Reef–shoal combinations and reservoir characteristics of the Changxing–Feixianguan Formation in the eastern Kaijiang–Liangping trough, Sichuan Basin, China

Dong, Qingmin; Hu, Zhonggui; Chen, Shiyue; Yuan, Baoguo; Dai, Xiaohu

doi:10.1007/s13146-021-00698-6

Cited by 4 publications

(5 citation statements)

References 15 publications

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“…The oolitic beaches developed in the highstand system tract of the second member in Feixianguan Formation. The oolitic beach reservoir is primarily composed of oolitic limestone and dolostone (Dong et al, 2021), with pore spaces predominantly consisting of intergranular and intercrystalline dissolution pores (Feng et al, 2021). After oil and gas filling, the formation velocity decreases relative to the surrounding rock formations.…”

Section: Seismic Response Of Beachmentioning

confidence: 99%

“…Previous work of drilling and seismic data show that a large number of oolitic beaches developed in the Sichuan Basin (Dong et al, 2021;Pei et al, 2020;Ren et al, 2021), which are the main gas reservoirs of the Triassic Feixianguan Formation. Accurate identification of oolitic beach is important for fine tuning reserve and increasing production of gas in the Sichuan Basin.…”

Section: Introductionmentioning

confidence: 99%

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Seismic oolitic beach identification using a hybrid signed pressure force active contour model in the Northeastern Sichuan Basin, China

Li,

Huang,

Tang

et al. 2024

Preprint

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Oolitic beach in Triassic Feixianguan formation is one of the majority reservoirs in the Northeastern Sichuan Basin. The precise delineation of the oolitic beach distribution using seismic data is important for characterizing the potential of gas reservoirs. Current identification workflow requires manually interpretation using seismic attributes, which is interpreter dependent and labor consuming. We propose an automatic oolitic beach identification method based on Signed Pressure Force Active Contour Model (SPFACM). To corporate with the seismic attributes, we modify SPFACM by adding an extra signed pressure force driven by the automatic threshold constraint and name it hybrid signed pressure force active contour model (HSPFACM). The automatic threshold value is defined by the maximum change of inner region variance, which approximates the outline of oolitic beaches, enhancing the stability and effectiveness of HSPFACM. We test the proposed method using field data in Northeastern Sichuan Basin. The study shows that the most sensitive attribute to characterize oolitic beach is the maximum peak amplitude, and the HSPFACM can effectively identify the oolitic beaches using this attribute. The well log interpretation shows that our identification result agrees with the locations of gas reservoirs. The accuracy of our method outperforms three state of art ACMs. The segmentation result shows that the oolitic beaches predominantly developed within the sea trough, and their occurrence decreases towards the platform margin, which agrees with the geological understanding.

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Section: Seismic Response Of Beachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Seismic oolitic beach identification using a hybrid signed pressure force active contour model in the Northeastern Sichuan Basin, China

Li,

Huang,

Tang

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

“…The Permian-Triassic reef-shoal reservoir is a major exploration and development domain in the Sichuan Basin, SW China [18,19]. Large gas fields in Puguang, Longgang, and Yuanba areas have been discovered in reef-shoal reservoirs along the Kaijiang-Liangping platform margins [19][20][21]. Several studies described the reef-shoal microfacies and reservoirs along the platform margins and proposed a microfacies-controlled reservoir model [18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…Large gas fields in Puguang, Longgang, and Yuanba areas have been discovered in reef-shoal reservoirs along the Kaijiang-Liangping platform margins [19][20][21]. Several studies described the reef-shoal microfacies and reservoirs along the platform margins and proposed a microfacies-controlled reservoir model [18][19][20][21][22][23]. Some studies suggested that dolomitization had an important effect on the reef-shoal reservoir [24,25].…”

Section: Introductionmentioning

confidence: 99%

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Seismic Description of Deep Strike-Slip Fault Damage Zone by Steerable Pyramid Method in the Sichuan Basin, China

Tang¹,

Tang

Luo³

et al. 2022

Energies

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Large quantities of gas resources have been found in the Paleo-Mesozoic carbonate rocks in the Sichuan Basin. However, many wells cannot obtain high production in deep low porosity-permeability reservoirs. For this contribution, we provide a steerable pyramid method for identifying the fault damage zone in the Kaijiang–Liangping platform margin, which is infeasible by conventional seismic methods. The results show that steerable pyramid processing could enhance the seismic fault imaging and a series of NW-trending strike-slip faults are found along the trend of the carbonate platform margin. The steerable pyramid attribute presents distinct vertical and horizontal boundaries of the fault damage zone, and heterogeneous intensity of an un-through-going damage zone. The width of the fault damage zone is generally varied in the range of 100–500 m, and could be increased to more than 1000 m in the fault overlap zone, intersection area, and fault tips. Further, the fault damage zone plays a constructive role in the high gas production in the deep tight carbonate reservoir. The results suggest the steerable pyramid method is favorable for identifying the weak strike-slip faults and their damage zone. The width of the fault damage zone is closely related to fault displacement, and the much wider damage zone is generally influenced by the fault overlapping and interaction. The fractured reservoirs in the fault damage zone could be a new favorable exploitation domain in the Sichuan Basin.

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Effects of Intracratonic Strike‐slip Fault on the Differentiation of Carbonate Microfacies: A Case Study of a Permian Platform Margin in the Sichuan Basin (SW China)

LIU,

WU,

TANG

et al. 2024

Acta Geologica Sinica (Eng)

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In intracratnoic basins, the effect of strike‐slip faults on sedimentary microfacies is generally underestimated due to their small scale. Based on the integration of core, well logs, and three‐dimensional seismic data, this study presents a comprehensive analysis of the Permian carbonate platform and strike‐slip faults in the southwestern Kaijiang‐Liangping trough of the Sichuan Basin. The relationship between strike‐slip faults and Permian carbonate microfacies is investigated. The results reveals the existence of a NW‐trending strike‐slip fault zone along the platform margin, exhibiting clear segmentation. The western side of the study area exhibits a rimmed platform margin characterized by type I reefs, which corresponds to the presence of a large‐scale strike‐slip fault zone. In contrast, the eastern side is characterized by a no‐rimmed and weak rimmed platform margin, accompanied by type II reefs, which align with smaller strike‐slip fault zones. It was found that the strike‐slip fault had some effects on the platform and reef‐shoal complex of the Permain Changxing Formation. First, the platform was divided by strike‐slip fault into three segments to show rimmed, week rimmed and no‐rimmed platform. Second, reef‐shoal complex devolped along the faulted high position in the strike‐slip fault zone, and separated by faulted depression. Third, strike‐slip faults can offset or migrated the reef‐shoal complex and platform margin. Additionally, the thickness of the platform margin varies across strike‐slip fault zone, which is related to the activity of strike‐slip faults. The strike‐slip faults affect the microfacies by controlling the pre‐depositional paleotopography. This case suggests that the strike‐slip faults play a crucial role in the diversity and distribution of carbonate microfacies in the intracratonic basin.

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Reef–shoal combinations and reservoir characteristics of the Changxing–Feixianguan Formation in the eastern Kaijiang–Liangping trough, Sichuan Basin, China

Cited by 4 publications

References 15 publications

Seismic oolitic beach identification using a hybrid signed pressure force active contour model in the Northeastern Sichuan Basin, China

Seismic oolitic beach identification using a hybrid signed pressure force active contour model in the Northeastern Sichuan Basin, China

Seismic Description of Deep Strike-Slip Fault Damage Zone by Steerable Pyramid Method in the Sichuan Basin, China

Effects of Intracratonic Strike‐slip Fault on the Differentiation of Carbonate Microfacies: A Case Study of a Permian Platform Margin in the Sichuan Basin (SW China)

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