Organic Pore Structures and Origin in the Lower Paleozoic Marine Shales of Jiaoshiba Region of Sichuan Basin, China

He, Chencheng; He, Sheng; Peng, Nyujia

doi:10.1190/ice2015-2210709

Cited by 1 publication

(2 citation statements)

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“…Overall, the general scenario suggested from Fig. 14c is more consistent with the exploration results and is validated by well parameters, where the early shale deposition is richer in the organic matter and graptolite fossils, while the subsequent deposition is composed of gray mudstone and argillaceous siltstone with a generally inferior quality rock (He et al 2015;Yang and He 2015).…”

Section: Field Data Applicationsupporting

confidence: 80%

“…The dashed black line on angle stack 4 indicates the boundary between the shale and the limestone intervals with total thicknesses ranging from 90 to 250 m are producing gas. During the early Silurian, the depositional environment changed from deepwater continental shelf to shallow-water continental shelf, and these shales gave a good quality reservoir that is rich in organic matter and graptolite fossils with an average thickness of 38 m. The subsequent shale depositions (with an average thickness of 170 m) are composed of gray mudstone and argillaceous siltstone with a generally inferior quality (He et al 2015;Yang and He 2015).…”

Section: Field Data Applicationmentioning

confidence: 99%

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Pre-stack seismic density inversion in marine shale reservoirs in the southern Jiaoshiba area, Sichuan Basin, China

et al. 2018

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For a typical marine shale reservoir in the Jiaoshiba area, Sichuan Basin of China, P-impedance is sensitive for identifying lithology but not suitable for indicating good shale reservoirs. In comparison, density is an important quantity, which is sensitive for identifying the organic-rich mud shale from non-organic-rich mud shale. Due to the poor data quality and incidence angle range, density cannot be easily inverted by directly solving the ill-posed pre-stack seismic inversion in this area. Meanwhile, the traditional density regularizations implemented by directly using the more robust P-impedance inversion tend to be inaccurate for recovering density for this shale reservoir. In this paper, we combine the P-impedance and the minus uranium to construct the pseudo-P-impedance (PIp) at well locations. The PIp is observed to be sensitive for identifying organic-rich mud shale and has a good correlation with density in this area. We employ the PIp-density relation into the pre-stack inversion framework to estimate density. Three types of regularization are tested on both numerical and field data: These are no regularization, traditional regularization and the proposed approach. It is observed that the proposed method is better for recovering the density of organic-rich mud shale in the Jiaoshiba area.

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Section: Field Data Applicationsupporting

confidence: 80%

Section: Field Data Applicationmentioning

confidence: 99%