Sedimentary origin of fine-grained rocks in the Permian Lucaogou Formation in the southern Junggar Basin: implications from grain size analysis

Tao, Lianxin; Sun, Pingchang; Xu, Yinbo

doi:10.1007/s40948-022-00475-2

Cited by 2 publications

(5 citation statements)

References 89 publications

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“…And the curve on the right corresponds to a uniform suspension transport mode, which corresponds more to clay deposition (corresponding to the dark bands in Figure ). According to the classification of Tao et al, the lamina types developed in the study area are clastic–clay laminae and clay–clastic laminae, which are mostly developed in shallow lake areas . The clastic and clay-clastic laminae of shallow lake sediments often form a complete combination of bright and dark laminae (Figure ).…”

Section: Resultsmentioning

confidence: 98%

“…The cumulative probability curve in the study area presents an obvious two-stage type, with obvious inflection points (Figure ). The two-segment curves are suspension curves, and the two sides of the fine truncation point represent two transport modes . Among the two segments, the curve on the left has a certain slope, corresponding to graded suspended particles.…”

Section: Resultsmentioning

confidence: 99%

“…The clastic and clay-clastic laminae of shallow lake sediments often form a complete combination of bright and dark laminae (Figure ). This combination of light and dark laminae is formed by the alternation of seasons. − …”

Section: Resultsmentioning

confidence: 99%

“…The two-segment curves are suspension curves, and the two sides of the fine truncation point represent two transport modes. 66 Among the two segments, the curve on the left has a certain slope, corresponding to graded suspended particles. And the curve on the right corresponds to a uniform suspension transport mode, which corresponds more to clay deposition (corresponding to the dark bands in Figure 6).…”

Section: Dla-7mentioning

confidence: 99%

“…According to the classification of Tao et al, the lamina types developed in the study area are clastic−clay laminae and clay− clastic laminae, which are mostly developed in shallow lake areas. 66 The clastic and clay-clastic laminae of shallow lake sediments often form a complete combination of bright and dark laminae (Figure 6). This combination of light and dark laminae is formed by the alternation of seasons.…”

Section: Dla-7mentioning

confidence: 99%

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Section: Resultsmentioning

confidence: 98%

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Characteristics and controlling factors of Lucaogou formation shale reservoir in the northern edge of Bogda Mountain, the Junggar Basin, China

Jia,

Guo,

Wang

et al. 2024

J Petrol Explor Prod Technol

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The practice of oil and gas exploration has confirmed the existence of recoverable shale oil resources in the Permian Lucaogou Formation on the northern edge of the Bogda Mountains. However, previous research on the development characteristics and main controlling factors of shale oil resources in this area is relatively limited. In order to elucidate the development characteristics and principal controlling factors of the shale deposit in the Lucaogou Formation, the characteristics, physical properties, diagenesis, and influencing factors of the shale ore were investigated utilising data derived from outcrop, drilling, seismic, and geochemical analysis. The findings indicate that the shale of the Lucaogou Formation is prevalent and extensive. The deposit’s lithology is predominantly composed of dark grey and grey-black mud shale, interspersed with thin layers of dark grey and grey-black sandy mud shale and dolomite mud shale. The most prevalent minerals are carbonate minerals, followed by feldspar and quartz, with a notable proportion of brittle minerals. The deposit is primarily composed of dissolution pores, bedding fractures, and structural fractures, with a porosity of 1.23–3.26% and permeability of 0.012–0.076 mD, which are characteristic of ultra-low porosity and ultra-low permeability deposits. Among the three deposit types, the sandstone type exhibits the most favourable physical properties, followed by the dolomite type and the shale type, which displays the least favourable properties. The shale of the Lucaogou Formation is currently in the middle diagenetic phase, which is characterised by compaction, cementation (carbonate cementation, mudstone cementation, pebble cementation), and dissolution. The destructive effect of compaction and cementation on the physical properties is counterbalanced by the constructive effect of dissolution. The diagenetic environment has gradually changed from an alkaline environment to a slightly alkaline, slightly acidic stage.

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Sedimentary origin of fine-grained rocks in the Permian Lucaogou Formation in the southern Junggar Basin: implications from grain size analysis

Cited by 2 publications

References 89 publications

Analysis of the Genetic Model of the Extremely Narrow Channel Shallow Water Delta in DL-A Oilfield, Bohai Bay Basin

Analysis of the Genetic Model of the Extremely Narrow Channel Shallow Water Delta in DL-A Oilfield, Bohai Bay Basin

Characteristics and controlling factors of Lucaogou formation shale reservoir in the northern edge of Bogda Mountain, the Junggar Basin, China

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