Characterization and evaluation of shale lithofacies within the lowermost Longmaxi-Wufeng Formation in the Southeast Sichuan Basin

Wang, Ziyi; Chen, Lei; Chen, Dongxia; Lai, Jin; Deng, Gaoshan; Liu, Ziyi; Wang, Chao

doi:10.1016/j.petrol.2020.107353

Cited by 14 publications

(22 citation statements)

References 10 publications

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“…The control by the paleogeomorphology on the shale lithofacies may be related to the provenance system. The southeast and northwest areas are close to the provenance (Rong et al, 2003;Wang et al, 2020c). This led to large amounts of terrigenous siliceous materials coming from these two provenances, which formed high-silica shale together with biological silicon in the geomorphic highlands in the western and eastern areas.…”

Section: Paleogeomorphologymentioning

confidence: 95%

“…The Lower Silurian Longmaxi Formation is divided into the Long1 Member and Long2 Member. The Long1 Member is further divided into Long11 sub-member (Long11) and Long12 sub-member (Long12) (Zou et al, 2015;Wang et al, 2020c). Long11 is mainly composed of black and gray-black carbonaceous and siliceous shale, which is the target section for shale gas exploration in the Sichuan Basin and surrounding areas.…”

Section: Geological Settingmentioning

confidence: 99%

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Development Characteristics of Shale Lithofacies in the Longmaxi Formation and their Main Controlling Factors in the Changning Area, South Sichuan Basin, SW China

et al. 2021

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Based on core observations, thin sections, X-ray diffraction (XRD), and seismic data, the lithofacies types in the organic-rich Longmaxi shale (Lower Silurian) in the Changning area of the southern Sichuan Basin were identified. The factors controlling the spatial variations in the shale lithofacies and the influences of the shale lithofacies on shale gas development were also analyzed. Results indicate that there are seven main types of shale lithofacies in the Long11 sub-member of the Longmaxi Formation, including siliceous shale (S-1), mixed siliceous shale (S-2), carbonate-rich siliceous shale (S-3), clay-rich siliceous shale (S-4), carbonate/siliceous shale (M-1), mixed shale (M-2), and argillaceous/siliceous shale (M-4). A vertical transition from the carbonate shale association + mixed shale association at the bottom of the sub-member to a siliceous shale association and mixed shale association + siliceous shale at the top generally appears in the Long11 sub-member. The shale lithofacies of the Long11 sub-member also laterally change from the central depression (low-lying area) to the geomorphic highland in the east and west parts of the Changning area. The spatial variations in shale lithofacies in the Long11 sub-member of the Changning area were mainly controlled by palaeogeomorphology and relative sea level. The geomorphic highland area is dominated by carbonate-rich siliceous shale and mixed siliceous shale, but the depression (low-lying area) is mainly dominated by mixed siliceous shale and argillaceous/carbonate shale.

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Section: Paleogeomorphologymentioning

confidence: 95%

Section: Geological Settingmentioning

confidence: 99%

Development Characteristics of Shale Lithofacies in the Longmaxi Formation and their Main Controlling Factors in the Changning Area, South Sichuan Basin, SW China

et al. 2021

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“…Recently, the successful production of hydrocarbons from unconventional shale‐gas reservoirs in North America and Canada have brought a paradigm shift in the world energy landscape and initiated a number of detailed studies on these resources throughout the world (e.g. Chen et al, 2019; Iqbal et al, 2021; Jarvie, 2012; Kerschke & Schulz, 2015; Wang et al, 2020). Shale‐gas exploration and development in drilling technology enabled the United States to produce approximately 50% of its natural gas from shale‐gas reservoirs, and the trend is increasing in other parts of the world (e.g.…”

Section: Introductionmentioning

confidence: 99%

Depositional and diagenetic constraints on the quality of shale‐gas reservoirs: A case study from the Late Palaeocene of the Potwar Basin (Pakistan, Eastern Tethys)

et al. 2022

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Unconventional shale‐gas reservoir assessment concurs numerous exploration challenges, often related to their complex lithology, which reflects secular changes in depositional environment(s) as well as spatially variable diagenetic overprinting. This study combines a range of methods (sedimentological, petrographical, CL‐microscopy, X‐ray diffraction, TOC (total organic carbon), TON (total organic nitrogen) and δ13Corg and δ15Norg stable isotopes) to address the controls of lithofacies, palaeo‐depositional environment(s) and diagenesis on the shale‐gas reservoir potential of the Late Palaeocene Patala Formation in the Potwar Basin of Pakistan. This formation records sediment accumulation in a shallow, mixed siliciclastic‐carbonate shelf environment. Sedimentological and X‐ray diffraction (XRD) analyses show that the formation is primarily composed of an alternation of carbonaceous, siliceous, calcareous and argillaceous mudstone lithofacies. Detrital assemblages, including grains of quartz, apatite, calcite, chlorite, as well as organic matter (OM) and clay minerals with auxiliary (authigenic) pyrite, dominate the formation. High terrigenous influx is represented by the abundance of siliciclastics and terrigenous OM. The δ13Corg and δ15Norg proxies reflect dysoxic to anoxic palaeo‐environmental conditions, which promoted preservation of mixed marine and terrigenous OM, a setting considered to be indicative for high shale‐gas potential. The organic‐rich siliceous and carbonaceous mudstone lithofacies are considered to be the most prospective intervals, while calcareous and argillaceous mudstones are considered least promising in terms of reservoir quality. Spatially variable eo‐, meso‐ and telo‐diagenetic features such as compaction, cementation, stylolitization, dissolution and re‐precipitation are superimposed upon the depositional fabric, which locally affected the reservoir quality of the Patala Formation. The results of this study strongly suggest that the organic‐ and quartz‐rich mudstone lithofacies constitute “sweet spots” whose occurrence in space and time may be traced to design a strategy for shale‐gas exploration in the Potwar Basin of Pakistan and in analogous settings elsewhere.

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“…Hu et al (2019) determined three shale lithofacies, siliceous lithofacies, argillaceous lithofacies, and mixed lithofacies based on the shale mineral components, to discuss the effect of the lithofacies on the pore system of over-mature shales. Six lithofacies were identified with the combination of the three-end-member method and TOC, and shale lithofacies evaluation criteria were established (Wang et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…As the understanding of shale geology continues to deepen, shale color and mineral content, parameters such as paleontological type, grain size, organic matter type, and abundance, and sedimentary structure have also been applied to the lithofacies classification scheme (Dill et al, 2005;Liu et al, 2019). Since the development and distribution characteristics of different lithofacies have not been systematically explained, it will severely limit the exploration of shale oil (Wu et al, 2016;Ma et al, 2017Wang et al, 2020). To solve this problem, the author takes the second member of the Kongdian Formation (Ek 2 ) as the research object with the critical wells in the Cangdong Sag.…”

Section: Introductionmentioning

confidence: 99%

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Characterization and evaluation of shale lithofacies within the lowermost Longmaxi-Wufeng Formation in the Southeast Sichuan Basin

Cited by 14 publications

References 10 publications

Development Characteristics of Shale Lithofacies in the Longmaxi Formation and their Main Controlling Factors in the Changning Area, South Sichuan Basin, SW China

Development Characteristics of Shale Lithofacies in the Longmaxi Formation and their Main Controlling Factors in the Changning Area, South Sichuan Basin, SW China

Depositional and diagenetic constraints on the quality of shale‐gas reservoirs: A case study from the Late Palaeocene of the Potwar Basin (Pakistan, Eastern Tethys)

Table1.XLSX

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