优质页岩气储层测井特征分析

doi:10.13809/j.cnki.cn32-1825/te.2022.03.006

摘要/Abstract

摘要：

不同产能页岩气井,其储层测井响应特征存在明显差异。通过对比分析不同产能页岩气井测井曲线响应特征,进而总结高产页岩气储层的测井响应特征。分析不同产能页岩气井在岩性、电性、物性、地应力和孔隙压力等方面的差异,利用电阻率测井、放射性测井和声波扫描等地球物理测井信息,围绕有机质品质和地层压力等反映页岩气产能的关键参数,形成了一套基于测井综合响应特征的优质高产页岩储层识别方法。结果表明,优质高产页岩储层电性特征表现为高伽马、低密度、低中子、高声波时差和中高电阻率等特征,纵、横波时差交会图显示地层呈高压特征,该套分析方法能够准确判别页岩储层勘探开发潜力。通过川东南不同页岩气区块不同类型页岩气层现场试气结果与测井综合分析判定结果对比表明,该套判别方法符合率高,可以为页岩气井后期完井方案决策提供科学依据。

关键词: 页岩气, 有机碳, 含气量, 地应力, 地层压力, 电阻率

Abstract:

The logging response characteristics of different productivity shale gas wells are obviously different. By comparing and analyzing the logging response characteristics of shale gas well with different productivity, the logging response characteristics of high production shale gas reservoir are summarized. Then, by the analyses of the differences of lithology, electrical properties, physical properties, in-situ stress and pore pressure in shale gas wells with different productivity, and the geophysics logging information such as resistivity logging, radioactive logging and acoustic scanning, etc., a set of high-quality and high-yield shale reservoir identification methods based on integrated logging response characteristics is developed by considering the key parameters of organic quality and formation pressure to reflect shale gas productivity. The results show that the electrical characteristics of high-quality and high-yield shale reservoirs are high gamma-ray, low density, low neutron, high acoustic time difference and medium-high resistivity. This set of analysis method can accurately identify the exploration and development potential of shale reservoirs. The comparison between the field gas test results of different types of shale gas reservoirs in different shale gas blocks in southeastern Sichuan and the results of comprehensive well logging analysis shows that the method has a high coincidence rate. It can provide scientific basis for later completion plan decision of shale gas well.

Key words: shale gas, organic carbon, gas content, rock mechanics, formation pressure, resistivity

中图分类号:

TE132

马林,蒋夏妮,龚劲松. 优质页岩气储层测井特征分析[J]. 油气藏评价与开发, 2022, 12(3): 445-454.

MA Lin,JIANG Xiani,GONG Jinsong. Analysis of logging characteristics of high quality shale gas reservoirs[J]. Reservoir Evaluation and Development, 2022, 12(3): 445-454.

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井名	普通页岩纵横波时差交会斜率	含气页岩纵横波时差交会斜率	计算地层压力系数	实测地层压力系数	相对误差（%）
S1	0.036 97	0.027 64	1.34	1.66	19.2
J3	0.036 52	0.025 90	1.41	1.35	4.5
J4	0.037 33	0.030 71	1.22	1.12	8.9
J5	0.034 64	0.028 86	1.20	1.15	4.3
L1	0.042 58	0.038 35	1.11	1.08	2.8
P1	0.037 81	0.036 45	1.04	0.98	6.1

井名	最大水平主应力（MPa）	最小水平主应力（MPa）	应力差异系数（%）	压力类型
P1	57	39	46.2	常压
L1	67	51	31.4	常压
L2	61	46	32.6	常压
L3	71	57	24.6	常压
J3	52	45	15.6	超压
J1	84	77	9.1	超压
J4	75	68	10.3	超压
J5	63	54	16.7	超压
S1	81	72	12.5	超压
S2	72	66	9.1	超压