Geophysical Evaluation Technology for Shale Gas Reservoir: A Case Study in Silurian of Changning Area in Sichuan Basin

Huang, Tianjun; Xie, Bing; Ran, Qi; Dingyong, Zou; Zhong, Guanghai

doi:10.1260/0144-5987.33.3.419

Cited by 11 publications

(5 citation statements)

References 3 publications

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“…Many studies have probed the response of various minerals to geophysical testing methods (Ersoy, 1995;Goktan and Yilmaz, 2005;Yagiz, 2009;Slatt, 2011;Huang et al, 2015;Sanuade et al, 2017). Huang et al (2007) and Fan et al (2015) calculated the mineral content of shale gas reservoirs with the aid of natural gamma ray logging data, uncovering the close relationship of various minerals and radioactive elements.…”

Section: Sedimentary Environment and Bulk Mineralogymentioning

confidence: 99%

Shale Gas Reservoir Evaluation by Geophysical Measurements: A Case Study of the Upper Ordovician–Lower Silurian in the Fenggang Block, Northern Guizhou Province

Xia

Guo

et al. 2021

Acta Geologica Sinica (Eng)

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With the aid of geophysical measurements, including seventeen two‐dimensional (2D) seismic lines and the well logging curves of well FGY1, the structure and reservoir characteristics of the Upper Ordovician–Lower Silurian strata in the Fenggang block, northern Guizhou Province, were analyzed thoroughly to identify desert areas and favorable intervals. The results show that Longmaxi‐Wufeng is the most prospect‐rich formation, consisting of a thick succession of overmature black shale, this formation remaining partially in the Suiyang, Fenggang and Jianchaxi synclines. The Longmaxi‐Wufeng shale, especially the lower member, was deposited in a reducing low‐energy environment with relatively high U content and a low Th/U value. In this shale, the organic matter type (sapropelic and humic‐sapropelic), total organic carbon (TOC) content, gas content, gas adsorption capacity, vitrinite reflectance and brittle mineral content are profitable for shale gas preservation and development. The fractures of this shale were closed because of its high overburden pressure. The gas adsorption capacity of this shale increases with increasing TOC content and Ro. In the Longmaxi‐Wufeng Formation at well FGY1, the most favorable intervals are in the depth ranges of 2312.4–2325.1 m and 2325.8–2331.1 m.

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Section: Sedimentary Environment and Bulk Mineralogymentioning

confidence: 99%

Shale Gas Reservoir Evaluation by Geophysical Measurements: A Case Study of the Upper Ordovician–Lower Silurian in the Fenggang Block, Northern Guizhou Province

Xia

Guo

et al. 2021

Acta Geologica Sinica (Eng)

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“…Exploration in the basin has greatly promoted the development of shale gas in China. Several commercial shale gas fields, including Fuling, Weirong, Changning, Zhaotong, and Taiyang, have been established and contribute significantly to increasing natural gas production in China. − …”

Section: Introductionmentioning

confidence: 99%

Advances on the Mechanism of Reservoir Forming and Gas Accumulation of the Longmaxi Formation Shale in Sichuan Basin, China

et al. 2021

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Shale gas has become one of the most important natural gas resources. The Sichuan Basin in China is one of the main shale gas production areas and has entered large-scale commercial development. The mechanism of shale gas accumulation is an important scientific problem in shale gas exploration. This work systematically summarizes the understanding of shale gas accumulation in terms of shale gas generation mechanisms, pore evolution mechanisms, gas migration mechanisms, and gas accumulation models. This work reviews the formation process of methane in shale and clarifies that the causes of methane formation vary according to the evolutionary stage. The formation and evolution of organic pores and mineral pores in shale are analyzed using a thermal simulation; the organic pore content is found to vary significantly with evolutionary stage. In addition, this work focuses on an analysis of the migration mechanism of shale gas, discussing the impacts of shale anisotropy, self-sealing, porosity and permeability, various forces, and pathway availability on shale gas migration. In addition to the actual gas content of the shale gas reservoir, shale gas accumulation is analyzed using mathematical and evolutionary models, and the accumulation process is revealed. This work provides important guidelines for shale gas exploration in the Sichuan Basin, which has undergone complex tectonic evolution.

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“…Increasing the rock-breaking efficiency of geophysical drill-bits can improve the petroleum exploration efficiency in mountainous and hilly areas in a certain sense. 1 − 5 …”

Section: Introductionmentioning

confidence: 99%

Research on variation law of geophysical drill-bit downhole flow field under the interaction of multiple hydraulic factors

et al. 2021

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Mountain geophysical prospecting operations play an important role in the entire petroleum exploration field. Geophysical drill-bit is the main tool for mountain geophysical prospecting operations. Its hydraulic structure directly affects the downhole flow field and then affects the chip removal efficiency and drilling efficiency of the bit. At present, most of the scholars’ research is focused on Poly Diamond Crystalline bit, roller bit, etc., and the research on geophysical drill-bit is less, and most of them study the downhole flow field based on the change of single hydraulic structure. The primary objective of this research is to study the variation law of the downhole flow field under the interaction of multiple hydraulic structure factors. The drilling time and cuttings size of two geophysical drill-bits with different hydraulic structures are compared, and the key hydraulic structure factors are selected for analysis. Using numerical simulation software, take different levels of key hydraulic structure parameters and carry out orthogonal experiments. Under the interaction of various factors, study the flow field distribution in the flow channel, the downhole, and the annulus area of the shaft lining. The hydraulic structure of the geophysical drill-bit is closely related to the drilling speed and chip removal efficiency. When multiple hydraulic factors are changed, the diameter of the flow channel is the best when it is 10–12.5 mm, the inclination of the flow channel should be set as close as possible to the center of the downhole, and the length of the chip groove increases, the movement of cuttings is more stable. Variation law of downhole flow field under the interaction of multiple hydraulic factors is studied. This study provides a basis for the hydraulic structure design and optimization of the geophysical drill-bit.

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Geophysical Evaluation Technology for Shale Gas Reservoir: A Case Study in Silurian of Changning Area in Sichuan Basin

Cited by 11 publications

References 3 publications

Shale Gas Reservoir Evaluation by Geophysical Measurements: A Case Study of the Upper Ordovician–Lower Silurian in the Fenggang Block, Northern Guizhou Province

Shale Gas Reservoir Evaluation by Geophysical Measurements: A Case Study of the Upper Ordovician–Lower Silurian in the Fenggang Block, Northern Guizhou Province

Advances on the Mechanism of Reservoir Forming and Gas Accumulation of the Longmaxi Formation Shale in Sichuan Basin, China

Research on variation law of geophysical drill-bit downhole flow field under the interaction of multiple hydraulic factors

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