Identification Method of Marine Shale Gas 'High-Quality Layer' in the Lower Paleozoic Area, Southern China and Its Application

Ming-na GE; Shou-mai REN; Tian-xu GUO; Sheng-jian WANG; Zhi ZHOU

doi:10.15898/j.cnki.11-2131/td.201910210148

2020 Vol. 39, No. 3

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Article navigation > Rock and Mineral Analysis > 2020 > 39(3): 350-361

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Ming-na GE, Shou-mai REN, Tian-xu GUO, Sheng-jian WANG, Zhi ZHOU. Identification Method of Marine Shale Gas 'High-Quality Layer' in the Lower Paleozoic Area, Southern China and Its Application[J]. Rock and Mineral Analysis, 2020, 39(3): 350-361. doi: 10.15898/j.cnki.11-2131/td.201910210148

Citation:

Ming-na GE, Shou-mai REN, Tian-xu GUO, Sheng-jian WANG, Zhi ZHOU. Identification Method of Marine Shale Gas 'High-Quality Layer' in the Lower Paleozoic Area, Southern China and Its Application[J]. Rock and Mineral Analysis, 2020, 39(3): 350-361. doi: 10.15898/j.cnki.11-2131/td.201910210148

Identification Method of Marine Shale Gas 'High-Quality Layer' in the Lower Paleozoic Area, Southern China and Its Application

1.
Oil & Gas Survey Center, China Geological Survey, Beijing 100083, China
2.
Development Research Center of China Geological Survey, Beijing 100037, China

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Corresponding author: Shou-mai REN, realshaw@vip.sina.com

Received Date: 21 October 2019

Revised Date: 16 January 2020

Accepted Date: 20 April 2020

Abstract

Abstract

BACKGROUND'High-quality layer' is the focus and hotspot of shale gas exploration and development. Many explorations and important developments have been studied by researchers at home and abroad. However, the threshold of selection parameters, qualitative-quantitative system classification evaluation and template establishment need to be optimized. OBJECTIVESTo identify the 'high-quality layer' and optimize areas of marine shale gas with the commercial value in the Lower Paleozoic area of southern China. METHODSThe Ordovician Wufeng Formation-Lower Silurian Longmaxi Formation and Cambrian Niutitang Formation were the research objects. The identification factors of shale gas enrichment and high-yield 'high quality layer', and the shale gas area with commercial exploration value in the Lower Paleozoic marine facies in southern China were analyzed. RESULTSThree qualitative parameters including sedimentary facies, tectonic preservation, lithologic combination, and eight quantitative parameters including gas content, pressure coefficient, organic carbon content, organic matter maturity, porosity, brittleness, effective thickness, buried depth were optimized. A discriminating principle of qualitative parameters to delineate favorable areas, and quantitative parameters to identify the 'high-quality layer' was proposed. On the basis of this, the parameter acquisition methods and thresholds were analyzed. A 'high-quality layer' quantitative identification template for marine shale gas of the Wufeng-Longmaxi Formation and the Niutitang Formation was established in southern China. This method was applied to the Zheng'an-Wuchuan area of Guizhou Province. Seven favorable shale gas areas and one 'high-quality layer' of shale gas (the Wufeng-Longmaxi Formation of Anchang syncline) were identified, which successfully verified by later drilling. CONCLUSIONSThe proposed method has certain reference significance for the identification of 'high-quality layer' of marine shale gas in southern China.
- shale gas /
- high-quality layer /
- qualitative-quantitative parameters /
- the Wufeng-Longmaxi Formation /
- the Niutitang Formation

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References

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