Prestack inversion identification of organic reef gas reservoirs of Permian Changxing Formation in Damaoping area, Sichuan Basin, SW China

Zhou, Lu; Zhong, Feiyan; Yan, Jiachen; Zhong, Kexiu; Yong, Wu; Xu, Xihui; Lü, Peng; Zhang, Wenji; Liu, Yi

doi:10.1016/s1876-3804(20)60008-8

Cited by 10 publications

(9 citation statements)

References 11 publications

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“…Despite some high gas production wells, there are still many low-production wells in the deep tight matrix reservoirs. The Permian-Triassic reef-shoal bodies along the platform margins have been described by seismic technologies [21,27,28]. Due to the low resolution of the deep seismic data and the influence of Triassic evaporite, seismic velocity, and thrust-fold belt, there are generally ambiguous images of strike-slip faults from the seismic section.…”

Section: Geological Backgroundmentioning

confidence: 99%

“…All of the much higher gas production wells have penetrated the fracture network, in which almost all the wells have fallen into the fault damage zones. The fractures are characterized by high dip angles along the fault damage zones, and three stages of fracture activities with carbonate cements, asphaltene filling and un-filled fractures in the Yuanba Gasfield [28]. Particularly, the dissolution pores developed well along the fractures.…”

Section: The Distribution Of the Fault Damage Zone And Effect On Carb...mentioning

confidence: 99%

“…Further, dissolution porosity has become more important in the deep subsurface [21,23,26]. The seismic technologies of seismic amplitude attribute, bright spot, and prestack inversion have been used for reservoir description [21,27,28]. Although many techniques have been performed, there are still many low-production wells in the deep tight matrix reservoirs.…”

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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Section: Geological Backgroundmentioning

confidence: 99%

Section: The Distribution Of the Fault Damage Zone And Effect On Carb...mentioning

confidence: 99%

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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“…Platform shoals, including the Changxing Formation, Feixianguan Formation, and Jialingjiang Formation, are also under exploration [10,11]. Additionally, exploration efforts extend to the Middle Permian shoals, encompassing the platform margins and gently sloping shoals of the Qixia Formation in the western and northwest regions of Sichuan [11][12][13][14][15][16]. It is noteworthy that the distribution of strata and reservoirs is largely governed by the sedimentary facies [2,6,[12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Sedimentary Facies, Paleogeography, and Depositional Models of the Middle–Late Permian in the Sichuan Basin, Southwest China

Deng,

Zhao,

Lin

et al. 2023

Minerals

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This study focuses on the analysis of the sedimentary facies of the Middle–Late Permian, including the Qixia, Maokou, Wujiaoping/Longtan, and Changxing/Dalong Formations, in the Sichuan Basin, southwest China. Integrating drilling data and field outcrop data, various sedimentary facies indicators were employed to define eight sedimentary facies types in the Sichuan Basin during the Middle–Late Permian, namely, mixed tidal flat, tidal flat, restricted platform, open platform, platform margin, slope, basin, and volcanic facies. Detailed facies analysis was conducted on selected well logs, and sedimentary facies distribution maps were compiled for different time intervals, establishing depositional models. During the Qixia to Maokou stages, an extensive open platform was developed in the Sichuan Basin, accompanied by shallow intra-platform shoals. Towards the west along the Dayi–Ya’an line, platform margins were developed, followed by slope facies and basin facies in a northwest direction. During the Changxing stage, the Kaijiang–Liangping fault block subsided, forming the “Kaijiang-Liangping” paleochannel, which controls reef–shoal deposition in the region. This study provides comprehensive insights into the sedimentary facies characteristics and depositional environments of the Middle–Late Permian in the Sichuan Basin, contributing to the understanding of the regional sedimentary history and geological evolution.

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“…However, due to the multiple superpositions of seismic data, the sensitive information of reservoir such as amplitude and travel time is lost, which has certain limitations in reservoir and fluid prediction. Compared with poststack seismic inversion, prestack seismic inversion has the advantages of fidelity and multi-information, and its results can more reliably predict the distribution, physical properties, and fluid properties of reservoir [1][2][3][4]. Prestack inversion technology through the continuous research of many scholars, from the early qualitative prediction to the present multiparameter quantitative prediction, provides technical support for the multidirectional quantitative prediction of different reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Prestack Inversion Identification of Dolomite Reservoirs in the Fourth Member of the Sinian Dengying Formation in Moxi Area, Sichuan Basin, SW China

et al. 2021

Self Cite

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The dolomite reservoir of the fourth member of Dengying Formation in Moxi area of Sichuan Basin is thin, is fast in lateral variation, and has P-impedance difference from the surrounding rock; it is difficult to identify and predict the dolomite reservoir and fluid properties by conventional poststack seismic inversion. Through the correlation analysis of core test data and logging P-S-wave velocity, this work proposed a formula to calculate the shear wave velocity in different porosity ranges and solved the issue that some wells in the study area have no S-wave logging data. AVO forward analysis reveals that whether the gas reservoir of dolomite reservoir is located at the top of the fourth member of Dengying Formation is the main factor affecting the variation of AVO type. Through cross-plotting analysis of elastic parameters, it is found that P-S-wave velocity ratio and fluid factor are sensitive parameters to gas-bearing property of dolomite reservoir in the study area. By comparing the inversion results of prestack parameters such as density, P-wave impedance, S-wave impedance, P-S-wave velocity ratio, and fluid factor, it is found that the gas-bearing prediction of dolomite reservoir by using P-S-wave velocity ratio and fluid factor obtained from simultaneous prestack inversion had the highest coincidence rate with actual drilling data. At last, according to the distribution characteristics of fluid factor and P-S-wave velocity ratio, the favorable gas-bearing areas of dolomite reservoir in the fourth member of Dengying Formation in the study area are finely predicted, and the next favorable exploration areas were pointed out.

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Prestack inversion identification of organic reef gas reservoirs of Permian Changxing Formation in Damaoping area, Sichuan Basin, SW China

Cited by 10 publications

References 11 publications

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

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

Sedimentary Facies, Paleogeography, and Depositional Models of the Middle–Late Permian in the Sichuan Basin, Southwest China

Prestack Inversion Identification of Dolomite Reservoirs in the Fourth Member of the Sinian Dengying Formation in Moxi Area, Sichuan Basin, SW China

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