Theoretical and technical innovations in strategic discovery of a giant gas field in Cambrian Longwangmiao Formation of central Sichuan paleo-uplift, Sichuan Basin

Du, Jiapei; Zou, Caineng; Xu, Chunchun; He, Hongping; Shen, Ping; Yang, Yueming; Li, Yalin; Wei, Guoqi; Wang, Zecheng; Yang, Yu

doi:10.1016/s1876-3804(14)60035-5

Cited by 167 publications

(43 citation statements)

References 6 publications

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“…They may be thick monolayers or vertically stacked reservoir layers of various types. The formation of high-quality reservoirs is integrated and controlled by many factors, such as the structure, deposition, diagenesis, and fluid (Tucker and Wright 1990;Moore 2001;Lucia 2007;Ma et al 2011;Du et al 2014;He et al 2011bHe et al , 2016. Although the characteristics and formation mechanisms of the highquality reservoirs may be different (Table 3), they have some similarities.…”

Section: Large-scale High-quality Reservoirsmentioning

confidence: 99%

“…The multiperiod tectonic movements resulted in the uplift and erosion of strata, forming large unconformities and providing conditions for the formation of weathering crust karst reservoirs. For example, the multiperiod tectonic movements in the PLP marine strata in the Tarim, Sichuan, East Siberian, and Permian basins produced large-scale karst reservoirs (Postnikova et al 2002;Dutton et al 2005;Kang 2008;Zhang et al 2007b;Luo et al 2008;Liu et al 2010;Zhao et al 2012b;Wang et al 2013b;Zhou 2013;Du et al 2014;Yang et al 2014). S o u t h a n d C e n t r a l O m a n S a lt B a s in E a s t e r n F l a n k Fig.…”

Section: Large-scale High-quality Reservoirsmentioning

confidence: 99%

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Formation and distribution characteristics of Proterozoic–Lower Paleozoic marine giant oil and gas fields worldwide

et al. 2017

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There are rich oil and gas resources in marine carbonate strata worldwide. Although most of the oil and gas reserves discovered so far are mainly distributed in Mesozoic, Cenozoic, and upper Paleozoic strata, oil and gas exploration in the Proterozoic-Lower Paleozoic (PLP) strata-the oldest marine strata-has been very limited. To more clearly understand the oil and gas formation conditions and distributions in the PLP marine carbonate strata, we analyzed and characterized the petroleum geological conditions, oil and gas reservoir types, and their distributions in thirteen giant oil and gas fields worldwide. This study reveals the main factors controlling their formation and distribution. Our analyses show that the source rocks for these giant oil and gas fields are mainly shale with a great abundance of type I-II organic matter and a high thermal evolution extent. The reservoirs are mainly gas reservoirs, and the reservoir rocks are dominated by dolomite. The reservoir types are mainly karst and reef-shoal bodies with well-developed dissolved pores and cavities, intercrystalline pores, and fractures. These reservoirs are highly heterogeneous. The burial depth of the reservoirs is highly variable and somewhat negatively correlated to the porosity. The cap rocks are mainly thick evaporites and shales, with the thickness of the cap rocks positively correlated to the oil and gas reserves. The development of high-quality evaporite cap rock is highly favorable for oil and gas preservation. We identified four hydrocarbon generation models, and that the major source rocks have undergone a long period of burial and thermal evolution and are characterized by early and long periods of hydrocarbon generation. These giant oil and gas fields have diverse types of reservoirs and are mainly distributed in paleo-uplifts, slope zones, and platform margin reef-shoal bodies. The main factors that control their formation and distribution were identified, enabling the prediction of new favorable areas for oil and gas exploration.

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Section: Large-scale High-quality Reservoirsmentioning

confidence: 99%

Section: Large-scale High-quality Reservoirsmentioning

confidence: 99%

Formation and distribution characteristics of Proterozoic–Lower Paleozoic marine giant oil and gas fields worldwide

et al. 2017

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“…Due to the geological factors, such as the structural movement at the timing of reservoir formation, the reservoir conditions, and the later tectonic evolution, the proportions of the concentrated or dispersed liquid hydrocarbons are difficult to determine [52,53]. Wang et al [54] provided two methods to discuss the occurrence of the dispersed liquid hydrocarbons both in Sichuan Basin and in Tarim Basin.…”

Section: Petroleum Outside the Source Rocksmentioning

confidence: 99%

“…Lower Paleozoic marine source rocks of three major Chinese marine basins are all at mature/overmature stages ( value ranges from 2.5% to 3.5%). It is commonly reported that discovery of large gas fields from gas cracked liquid hydrocarbon accumulation (paleo-oil accumulations) under high temperature [52,53]. Asphaltene is a secondary cracking product from the liquid hydrocarbons, and its abundance could be used as an evidence for oil secondary cracking.…”

Section: Contribution Of Liquid Hydrocarbons Outside Sourcementioning

confidence: 99%

“…Because of the contribution of the aggregated paleo-oil reservoirs and dispersed liquid hydrocarbons, the largest single gas field in the Sinian and Cambrian old formations of the Gaoshiti-Moxi area has been formed in the Sichuan Basin, which has been explored for nearly 100 years [52,53]. The proven natural gas reserves in the Longwangmiao Formation of the Moxi area reach 440.38 × 10 9 m 3 , and controlled reserves in the fourth section of the Sinian Dengying Formation amount to 204.29 × 10 9 m 3 , illustrating great potentials for deep gas exploration.…”

Section: Contribution Of Liquid Hydrocarbons Outside Sourcementioning

confidence: 99%

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New Insight into the Kinetics of Deep Liquid Hydrocarbon Cracking and Its Significance

Zhao

Zhang

et al. 2017

Geofluids

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The deep marine natural gas accumulations in China are mainly derived from the cracking of liquid hydrocarbons with different occurrence states. Besides accumulated oil in reservoir, the dispersed liquid hydrocarbon in and outside source also is important source for cracking gas generation or relayed gas generation in deep formations. In this study, nonisothermal gold tube pyrolysis and numerical calculations as well as geochemical analysis were conducted to ascertain the expulsion efficiency of source rocks and the kinetics for oil cracking. By determination of light liquid hydrocarbons and numerical calculations, it is concluded that the residual bitumen or hydrocarbons within source rocks can occupy about 50 wt.% of total oil generated at oil generation peak. This implies that considerable amounts of natural gas can be derived from residual hydrocarbon cracking and contribute significantly to the accumulation of shale gas. Based on pyrolysis experiments and kinetic calculations, we established a model for the cracking of oil and its different components. In addition, a quantitative gas generation model was also established to address the contribution of the cracking of residual oil and expulsed oil for natural gas accumulations in deep formations. These models may provide us with guidance for gas resource evaluation and future gas exploration in deep formations.

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Trace element characterization of bitumen constraints on the hydrocarbon source of the giant gas field in Sichuan Basin, South China

Chen

et al. 2018

Geological Journal

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The exploration of high production, natural gas wells (>10 6 m 3 /d) has been extremely successful in the Gaoshiti and Moxi areas of the Leshan-Longnvsi paleo-uplift, in the west-central Sichuan Basin. This paper focuses on the Sinian and Cambrian reservoirs from the Gaoshiti and Moxi areas, where a dataset of new trace elements in bitumen and potential source rock is reported and where hydrocarbon-source correlation is attempted based on trace elements characteristics of the 12 potential source rocks and 22 bitumen samples. Results show that the bitumen from the three reservoirs can be distinguished from each other using trace element distribution patterns and redox-and provenance-sensitive elemental ratios. Bitumen in the second and fourth members of the Sinian Dengying Formation were derived primarily from the third member of the source rocks of the Dengying Formation, which represents a selfsourced paleo-petroleum system. In contrast, bitumen in the reservoirs of the Cambrian Longwangmiao Formation is derived from the Cambrian Qiongzhusi Formation and third member of Dengying Formation. The trace element method used in this study improves our understanding of the complex hydrocarbon-source relation and confirm the potential target for petroleum exploration in the study area.

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Theoretical and technical innovations in strategic discovery of a giant gas field in Cambrian Longwangmiao Formation of central Sichuan paleo-uplift, Sichuan Basin

Cited by 167 publications

References 6 publications

Formation and distribution characteristics of Proterozoic–Lower Paleozoic marine giant oil and gas fields worldwide

Formation and distribution characteristics of Proterozoic–Lower Paleozoic marine giant oil and gas fields worldwide

New Insight into the Kinetics of Deep Liquid Hydrocarbon Cracking and Its Significance

Trace element characterization of bitumen constraints on the hydrocarbon source of the giant gas field in Sichuan Basin, South China

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