Genesis of heterogeneity in conglomerate reservoirs: insights from the Baikouquan formation of Mahu sag, in the Junggar Basin, China

He, Jiang; Tang, Huiying; Wang, Linsheng; Yang, Zhiying; Yong, Wang; Zhang, Xuyang; Hu, Qichao; Wan, Bingqian

doi:10.1080/10916466.2020.1830107

Cited by 8 publications

(7 citation statements)

References 9 publications

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“…3 P (χ 2 ): chi-square probability. 4 n: the number of confined fission tracks. 5 Dpar: the mean maximum diameter of etch figures parallel to the c-axis, which was used as a kinetic parameter.…”

Section: Thermal History 41 Sampling Strategy and Resultsmentioning

confidence: 99%

“…In recent years, some new oil and gas fields, which are characterized by lithologic reservoirs [2], were found in the depression areas of the Junggar Basin [3], such as the Mahu Sag, Fukang Sag, Shawan Sag, etc. The Fukang Sag in the central Junggar Basin represents a good exploration prospect along with the discovery of the KT1 oil well (Figure 1c) [4].…”

Section: Introductionmentioning

confidence: 99%

“…[13][14][15][16][17][18], but there is little research on the tectono-thermal evolution of the Fukang Sag with the combination of apatite fission track (AFT), apatite (U-Th)/He (AHe), and vitrinite reflectance (Ro) data [9]. [19]; (b) sketch of the tectonic unit divisions in the Junggar Basin [20]; (c) tectonic units of the Fukang Sag; (d) generalized stratigraphic column and the sample location (the red asterisk symbol) of the Fukang Sag [4]; (e,f) geologic cross sections of the Fukang Sag (the letters N, E, K, J, T, P, and C in the figure are the Neogene, Paleogene, Cretaceous, Jurassic, Triassic, Permian, and Carboniferous formations, respectively) [21], and the AA' and BB' represent the locations of geologic cross sections in the figure (c).…”

Section: Introductionmentioning

confidence: 99%

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Present-Day Geothermal Regime and Thermal Evolution of the Fukang Sag in the Junggar Basin, Northwest China

Guo,

Li,

Peng

et al. 2024

Minerals

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The Fukang Sag in the Junggar Basin is an important petroleum exploration and exploitation region. However, the geothermal regime and tectono-thermal evolution of the Fukang Sag, which control its hydrocarbon generation and conservation, are still controversial. This study involved a systematic analysis of the present-day geothermal gradient, heat flow, and thermal history of the Fukang Sag for better further exploration. According to the well log data and well-testing temperature data, we calculated that the geothermal gradient of the Fukang Sag ranges from 16.6 °C/km to 29.6 °C/km, with an average of 20.8 °C/km, and the heat flow ranges from 34.6 mWm−2 to 64.3 mWm−2, with an average of 44.6 mWm−2. Due to the basement relief, they decrease from northeast to southwest. The weight averages of the single-grain apatite (U-Th)/He ages of the core samples are 1.3–85.2 Ma, and their apatite fission track ages range from 50.9 Ma to 193.8 Ma. The thermal modeling results revealed that the Fukang Sag experienced late Permian, late Jurassic, and late Cretaceous cooling events (although the timing and magnitude of these events varied among the samples), which were related to the continuous compression of the Junggar Basin. In addition, basin modeling indicated that the heat flow of the Fukang Sag decreased from 80 mWm−2 in the Carboniferous to the current value of 44.6 mWm−2. The Fukang Sag’s edge exhibits prolific hydrocarbon generation in the Carboniferous–Permian source rocks, while the Jurassic source rocks within the sag also undergo abundant hydrocarbon generation. This study provides new insights into the present-day geothermal field and tectono-thermal evolutionary history of the Fukang Sag, which are significant in terms of regional tectonic evolution and oil and gas resource assessment.

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Section: Thermal History 41 Sampling Strategy and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Present-Day Geothermal Regime and Thermal Evolution of the Fukang Sag in the Junggar Basin, Northwest China

Guo,

Li,

Peng

et al. 2024

Minerals

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“…Diagenetic fractures are near-horizontal fractures generated via geological processes such as pressure solution, compaction, and pressure relief (He et al, 2011;Luo et al, 2017;Zeng et al, 2017). Diagenetic fractures in this study are predominantly bedding seams, with main occurrences at interfaces of bedding.…”

Section: Diagenetic Fracturesmentioning

confidence: 99%

Main controlling factors of natural fractures in tight reservoirs of the lucaogou formation in the jimsar sag, Xinjiang, China

et al. 2023

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Natural fractures act as critical flow channels and reservoir space in the Lucaogou Formation tight reservoir of the Jimsar Sag. It is essential to identify the main controlling factors of natural fractures in order to achieve efficient development of tight oil in this area. There are mainly three types of natural fractures, including tectonic fractures, diagenetic fractures, and abnormal overpressure-induced fractures. Diagenetic fractures are predominantly bedding seams. The fracture development is affected by multiple factors including brittle minerals, lithology, tectonic stress, bed thickness, and total organic carbon (TOC). Large tectonic stress, smaller bed thickness, and higher total organic carbon are all favorable for the development of tectonic fractures and bedding seams. The controls of brittle minerals and lithology on fracture development are different for tectonic fractures and bedding seams. Specifically, carbonate minerals stimulate the tectonic fracture development, while brittle minerals have no control over the bedding seam development; tectonic fractures are most developed in the dolomitic rocks, while bedding seams are most developed in the argillaceous rocks. The calculated fracture density variation coefficients reveal that tectonic stress and brittle minerals are the main controlling factors of tectonic fracture development; total organic carbon and lithology are the main control factors of bedding seam development.

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“…Data show that the geological reserves of glutenite reservoirs discovered in the Junggar Basin, Xinjiang, China, have reached 20 × 10 8 t . In addition, the effective exploration areas in the basin are also increasing. − Therefore, the effective development of glutenite reservoirs has great significance to alleviate the energy crisis. In the process of reservoir exploitation, hydraulic fracturing, water injection charging, and optimizing soak time are common means to improve the productivity of glutenite. − …”

Section: Introductionmentioning

confidence: 99%

Study on Imbibition Characteristics of Glutenite with Different Boundary Conditions Based on NMR Experiments

et al. 2022

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A glutenite reservoir is an important unconventional oil resource. However, there are few experimental studies on the imbibition of glutenite, and the imbibition laws with different boundary conditions are not clear. In addition, the one-end-closed (OEC) boundary condition has not received much attention. In this paper, an analytical balance and a nuclear magnetic resonance (NMR) analyzer are used as experimental instruments to monitor the spontaneous imbibition process of saturated oil glutenite in deuterium water, and the imbibition characteristics of glutenite with five different boundary conditions are studied. The T 2 spectra show that oil is mainly distributed in micropores and mesopores, and the signal amplitudes in the micropores decrease significantly. The micropores correspond to greater capillary force, and they are the main space for imbibition. The imbibed volume measured by the mass method is basically consistent with the area changes of T 2 spectra, and the imbibition curves conform to the Handy model. The imbibition rates with different boundary conditions are different, but their gap is acceptable. Among them, one-end-open (OEO) and two-ends-open (TEO) boundary conditions are slightly higher. Imbibition recovery is related to the exposed areas of the cores, and all-faces-open (AFO) is the boundary condition most conducive to recovery. The normalized recovery model can better scale the three boundary conditions of AFO, OEC, and two-ends-closed (TEC), but there is a certain error in the scaling of TEO and OEO of core end seepage. This research contributes to understanding the effects of boundary conditions on spontaneous imbibition, which is of significance for analyzing the soak mechanism of glutenite reservoirs.

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Genesis of heterogeneity in conglomerate reservoirs: insights from the Baikouquan formation of Mahu sag, in the Junggar Basin, China

Cited by 8 publications

References 9 publications

Present-Day Geothermal Regime and Thermal Evolution of the Fukang Sag in the Junggar Basin, Northwest China

Present-Day Geothermal Regime and Thermal Evolution of the Fukang Sag in the Junggar Basin, Northwest China

Main controlling factors of natural fractures in tight reservoirs of the lucaogou formation in the jimsar sag, Xinjiang, China

Study on Imbibition Characteristics of Glutenite with Different Boundary Conditions Based on NMR Experiments

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