Citation: | GUO Hui, ZHAO Hongge, CHEN Jiangmeng, SHAO Xiaozhou, LIU Chiyang, WANG Jianqiang, LEI Linlin, LI Jun, WANG Jian, HUANG Lei. 2024. Fracture characteristics of Triassic Yanchang Formation in the Gufengzhuang Area, Western Ordos Basin and its control on low permeability reservoirs[J]. Geology in China, 51(1): 73-88. doi: 10.12029/gc20210802002 |
This paper is the result of oil−gas exploration engineering.
The Triassic Yanchang Formation in the Gufengzhuang area of the western Ordos Basin develops low−permeability reservoir with abundant natural fractures, and few investigations have focused on the features of the fractures that are of great significance for the exploration and development of low−permeability reservoirs.
In this paper, by means of fracture identification from the outcrops, cores, imaging logging, scanning electron microscope and fluid inclusion, fault activity and tectonic stress analysis, the fracture characteristics and influence on low permeability reservoirs are studied.
The results show that natural fractures are all developed in each Member of the Yanchang Formation, with Chang 7 being the most developed Member, followed by Chang 8 and Chang 6 Members. The fracture mainly orients in the NEE direction, secondly in the NE direction, and lastly in the NW and NWW directions. Calcite filling and obvious oil migration marks can be seen on the surfaces of the cracks. The development degree of natural fractures is closely related to the thickness of rock layers and intensity of fault activity. Comprehensive analysis of the fluid inclusions in fractures, faults and tectonic activities shows that the formation period of fractures is multi−stage, mainly in the Yanshanian and Himalayan periods.
The development of natural fractures has improved the porosity and permeability and reservoir space of low−permeability reservoirs in the study area, and provided favorable conditions for oil migration, accumulation and enrichment in low−permeability reservoirs. The development degree and formation period of natural fractures affect the reservoir forming and productivity of low−permeability reservoirs.
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Location of the study area and distribution of fracture−related drilling wells
Characteristics of outcrop fractures in the Shigouyi area adjacent to the west of the study area
Characteristics of drilling core fractures of the Yanchang Formation in the Gufengzhuang area
Fracture characteristics of the study area
Characteristics of natural fracture imaging logging in the Yanchang Formation in the Gufengzhuang area
Natural fracture density in each oil members of the Yanchang Formation in the Gufengzhuang area
Fracture occurrence characteristics of the Yanchang Formation in the Gufengzhuang area
Plane distribution characteristics of fractures in the Yanchang Formation in the Gufengzhuang area
Relationship of natural fractures and rock (a) and strata thickness (b) in the Gufengzhuang area
Homogenization temperature of fracture inclusions and burial history of the Yanchang Formation in the Gufengzhuang area
Schematic diagram of tectonic stress and fracture strike of the Yanchang Formation in different periods in the study area
Comprehensive evaluation of fractures in the Chang 6 member of well Y66 in the Gufengzhuang area