Application of seismic geomorphology to carbonate rocks: A case study of the Cambrian Longwangmiao Formation in the Gaoshiti-Moxi area, Sichuan Basin, China

Tan, Lei; Hong, Liu; Tang, Qingsong; Li, Fēi; Tang, Yula; Liang, Feng; Li, Ming; Liu, Wei

doi:10.1016/j.marpetgeo.2021.104919

Cited by 11 publications

(10 citation statements)

References 24 publications

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“…The Upper Permian Longtan Formation (P3l) is rich in organic shale, which is widely developed in the Sichuan Basin and is a high-quality transitional shale gas reservoir between the sea and land. It can be divided from bottom to top into Section 1 (P3l1) to Section 3 (P3l3) [57][58][59][60]. Among them, the P3l1 section has a thickness of 25-55 meters and is mainly composed of sandstone and siltstone, containing coal seams.…”

Section: Geological Settingmentioning

confidence: 99%

“…Among them, the P3l1 section has a thickness of 25-55 meters and is mainly composed of sandstone and siltstone, containing coal seams. The thickness of the P3l2 section is 25-50 meters, with sandstone as the main layer at the bottom and a thin interlayer of mudstone and coal seam transitioning upwards [57][58][59][60]. A set of sandstone has developed in the middle, and the upper lithology is mainly thick mudstone interbedded with siltstone and coal seam [57][58][59][60].…”

Section: Geological Settingmentioning

confidence: 99%

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Pore Structure and Heterogeneity Characteristics of Coal-Bearing Marine–Continental Transitional Shales from the Longtan Formation in the South Sichuan Basin, China

Zhang,

Lin,

et al. 2024

Minerals

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Marine–continental transitional shale has become a new field for shale gas exploration and development in recent years. Its reservoir characteristics analysis lags significantly behind that of marine shale, which restricts the theoretical research on the accumulation of marine–continental transitional shale and the progress of exploration and development. The shale pore system is complex and has strong heterogeneity, which restricts the fine evaluation and optimization of the reservoir. Based on nitrogen adsorption–desorption experiments, the morphology and structural characteristics of coal-bearing shale pores were analyzed, and then the micro-pore structure heterogeneity was quantitatively characterized based on fractal theory and nitrogen adsorption–desorption data, and the relationship between pore structure parameters and their influence on fractal characteristics were discussed. The hysteresis loop of nitrogen desorption isotherm mainly belongs to type B, indicating ink bottle, flat plate, and slit are the main pore shapes. The pore size distribution curves are left unimodal or multimodal, with the main peak around 4 nm and 20–60 nm. Smaller pores develop a larger specific surface area, resulting in a high value of fractal dimension (2.564 to 2.677). The rougher the pore surface and the larger the specific surface area provide an adequate adsorption site for shale gas adsorption and aggregation. Thus, fractal characteristics conduced to understand the pore structure, heterogeneity, and gas-bearing property of coal-bearing shale.

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Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Pore Structure and Heterogeneity Characteristics of Coal-Bearing Marine–Continental Transitional Shales from the Longtan Formation in the South Sichuan Basin, China

Zhang,

Lin,

et al. 2024

Minerals

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“…Through statistical analysis of reservoir information from substantial drilling wells in the central Sichuan paleo-uplift, using the seismic forward modeling, previous researchers found the downward movement of the top peak was favorable seismic facies for predicting the reservoir of Longwangmiao Formation in the central Sichuan paleo-uplift (Dai et al, 2019;Tan et al, 2020). Based on the above understanding, the predecessors extracted the amplitude attributes of the interlaminar peak and the amplitude attributes of the top trough to predict the reservoir distribution of the Longwangmiao Formation in the central Sichuan paleo-uplift (Dai et al, 2019;Xiao et al, 2014;Tan et al, 2020). In this paper, using the data of the northern slope, the waveform of the high-quality reservoir is obtained by seismic forward modeling, which is similar to the waveform proposed by the predecessors in the central Sichuan paleo-uplift, namely the Waveform-1 corresponding to the high-quality reservoir development in SMLF.…”

Section: Favorable Attributes For Predicting Grain Shoal Reservoirsmentioning

confidence: 99%

“…Owing to the structural features of the paleo-uplift and the difference of micro-topography, the thickness of the Longwangmiao Formation in the northern slope is thinner than that in the core of the paleo-uplift. For example, a discovery made from the well JT1 show a thinner thickness of the Longwangmiao Formation (approximately 80 m), and stronger heterogeneity of the grain shoal reservoirs, when compared to the core of the central Sichuan paleo-uplift (Tan et al, 2020;Dai et al, 2023). It is uncertain whether the seismic re ection (i.e., the strong peak re ection within the Longwangmiao Formation) of the reservoir in the core area of the paleo-uplift could be applied to the northern slope area (Zhang et al, 2016;Dai et al, 2019;Tan et al, 2020;Wang et al, 2021;Yang et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…For example, a discovery made from the well JT1 show a thinner thickness of the Longwangmiao Formation (approximately 80 m), and stronger heterogeneity of the grain shoal reservoirs, when compared to the core of the central Sichuan paleo-uplift (Tan et al, 2020;Dai et al, 2023). It is uncertain whether the seismic re ection (i.e., the strong peak re ection within the Longwangmiao Formation) of the reservoir in the core area of the paleo-uplift could be applied to the northern slope area (Zhang et al, 2016;Dai et al, 2019;Tan et al, 2020;Wang et al, 2021;Yang et al, 2021). As a result, reservoir distribution urgently needs to be studied in the northern slope area.…”

Section: Introductionmentioning

confidence: 99%

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Prediction of grain shoal reservoirs via seismic forward modeling and waveform classification: Application to the northern slope of the central Sichuan uplift, Sichuan Basin, SW China

Lei,

Xu,

et al. 2023

Preprint

Self Cite

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Grain shoals are one of principal reservoir facies of carbonate rocks in the oil and gas exploration domains. With the discovery of oil and gas in the grain shoal reservoirs of Longwangmiao Formation in central Sichuan paleo-uplift, the characteristics and distribution of grain shoal reservoirs are still unclear in the northern slope of the central Sichuan paleo-uplift. Through integrated analysis of wireline logs and high-quality 3D seismic data, combined with seismic forward modeling and waveform classification, reservoir seismic facies, reservoir classification, and reservoir distribution of different grades are investigated. The results show that: (1) Under the thin thickness (i.e., the thickness is around 80 m) of the Longwangmiao Formation, (i) when reservoirs are not developed, the seismic waveform is manifested as a single peak, and the top interface of the Longwangmiao Formation corresponds to 1/8 λ above the single peak. (ii) When a single set of reservoirs is merely developed in the second member of the Longwangmiao Formation (SMLF), the waveform still displays a single peak, and the top peak moves downward. In addition, when multiple sets of reservoirs are developed in the SMLF, the seismic reflections of multiple reservoirs are consistent with those of a single reservoir with the same cumulative thickness. (iii) When the reservoirs are developed in both the first and second members of the Longwangmiao Formation, the single peak exhibits moving downward, whether the reservoir thickness of the SMLF is greater than that of the first member, or the reservoir velocity of the SMLF is lower than that of the first member. (2) Under the thick thickness (i.e., the thickness is approximately 110 m) of the Longwangmiao Formation, (i) when reservoirs are not developed, the waveform of the Longwangmiao Formation exhibits a double peak, and the top interface of the Longwangmiao Formation corresponds to the extreme value of the upper peak. (ii) When a single set of reservoirs or multiple sets of reservoirs are only developed in the SMLF, the Longwangmiao Formation exhibits a single peak, and the top interface of the Longwangmiao Formation corresponds to the trough. (iii) With the reservoir development in both the first and second members of the Longwangmiao Formation, the waveform of the Longwangmiao Formation shows an asymmetric low-frequency peak, whether the reservoir thickness of the SMLF is greater than that of the first member, or the reservoir velocity of the SMLF is lower than that of the first member. (3) Using the waveform classification method, the seismic waveforms corresponding to the Longwangmiao Formation could be summarized into four types, including two types of reservoir waveforms. Two reservoir waveforms are distributed as two strips spread from north to south in the central study area. This paper recommends that the waveform classification method is more refined than amplitude attribute extraction for carbonate reservoir prediction.

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Seismic geomorphology analysis and petroleum geology significance of presalt Jurassic carbonate in the right bank of Amu Darya River

Tang,

Chai,

Wang

et al. 2023

Geoenergy Science and Engineering

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Application of seismic geomorphology to carbonate rocks: A case study of the Cambrian Longwangmiao Formation in the Gaoshiti-Moxi area, Sichuan Basin, China

Cited by 11 publications

References 24 publications

Pore Structure and Heterogeneity Characteristics of Coal-Bearing Marine–Continental Transitional Shales from the Longtan Formation in the South Sichuan Basin, China

Pore Structure and Heterogeneity Characteristics of Coal-Bearing Marine–Continental Transitional Shales from the Longtan Formation in the South Sichuan Basin, China

Prediction of grain shoal reservoirs via seismic forward modeling and waveform classification: Application to the northern slope of the central Sichuan uplift, Sichuan Basin, SW China

Seismic geomorphology analysis and petroleum geology significance of presalt Jurassic carbonate in the right bank of Amu Darya River

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