Natural gas accumulation characteristics and great exploration potential of the Middle Permian in the Sichuan Basin

doi:10.13745/j.esf.sf.2022.8.23

Abstract

Abstract:

In recent years porous dolomite reservoirs are drilled in the Middle Permian of the Sichuan Basin, and several high-yield wells with good exploration prospects are obtained. However, the exploration potential of the Middle Permian is still unclear and it is critical to know if it beholds another trillion cubic meter-scale natural gas field in the Sichuan Basin, in addition to the Anyue natural gas field. Through in-depth analysis of the source-rock, sediment and reservoir characteristics as well as accumulation models, we find the Middle Permian possesses superior reservoir-forming characteristics—including high-quality hydrocarbon source rock, porosity reservoir development and good well-sealing conditions—and two source-reservoir configuration types—“self generation-self storage” and “lower generation-upper storage”. The Middle Permian develops massive porous dolomite reservoirs and porous limestone karst reservoirs over a large area, and its reservoir capacity and single-well testing production are equivalent to that of the Dengying Formation in the Anyue natural gas field indicating great exploration potential. We believe the Middle Permian is the main stratum to search for the next giant natural gas field in the Sichuan Basin.

Key words: Sichuan Basin, Middle Permian, accumulation characteristics, exploration potential

CLC Number:

P618.130.2

CHEN Mangjiao, TAN Kaijun, WEN Long, LE Xingfu, YAO Jun. Natural gas accumulation characteristics and great exploration potential of the Middle Permian in the Sichuan Basin[J]. Earth Science Frontiers, 2023, 30(1): 11-19.

Figures/Tables 9

Fig.1 Sedimentary facies map of the Qixia Formation, Sichuan Basin

Fig.2 Two-dimensional time-migrated seismic reflection profile of the Maokou Formation, central-western Sichuan Basin (bottom boundary flattened)

Fig.3 Sedimentary facies map of the 2nd member of the Maokou Formation, Sichuan Basin

Fig.4 Gas accumulation model of Middle Permian of the Sichuan Basin

Table 1 Test production of typical wells in various locations in Middle Permian of the Sichuan Basin

地区	典型代表井	层组	测试产量/10⁴ m³
川西	SY001-X8	栖霞组	174.4
	SYX133	栖霞组	142.51
	SYX131	栖霞组	123.97
	SY001-X3	栖霞组	114.6
	ST1	栖霞组	87.61
	PT1	栖霞组	66.86
	JT1	茅口组	112
川中	NC1	茅口组	44.74
	MX31X1	栖霞组	36.69
	MX42	栖霞组	22.42
	GS18	栖霞组	41.74
蜀南	YJ2	茅口组	58.87
川东	BD3	茅口组	83.2

Fig.5 Well profile of the Qixia Formation in connected wells Shuangtan 12-Shuangtan 8-Shuangtan 3-Shuangtan 1-Shuangyu 001-1

Fig.6 Reservoir characteristics of Middle Permian of the Sichuan Basin

Fig.7 Well profile of the Maokou Formation in connected wells Moxi 39-Moxi 149-Nanchong 1-Jiaotan1-Pengshen 2

Fig.8 Composite diagram showing karst paleogeomorphology, granular beach thickness and syncline distribution in the Middle Permian Maokou Formation, southern Sichuan Basin

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