随钻核磁共振测井在南海文昌油田低阻油层流体识别中的应用

骆玉虎; 张恒荣; 汤翟; 吴一雄; 袁伟

doi:10.19509/j.cnki.dzkq.2022.0227

随钻核磁共振测井在南海文昌油田低阻油层流体识别中的应用

doi: 10.19509/j.cnki.dzkq.2022.0227

中海石油(中国)有限公司海南分公司, 海口 570311

基金项目:

中海石油(中国)有限公司重大项目“南海西部油田上产2000万方关键技术研究” CNOOC-KJ135ZDXM38ZJ01ZJ

详细信息

作者简介:
骆玉虎(1988—)，男，工程师，主要从事岩石物理测井解释与评价方面的研究工作。E-mail: luoyh15@cnooc.com.cn

通讯作者:
吴一雄(1989—)，男，工程师，主要从事岩石物理测井解释与评价方面的研究工作。E-mail: wuyx5@cnooc.com.cn

中图分类号: P631
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出版历程
- 收稿日期: 2021-07-21

Application of NMR logging while drilling in fluid identification of low resistivity reservoirs in Wenchang Oilfield, South China Sea

Hainan Branch of CNOOC Ltd., Haikou 570311, China

摘要

摘要:
随钻核磁共振测井在南海文昌油田低阻油层的开发中以安全高效的测井方式提供了孔隙度、渗透率等参数，且在定性识别轻质油层方面发挥了关键作用。为了进一步提升随钻核磁共振测井在文昌油田低阻油层流体识别中的使用价值，从孔隙结构和流体性质2个影响因素出发，提出了T₂谱含油特征指标法并引入纯水谱重构法开展流体定量识别。其中T₂谱含油特征指标法以消除孔隙结构的影响为基础，利用轻质油和水的横向弛豫时间差异提取轻质油真实的拖尾现象达到定量识别流体的目的；水谱重构法则采用球管模型和正态分布模型分别构建束缚水谱和可动水谱，并将两者之和作为纯水谱，通过与实测核磁T₂谱的对比提取流体性质信息，达到识别流体性质的目的，2种方法在文昌油田低阻油层的流体识别中均取得了良好的应用效果，可在低阻油层、水淹层等储层流体的定量识别中发挥显著作用。
- 随钻核磁共振测井 /
- 低阻油层 /
- 含油特征指标 /
- 水谱重构 /
- 流体识别
Abstract:
In the development of low resistivity reservoirs in Wenchang Oilfield of South China Sea, NMR logging while drilling provides porosity, permeability and other parameters in a safe and efficient logging way, and plays a key role in qualitative identification of light oil. In order to further improve the application value of NMR logging while drilling in fluid identification of low resistivity reservoir in Wenchang Oilfield, starting from two influencing factors which is pore structure and fluid properties, T₂ spectrum oil-bearing characteristic index was proposed, and pure water spectrum reconstruction was introduced to carry out fluid quantitative identification. The T₂ spectrum oil-bearing characteristics index method was based on eliminating the influence of pore structure, and by using the transverse relaxation time difference between light oil and water to extract the real tail phenomenon of light oil, so as to achieve the purpose of quantitative identification of fluid.The water spectrum reconstruction method used the spherical tube model and the normal distribution model to construct the bound water spectrum and the movable water spectrum respectively, which the sum of the two spectrum is pure water spectrum. The information of fluid properties is extracted by comparing with the actual measured NMR T₂ spectrum, so as to identify the fluid properties. The two methods have good applications to the fluid identification of low resistivity reservoirs in Wenchang Oilfield.These two methods can play important roles in the quantitative identification of reservoir fluids such as low resistivity reservoirs and water flooded reservoirs.
- NMR logging while drilling(NMR-LWD) /
- low resistivity reservoirs /
- oil-bearing characteristics index /
- water spectrum reconstruction /
- fluid identification

HTML全文

图 1 珠江口盆地构造单元划分及文昌油田位置

Figure 1. Division of tectonic in Pearl River Estuary Basin and location of Wenchang Oilfield

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图 2 随钻核磁共振测井仪器MagTrak示意图

Figure 2. Schematic diagram of NMR-LWD tool MagTrak

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图 3 不同黏度原油的核磁共振横向弛豫(T₂)谱特征示意图

Figure 3. Schematic diagram of transverse relaxation spectra of NMR of crude oils with different viscosity

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图 4 文昌X井随钻核磁共振测井T₂谱油层拖尾现象示意图

Figure 4. Schematic diagram of reservoir tailing in T₂ spectrum of NMR-LWD in Well X of Wenchang

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图 5 文昌Y井T₂谱含油特征指标法识别低阻油层

Figure 5. Identification of low resistivity reservoir by T₂ spectrum oil-bearing characteristic index method in Well Y of Wenchang

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图 6 双峰模型与薄膜模型示意图

Figure 6. Schematic diagrams of bimodal model and thin film model

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图 7 球管模型权重因子函数曲线图

Figure 7. Curve of weight factor function of spherical tube model

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图 8 岩心实测束缚水谱与构建束缚水谱对比效果

Figure 8. Comparison between measured irreducible water spectrum and constructed water spectrum

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图 9 岩心实测饱和水谱与构建饱和水谱对比效果

Figure 9. Comparison between measured saturated water spectrum and constructed saturated water spectrum

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图 10 构建纯水谱与岩心实测谱的几何平均值和孔隙度对比

Figure 10. Comparison of geometic mean value and porosity between constructed spectrum and mearsured spectrum

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图 11 文昌Z井构建水谱法流体识别效果图

Figure 11. Results of fluid identification by constructing water spectrum method in Well Z of Wenchang

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