Quantitative assessment of the effects of zeolite alteration processes on deep clastic reservoirs – A case study of the Jiamuhe Formation in the Shawan Sag, Junggar Basin, China

Zhou, Junjun; Wu, Haiwei; Wang, Jian; Hu, Guoqing; Zhang, Yunfeng; Feng, Jianghua; Li, Yilin

doi:10.1016/j.marpetgeo.2023.106286

Cited by 4 publications

(3 citation statements)

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“…The basin spans approximately 700 km in length from east to west and 370 km in width from north to south, covering an area of approximately 136,000 km 2 . 38 The Junggar Basin can be divided into six first-order tectonic units in the following order: the Southern Overthrust Belt, West Uplift, East Uplift, Central Depression, Luliang Uplift, and Wulungulu Depression (Figure 1A). 37,39 The study area is situated in the northwestern part of the Central Depression, encompassing the Penyijingxi Sag, the Mosuowan Uplift, and the Shawan Sag from north to south.…”

Section: Geological Settingmentioning

confidence: 99%

“…The basin is bordered by Qinggelidi Mountain and Kelameili Mountain in the northeast, Zayibuer Mountain and Halaate Mountain in the northwest, and Yilinheibiergen Mountain and Bogeda Mountain in the south, forming its natural geographical boundaries (Figure A). The basin spans approximately 700 km in length from east to west and 370 km in width from north to south, covering an area of approximately 136,000 km 2 . The Junggar Basin can be divided into six first-order tectonic units in the following order: the Southern Overthrust Belt, West Uplift, East Uplift, Central Depression, Luliang Uplift, and Wulungulu Depression (Figure A). , …”

Section: Geological Settingmentioning

confidence: 99%

“…During the T 2 K depositional period, the study area was dominated by a braided-river delta, and several wells are located in the subfacies of the braided river delta front (Figure B). These geological features have the potential to serve as pathways for the migration of oil and gas, contributing to the formation of hydrocarbon reservoirs. , The siliciclastic rocks dating from the Permian and Triassic periods within the Penyijingxi and Shawan sags represent significant hydrocarbon reservoirs. Permian stratigraphic sequences include the Jiamuhe (P 1 j), Fengcheng (P 1 f), Xiazijie (P 2 x), Xiawuerhe (P 2 w), and Shangwuerhe (P 3 w).…”

Section: Geological Settingmentioning

confidence: 99%

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Origin of Grain-Coating Chlorite and Implications for Reservoir Quality in the Triassic Deep-Buried Volcaniclastic Sandstones, Central Junggar Basin, Northwestern China

Jia,

Zeng,

Guo

et al. 2024

ACS Omega

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The occurrence and genesis of grain-coating chlorite were investigated in order to evaluate the impact of graincoating chlorite on preserving porosity in the deep-buried Triassic Karamay volcaniclastic sandstones based on thin sections, scanning electron microscopy, and an electron probe. Grain-coating chlorite was formed during the eogenesis, originating from the precursor of smectite through the solid-state transformation (SST) mechanism. The hydration and dissolution of unstable, intermediately basic volcanic rock fragments provided essential Fe 2+ and Mg 2+ ions for the formation of grain-coating chlorite. Due to relatively high stability and low susceptibility to dissolution, acidic volcanic rock fragments could not promote chlorite formation but resulted in authigenic quartz and clays as pore-filling cements. This process would destroy reservoir properties. Under high hydraulic conditions, medium-to coarse-grained sandstone experienced saltation transport, creating significant velocity differentials and pressure differentials on grain surfaces. Subsequently, clay grains adhere to the surfaces, forming grain-coating chlorite during diagenesis with good continuity. In contrast, pebbly sandstone undergoes rolling transport, resulting in smaller velocity differentials on grain surfaces. This makes relatively ineffective clay adsorption and leads to discontinuous grain-coating chlorite in subsequent stages. Under weak hydraulic conditions, grains and clay particles in fine-grained sandstone undergo suspended transport, lacking mutual movement and velocity differentials. Clay particles cannot effectively cover particles but instead fill the pores between them. Therefore, continuous grain-coating chlorite is more commonly developed in the medium-to coarse-grained sandstones and is crucial for inhibiting quartz cementation with a coverage rate exceeding 80%. Inadequate coatings fail to inhibit quartz cementation effectively, while excessive coatings may block pore throats. Optimal protection of primary porosity could occur only when graincoating chlorite is moderately developed.

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Section: Geological Settingmentioning

confidence: 99%