Distribution characteristics, exploration &amp;amp; development, geological theories research progress and exploration directions of shale gas in China

Li, Shizhen; Zhou, Zijie; Nie, Haikuan; Zhang, Lei-fu; Song, Teng Siow; Liu, Weibin; Li, Hao-han; Xu, Qiuchen; Wei, Siyu; Tao, Shu

doi:10.31035/cg2021069

Cited by 19 publications

(23 citation statements)

References 2 publications

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“…It is worth noting that 90% of the production came from shallow overpressured shale gas reservoirs (pressure coefficient > 1.2) (Fuling, Changning, and Weiyuan), while the production from deep overpressured shale gas fields (pressure coefficient of 1.2–2.5) (Dingshan, Weirong, Yongchuan, and Luzhou) and shallow normally pressured shale gas fields (pressure coefficient generally < 1.2) (i.e., Wulong and Taiyang) accounted for less than 10%. At present, the shallow shale gas reservoirs (depth of 2500–3500 m) are in the process of commercial development and being explored extensively. , Here, deep and normally pressured shale gas reservoirs, as two important resource succession types, are the focus of shale gas exploration in both China and the United States of America (USA).…”

Section: Introductionmentioning

confidence: 99%

“…At present, the shallow shale gas reservoirs (depth of 2500−3500 m) are in the process of commercial development and being explored extensively. 8,9 Here, deep and normally pressured shale gas reservoirs, as two important resource succession types, are the focus of shale gas exploration in both China and the United States of America (USA).…”

Section: Introductionmentioning

confidence: 99%

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Evolution History of Overpressured and Normally Pressured Shale Gas Reservoirs in Wufeng Formation–Longmaxi Formation, Sichuan Basin, China: An Analysis from the Perspective of Source and Seal Coupling Mechanism

Jin

Nie

2022

Energy Fuels

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Among the shale gas fields in the Sichuan Basin, the Fuling, Changning, and Weiyuan fields with Wufeng Formation-Longmaxi Formation as the target formation have made significant contributions to the shale gas industry in China. However, several other areas in the basin which have witnessed gas flow from wildcat wells have not realized commercial development. In this study, we analyzed the Wufeng Formation–Longmaxi Formation shale gas reservoirs from the perspective of a coupling mechanism of source and seal, by considering three aspects, including the characteristics of source and cap rocks, evolution history of the source rock–reservoir caprock, and the differential enrichment of shale gas. The results indicate the following: (1) The occurrence of the regional caprock (Triassic gypsum-salt) determines the distribution of overpressured and normally pressured shale gas reservoirs. In addition, the erosion of the caprock and its integrity control the gas content and cost-efficiency of the normally pressured shale gas reservoirs. (2) For the overpressured reservoirs, the thickness of the siliceous and carbonate-bearing siliceous shales in the WF2-LM4 graptolite zone determines the gas content and producibility of the lower shale gas layer. In terms of the upper layers, the structural form plays a critical role. Generally, gas reservoirs in the upper layers that occupy the higher part of an anticline are more favorable, whereas those in a syncline or monocline exhibit poor productivity. (3) For the normally pressured shale gas reservoirs with poor caprock integrity, the enrichment and the commercial value of the gas depend mostly on the thickness of the WF2-LM4 graptolite zone. Therefore, we conclude that the areas near the core of synclines are more favorable and structurally stable, with relatively high formation pressure and moderate burial depths. Our findings can improve sweet spot prediction and offer valuable guidance for shale gas development in China and globally.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evolution History of Overpressured and Normally Pressured Shale Gas Reservoirs in Wufeng Formation–Longmaxi Formation, Sichuan Basin, China: An Analysis from the Perspective of Source and Seal Coupling Mechanism

Jin

Nie

2022

Energy Fuels

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“…The reservoir spaces of Antrim shale and Yangxin shale gas reservoirs in the Jiyang Depression are dominated by natural fractures, while the pores of shale in the Sanhu area are relatively developed (porosity can reach 10~35%) and the physical properties are better, which are more suitable for the formation of shale gas (Table 1) [16,17]. Therefore, the study and analysis of the formation conditions of biological shale gas reservoirs are of the most practical significance for the increase of natural gas reserves and production in the Qinghai Oilfield [18][19][20]. In view of the research on the geological conditions for the formation of shale biogas reservoirs, taking the shale of the Qigequan Formation of Quaternary in the Sanhu area as an example, the authors used TOC, nitrogen adsorption, high-pressure mercury injection, scanning electron microscopy, and other test methods to study the gas generation mechanism of methane bacteria, the distribution characteristics of organic matter components, and the development characteristics of shale reservoirs, and analyzed the control effect of gas generation conditions, reservoir conditions, stratigraphic structure characteristics, and hydrodynamic conditions on the formation of shale biogas reservoirs, providing a reference for the exploration and development of shale bio-gas in the Qaidam Basin and other areas.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Accumulation of the Quaternary Shale Biogas in Sanhu Area of the Qaidam Basin, China

Shao

Hou

et al. 2022

Energies

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Biogas resources in the Sanhu area of the Qaidam Basin have great potential, but there are few studies on biogas from shale, especially on the accumulation conditions of shale biogas. The study of biogas accumulation conditions of quaternary shale in the Sanhu area is of great significance to the theory of biogas accumulation and the guidance of exploration and development. This paper takes Quaternary shale in the Sanhu area as the research object. It is analyzed from multiple perspectives of shale hydrocarbon generation conditions, reservoir conditions, as well as hydrodynamic and structural conditions. Through the experiments of soluble organic carbon analysis and porosity and permeability analysis, the accumulation conditions of shale biogas reservoirs are clarified. The results show that the quaternary shale has a high soluble organic carbon content and high salinity formation water, which is conducive to late methane biochemical generation. Quaternary shale has the characteristics of high porosity and low permeability, mainly developing intergranular pores and intragranular pores. The large pore volume and specific surface area provide a lot of storage space for free gas and adsorbed gas, and the reservoir conditions are good. Under the structural characteristics of high in the south and low in the north and the action of formation hydrodynamics, biogas migrated from the south and deep to the north of the basin. The north slope is the main biogas-rich zone. On the whole, the quaternary shale in the Sanhu area has the characteristics of continuous hydrocarbon generation and dynamic accumulation, which has huge resource potential and exploration and development value.

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“…The reservoir spaces of Antrim shale and Yangxin shale gas reservoirs in Jiyang Depression are dominated by natural fractures, while the pores of shale in Sanhu area are relatively developed (porosity can reach 10%~35%) and the physical properties are better, which are more suitable for the formation of shale gas [16,17] . Therefore, the study and analysis of the formation conditions of biological shale gas reservoirs are of the most practical significance for the increase of natural gas reserves and production in Qinghai Oilfield [18,19,20] .…”

Section: Introductionmentioning

confidence: 99%

Dynamic Accumulation of the Quaternary Shale Biogas in Sanhu Area of the Qaidam Basin, China

Shao

Hou

et al. 2022

Preprint

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Biogas resources in Sanhu area of Qaidam Basin have great potential, but there are few researches on biogas of shale, especially on the accumulation conditions of shale biogas. The study of biogas accumulation conditions of quaternary shale in Sanhu area is of great significance to the theory of biogas accumulation and the guidance of exploration and development. This paper takes the quaternary shale in Sanhu area as the research object, through the experiment of soluble organic carbon analysis, pore permeability analysis and so on, analyzes the accumulation conditions of shale biological gas reservoir from the perspectives of hydrocarbon generation, reservoir conditions, hydrodynamic and structural conditions. The results show that the quaternary shale has high soluble organic carbon content and high salinity formation water, which is conducive to the late methane biochemical generation. Quaternary shale has the characteristics of high porosity and low permeability, mainly developing intergranular pores and intragranular pores. The large pore volume and specific surface area provide a lot of storage space for free gas and adsorbed gas, and the reservoir conditions are good. Under the structural characteristics of high in the south and low in the north and the action of formation hydrodynamics, biogas migrated from the south and deep to the north of the basin. The north slope is the main biogas rich zone. On the whole, the quaternary shale in Sanhu area has the characteristics of continuous hydrocarbon generation and dynamic accumulation, which has huge resource potential and exploration and development value.

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Distribution characteristics, exploration & development, geological theories research progress and exploration directions of shale gas in China

Cited by 19 publications

References 2 publications

Evolution History of Overpressured and Normally Pressured Shale Gas Reservoirs in Wufeng Formation–Longmaxi Formation, Sichuan Basin, China: An Analysis from the Perspective of Source and Seal Coupling Mechanism

Evolution History of Overpressured and Normally Pressured Shale Gas Reservoirs in Wufeng Formation–Longmaxi Formation, Sichuan Basin, China: An Analysis from the Perspective of Source and Seal Coupling Mechanism

Dynamic Accumulation of the Quaternary Shale Biogas in Sanhu Area of the Qaidam Basin, China

Dynamic Accumulation of the Quaternary Shale Biogas in Sanhu Area of the Qaidam Basin, China

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