Relationship Between Paleogene Reservoir Densification and Hydrocarbon Accumulation in the Xihu Depression

Hu, Senqing; Xu, Guoce; Zhao, Lian; Xu, Wang; Cui, Hengyuan; Zhang, Wu; Miao, Qing

doi:10.1007/s11802-021-4569-7

Cited by 1 publication

(2 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It features a petroleum-generating interval in the lower part of the Pinghu Formation and Baoshi Formation, reservoir-seal combinations of interbedded sandstones and mudstones in the middle part, and the migration of oil and gas along faults and stepped passages formed by the sandbodies. The accumulation processes include two stages: the pre-5 Ma Longjing movement and the post-5 Ma Longjing movement [31][32][33][34][35][36][37][38] (Figure 4). The Baoyunting nose is generally located in the accommodation zone margin (also known as the transition zone) between the gentle Wuyunting slope in the north and the steep Tuanjieting slope in the south (Figure 2).…”

Section: Regional Geological Backgroundmentioning

confidence: 99%

“…It features a petroleum-generating interval in the lower part of the Pinghu Formation and Baoshi Formation, reservoir-seal combinations of interbedded sandstones and mudstones in the middle part, and the migration of oil and gas along faults and stepped passages formed by the sandbodies. The accumulation processes include two stages: the pre-5 Ma Longjing movement and the post-5 Ma Longjing movement [31][32][33][34][35][36][37][38] (Figure 4). According to the combined profile and plane morphology of the faults, as well as the stratigraphic occurrence, the Baoyunting area can be divided into five secondary structural units: fault fan (FF), high-belt east-dipping fault slope (HFS), fault saddle (FS), fault horst (FH), and low-belt east-dipping fault slope (LFS) (Figure 3).…”

Section: Regional Geological Backgroundmentioning

confidence: 99%

See 1 more Smart Citation

Controls of the Sandbody Scale and Fault Throw on the Lithology and Composite Reservoir Formation in the Baoyunting Slope, East China Sea

Yan,

Zhou,

et al. 2023

Energies

View full text Add to dashboard Cite

Under the conditions of many faults, sandbodies, and hydrocarbon sources on the slopes of faulted basins where structural traps are scarce, only a few sandbodies are capable of forming hydrocarbon pools, while most sandbodies act as aquifers. This situation presents a challenge for predicting favorable hydrocarbon accumulation areas and understanding controlling factors. The Pinghu Formation reservoirs in the Baoyunting nose structure of the Xihu Sag in the East China Sea exemplify this characteristic. Among the 19 small-scale oil and gas reservoirs discovered in this area, 10 are faulted sandbody composite traps and 9 are lithological traps, while the majority of the remaining sand layers, especially the thick layers, act as aquifers, resulting in significantly lower accumulation probabilities compared to the adjacent northern and southern areas. We analyzed the relationship between the sandstone thickness and the amplitude through the 1-D forward modeling of wells and dissected the 3-D seismic event to obtain the planar distribution of a single sandbody. Further comprehensive research on fault sealing and kinetic reservoir formation processes suggests that the gas pool formation in this area is closely related to fault sealing and lateral oil and gas transport. A small fault-to-caprock ratio is beneficial for the sealing of mudstone caprocks, while a large fault-to-sand thickness ratio is beneficial for the lateral sealing of faults and the formation of fault–sand composite pools. The tidal microfacies sandbody has a small scale, poor lateral transport ability, and a low probability of gas reservoir formation. The barrier and delta front sandbodies have a large scale, good lateral transport, and a high probability of reservoir formation. Based on the above methods, favorable pool formation traps were identified in the area, and high-yield gas wells were drilled.

show abstract

Section: Regional Geological Backgroundmentioning

confidence: 99%

“…It features a petroleum-generating interval in the lower part of the Pinghu Formation and Baoshi Formation, reservoir-seal combinations of interbedded sandstones and mudstones in the middle part, and the migration of oil and gas along faults and stepped passages formed by the sandbodies. The accumulation processes include two stages: the pre-5 Ma Longjing movement and the post-5 Ma Longjing movement [31][32][33][34][35][36][37][38] (Figure 4). According to the combined profile and plane morphology of the faults, as well as the stratigraphic occurrence, the Baoyunting area can be divided into five secondary structural units: fault fan (FF), high-belt east-dipping fault slope (HFS), fault saddle (FS), fault horst (FH), and low-belt east-dipping fault slope (LFS) (Figure 3).…”

Section: Regional Geological Backgroundmentioning

confidence: 99%

Controls of the Sandbody Scale and Fault Throw on the Lithology and Composite Reservoir Formation in the Baoyunting Slope, East China Sea

Yan,

Zhou,

et al. 2023

Energies

View full text Add to dashboard Cite

show abstract

Relationship Between Paleogene Reservoir Densification and Hydrocarbon Accumulation in the Xihu Depression

Cited by 1 publication

References 13 publications

Controls of the Sandbody Scale and Fault Throw on the Lithology and Composite Reservoir Formation in the Baoyunting Slope, East China Sea

Controls of the Sandbody Scale and Fault Throw on the Lithology and Composite Reservoir Formation in the Baoyunting Slope, East China Sea

Contact Info

Product

Resources

About