“…Among them, wells LT1 and LT2 reveal a metamorphic rock reservoir in the basement and have good natural gas shows. The daily gas production rate of the metamorphic rock reservoir in the LT1 well is 1.0 × 10 4 m 3 , and that of the LT2 well is 3.6 × 10 4 m 3 16 , which shows that the basement of the central paleo-uplift belt has good exploration potential and is an important strategic area for hydrocarbon resources in the Songliao Basin 17 . Figure 1 ( a ) Structural map of the top of the basement in the central paleo-uplift zone and the distribution of well locations (modified from Du et al, 20,171); ( b ) basement stratigraphic column of the LT1 well; ( c ) basement stratigraphic column of the LT2 well (This figure was drawn by CorelDRAW Graphics Suite 2019, vision number: 21.3.0.755, url: https://www.corel.com/cn ).…”
Section: Geological Settingmentioning
confidence: 92%
“…The Songliao Basin is an important petroliferous basin in northeastern China that has three major structural sequences: a depression sequence, a faulted sequence, and the basement. A large number of oil fields, represented by the Daqing Changyuan superlarge oilfield, have been discovered in the depression sequence; and a large number of natural gas fields, represented by the Xujiaweizi gas field, have been discovered in the faulted sequence 15 , 16 . However, the exploration level of hydrocarbon resources in the basement of the Songliao Basin is still very low and is still in its infancy.…”
Currently, metamorphic rock is a common target for natural gas exploration, and reservoirs are the key factors restricting natural gas exploration and development in metamorphic rocks. The deep metamorphic rock gas reservoir in the central paleo-uplift of the northern Songliao Basin has good exploration and development potential. In this study, we use a combination of qualitative descriptions and quantitative analysis to comprehensively analyze the pore characteristics of the reservoir and explore the factors controlling the pore characteristics of the metamorphic rock reservoir in the central paleo-uplift belt of the Songliao Basin. The metamorphic rock reservoir in the central paleo-uplift belt contains three types of lithologies: chlorite schist, mica schist and mylonite, each with different protoliths and metamorphic histories. The results of high-pressure mercury intrusion and nitrogen adsorption indicate that the pore size distributions of the schist and mylonite differ. Compared with the mylonite, the schist has larger reservoir space, more heterogeneity, smaller pore size, larger specific surface area and larger adsorbed gas storage capacity. This paper also studies the formation process of the reservoir and divides it into four stages. Finally, this article discusses in detail the factors controlling the microscopic pore characteristics of metamorphic rock reservoirs in the central paleo-uplift belt; the metamorphic rock protolith is the most important controlling factor.
“…Among them, wells LT1 and LT2 reveal a metamorphic rock reservoir in the basement and have good natural gas shows. The daily gas production rate of the metamorphic rock reservoir in the LT1 well is 1.0 × 10 4 m 3 , and that of the LT2 well is 3.6 × 10 4 m 3 16 , which shows that the basement of the central paleo-uplift belt has good exploration potential and is an important strategic area for hydrocarbon resources in the Songliao Basin 17 . Figure 1 ( a ) Structural map of the top of the basement in the central paleo-uplift zone and the distribution of well locations (modified from Du et al, 20,171); ( b ) basement stratigraphic column of the LT1 well; ( c ) basement stratigraphic column of the LT2 well (This figure was drawn by CorelDRAW Graphics Suite 2019, vision number: 21.3.0.755, url: https://www.corel.com/cn ).…”
Section: Geological Settingmentioning
confidence: 92%
“…The Songliao Basin is an important petroliferous basin in northeastern China that has three major structural sequences: a depression sequence, a faulted sequence, and the basement. A large number of oil fields, represented by the Daqing Changyuan superlarge oilfield, have been discovered in the depression sequence; and a large number of natural gas fields, represented by the Xujiaweizi gas field, have been discovered in the faulted sequence 15 , 16 . However, the exploration level of hydrocarbon resources in the basement of the Songliao Basin is still very low and is still in its infancy.…”
Currently, metamorphic rock is a common target for natural gas exploration, and reservoirs are the key factors restricting natural gas exploration and development in metamorphic rocks. The deep metamorphic rock gas reservoir in the central paleo-uplift of the northern Songliao Basin has good exploration and development potential. In this study, we use a combination of qualitative descriptions and quantitative analysis to comprehensively analyze the pore characteristics of the reservoir and explore the factors controlling the pore characteristics of the metamorphic rock reservoir in the central paleo-uplift belt of the Songliao Basin. The metamorphic rock reservoir in the central paleo-uplift belt contains three types of lithologies: chlorite schist, mica schist and mylonite, each with different protoliths and metamorphic histories. The results of high-pressure mercury intrusion and nitrogen adsorption indicate that the pore size distributions of the schist and mylonite differ. Compared with the mylonite, the schist has larger reservoir space, more heterogeneity, smaller pore size, larger specific surface area and larger adsorbed gas storage capacity. This paper also studies the formation process of the reservoir and divides it into four stages. Finally, this article discusses in detail the factors controlling the microscopic pore characteristics of metamorphic rock reservoirs in the central paleo-uplift belt; the metamorphic rock protolith is the most important controlling factor.
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