Microfracturing in the Upper Triassic Sichuan Basin tight-gas sandstones: Tectonic, overpressure, and diagenetic origins

Zeng, Lianbo

doi:10.1306/06301009191

Cited by 96 publications

(39 citation statements)

References 20 publications

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“…However, in practical exploration and development, more and more commercial gas flows have been found in shales, indicating that shale can act as a reservoir (Jarvie et al, 2007;Ross and Bustin, 2009;Kinley et al, 2009). Because shale reservoirs typically have low porosity and permeability, fractures play a vital role in the production of shale reservoirs (Nelson, 1985;John et al, 2002;Zeng, 2010). Fractures not only control the fluid flow property of the shale reservoirs but also affect the strategy of development (Corbett et al, 1987;Peggy and Michele, 2001;Zhang and Sanderson, 2002;Shedid, 2006;Ahr, 2008;Zeng and Li, 2009).…”

Section: Introductionmentioning

confidence: 99%

Fractures of lacustrine shale reservoirs, the Zhanhua Depression in the Bohai Bay Basin, eastern China

Jiu

Ding

Huang

et al. 2013

Marine and Petroleum Geology

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Section: Introductionmentioning

confidence: 99%

Fractures of lacustrine shale reservoirs, the Zhanhua Depression in the Bohai Bay Basin, eastern China

Jiu

Ding

Huang

et al. 2013

Marine and Petroleum Geology

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“…There are some open fractures not filled with cements (calcite and quartz) and have high dip angles or are horizontal (Figure 2). 4 Occasionally the bitumen can be found to be residued in the microfractures under microscopic observations ( Figure 3E,F). The opening-mode fractures in Figure 3 are nearly vertical, and F I G U R E 6 The orientation of the minimum horizontal stress (Shmin) determined from the borehole breakout (N1-4) the high-angle or vertical fractures will make a significant contribution in hydrocarbon production.…”

Section: Fracture Observationmentioning

confidence: 95%

In‐situ stress determination and fracture characterization using image logs: The Paleogene Dongying Formation in Nanpu Sag, Bohai Bay Basin, China

Niu

Liu

Lai

et al. 2019

Energy Science & Engineering

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Fracture detection and in‐situ stress determination via well logs are important for exploration and exploitation of subsurface hydrocarbons. Cores, thin sections, and image logs are used to describe and interpret the subsurface fractures and in‐situ stress in the Paleogene Dongying sandstones in Nanpu Sag, Bohai Bay Basin, China. The maximum horizontal stress (SHmax) indicates a nearly east‐west trend according to the borehole breakouts and drilling‐induced fractures. Natural fractures in the Dongying sandstones are classified into: (1) open fractures and (2) closed fractures. The cement‐filled (closed) fractures are commonly detected by image logs as bright discontinuous sinusoidal waves due to resistive filling materials, while the open fractures are evident on image logs appearing as dark sine waves. The open fractures are of dominantly high dip angles, and the rose diagrams confirm the presences of two sets of fractures: northwest‐southeast and northwest‐southeast orientation. Fractures with strikes approximately parallel to the SHmax have good connectedness, making a significant contribution in hydrocarbon production. In addition, the oil‐bearing layers are mainly associated with the intervals with open fractures. The presence of natural fractures provides important pore spaces and fluid flow conduits. Insights can be provided into the subsurface fracture (natural and induced) detection and characterization using image logs.

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“…Burial history, geotemperature history in the Upper Triassic Xujiahe Formation tight‐gas sandstones in Guang'an 13 well (modified after Zeng, ; Zhao, Wang, Xu, et al, ) [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Geological Settingmentioning

confidence: 99%

Diagenesis and reservoir quality in tight gas sandstones: The fourth member of the Upper Triassic Xujiahe Formation, Central Sichuan Basin, Southwest China

Lai

Wang

Cai³

et al. 2017

Geological Journal

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Mineralogical, petrographic, and geochemical analyses were performed to investigate the sandstone composition and texture, pore system, and diagenetic minerals of Upper Triassic sandstones in the Central Sichuan Basin, Southwest China. The results show that authigenic quartz, clay minerals, and carbonates are the main pore‐filling constituents. The pore systems consist of intergranular porosity, secondary porosity, microporosity, and microfractures. Loss of depositional porosity is greater due to compaction than to cementation. Eodiagenesis includes mechanical compaction, precipitation of early calcite cements, kaolinite, and smectite, and leaching of feldspars by meteoric water. Mesodiagenesis consists of compaction, framework grain dissolution, and subsequent precipitation of illite, quartz, and late carbonate cements. Six lithofacies were identified on the basis of petrographic analyses, namely, (a) argillaceous sandstones; (b) poorly sorted sandstones; (c) quartz‐cemented sandstones; (d) carbonate‐cemented sandstones; (e) clay‐mineral‐cemented sandstones, and (f) clean sandstones with abundant secondary porosity. The best reservoir‐quality rocks have high percentages of detrital quartz but low percentages of matrix, quartz, and carbonate cement. Differences in textural and compositional attributes of various lithofacies significantly affect porosity‐depth trends. The diagenetic evolution pathways and reservoir‐quality prediction models of various lithofacies are reconstructed by integrated petrographic data. This work provides insights into describing the different lithofacies by petrographic analysis and helps to investigate how detrital composition and texture influence the diagenesis and reservoir quality evolution in tight gas sandstones.

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Microfracturing in the Upper Triassic Sichuan Basin tight-gas sandstones: Tectonic, overpressure, and diagenetic origins

Cited by 96 publications

References 20 publications

Fractures of lacustrine shale reservoirs, the Zhanhua Depression in the Bohai Bay Basin, eastern China

Fractures of lacustrine shale reservoirs, the Zhanhua Depression in the Bohai Bay Basin, eastern China

In‐situ stress determination and fracture characterization using image logs: The Paleogene Dongying Formation in Nanpu Sag, Bohai Bay Basin, China

Diagenesis and reservoir quality in tight gas sandstones: The fourth member of the Upper Triassic Xujiahe Formation, Central Sichuan Basin, Southwest China

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