Petroleum systems of the oldest gas field in China: Neoproterozoic gas pools in the Weiyuan gas field, Sichuan Basin

Wei, Guoqi; Chen, Gengsheng; Du, Shangming; Zhang, Lin; Yang, Wei

doi:10.1016/j.marpetgeo.2008.01.009

Cited by 92 publications

(57 citation statements)

References 2 publications

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“…In the Late Cretaceous, the Upper Yangtze region experienced uplift and erosion, with a denudation of 3000e6000 m (Zhu et al, 2006b;Ma et al, 2008;Wei et al, 2008). At present, the burial depth of the Lower Paleozoic shale varies with locations in the Upper Yangtze region, and is mostly within a range of 2000e7000 m in the Sichuan Basin.…”

Section: Introductionmentioning

confidence: 99%

Modeling free gas content of the Lower Paleozoic shales in the Weiyuan area of the Sichuan Basin, China

Zhou

Xiao

Tian

et al. 2014

Marine and Petroleum Geology

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Section: Introductionmentioning

confidence: 99%

Modeling free gas content of the Lower Paleozoic shales in the Weiyuan area of the Sichuan Basin, China

Zhou

Xiao

Tian

et al. 2014

Marine and Petroleum Geology

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“…However, the thickness isopach of the Qiongzhushi Formation roughly parallels the orientation of the sag, indicating that the maximum thickness of the Qiongzhushi Formation is controlled by the morphology of the sag. Strata located around the intracratonic sag provided most of the hydrocarbons to charge its Late Proterozoic to Lower Cambrian petroleum systems [7,18,38,39].…”

Section: High-quality Source-rock Of Early Cambrian Niutitangmentioning

confidence: 99%

“…Subsequent surface exposure resulted in freshwater karstification and development of intergranular and intragranular dissolution porosity. The lower part of the Lower Cambrian had significant capacity to generate oil/gas, which together with hydrocarbons from the Ediacaran Sinian strata migrated to Early Paleozoic traps [7,37,38]. The critical time periods for hydrocarbons generation, migration, and transformation were the Silurian, which was the initial period for liquid hydrocarbons generation, Late Permian to Late Triassic period for peak hydrocarbon-generation, and the Middle Jurassic to Late Cretaceous interval for hydrocarbon-cracking into gas [7,47].…”

Section: High-quality Reservoir Of Early Cambrian Longwangmiaomentioning

confidence: 99%

“…The Early Cambrian strata paraconformably overlie the Sinian (Ediacaran) rocks. In particular, the Qiongzhushi Formation (or Niutitang Formation) is one of the most important source-rocks (dominated by Type I-kerogen) in the basin, which generated hydrocarbons found in the Upper Sinian and Early Cambrian formations reservoirs [37][38][39]. Recently, another giant gas field has been discovered in coarsely crystalline dolomite facies, in the Cambrian Longwangmiao Formation, with proven gas reserves of 4403.8 × 10 8 m 3 (16.2 tcf).…”

mentioning

confidence: 99%

“…This resulted in most of the upper Silurian, Devonian, and Carboniferous strata being absent across the South China block, in the development of several regional unconformities and an E-W trending Leshan-Longnvshi paleouplift in the Sichuan basin center. These structures significantly influenced the formation of the carbonate reservoirs and hydrocarbon accumulations across the Sichuan basin and its periphery [7,29,38]. Furthermore, those multiphase tectonic movements gave rise to a complicated tectonic evolution and sedimentary history of the basin [42,43].…”

mentioning

confidence: 99%

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The Early Cambrian Mianyang-Changning Intracratonic Sag and Its Control on Petroleum Accumulation in the Sichuan Basin, China

et al. 2017

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The older and deeper hydrocarbon accumulations receive increasing attention across the world, providing more technical and commercial challenges to hydrocarbon exploration. We present a study of an asymmetrical, N-S striking intracratonic sag which developed across the Sichuan basin, south China, from Late Ediacaran to Early Cambrian times. The Mianyang-Changning intracratonic sag is ∼50 km wide, with its steepest part in the basin center. In particular the eastern margin shows its greatest steepness. Five episodes in the evolutions of the sag can be recognized. It begins in the Late Ediacaran with an uplift and erosion correlated to Tongwan movement. Initial extension occurred during the Early Cambrian Maidiping period, when more strata of the Maidiping Formation were deposited across the sag. Subsequently, maximum extension occurred during the Early Cambrian Qiongzhusi period that resulted in 450-1700 m thick Maidiping-Canglangpu Formations being deposited in the sag. Then, the sag disappeared at the Longwangmiao period, as it was infilled by the sediments. The intracratonic sag has significant influence on the development of high-quality reservoirs in the Dengying and Longwangmiao Formations and source-rock of the Niutitang Formation. It thus indicates that a high probability for oil/gas accumulation exists along the intracratonic sag, across the central Sichuan basin.

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Rare earth elements (REEs) geochemistry of Sinian–Cambrian reservoir solid bitumens in Sichuan Basin, SW China: potential application to petroleum exploration

et al. 2015

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In order to evaluate rare earth elements (REEs) as a potential proxy for solid bitumen classification, we employed traditional correlation approaches, such as carbon isotopes and V/(V + Ni) ratios, to infer the source rocks of Sinian-Cambrian reservoir solid bitumens in the Sichuan Basin and analyse solid bitumens for their REE compositions by inductively coupled plasma-mass spectrometry. Our data suggested that Sinian-Cambrian reservoir solid bitumens were primarily sourced from the lower Cambrian shales deposited under anoxic-euxinic conditions. REE and their associated parameters seemed to be more sensitive to classify solid bitumens than traditional correlation approaches. REE concentrations played a dominant role and fractionation degree between light and heavy REE and played a secondary role in solid bitumen classification. REE concentration and pattern in solid bitumens might be controlled by two processes, including inheritance from source rocks and water-rock interaction. The major factor controlling REE concentrations in solid bitumens was the type of organic matter of source rocks. Authigenic minerals in solid bitumens formed by water-rock interaction appeared to have little influence on REE compositions of solid bitumens because of their trace contents. Overall, REE could be used as a novel complementary approach to solid bitumen classification in complicated petroleum systems.

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Petroleum systems of the oldest gas field in China: Neoproterozoic gas pools in the Weiyuan gas field, Sichuan Basin

Cited by 92 publications

References 2 publications

Modeling free gas content of the Lower Paleozoic shales in the Weiyuan area of the Sichuan Basin, China

Modeling free gas content of the Lower Paleozoic shales in the Weiyuan area of the Sichuan Basin, China

The Early Cambrian Mianyang-Changning Intracratonic Sag and Its Control on Petroleum Accumulation in the Sichuan Basin, China

Rare earth elements (REEs) geochemistry of Sinian–Cambrian reservoir solid bitumens in Sichuan Basin, SW China: potential application to petroleum exploration

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