随钻脉冲中子-伽马密度测井响应数值模拟

张锋; 袁超; 刘军涛; 贾岩

doi:10.3799/dqkx.2013.110

随钻脉冲中子-伽马密度测井响应数值模拟

doi: 10.3799/dqkx.2013.110

张锋^{1, 2,},
袁超³,
刘军涛¹,
贾岩⁴

1.
中国石油大学地球科学与技术学院，山东青岛 266580
2.
新疆油田分公司勘探开发研究院，新疆克拉玛依 834000
3.
中国石油勘探开发研究院，北京 100083
4.
中国石油大港油田测试公司，天津 300280

基金项目:

国家自然科学基金 40784065

国家重大油气专项 2011ZX0520-002

国家重大油气专项 2011ZX05009-003

山东省自然科学基金 ZR2012DM002

中石油创新基金 2012D-5006-0302

中央高校基本科研业务费专项资金 10CX03001A

详细信息

作者简介:
张锋(1970-)，男，教授，博士，从事核测井方法、核测井数据处理及蒙特卡罗模拟研究.E-mail: zhfxy_cn@upc.edu.cn

中图分类号: P631
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出版历程
- 收稿日期: 2012-10-10
- 刊出日期: 2013-09-15

Numerical Simulation on Pulsed Neutron-Gamma Ray Density Logging Response in Logging while Drilling

ZHANG Feng^{1, 2
,},
YUAN Chao³,
LIU Jun-tao¹,
JIA Yan⁴

1.
School of Geosciences, China University of Petroleum, Qingdao 266580, China
2.
Research Institute of Petroleum Exploration and Development, Xinjiang Oilfield Company, Kelamay 834000, China
3.
Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
4.
Well Testing Company of Dagang Oilfield, PetroChina, Tianjin 300280, China

摘要

摘要: 随钻过程中采用D-T可控中子源和2个NaI晶体探测器系统，记录两个探测器的非弹性散射和俘获伽马射线，采用俘获伽马计数比值进行含氢指数校正后，建立非弹性散射伽马计数比和地层密度的响应关系，从而实现脉冲中子-伽马密度测井.利用蒙特卡罗方法模拟地层条件下非弹性散射和俘获伽马分布，得到非弹伽马计数与地层密度和含氢指数都有关，但近、远探测器俘获伽马计数比反映含氢指数灵敏度高，利用其对含氢指数校正后就可以得到非弹伽马计数与地层密度的关系；通过二元回归方法得出地层密度校正后的响应公式，校正后视密度和真密度值相差很小.研究结果表明，在随钻过程中利用脉冲中子伽马测井方法可以确定地层密度.
- 随钻测井 /
- 脉冲中子 /
- 伽马射线 /
- 地层密度 /
- 蒙特卡罗模拟 /
- 数值模拟
Abstract: The inelastic and capture gamma ray at different spacing can be recorded with the system of D-T pulsed neutron source and two NaI crystal detectors. The response of inelastic gamma ray counting ratio from near and far detectors and formation density can be obtained after hydrogen index was corrected by the capture gamma ray counts ratio. As a result, the formation density can be measured with pulsed neutron-gamma logging method. The distributions of inelastic and capture gamma ray under different formation conditions are simulated using Monte Carlo method, and then the inelastic gamma ray counting is related to formation density and hydrogen index. Owing to the higher sensitivity of capture gamma ray reflecting to hydrogen index than inelastic gamma ray, the response of formation density and the inelastic gamma ray counting ratio from near and far detectors is founded, which hydrogen index is corrected by capture gamma ray counting. In addition, the binary regression method is utilized to get the density response formula, with which the apparent density after correction is very close to the real one. It is concluded that the formation density can be determined by pulsed neutron gamma logging method while drilling.
- logging while drilling /
- pulsed neutron /
- gamma rays /
- formation density /
- Monte Carlo simulation /
- numerical simulation

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图 1 蒙特卡罗计算模型

Fig. 1. MCNP calculation model

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图 2 近、远探测器非弹、俘获伽马射线计数比值与地层密度关系

Fig. 2. Relationship between formation density and near-far detector's inelastic, captured gamma ratio

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图 3 近、远探测器非弹、俘获伽马射线计数比值与含氢指数关系

Fig. 3. Relationship between HI and near-far detector's gamma ratio

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图 4 含氢指数对地层密度的影响

Fig. 4. HI influence on formation density

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表 1 含氢指数校正前后的对比

Table 1. Comparison before and after hydrogen index correction

地层密度(g/cm³)	校正前视密度(g/cm³)	校正前相对误差(%)	校正后视密度(g/cm³)	校正后相对误差(%)
1.023 6	1.357 3	32.610	1.057 1	-3.280
1.402 6	1.670 3	19.090	1.400 5	0.150
1.516 7	1.767 2	16.520	1.523 0	-0.420
1.653 3	1.876 9	13.520	1.661 5	-0.500
1.714 5	1.909 2	11.360	1.701 2	0.770
1.836 8	2.034 6	10.770	1.870 8	-1.850
1.902 5	2.065 4	8.560	1.910 8	-0.440
2.036 0	2.123 5	4.300	2.014 9	1.040
2.135 7	2.187 9	2.450	2.106 2	1.380
2.240 7	2.277 2	1.630	2.252 4	-0.520
2.402 5	2.341 0	-2.560	2.391 6	0.460
2.485 0	2.348 0	-5.510	2.434 1	2.050
2.518 0	2.407 0	4.400	2.502 0	0.617
2.567 5	2.435 0	5.253	2.560 0	0.304
2.600 5	2.449 0	5.812	2.597 0	0.139
2.633 5	2.466 0	6.364	2.635 0	-0.041
注：ρ_a为视密度；ρ为真密度；(ρ_a-ρ)/ρ为相对误差.

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