Distribution and formation of tight oil in Qijia area, Songliao Basin, NE China

Shi, Lizhi; Wang, Zhuozhuo; Zhang, Ge; Zhang, Yongsheng; Xing, Enyuan

doi:10.1016/s1876-3804(15)60005-2

Cited by 29 publications

(11 citation statements)

References 2 publications

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“…Contributing to the worldwide growth in production of unconventional oil and gas, tight oil has also been discovered in the sandstones of the second and third members of the Qingshankou Formation (K 2 qn 2+3 ) in the Songliao Basin (Shi et al, 2015). The Qingshankou Formation contains shale oil layers with high TOC and high oil yield near the base of its first (lower) member (K 2 qn 1 ; Feng et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…For this reason, over the past two decades, highresolution studies of the potential for hydrocarbon generation and the reconstruction of paleoenvironmental changes have been undertaken (Zhou and Littke, 1999;Jia et al, 2013b;Xu et al, 2015). In recent years, excellent examples of shale oil potential from organic matter-rich shales of the first member of the Qingshankou Formation have caused researchers to focus on the reservoir characteristics of this lacustrine deep-water sedimentary sequence (Liu et al, 2014a;Shi et al, 2015). In the northern part of the Songliao Basin, the key factor affecting the potential of shale oil within deeply buried shales (>1700 m [>5600 ft]) is considered to be the heterogeneity of the lithofacies (Cao et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Lithofacies and depositional setting of a highly prospective lacustrine shale oil succession from the Upper Cretaceous Qingshankou Formation in the Gulong sag, northern Songliao Basin, northeast China

et al. 2019

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The lacustrine shale of the Upper Cretaceous Qingshankou Formation is the principal prospective unconventional target lithology, acting as source, reservoir, and seal. Lithofacies and associated storage capacity are two significant factors in shale oil prospectivity. This paper describes an investigation of the lower Qingshankou Formation lacustrine shale based on detailed description and analysis of cores, shale lithofacies characteristics, depositional setting, and stacking patterns.Seven lithofacies are recognized based on organic matter content, sedimentary structure, and mineralogy, all exhibiting rapid vertical and lateral changes controlled by the depositional setting and basin evolution. An overall trend from shallow-water to deep-water depositional environments is interpreted from the characteristics of the infilling sequences, characterized by increasing total organic carbon (TOC) and total clay content and decreasing layer thickness (i.e., from bedded to laminated then to massive sedimentary structures). Periods of deposition during shallowing cycles show a reverse trend in the sedimentary characteristics described above. The sedimentary rocks in the studied interval show three complete short-term cycles, each one containing progressive and regressive system tracts.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Lithofacies and depositional setting of a highly prospective lacustrine shale oil succession from the Upper Cretaceous Qingshankou Formation in the Gulong sag, northern Songliao Basin, northeast China

et al. 2019

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“…Internally, each of these subenvironments contains and comprise multiscalar sedimentary layers (beds) of typically 1–2 m in thickness. These sand intervals tend to be laterally extensive, with good continuity, and are sandwiched within mudstone interbeds vertically (Shi et al., 2015).…”

Section: Geological Backgroundmentioning

confidence: 99%

Evolution of Fractal Pore Structure in Sedimentary Rocks

Zhou

Wang

et al. 2022

Earth and Space Science

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Geological processes alter pore spaces over time, and their analysis can shed light on the dynamic fractal structure and fluid flow of rocks over time. This study presents experimental evidence to illustrate that the pore fractal structure evolves with sedimentation, carbonate cementation, clay growth, and dissolution. It examines, describes and characterizes a suite of core samples from the Gaotaizi oil layer of the second and third members of the Qingshankou Formation, Songliao Basin, China. The effects of mechanical compaction and other diagenesis effects on fractal pore structure on sedimentary rocks are discussed. A schematic diagram is proposed that describes the impacts of these diagenetic processes on fractal pore structure at the microscopic scale in sedimentary rocks. This work links the state of diagenetic alteration and fractal pore structure, which can guide practical applications such as predicting the permeability of sedimentary rocks.

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“…The reservoirs are located within the Qingshankou Formation in the G area of Songliao Basin, China, which has developed high-quality source rocks with a broad-range distribution and good continuity [52]. The target formation shows high oil saturation, light-oil characteristics, low ratio of movable water, and a thickness of 70-110 m. The porepressure range is 22-32 MPa, and the temperature is around 80°C [27].…”

Section: Reservoir Characteristicsmentioning

confidence: 99%

Elastic-Electrical Rock-Physics Template for the Characterization of Tight-Oil Reservoir Rocks

Pang¹,

Ba²,

Carcione

et al. 2021

Lithosphere

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Tight-oil reservoirs have low porosity and permeability, with microcracks, high clay content, and a complex structure resulting in strong heterogeneities and poor connectivity. Thus, it is a challenge to characterize this type of reservoir with a single geophysical methodology. We propose a dual-porosity-clay parallel network to establish an electrical model and the Hashin-Shtrikman and differential effective medium equations to model the elastic properties. Using these two models, we compute the rock properties as a function of saturation, clay content, and total and microcrack porosities. Moreover, a 3D elastic-electrical template, based on resistivity, acoustic impedance, and Poisson’s ratio, is built. Well-log data is used to calibrate the template. We collect rock samples and log data (from two wells) from the Songliao Basin (China) and analyze their microstructures by scanning electron microscopy. Then, we study the effects of porosity and clay content on the elastic and electrical properties and obtain a good agreement between the predictions, log interpretation, and actual production reports.

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Distribution and formation of tight oil in Qijia area, Songliao Basin, NE China

Cited by 29 publications

References 2 publications

Lithofacies and depositional setting of a highly prospective lacustrine shale oil succession from the Upper Cretaceous Qingshankou Formation in the Gulong sag, northern Songliao Basin, northeast China

Lithofacies and depositional setting of a highly prospective lacustrine shale oil succession from the Upper Cretaceous Qingshankou Formation in the Gulong sag, northern Songliao Basin, northeast China

Evolution of Fractal Pore Structure in Sedimentary Rocks

Elastic-Electrical Rock-Physics Template for the Characterization of Tight-Oil Reservoir Rocks

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