Reservoir controlling differences between consequent faults and antithetic faults in slope area outside of source: A case study of the south-central Wenan slope of Jizhong Depression, Bohai Bay Basin, East China

Liu, Junqiao; Wang, Haixue; Lyu, Yanfang; Sun, Tao; Zhang, Mengdi; He, Wei; Sun, Yonghe; Zhang, Tong; Wang, Chao; Lanzhu, Cao

doi:10.1016/s1876-3804(18)30008-9

Cited by 10 publications

(4 citation statements)

References 14 publications

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“…During the migration process, they are blocked by the NNE faults, which are shown on the profile as antithetic faults (the fault trend is opposite to the formation trend) at the boundary of the intensive zone. The sand body is butted with the mudstone of Qingshankou Formation in the hanging wall of the fault, and oil and gas accumulate and form reservoirs in the footwall of the fault [12][13][14] . The well Y20 encountered an industrial oil layer in Fuyu oil layer, and the oil test results showed that the daily oil production could reach 7.7t(Fig 6).…”

Section: Reservoir Forming Characteristics In the Study Areamentioning

confidence: 99%

Control of Fault Intensive Zones on Hydrocarbon Accumulation: a Case Study of Qijia-Gulong Area in Northern Songliao Basin

2024

Proceedings of the International Conference on Industrial Design and Environmental Engineering, IDEE 2023, November 24–26, 2023

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The top surface faults of Quantou Formation in Qijia-Gulong area in northern Songliao basin are widely developed and densely zoned, controlling the deposition and accumulation of Fuyu oil layer. To clarify the control role of fault intensive zones, a combination of plane and section is used to analyze the plane and section characteristics of fault intensive zones, analyze their impact on reservoirs and source rocks, and clarify the reservoir control mode. The results show that: (1) The faults of Fuyu oil layer in Qijia-Gulong area are unevenly distributed and densely zoned, the Western intensive zones are NNE direction, and the eastern intensive zones are NW direction; (2) The western part of the fourth section of Quantou Formation in the study area is in the direction of provenance. The same direction fault promotes the sand body to transport into the basin, and the reverse fault blocks the sand body migration. When the fault trend is the same as the direction of provenance, the sand body is dispersed along the fault strike; (3) Oil and gas migrate to the high part of the structure through the fault sand body transport path. In the west of the study area, oil and gas are accumulated in the footwall of the antithetic fault at the boundary of the fault intensive zone, which in the East are mainly enriched in the "concave uplift" structure formed by inversion.

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Section: Reservoir Forming Characteristics In the Study Areamentioning

confidence: 99%

Control of Fault Intensive Zones on Hydrocarbon Accumulation: a Case Study of Qijia-Gulong Area in Northern Songliao Basin

2024

Proceedings of the International Conference on Industrial Design and Environmental Engineering, IDEE 2023, November 24–26, 2023

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“…In terms of tectonic position, it is located in the north-central Jizhong depression (Fig. 1), which is a Mesozoic-Cenozoic faulted depression developed in the western part of the North China Craton (NCC) (Li et al, 2017;Liu et al, 2018;Zhang et al, 2018;Wang et al, 2021a;Wang et al, 2022) and is a secondary negative tectonic unit within the Bohai Bay Basin (BBB). Starting from the Cangxian uplift to the east, the Xiong'an New Area is bounded by the eastern margin fault on the Taihang Mountains in the west, is adjacent to the Yanshan fold-thrust belt in the north, and extends to the Xingheng uplift to the south (Guo et al, 2020;Wang et al, 2021b;Zhu et al, 2022).…”

Section: Geological Settingmentioning

confidence: 99%

Characteristics, Formation Periods, and Controlling Factors of Tectonic Fractures in Carbonate Geothermal Reservoirs: A Case Study of the Jixianian System in the Xiong'an New Area, China

Zhu

Wang

2023

Acta Geologica Sinica (Eng)

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As typical carbonate geothermal reservoirs with low porosity in North China, the Jixianian System in Xiong'an New Area is the main target for geothermal fluid exploration. This study determined the characteristics, formation periods, and controlling factors of tectonic fractures based on the analyses of outcrops, cores, thin sections, and image logs. The results show that unfilled fractures account for 87.6% and most tectonic fractures are high–angle shear fractures with angles concentrated at 40°–70°. The fracture porosity increases linearly with an increased fracture aperture. Within the same tectonic setting and stress field, lithology and layer thickness are the dominant factors governing the development of tectonic fractures, which are the most developed in dolomites and thin layers. Tectonic fractures were most likely formed in regions near faults or areas with larger stress gradients. The tectonic fractures in carbonate geothermal reservoirs are roughly divided into four sets: NNW–SSE and NNE–SSW oriented “X” conjugated shear fractures formed from the Paleozoic to the pre–Yanshanian Movement; NE–SW–oriented shear fractures formed in episode B of the Yanshanian Movement occurred at early Cretaceous; nearly E–W–oriented tensional fractures formed in the late Yanshanian Movement at the Late Cretaceous to Paleogene, and NEE–SW–oriented shear fractures formed during the Himalayan movement.

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“…Recent exploration results showed that when faults are open, oil and gas are most likely to migrate upward along the fault and move laterally when such a vertical migration is blocked by the caprock. The corresponding layer where the vertical migration occurs is affected by the damage degree of the caprock and fault-sand configuration [30]. Hydrocarbon migration along the fault zone is in the form of 'focusing fluid' in a limited space.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Favourable Hydrocarbon Transport Pathways of the Jiuzhou Fault in Langgu Sag, Bohai Bay Basin

Liu

et al. 2023

Processes

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The Jiuzhou fault in the Langgu Sag of the Bohai Bay Basin is a significant oil-source fault that connects source rocks and reservoirs, and thus it can transport oil and gas during the hydrocarbon accumulation period. The hydrocarbon distribution characteristics along the strike of the Jiuzhou fault differ distinctly, indicating that the transport capacity in different fault segments is also different. In this study, we focused on analyzing the fault development characteristics to accurately predict the location of favorable hydrocarbon transport pathways on the Jiuzhou fault. We found that the zones superimposed by paleo relay ramps developed before hydrocarbon accumulation, active faulting areas during hydrocarbon accumulation, and transport ridges of the fault are favourable along-fault locations for transporting hydrocarbons. Based on this idea and 3D seismic data, we investigated the distribution of the paleo relay ramps of the Jiuzhou fault and the fault activity rate during hydrocarbon accumulation using the maximum throw subtraction method. Then, the burial depth contour was employed to search hydrocarbon transport ridges of the fault and therefore predict the location of favourable hydrocarbon transport pathways of the Jiuzhou fault. The prediction results show that there are totally 4 favorable hydrocarbon transport pathways, where hydrocarbons are more likely to migrate vertically and finally accumulate in the overlying formations. In addition, the pathway locations of the Jiuzhou fault are consistent with the hydrocarbon distribution in the study area, demonstrating that this method is reliable and feasible for predicting the favorable hydrocarbon transport pathways of oil-source faults.

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Reservoir controlling differences between consequent faults and antithetic faults in slope area outside of source: A case study of the south-central Wenan slope of Jizhong Depression, Bohai Bay Basin, East China

Cited by 10 publications

References 14 publications

Control of Fault Intensive Zones on Hydrocarbon Accumulation: a Case Study of Qijia-Gulong Area in Northern Songliao Basin

Control of Fault Intensive Zones on Hydrocarbon Accumulation: a Case Study of Qijia-Gulong Area in Northern Songliao Basin

Characteristics, Formation Periods, and Controlling Factors of Tectonic Fractures in Carbonate Geothermal Reservoirs: A Case Study of the Jixianian System in the Xiong'an New Area, China

Prediction of Favourable Hydrocarbon Transport Pathways of the Jiuzhou Fault in Langgu Sag, Bohai Bay Basin

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