莺歌海盆地乐东10区新近系黄流组储层天然气充注与超压演化史

doi:10.11743/ogg20220608

Abstract

Abstract:

The abnormal high pressure of the Huangliu Formation reservoir in the Yinggehai Basin is quite common with a pressure coefficient reaching up to 2.3. The development and evolution of overpressure are closely related to natural gas accumulation. This study focuses on the relationship between gas accumulation and reservoir pressure evolution， based on the petrographic observation of fluid inclusions， coupled with the trapping pressure of gas inclusions in the Huangliu Formation reservoir revealed by microscopic temperature measurement of fluid inclusions and Laser Raman spectrometry. The reservoir of Huangliu Formation in Ledong 10 area of Yinggehai Basin develops pure-CO₂ gas inclusions， CH₄-rich gas inclusions， as well as mixed CO₂ and CH₄ gas inclusions， corresponding to CO₂ and hydrocarbon gas charging of two stages respectively. The two-stage CO₂ charging occurred 2.0 Ma and 1.0 Ma ago from now， respectively， and the CO₂ is of inorganic origin as shown by the carbon isotopes in the inclusions. The two-stage hydrocarbon gas charging occurred 1.8 Ma and 0.4 Ma ago from now， later compared with the CO₂ charging. The overpressure of Huangliu Formation reservoir experienced a process of increasing first and then decreasing. From 2.0 Ma to 1.0 Ma， the two-stage CO₂ and one-stage natural gas charging gradually increased the reservoir pressure of the study area. As the second-stage CO₂ charging occurred in the formation， the maximum pressure coefficient reached 2.43. The residual pressure and pressure coefficient in the reservoir during the second-stage hydrocarbon gas charging are lower than the second-stage CO₂ charging， which may indicate that natural gas leak might happen after the second-stage CO₂ charging， which functions to reduce the reservoir pressure around 1.0 Ma to 0.4 Ma. The relationship between natural gas charging and pressure evolution of the Huangliu Formation reservoir in Ledong 10 area of Yinggehai Basin is of great significance to understanding the pattern of natural gas accumulation.

Key words: fluid inclusion, Raman spectrum, paleo-pressure restoration, natural gas charging history, Huangliu Formation, Neogene, Yinggehai Basin

CLC Number:

TE122.3

Caiwei Fan, Aiqun Liu, Yunpeng Wu, Jingxian Hou. Gas charging and overpressure evolution history of the Neogene Huangliu Formation reservoir in Ledong 10 area， Yinggehai Basin[J]. Oil & Gas Geology, 2022, 43(6): 1370-1381.

Figures/Tables 12

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Table 1

Table 2

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序号	井名	深度/m	赋存位置	费米双峰间距 /cm^-1	密度/（g·cm^-3）	同期盐水包裹体均一温度/^oC	捕获压力/MPa	压力系数
1	LD10-A	4 165.8	石英裂隙	104.5	0.72	175.6	62.2	1.48
2	LD10-A	4 165.8	石英裂隙	104.0	0.53	161.4	36.7	1.05
3	LD10-A	4 170.0	石英裂隙	104.5	0.72	177.3	62.8	1.50
4	LD10-A	4 170.0	石英裂隙	104.5	0.72	177.3	62.8	1.50
5	LD10-A	4 170.0	石英裂隙	104.5	0.72	177.3	62.8	1.50
6	LD10-A	4 249.0	石英裂隙	104.9	0.90	175.6	100.6	2.45
7	LD10-A	4 249.0	石英裂隙	104.9	0.90	175.6	100.6	2.45
8	LD10-A	4 249.0	石英裂隙	104.0	0.53	155.3	34.5	1.05
9	LD10-A	4 134.5	石英裂隙	104.5	0.72	177.3	62.8	1.50
10	LD10-A	4 134.5	石英裂隙	103.9	0.47	155.3	29.8	0.90
11	LD10-B	4 039.0	石英裂隙	104.4	0.67	170.8	53.9	1.46
12	LD10-B	4 039.0	石英裂隙	104.0	0.53	158.7	35.7	1.05
13	LD10-B	4 064.8	石英裂隙	104.0	0.53	158.7	35.7	1.05
14	LD10-B	4 064.8	石英裂隙	104.0	0.53	158.7	36.1	1.06

序号	井名	深度/m	赋存位置	CH₄拉曼峰位移/cm^-1	密度/（g·cm^-3）	同期盐水包裹体均一温度/^oC	捕获压力/MPa	压力系数
1	LD10-A	4 170.0	石英裂隙	2 913.02	0.174	165.0	45.56	1.25
2	LD10-A	4 170.0	石英裂隙	2 912.95	0.177	165.0	46.71	1.28
3	LD10-A	4 170.0	石英裂隙	2 913.10	0.171	168.3	44.85	1.22
4	LD10-A	4 170.0	石英裂隙	2 912.99	0.175	168.3	46.59	1.27
5	LD10-A	4 170.0	石英裂隙	2 912.99	0.175	168.3	46.59	1.27
6	LD10-A	4 170.0	石英裂隙	2 912.99	0.175	168.3	46.59	1.27
7	LD10-A	4 249.0	石英裂隙	2 912.99	0.175	168.3	46.59	1.27
8	LD10-A	4 249.0	石英裂隙	2 912.99	0.175	168.3	46.59	1.27
9	LD10-A	4 249.0	石英裂隙	2 912.97	0.176	168.3	46.96	1.28
10	LD10-A	4 249.0	石英裂隙	2 912.99	0.175	168.3	46.63	1.27
11	LD10-A	4 249.0	石英裂隙	2 912.97	0.176	168.3	46.96	1.28
12	LD10-A	4 249.0	石英裂隙	2 912.96	0.177	168.3	47.13	1.28

序号	井名	深度/m	赋存位置	峰面积比	CO₂∶CH₄（百分含量比）		费米双峰间距/ cm^-1	CH₄拉曼峰位移/cm^-1	同期盐水包裹体均一温度/^oC	捕获压力/MPa	古压力系数
序号	井名	深度/m	赋存位置	峰面积比	混合气包裹体	现今气藏	费米双峰间距/ cm^-1	CH₄拉曼峰位移/cm^-1	同期盐水包裹体均一温度/^oC	捕获压力/MPa	古压力系数
1	LD10-A	4 249.0	石英加大边	0.660 9	61.1∶38.9	66.1∶33.9	103.9	2 911.80	181.3	91.5	2.15
2	LD10-A	4 249.0	石英加大边	0.658 7	61.0∶39.0	64.3∶35.7	104.1	2 911.83	181.3	95.6	2.25
3	LD10-A	4 249.0	石英加大边	0.716 7	63.0∶37.0	65.6∶34.4	104.0	2 911.81	181.3	94.3	2.22

井号	深度/m	A^（12）-	A^（12）+	A^（13）-	A^（13）+	A^（13）/A^（12）	F	δ¹³C_CO2	CO₂成因
LD10-A	4 165.8	8 509.638	14 108.990	378.846 3	163.014 0	0.023 956 373	0.466 972 6	-4.469 9	无机成因
LD10-A	4 165.8	5 417.402	9 041.003	215.094 4	131.695 7	0.023 985 364	0.466 972 6	-3.265 2	无机成因
LD10-A	4 170.0	3 207.608	1 080.343	63.572 6	39.251 6	0.023 979 789	0.466 972 6	-3.496 8	无机成因
LD10-B	4 039.0	17 456.410	30 384.380	701.269 1	441.214 6	0.023 880 954	0.466 972 6	-7.604 0	无机成因

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Gas charging and overpressure evolution history of the Neogene Huangliu Formation reservoir in Ledong 10 area， Yinggehai Basin

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