黔北地区窄陡型向斜页岩气水平井地质导向技术对策

吴松; 于继良; 徐尚; 蓝宝锋; 李龙; 李刚权

doi:10.19509/j.cnki.dzkq.2022.0136

黔北地区窄陡型向斜页岩气水平井地质导向技术对策

doi: 10.19509/j.cnki.dzkq.2022.0136

吴松^1,,
于继良¹,
徐尚²,
蓝宝锋³,
李龙^1, ,,
李刚权¹

1.
贵州页岩气勘探开发有限责任公司, 贵州遵义 563499
2.
中国石油大学(华东)山东省深层油气重点实验室, 山东青岛 266580
3.
贵州能源产业研究院有限公司, 贵阳 550000

基金项目:

贵州省科技重大专项黔科合战略找矿[2022]ZD2005

贵州省科学技术厅科技支撑项目黔科合支撑[2021]一般405

详细信息

作者简介:
吴松(1995-), 男, 助理工程师, 主要从事页岩气勘探开发研究与管理工作。E-mail: 1711913985@qq.com

通讯作者:
李龙(1988-), 男, 工程师, 主要从事页岩气勘探开发研究与管理工作。E-mail: 1055779433@qq.com

中图分类号: TE37
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- 文章访问数: 709
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- 被引次数: 0
出版历程
- 收稿日期: 2021-10-25
- 网络出版日期: 2022-09-07

Shale gas horizontal well geosteering technologies and countermeasures research in narrow and steep syncline formations of northern Guizhou area

1.
Guizhou Shale Gas Exploration and Development Co., Zunyi Guizhou 563499, China
2.
Shandong Provincial Key Laboratory of Deep Oil& Gas, China University of Petroleum (East China), Qingdao Shandong 266580, China
3.
Guizhou Energy Industry Research Institute Co., Ltd., Guiyang 550000, China

摘要

摘要:
黔北地区五峰组-龙马溪组页岩地层残留于窄陡型向斜中, 具有地层速度变化大, 地震资料靶点预测精度低; 地层倾角变化频, 地层走向及轨迹难以把控; 地层稳定性差, 井眼扩大严重等难点。增大了地质导向难度, 水平井钻遇率低。针对这些问题, 梳理分析了实钻中地质导向遇到的难点, 通过井震结合, 完善三维地震速度模型, 精确提取各地层、各方位地层视倾角; 实钻中通过多元厚度建模, 不断矫正细化对靶点深度的预测, 优化随钻三维轨迹; 进入箱体后, 强化地球物理响应特征, 对随钻曲线进行正演提取及反演对比, 利用多元元素谱及成像技术精细刻画箱体成像特征。在7口井的钻探应用中靶点误差与设计降低至25 m, 优质页岩钻遇率提高到99.2%, 箱体钻遇率从87.6%提高至96.5%, 其中3口实现了中靶率、优质页岩钻遇率和箱体钻遇率3个100%的地质导向成果。类似于黔北地区这种窄陡型残余留向斜地质导向难点通过该套技术对策可以及时避开小褶皱等细微构造变化, 有效保障水平井箱体钻遇率, 为水平井地质导向提供了扎实的技术支撑。
- 黔北地区 /
- 五峰组-龙马溪组 /
- 页岩气 /
- 窄陡型向斜 /
- 地质导向
Abstract:
Northern Guizhou area is located at the edge of the Sichuan Basin, and its structure belongs to Wuling fold area. Wufeng Longmaxi shale stratum is in a series of narrow and steep residual synclines, and the main developed shale stratum is within five meters of the bottom of the Longmaxi Formation, with a thin thickness. Due to the complex surface and underground geological conditions, the seismic velocity changes in this area, and the horizontal and vertical changes in various geological factors, such as the stratum dip angle and thickness, are large, so the drilling rate of horizontal wells in this area is relatively low. In this paper, the difficulties encountered in horizontal well geosteering in the narrow and steep residual syncline are sorted, and the modelling of velocity, structure, thickness, dip angle and curve was carried out. Combined with the element change law and element imaging technology, the track while drilling horizon was identified step by step to improve the hit target rate and drilling encounter rate. The actual drilling results show that the deviation from the geological design was reduced within 25 meters, the drilling encounter rate of high-quality shale was increased to 99.2%, and the drilling encounter rate of the box was increased to 96.5% from 87.6%. Three wells of them achieved the geosteering achievements of hit rate 100%, high-quality shale encounter rate 100%, and box body encounter rate 100%. In areas similar to the narrow and steep residual syncline geosteering difficulty in the northern Guizhou area, the application of this set of technical countermeasures can avoid subtle structural changes such as small folds in time and effectively ensure the box drilling rate of horizontal wells, which can provides solid technical support for horizontal well geosteering.
- northern Guizhou area /
- Wufeng-Longmaxi formations /
- shale gas /
- narrow and steep syncline /
- geosteering

HTML全文

图 1 黔北地区AC向斜地貌(a)与龙马溪组底界构造示意图(b)

Figure 1. AC syncline landform in northern Guizhou area (a) and the structure map of the Longmaxi Formation bottom boundary (b)

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图 2 黔北A地区水平井靶点钻探误差(a)与时深关系图(b)

Figure 2. Drilling error (a) and time-depth relationship diagram (b) of target point of horizontal well in Qianbei A area

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图 3 黔北A地区X井沿靶点方向三维地震倾角提取示意图(A, B为靶点)

Figure 3. Schematic diagram of 3D seismic dip along the target point direction of Well X in Qianbei A area

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图 4 区域典型井眼轨迹示意图及井眼扩大率与方位伽马曲线对比图(1 in=25.4 mm)

Figure 4. Schematic diagram of regional typical well trajectory and comparison chart of borehole expansion rate and azimuth gamma curve

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图 5 多元模型示意图

Figure 5. Schematic diagram of multivariate model

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图 6 随钻构造模型(a)及速度矫正图(b)

Figure 6. Structural model while drilling (a) and speed correction diagram (b)

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图 7 随钻曲线正演、反演及对比图

Figure 7. While drilling curve forward, inversion and comparison chart

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图 8 X-1井元素成像展示图

Figure 8. Element imaging display diagram of the Well X-1

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