Geological characteristics and exploration of shale oil in Chang 7 Member of Triassic Yanchang Formation, Ordos Basin, NW China

Fu, Jinhua; Li, Shixiang; Niu, Xiaobing; Deng, Xiuqin; Zhou, Xinping

doi:10.1016/s1876-3804(20)60107-0

Cited by 109 publications

(39 citation statements)

References 6 publications

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“…From bottom to top, fluvial sand bodies are mainly composed of medium and coarse sandstones. Interbedded sandstones and mudstones represent a delta sedimentary system in the middle, and fluvial sandstone and mudstone deposits are found mainly in the upper part (Fu et al, 2020). The subsidence center of the lake basin is consistent with the depositional center; this area has the characteristics of long accumulation time, complete sequence structure, large thickness and wide distribution, and it represents the development stage of the main source rock and the large area of the superimposed reservoir in the basin (Wu et al, 2004).…”

Section: Geological Backgroundmentioning

confidence: 99%

“…In the study area, destructive diagenesis and constructive diagenesis occurred simultaneously. Xiao et al, 2005;Fu et al, 2020).…”

Section: Diagenetic Characteristicsmentioning

confidence: 99%

“…Affected by climate and frequent tectonic activity, the lake surface rose and fell alternately, and the alternation frequency was high, which is vertically manifested in the form of multicycle superposition. The depositional period of the Yanchang Formation in the Triassic experienced lake basin subsidence, depression, maximum lake surface to waning and extinction, which is a complete sedimentary cycle composed of transgressive and regressive sequences (Fu et al, 2020;Wu et al, 2004).…”

Section: Geological Backgroundmentioning

confidence: 99%

“…Figure 1. Geographical location map and stratigraphic histogram of the study area: (a) geographical location map of the study area; (b) stratigraphic histogram of the study area (Edited fromXiao et al, 2005;Fu et al, 2020).…”

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confidence: 99%

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A reservoir quality evaluation approach for tight sandstone reservoirs based on the gray correlation algorithm: A case study of the Chang 6 layer in the W area of the as oilfield, Ordos Basin

Liu

Zhang

Shi

et al. 2021

Energy Exploration & Exploitation

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As an important type of unconventional hydrocarbon, tight sandstone oil has great present and future resource potential. Reservoir quality evaluation is the basis of tight sandstone oil development. A comprehensive evaluation approach based on the gray correlation algorithm is established to effectively assess tight sandstone reservoir quality. Seven tight sandstone samples from the Chang 6 reservoir in the W area of the AS oilfield in the Ordos Basin are employed. First, the petrological and physical characteristics of the study area reservoir are briefly discussed through thin section observations, electron microscopy analysis, core physical property tests, and whole-rock and clay mineral content experiments. Second, the pore type, throat type and pore and throat combination characteristics are described from casting thin sections and scanning electron microscopy. Third, high-pressure mercury injection and nitrogen adsorption experiments are optimized to evaluate the characteristic parameters of pore throat distribution, micro- and nanopore throat frequency, permeability contribution and volume continuous distribution characteristics to quantitatively characterize the reservoir micro- and nanopores and throats. Then, the effective pore throat frequency specific gravity parameter of movable oil and the irreducible oil pore throat volume specific gravity parameter are introduced and combined with the reservoir physical properties, multipoint Brunauer-Emmett-Teller (BET) specific surface area, displacement pressure, maximum mercury saturation and mercury withdrawal efficiency parameters as the basic parameters for evaluation of tight sandstone reservoir quality. Finally, the weight coefficient of each parameter is calculated by the gray correlation method, and a reservoir comprehensive evaluation indicator (RCEI) is designed. The results show that the study area is dominated by types II and III tight sandstone reservoirs. In addition, the research method in this paper can be further extended to the evaluation of shale gas and other unconventional reservoirs after appropriate modification.

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Section: Geological Backgroundmentioning

confidence: 99%

“…In the study area, destructive diagenesis and constructive diagenesis occurred simultaneously. Xiao et al, 2005;Fu et al, 2020).…”

Section: Diagenetic Characteristicsmentioning

confidence: 99%

Section: Geological Backgroundmentioning

confidence: 99%

mentioning

confidence: 99%

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A reservoir quality evaluation approach for tight sandstone reservoirs based on the gray correlation algorithm: A case study of the Chang 6 layer in the W area of the as oilfield, Ordos Basin

Liu

Zhang

Shi

et al. 2021

Energy Exploration & Exploitation

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“…The Changqing Oilfield Company made a significant discovery in the Xin'anbian area of the central and western part of the basin in 2014. This represents the first tight field in China with over 100 million tons of proven reserves and highlights the significant exploration potential of the Chang 7 interval [55][56][57]. However, when compared with the central and western parts of the basin, no major discovery exists from exploration for tight oil in the southeast, with only occasional tight oil-enriched areas such as the Zhidan and the Ganquan.…”

Section: Introductionmentioning

confidence: 98%

The Lithological Features of Sublacustrine Fans and Significance to Hydrocarbon Exploration: A Case Study of the Chang 7 Interval of the Yanchang Formation, Southeastern Ordos Basin, North China

Yang

Shi

et al. 2021

Geofluids

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The Chang 7 interval of the Upper Triassic Yanchang Formation in the Ordos Basin represents a typical deep lacustrine depositional sequence. On the basis of field outcrops, cores, well logs, light/heavy mineral provenance analysis, and petrological studies, we evaluated the characteristics of deep-water gravity flow deposition of the Chang 7 interval and constructed a depositional model. The sediments mainly came from the northeast of the study area, and multiple sublacustrine fans were deposited in the center of the basin. Different from the deep-marine fan, the sublacustrine fan in the study area develops under the background of gentle slope without any erosional canyon between the fan and delta front. Gravity flow deposits in the study area can categorised into three groups: sand debris flow deposits, turbidity current deposits, and deep-water mudstone deposits. The main channel and branch channel are mainly developed with thick massive sandy debris sandstone, while the channel lateral margin and branch channel lateral margin are mainly developed with middle massive sandy debris sandstones and turbidite sandstones, which from bottom to top, the thickness of sand layer becomes thinner and the grain size becomes smaller. Thin mudstone is developed between channels; the lobe fringe includes sheet-like turbidite sandstones and deep lake mudstones. The widely distribute, good quality source rocks ( TOC = 2 % – 6 % ) developed in deep lacustrine have attained the peak stage of oil generation ( R o = 0.9 % – 1.2 % ). The superimposition of the sublacustrine fan sand bodies and the wide distribution of good quality source rocks favor the formation of large lithologic reservoirs characterized by source–reservoir integration, self-generation and self-storage, and near-source accumulation.

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Application of Intelligent Rodless Artificial Lift Technology in Shale Oil of Changqing Oilfield

Deng¹,

Chang²,

Zhou³

et al. 2023

Proceedings of the 2022 International Petroleum and Petrochemical Technology Conference

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Geological characteristics and exploration of shale oil in Chang 7 Member of Triassic Yanchang Formation, Ordos Basin, NW China

Cited by 109 publications

References 6 publications

A reservoir quality evaluation approach for tight sandstone reservoirs based on the gray correlation algorithm: A case study of the Chang 6 layer in the W area of the as oilfield, Ordos Basin

A reservoir quality evaluation approach for tight sandstone reservoirs based on the gray correlation algorithm: A case study of the Chang 6 layer in the W area of the as oilfield, Ordos Basin

The Lithological Features of Sublacustrine Fans and Significance to Hydrocarbon Exploration: A Case Study of the Chang 7 Interval of the Yanchang Formation, Southeastern Ordos Basin, North China

Application of Intelligent Rodless Artificial Lift Technology in Shale Oil of Changqing Oilfield

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