Microfacies characteristics and reservoir potential of Triassic Baikouquan Formation, northern Mahu Sag, Junggar Basin, NW China

Lü, Xianguo; Dong, Sun; Xie, Xiangyang; Chen, Xin; Zhang, Shuncun; Sun, Guoqiang; Shi, Jianrong

doi:10.1016/j.jnggs.2019.03.001

Cited by 16 publications

(7 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is located at the junction of Kazakhstan, Siberian, and Tarim Blocks (Figure 1B) (He et al, 2018). The basin is a late Paleozoic, Mesozoic, and Cenozoic superimposed basin (Cao et al, 2006;Zhang et al, 2010;Jin., 2011;Lu et al, 2019). The triangular Junggar Basin demonstrates an east-west extension, a width, and an area of ca.…”

Section: Geological Settingmentioning

confidence: 99%

Stratigraphic Characteristics and Sediment-Filling Process of the Early Permian Fengcheng Formation in the Northwestern Margin of the Junggar Basin, Northwest China

et al. 2022

View full text Add to dashboard Cite

The Permian Fengcheng Formation in the Mahu sag of the Junggar Basin is a crude oil reservoir and source rock. However, its stratigraphic characteristics, the boundary marks of the three members (lower, middle, and upper), and the sediment-filling processes are unclear. This study presents the sedimentary systems and sediment-filling processes in an intracontinental rift basin of this area using sedimentary-faces analysis, sequence stratigraphy, well logs, and two-dimensional seismic interpretations. The results show that the Fengcheng Formation consists of three third-order sequence stratigraphy (SQf1, SQf2, and SQf3). The lowest member of the Fengcheng Formation is composed of gray to dark gray thin middle layers of tuff, lacustrine dolomitic mudstone, and argillaceous dolomite near the depocenter. Tuff, siltstone, a small amount of fan–delta glutenite, volcanic breccia, and basalt are present near the fault zone. The logging curve is characterized by a high gamma-ray (GR) value, high amplitude, wavelength growth, and medium frequency. Near the depocenter, the middle member of the Fengcheng Formation comprises gray and gray–black thin layers of lacustrine muddy dolomite and dolomitic mudstone and thin sandstone and mudstone interbedded between tuff and gravel near the orogenic belt. The logging curve displays high-to-low GR values, high amplitude, short wavelength, and high frequency. The upper member of the Fengcheng Formation is not characterized by lesser tuffaceous and dolomitic components but by an increased fan–delta sandy content. Next, the bottom of the upper member is composed of lacustrine mudstone and siltstone interbedded between dolomitic mudstones; whereas, the top of the upper member is dominated by fan–delta coarse sandstone and sandy conglomerate. The logging curve shows low GR values, small amplitude, and continuous stability. The sediment-filling process of the Fengcheng Formation is controlled by fault activity. Overall, the lower and middle members of the Fengcheng Formation expand during the sediment-filling process of the lake basin of the Mahu sag; whereas, the upper member contracts. The strong uplift of the Horst near the Baiquan and Mahu orogenic belts led to an increase in provenance supply, resulting in a contraction of the southwestern margin of the lake basin during the sedimentation period from lower member to upper member of Fengcheng Formation.

show abstract

Section: Geological Settingmentioning

confidence: 99%

Stratigraphic Characteristics and Sediment-Filling Process of the Early Permian Fengcheng Formation in the Northwestern Margin of the Junggar Basin, Northwest China

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The grain size of conglomerates mostly includes pebble to cobble. The composition of thick conglomerates is complicated, with a mixture of volcanic rocks and clastic rocks (Lu et al, 2019). The conglomerates are commonly 4g).…”

Section: Distributary Channelmentioning

confidence: 99%

“…hydrocarbon resources, Mahu Sag has attracted intense investigation mainly from domestic scholars. Up to now, several giant oilfields have been discovered with significant petroleum reserves including the latest discovery of Mahu Conglomerate Oilfield in Baikouquan Formation (Lu et al, 2019;Meng et al, 2015;Peng et al, 2017). Previous studies have demonstrated that depositional evolution in fan delta systems is complex (Eberth et al, 2001;Li, Feng, Lu, & Hao, 2010).…”

mentioning

confidence: 99%

“…A great deal of previous studies were carried out to address academic issues in Baikouquan Formation in the northern slope of Mahu Sag regarding the tectonics (Chen, Lu, Shu, Wang, & Zhang, 2002;Chen, Wang, & Wang, 2005;He et al, 2004;He, Zhang, Wu, Li, & Zhen, 2018;He, Zhou, & Wu, 2012;Jahn et al, 2004;Yang, Song, & He, 2015), sequence stratigraphy and sedimentology (Eberth et al, 2001;Huang et al, 2015;Li et al, 2010;Liu et al, 2019;Lu et al, 2019;Ma et al, 2015;Meng et al, 2015;Peng et al, 2017;Yang et al, 2013), source rocks (Tan et al, 2017;Zhang et al, 2016;Zhu et al, 2019), and reservoir distribution and prediction (Chen et al, 2015;Kuang et al, 2017;Kuang, Tang, Lei, Wu, & Qu, 2014;Shan et al, 2017;Xiao et al, 2019). The focus in the study area change from tectonics and sedimentation to source rocks and reservoirs, which indicate that the transition of hydrocarbon exploration changes from macro view to micro view.…”

mentioning

confidence: 99%

See 1 more Smart Citation

The depositional evolution and controlling factors of the Lower Triassic Baikouquan Formation, Northern Mahu Slope, Junggar Basin, NW China

et al. 2020

View full text Add to dashboard Cite

Baikouquan Formation have been found in the last few years in Mahu Sag, Junggar Basin. Many studies have been conducted to describe the sedimentological complexity of reservoirs. However, few of them have been focused on the depositional characteristics and associated controlling factors in Baikouquan Formation. In this study, analysis of cores, thin sections, wireline logs, and seismic volume were carried out obtain detailed descriptions and interpretations of sedimentary microfacies, depositional evolution, and associated controlling factors. The results indicate that seven sedimentary microfacies are identified in Baikouquan Formation. Furthermore, depositional evolution of fan delta systems from bottom to top of Baikouquan Formation shows retrogradation in general. Tectonic activities along the northwestern fault zone, rising lake levels, arid climate, and high temperature together exert the controls on depositional evolution of fan delta systems in Baikouquan Formation.

show abstract

“…The reservoirs for the Triassic Baikouquan Formation in the slope of Mahu depression, NW Junggar Basin contain abundant oil and gas with proven geological reserves reached 110 million tons [10]. The reservoirs for the Baikouquan Formation are characterized by a highly nonuniform distribution, low porosity and permeability (porosity and permeability are generally between 7.5%-16% and 0.05-43.9 mD, respectively) [11]. Therefore, it is a big challenge to find high-quality oil and gas enriched reservoirs in the slope of Mahu depression, NW Junggar Basin.…”

Section: Introductionmentioning

confidence: 99%

Oilfield Water and Favorable Petroleum Exploration Targets for the Triassic Baikouquan Formation in the Slope of Mahu Depression, Junggar Basin

Tao

et al. 2021

Geofluids

View full text Add to dashboard Cite

In this paper, we attempt to clarify the relationships between oilfield water and hydrocarbon distribution of the Triassic Baikouquan Formation, in the slope zone of Mahu depression, Junggar Basin, NW China, based on oilfield water mineralization degrees, diagenesis analysis, formation pressure coefficients, burial history, and thermal evolution processes. The results show that the study area can be divided into four zones according to the mineralization degrees, that is, (1) zone I: NaHCO3 + Na2SO4 type water with residual intergranular pores, porosity usually higher than 10%. The strata of zone I are generally buried shallow and influenced by leaching from atmospheric precipitation. This area contains normal edge and bottom water and has normal formation pressure coefficients (average 1.12); (2) zone II: CaCl2 type water with mainly compaction diagenesis, porosity usually less than 7% and high formation pressure coefficients (average 1.41); (3) zone III: NaHCO3 + CaCl2 type oilfield water with mainly feldspar dissolution diagenesis, porosity usually greater than 9% and high formation pressure coefficients (average 1.53); and (4) zone IV: CaCl2 type water, mainly compacted diagenesis with a few intergranular and feldspar dissolved pores, and high formation pressure coefficients (average 1.58). The mineralization degrees of the oilfield water in zone II, III, and IV are relatively high. The appearance of NaHCO3 type water in the deeply buried areas is usually related to oil and gas charging. Therefore, within the strata, deeply-buried areas (e.g., zone III), where NaHCO3 type water has been developed, are favorable targets for oil and gas exploration.

show abstract

Microfacies characteristics and reservoir potential of Triassic Baikouquan Formation, northern Mahu Sag, Junggar Basin, NW China

Cited by 16 publications

References 5 publications

Stratigraphic Characteristics and Sediment-Filling Process of the Early Permian Fengcheng Formation in the Northwestern Margin of the Junggar Basin, Northwest China

Stratigraphic Characteristics and Sediment-Filling Process of the Early Permian Fengcheng Formation in the Northwestern Margin of the Junggar Basin, Northwest China

The depositional evolution and controlling factors of the Lower Triassic Baikouquan Formation, Northern Mahu Slope, Junggar Basin, NW China

Oilfield Water and Favorable Petroleum Exploration Targets for the Triassic Baikouquan Formation in the Slope of Mahu Depression, Junggar Basin

Contact Info

Product

Resources

About