石力学、声学、全波列阵列声波测试及压裂测试资料，对3个地区长6—长8油层组的岩石力学性质、地应力特征及其对储层物性的影响进行了评价。利用测井方法识别出3种地应力状态：吴起地区长6—长8的变化不大，其现今的应力活动性较弱；志丹地区的水平应力活动性深层要大于浅层，较强的水平应力强度主要集中在长7₃及长8；定边地区的水平应力活动性从长6到长8整体较强，浅层的水平应力强度要略强于深层。研究区水平应力梯度有从西北向东南逐渐递增的趋势；水平主应力差的增加不是一定使岩石减孔，其造成的应力平面非均质性会使岩石孔隙度变化出现3种不同的路径；而水平主应力差的增加会造成岩石渗透率的降低，但影响并不显著。
- 地应力 /
- 水平应力差 /
- 致密油 /
- 储层 /
- 延长组 /
- 上三叠统 /
- 鄂尔多斯盆地
Abstract: The petrophysical properties of tight reservoirs and the state of fluid occurrence are affected by current geostress. In the past, there were few studies on the rock mechanical properties and in situ stress of the Yanchang Formation in the central and western regions of the Ordos Basin, which restricted the efficient exploration and development of tight oil and gas. A systematic study was carried out on the rock mechanical properties, in situ stress characteristics and their effects on the petrophysical properties of the Chang 6-Chang 8 reservoirs in the Wuqi, Zhidan and Dingbian areas in the Ordos Basin. A reliable method of in situ stress logging interpretation using fracturing methods and logging models was established. The Chang 6 to Chang 8 in Wuqi area is not significantly stressed. The horizontal stress activity deep in the Zhidan area is greater than that in the shallow layers, with the strong horizontal stress intensity mainly concentrated in Chang 7₃ and Chang 8. The horizontal stress activity of the Dingbian area is relatively strong from Chang 6 to Chang 8, and the horizontal stress intensity of the shallow layer is slightly stronger than that of the deep layer. The stress gradients in the three work areas are determined. The horizontal principal stress gradient gradually increases from northwest to southeast. Finally, the influence of horizontal compression stress on the path of rock compaction and the petrophysical properties of the reservoir are systematically discussed. It was found that the increase of σ_H-σ_h did not cause the loss of rock pores alone. The stress plane heterogeneity will cause three different paths of rock porosity changes. However, the increase of the horizontal principal stress difference will mainly cause a decrease of rock permeability.
- in situ stress /
- horizontal stress difference /
- tight oil /
- reservoir /
- Yanchang Formation /
- Upper Triassic /
- Ordos Basin

HTML全文

图 1 鄂尔多斯盆地西部研究区地理位置(a)和地层单元划分及沉积相特征(b)

Figure 1. Location of study area (a) and stratigraphic units and sedimentary facies (b), western Ordos Basin

下载: 全尺寸图片幻灯片

图 2 鄂尔多斯盆地西部延长组目的层致密砂岩储层显微图像特征

a.永金491井，1 731.46 m，粒间孔及粒间溶蚀孔，长6；b.永金669井，1 839.71 m，岩屑溶孔，长6；c.永金669井，1 839.71 m，长石溶孔，长6；d.方668井，1 857.87 m，粒间孔，长7；e.方668井，1 857.87 m，微裂缝，长7；f.定探4578井，2 212.99 m，粒间孔及长石溶孔，长8；g.定探4578井，2 213.00 m，岩屑溶孔，长8；h.定探4578井，2 244.80 m，微裂缝，长8

Figure 2. Microscopic photographs of tight sandstone reservoirs in Yanchang Formation, western Ordos Basin

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图 3 鄂尔多斯盆地西部

长6—长8段纵横波时差之间的关系

Figure 3. Relationship between vertical and horizontal wave time differences of Chang 6 to Chang 8 members in western Ordos Basin

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图 4 鄂尔多斯盆地西部目的层动静态岩石力学参数转换关系模型

Figure 4. Dynamic and static rock mechanics parameter conversion model of target layer, western Ordos Basin

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图 5 鄂尔多斯盆地西部研究区地应力纵向分布特征

Figure 5. Characteristics of longitudinal distribution of in situ stress in work areas, western Ordos Basin

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图 6 鄂尔多斯盆地西部目的层水平方向最大及最小地应力相关性分析

Figure 6. Correlation of maximum and minimum ground stress in horizontal direction of Yanchang Formation, western Ordos Basin

下载: 全尺寸图片幻灯片

图 7 鄂尔多斯盆地西部目的层地应力状态的识别结果分类情况

Figure 7. Classification of recognition results of ground stress state of target layer, western Ordos Basin

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图 8 基于成像测井的钻井诱导缝特征

Figure 8. Drilling induced fracture characteristics based on imaging logging

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图 9 鄂尔多斯盆地西部目的层储层物性参数、水平应力差及其演化路径分析

Figure 9. Reservoir petrophysical parameters, horizontal stress difference and evolution path of target layer, western Ordos Basin

下载: 全尺寸图片幻灯片

表 1 鄂尔多斯盆地西部研究区目的层应力梯度计算结果

Table 1. Calculated results of stress gradient of target layer, western Ordos Basin

地区	应力梯度/(MPa·m^-1)
地区	σ_H	σ_h	σ_v
定边	0.013	0.008	0.026
吴起	0.031	0.016	0.026
志丹	0.042	0.029	0.026

下载: 导出CSV

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