A unique lacustrine mixed dolomitic-clastic sequence for tight oil reservoir within the middle Permian Lucaogou Formation of the Junggar Basin, NW China: Reservoir characteristics and origin

Wu, Haiwei; Hu, Wenxuan; Cao, Jian; Wang, Xiaolin; Wang, Xulong; Liao, Zhiwei

doi:10.1016/j.marpetgeo.2016.05.007

Cited by 83 publications

(49 citation statements)

References 47 publications

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“…Previous researches on the Lucaogou Formation have focused on reservoir geology (Kuang et al 2012;Gao et al 2016;Wu et al 2016;Zhao et al 2017;Cao et al 2016Cao et al , 2017Luo et al 2018;Su et al 2018). Thus, the bed type and architecture study here represents an unreported aspect.…”

Section: Bed Types and Flow Mechanisms Of Fan Fringe Facies In The Lumentioning

confidence: 97%

“…The Middle Permian Lucaogou Formation in the Junggar Basin of NW China was selected in this study, because it represents a sub-lacustrine fan fringe facies, and the deposits of which reveal the bed types, sedimentary sequences, and sedimentary processes of a fan fringe setting. Previous studies on the Lucaogou Formation have mainly focused on reservoir characteristics (Wu et al 2016;Zhao et al 2017;Su et al 2018) and the tight oil potential (Kuang et al 2012;Gao et al 2016;Cao et al 2016Cao et al , 2017Luo et al 2018). However, few studies focus on bed-scale investigations and the sedimentary processes that allow the formation of these beds.…”

Section: Introductionmentioning

confidence: 99%

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Bed type and flow mechanism of deep water sub-lacustrine fan fringe facies: an example from the Middle Permian Lucaogou Formation in Southern Junggar Basin of NW China

Shan

Jin

et al. 2020

Pet. Sci.

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Submarine or sub-lacustrine lobe deposits are important reservoirs, but the fan fringe deposits form heterogeneities within deep water fan deposits. Fan fringe facies records the complex sediment gravity flow types. By understanding of the bed types and flow mechanisms, we can identify the fan fringe deposit, which aids in the reconstruction of deep water fan and reservoir evaluations. The Jiucaiyuanzi and Dalongkou sections in the West Bogda Mountains preserve well-exposed 536-m and 171-m thick successions, respectively, of a deep water lacustrine depositional system from the Middle Permian Lucaogou Formation. Bed types of the Lucaogou Formation include high-density turbidite, low-density turbidite, incomplete Bouma-type turbidite, hybrid event beds, and slump deposits. The Lucaogou Formation is interpreted here as a fan fringe facies due to the thin bed thickness that characterize turbidites and hybrid event beds, as well as the predominance of the isolated sheet architecture. Previous studies suggest that these deposits were considered as deposited in a deep water setting due to the absence of wave-related structures. The presence of abundant mud clasts in massive medium-coarse grained sandstone beds reflects the significant erosional capability and interactions between high-density turbidity currents and lake floor. The fan fringe facies here contains amalgamated and thick-bedded homolithic facies (~ 30%) and thin-bedded heterolithic facies (~ 70%). The examination of the bed type is of wider significance for facies prediction and reservoir heterogeneity in the sub-lacustrine fan fringe facies.

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Section: Bed Types and Flow Mechanisms Of Fan Fringe Facies In The Lumentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Bed type and flow mechanism of deep water sub-lacustrine fan fringe facies: an example from the Middle Permian Lucaogou Formation in Southern Junggar Basin of NW China

Shan

Jin

et al. 2020

Pet. Sci.

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“…Considering the high formation temperature of 90–100°C, the formation of these calcite cements is suggested to be closely associated with the deep Permian source rocks. The Permian Lucaogou Formation in the southern Jimusaer Sag is an important tight oil reservoir in China (Wu et al., 2016). It is a dolomitic lacustrine sequence containing certain amounts of terrigenous sediments and tephra.…”

Section: Hydrocarbon-related Hot Fluidsmentioning

confidence: 99%

An overview of types and characterization of hot fluids associated with reservoir formation in petroliferous basins

Wang

Zhu

et al. 2018

Energy Exploration & Exploitation

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Increasing petroleum explorations indicate that the formation of many reservoirs is in close association with deep hot fluids, which can be subdivided into three groups including crust-derived hot fluid, hydrocarbon-related hot fluid, and mantle-derived hot fluid. The crustderived hot fluid mainly originates from deep old rocks or crystalline basement. It usually has higher temperature than the surrounding rocks and is characterized by hydrothermal mineral assemblages (e.g. fluorite, hydrothermal dolomite, and barite), positive Eu anomaly, low d 18 O value, and high 87 Sr/ 86 Sr ratio. Cambrian and Ordovician carbonate reservoirs in the central Tarim Basin, northwestern China serve as typical examples. The hydrocarbon-related hot fluid is rich in acidic components formed during the generation of hydrocarbons, such as organic acid and CO 2 , and has strong ability to dissolve alkaline minerals (e.g. calcite, dolomite, and alkaline feldspar). Extremely 13 C-depleted carbonate cements are indicative of the activities of such fluids. The activities of hydrocarbon-related hot fluids are distinct in the Eocene Wilcox Group of the Texas Gulf Coast, and the Permian Lucaogou Formation of the Jimusaer Sag and the Triassic Baikouquan Formation of the Mahu Sag in the Junggar Basin. The mantle-derived hot fluid comes from the upper mantle. The activities of mantle-derived hot fluids are common in the rift basins in eastern China, showing a close spatial relationship with deep faults. This type of hot fluid is

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“…15 C in Hackley et al 2016), and as sparry calcite in the Jimusar Sag, eastern Junggar Basin ( Fig. 9 A and B in Wu et al 2016;Fig. 4 G in Qiu et al 2016b), which have been interpreted as evaporative texture and gypsum pseudomorphs, respectively.…”

Section: Introductionmentioning

confidence: 98%

“…In the Erlian Basin, four types of fine-to-coarse dolomite, natrolite, analcime, and Fe-bearing magnesite in the lower Cretaceous are believed to be syn-sedimentary hydrothermal products in the Baiyinchagan Sag (Yang et al 2020). Moreover, some sparry calcite and pyrite in Lucaogou dark mudstones in the Santanghu and Junggar basins have been interpreted as evaporative gypsum pseudomorphs with a suspected hydrothermal origin (Hackley et al 2016;Qiu et al 2016a;Wu et al 2016). These cases indicate that many uncertainties and conflicting opinions remain on the identification of hydrothermal minerals and the explanation of their origins.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal mineral assemblages of calcite and dolomite–analcime–pyrite in Permian lacustrine Lucaogou mudstones, eastern Junggar Basin, Northwest China

et al. 2020

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The eastern Junggar Basin, controlled by continental extension (rift), was deposited by lacustrine dominated sediments during middle Permian Lucaogou period. An unusual porphyritic-like texture was observed in Lucaogou/Pingdiquan dark fine-grained organic-rich sediments in two sub-tectonic units in the basin. The “phenocrysts” are composed of two types of mineral assemblages. The first is a coarse euhedral calcite assemblage in the Jimusar Sag, and the second consists of dolomite, analcime, and pyrite in the Shishugou Sag. The lithological and mineralogical features indicate a hydrothermal origin for these phenocryst-like minerals. The chondrite-normalized rare earth element patterns show flat or positive Ce anomalies and negative Eu anomalies, which reflect a suboxic to anoxic, off-axis site from the center of the fault system, where the temperature of the hydrothermal fluid might be less than 250 °C. The high ratios of BaN/LaN at 1.6–65.5, strongly positive Sr anomalies at Sr/Sr* = 5.54–39.9, and relatively low 87Sr/86Sr isotopes at 0.705002–0.705776 in the coarse calcite suggest an origin of mixed sources of lake water, underlying biogenetic sediments, and deep magmatic water. However, the low 87Sr/ 86Sr ratios of 0.705321–0.705968 in the dolomite and δ34SV-CDT of 10.8‰–12.3‰ in the pyrite indicate that water–underlying-rock interaction and the abiotic thermochemical sulfate reduction of lake water or organic matter might have participated together resulting in the precipitation of the dolomite–analcime–pyrite assemblages in the Shishugou Sag.

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A unique lacustrine mixed dolomitic-clastic sequence for tight oil reservoir within the middle Permian Lucaogou Formation of the Junggar Basin, NW China: Reservoir characteristics and origin

Cited by 83 publications

References 47 publications

Bed type and flow mechanism of deep water sub-lacustrine fan fringe facies: an example from the Middle Permian Lucaogou Formation in Southern Junggar Basin of NW China

Bed type and flow mechanism of deep water sub-lacustrine fan fringe facies: an example from the Middle Permian Lucaogou Formation in Southern Junggar Basin of NW China

An overview of types and characterization of hot fluids associated with reservoir formation in petroliferous basins

Hydrothermal mineral assemblages of calcite and dolomite–analcime–pyrite in Permian lacustrine Lucaogou mudstones, eastern Junggar Basin, Northwest China

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