Depositional environment, sequence stratigraphy and sedimentary mineralization mechanism in the coal bed- and oil shale-bearing succession: A case from the Paleogene Huangxian Basin of China

Lv, Dawei; Wang, Dongdong; Li, Zengxue; Liu, Haiyan

doi:10.1016/j.petrol.2016.09.028

Cited by 72 publications

(58 citation statements)

References 28 publications

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“…Sediments of the Carboniferous and Permian-Tertiary continental facies clastic rocks overly the early Cambrian metamorphic crystalline basement, which in turn are conformably overlain by the upper Paleozoic Benxi group, Taiyuan group, Shanxi group, and other land to sea transitional shales (Li et al, 2018;Lv et al, 2017). The National Shale Gas Resource Potential Assessment Project has involved studies on the Upper Paleozoic mud shale formation of the Ningwu Basin, which is considered to have good shale gas formation conditions (Sun et al,.…”

Section: Introduction and Methodologymentioning

confidence: 99%

Geology and transitional shale gas resource potentials in the Ningwu Basin, China

Xu²,

Jiang

et al. 2018

Energy Exploration & Exploitation

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We analyzed the tectonic evolution characteristics, sedimentary environment, geochemical characteristics, petrological characteristics, and gas-bearing properties of three mudstone sections of the Lower Paleozoic in Ningwu Basin, NE China, and determined the geologic characteristics and resource potential of the transitional facies shale gas. Geochemical analysis of the organic carbon content, kerogen macerals, and vitrinite reflectance of the shale samples showed that the total organic content was generally over 2.0%, the main organic type was type III, and the vitrinite reflectance values (Ro) were between 1.20 and 1.90%. Thus, the mudstones are good shale gas source rocks. The thickness of the three mudstone sections was approximately 30-70 m, and the average porosity was 3.10%. The pore types were diverse with good reservoir capacity. The shale gas resources of the Carboniferous-Permian transitional facies estimated by the volumetric method were approximately 2798.97 Â 10 8 -4643.09 Â 10 8 m 3. Through a comparison with shales in SW China, where shale gas has been successfully exploited, we determined the preferred criteria for favorable shale gas areas, as well as favorable areas for shale gas enrichment.

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Section: Introduction and Methodologymentioning

confidence: 99%

Geology and transitional shale gas resource potentials in the Ningwu Basin, China

Xu²,

Jiang

et al. 2018

Energy Exploration & Exploitation

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“…important effects on fracture development characteristics. This effect is mainly reflected in the mineral composition, rock brittleness, sedimentary facies, and paleo-tectonic stress environment Lai, Wang, Wang, Cao, Li, Pang, Zhou, et al, 2018b;Lv, Wang, Li, Liu, & Li, 2017;Sun, Zeng, Xia, Zhu, & Liu, 2017;Y. Wang, Zhu, Chen, & Li, 2014;Yin, Zhao, Wu, & Ding, 2018).…”

Section: Sedimentation Systems and Low-amplitude Structures Both Havementioning

confidence: 99%

“…Sedimentation systems and low‐amplitude structures both have important effects on fracture development characteristics. This effect is mainly reflected in the mineral composition, rock brittleness, sedimentary facies, and paleo‐tectonic stress environment (Han et al, ; Lai, Wang, Wang, Cao, Li, Pang, Zhou, et al, ; Lv, Wang, Li, Liu, & Li, ; Sun, Zeng, Xia, Zhu, & Liu, ; Y. Wang, Zhu, Chen, & Li, ; Yin, Zhao, Wu, & Ding, ). The study on the fracture development in low‐amplitude structural areas and the effects on the accumulation of tight sandstone gas is a hot and difficult spot in petroleum geology.…”

Section: Introductionmentioning

confidence: 99%

Developmental characteristics and distribution law of fractures in a tight sandstone reservoir in a low‐amplitude tectonic zone, eastern Ordos Basin, China

Yin

Tian²,

2019

Geological Journal

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In recent years, a large number of vertical and horizontal sliding fractures were found in the Upper Palaeozoic sandstones in the eastern margin of the Ordos Basin, China, However, the effect of fractures on the distribution of tight sandstone gas is still unclear. Therefore, in this paper, a large number of cores, thin sections, petrophysical property test results, conventional and FMI (Formation MicroScanner Image) image logs, and gas‐testing results were used to study the developmental characteristics of fractures and the gas control effects in a tight sandstone reservoir, in the eastern margin of the Ordos Basin. It was found that the average linear density of the core fractures is generally less than 2 m−1, and the microfractures are characterized as ruptures of quartz particles. The underlying Taiyuan and Benxi formations have the highest fracture development degrees, and the fracture index (FI) values are 0.68 and 0.72, respectively. However, the fracture development degrees in the overlying Shanxi to Shiqianfeng formations are significantly lower, and the FI values are generally less than 0.63. There is a good positive correlation between the fracture development degree and the contents of quartz mineral or brittle minerals (quartz + feldspar). On the whole, the fractures in the uplift and slope parts of the low‐amplitude structure areas are more developed, while in the depression zones, the fractures are generally less developed. The fractures in the Zijinshan Uplift area are extremely well developed; thus, the preservation conditions of the reservoir are poor. In this case, the fractures are unfavourable for the accumulation of natural gas. For the gentle tectonic zones, the over‐developed fractures in the Benxi and Taiyuan formations are unfavourable for the preservation of natural gas. However, the moderately developed fractures in the overlying Shanxi to Shiqianfeng formations are beneficial to the enrichment of natural gas. Finally, we compared the relationship between fracture index (FI) and open‐flow productivity of the gas wells, and it was found that FI values of commercial gas wells (Types I, II, and III gas wells) are generally greater than 0.55, while the FI values of Type IV low‐yield gas wells are generally less than 0.55.

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“…However, synthesis of coal accumulation in terms of sequence stratigraphy has not been widely undertaken in the Fuxin Basin. Sequence stratigraphy has been successfully applied to marine (Diessel, ; Holz, Kalkreuth, & Banerjee, ; Shen et al, ; Wang et al, ) and non‐marine successions (Aitken & Flint, ; Li, Shao, Lu, et al, ; Li, Shao, Eriksson, et al, ; Li et al, ; Lin et al, ; Lv, Wang, Li, Liu, & Li, ; Shanley & McCabe, ). Identification of sequence boundaries and the key sequence stratigraphic surfaces in basin interiors are commonly ambiguous, because of the influences of allocyclic and autocyclic processes on non‐marine successions, including palaeoclimate, tectonism, and avulsion deposits (Farrell, ; Shanley & McCabe, ).…”

Section: Introductionmentioning

confidence: 99%

Sequence palaeogeography, lacustrine basin evolution, and coal accumulation in the Lower Cretaceous Fuxin continental faulted basin, China

Shao

Yafei

et al. 2019

Geological Journal

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The Fuxin Basin is one of the major coal‐bearing basins in northeastern China with the coal seams mainly preserved in the Lower Cretaceous Fuxin Formation. The sequence stratigraphy, palaeogeography, basin evolution, and coal accumulation of the lacustrine coal‐bearing sequences in the Fuxin Formation were analysed based on borehole cores, well logs, and outcrop sections. Fifteen distinct lithofacies types were recognized with lithologies ranging from conglomerates, sandstones, siltstones, and mudstones to coals. Lithofacies are arranged into five facies associations representing alluvial fan, braided fluvial, meandering fluvial, fan delta, and lacustrine depositional systems. These facies associations collectively revealed a continental faulted basin setting. Based on the regional unconformities, basal scour surfaces of the incised valley fills sandstones, paleosols, or seat earths of coal seam on interfluves, and surfaces that mark abrupt depositional facies shifts, the Fuxin Formation was subdivided in two third‐order sequences. Palaeogeographic maps of each sequence have been reconstructed based on the contours of lithological parameters. The palaeogeographic units include alluvial fan, alluvial plain, channel (braided and meandering fluvial), fan delta, and lake. Preferred coal‐forming environments were mainly developed in the fan delta plain and fluvial back‐swamp. Compared with Sequence 1, the activity of basin‐margin faults and basement subsidence of the Sequence 2 gradually decreased, resulting in the lower rate of potential accommodation and less favourable conditions for peat accumulation. This background provided a basic understanding for the lacustrine basin evolution and coal accumulation. A six‐phase evolution model was proposed, which includes lowstand systems tract, early transgressive systems tract, late transgressive systems tract, early highstand systems tract, late highstand systems tract, and falling stage systems tract. The early and late TST of Sequence 1 and Sequence 2 were relatively beneficial stages for peat accumulation and coal development in the Fuxin Basin.

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Depositional environment, sequence stratigraphy and sedimentary mineralization mechanism in the coal bed- and oil shale-bearing succession: A case from the Paleogene Huangxian Basin of China

Cited by 72 publications

References 28 publications

Geology and transitional shale gas resource potentials in the Ningwu Basin, China

Geology and transitional shale gas resource potentials in the Ningwu Basin, China

Developmental characteristics and distribution law of fractures in a tight sandstone reservoir in a low‐amplitude tectonic zone, eastern Ordos Basin, China

Sequence palaeogeography, lacustrine basin evolution, and coal accumulation in the Lower Cretaceous Fuxin continental faulted basin, China

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