Petroleum system for the continuous oil play in the lacustrine Lower Triassic, Junggar Basin, China

AAPG Bulletin ◽  
2021 ◽  
Vol 105 (12) ◽  
pp. 2349-2380
Author(s):  
Keyu Tao ◽  
Jian Cao ◽  
Wenxuan Hu ◽  
Dongming Zhi ◽  
Dewen Lei ◽  
...  
Keyword(s):  
Junggar Basin ◽  
Lower Triassic ◽  
Petroleum System

scholarly journals Feldspar Dissolution and Its Influence on Reservoirs: A Case Study of the Lower Triassic Baikouquan Formation in the Northwest Margin of the Junggar Basin, China

Geofluids ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-19 ◽  
Author(s):  
Meng Xiao ◽  
Xuanjun Yuan ◽  
Dawei Cheng ◽  
Songtao Wu ◽  
Zhenglin Cao ◽  
...  
Keyword(s):  
Clay Minerals ◽  
Physical Property ◽  
Junggar Basin ◽  
Sedimentary Facies ◽  
Lower Triassic ◽  
Depositional Environments ◽  
Source Rocks ◽  
Reservoir Quality ◽  
Delta Plain ◽  
Feldspar Dissolution

Feldspar dissolution is a common feature in clastic rock reservoirs of petroliferous basins and has an important influence on reservoir quality. However, the effect of feldspar dissolution on reservoir quality varies under different depositional environments and diagenetic systems. The study area in this paper is located in the Baikouquan Formation in the northwestern margin of the Junggar Basin, which is significantly influenced by feldspar dissolution. Based on the analyses of core and thin section observations, QEMSEM, XRD, SEM, CL, fluorescence, and image analysis software combined with logging and physical property data, this study shows that feldspar dissolution in the subaqueous distributary channel of a fan delta plain, which has good original physical properties and low mud contents, significantly improves the properties of the reservoir. The main reasons for this are as follows: (1) the sedimentary facies with good original properties and low mud content is a relatively open system in the burial stage. The acidic fluids needed for feldspar dissolution are mostly derived from organic acids associated with the source rocks and migrate to the good-permeability area of the reservoir; (2) the by-products of feldspar dissolution, such as authigenic clay minerals and authigenic quartz, are transported by pore water in a relatively open diagenetic system and then precipitated in a relatively closed diagenetic system; and (3) the clay minerals produced by feldspar dissolution in different diagenetic environments and diagenetic stages have different effects on the reservoir. When the kaolinite content is less than 3%, the illite content is less than 4%, and the chlorite content is less than 12%, the clay minerals have a positive effect on the porosity. These clay minerals can reduce porosity and block pore throats when their contents are larger than these values.

Recent exploration results in the Lower Triassic, Bedout Sub-basin: Australia's next petroleum province?

2018 ◽  
Vol 58 (2) ◽  
pp. 871 ◽  
Author(s):  
Melissa Thompson ◽  
Fred Wehr ◽  
Jack Woodward ◽  
Jon Minken ◽  
Gino D'Orazio ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Lower Triassic ◽  
Effective Porosity ◽  
Petroleum System ◽  
Source Rocks ◽  
Commercial Development ◽  
North West ◽  
The North ◽  
Productive Potential ◽  
Detailed Interpretation

Commencing in 2014, Quadrant Energy and partners have undertaken an active exploration program in the Bedout Sub-basin with a 100% success rate, discovering four hydrocarbon accumulations with four wells. The primary exploration target in the basin, the Middle Triassic Lower Keraudren Formation, encompasses the reservoirs, source rocks and seals that have trapped hydrocarbons in a self-contained petroleum system. This petroleum system is older than the traditional plays on the North-West Shelf and before recent activity was very poorly understood and easily overlooked. Key reservoirs occur at burial depths of 3500–5500 m, deeper than many of the traditional plays on the North-West Shelf and exhibit variable reservoir quality. Oil and gas-condensate discovered in the first two wells, Phoenix South-1 and Roc-1, raised key questions on the preservation of effective porosity and productivity sufficient to support a commercial development. With the acquisition and detailed interpretation of 119 m of core over the Caley Member reservoir in Roc-2 and a successful drill stem test that was surface equipment constrained to 55 MMscf/d, the productive potential of this reservoir interval has been confirmed. The results of the exploration program to date, combined with acquisition of new 3D/2D seismic data, have enabled a deeper understanding of the potential of the Bedout Sub-basin. A detailed basin model has been developed and a large suite of prospects and leads are recognised across a family of hydrocarbon plays. Two key wells currently scheduled for 2018 (Phoenix South-3 and Dorado-1) will provide critical information about the scale of this opportunity.

scholarly journals Geochemical evidence for a new Triassic petroleum system on the western margin of Australia

2021 ◽  
Vol 61 (2) ◽  
pp. 616
Author(s):  
Emmanuelle Grosjean ◽  
Dianne S. Edwards ◽  
Nadege Rollet ◽  
Christopher J. Boreham ◽  
Duy Nguyen ◽  
...  
Keyword(s):  
Middle Triassic ◽  
Lower Triassic ◽  
Petroleum System ◽  
Source Rocks ◽  
Type Ii ◽  
North West ◽  
Oil Resources ◽  
Isotopic Analyses ◽  
Potential Trap ◽  
The Phoenix

The unexpected discovery of oil in Triassic sedimentary rocks of the Phoenix South 1 well on Australia’s North West Shelf (NWS) has catalysed exploration interest in pre-Jurassic plays in the region. Subsequent neighbouring wells Roc 1–2, Phoenix South 2–3 and Dorado 1–3 drilled between 2015 and 2019 penetrated gas and/or oil columns, with the Dorado field containing one of the largest oil resources found in Australia in three decades. This study aims to understand the source of the oils and gases of the greater Phoenix area, Bedout Sub-basin using a multiparameter geochemical approach. Isotopic analyses combined with biomarker data confirm that these fluids represent a new Triassic petroleum system on the NWS unrelated to the Lower Triassic Hovea Member petroleum system of the Perth Basin. The Bedout Sub-basin fluids were generated from source rocks deposited in paralic environments with mixed type II/III kerogen, with lagoonal organofacies exhibiting excellent liquids potential. The Roc 1–2 gases and the Phoenix South 1 oil are likely sourced proximally by Lower–Middle Triassic TR10–TR15 sequences. Loss of gas within the Phoenix South 1 fluid due to potential trap breach has resulted in the formation of in-place oil. These discoveries are testament to new hydrocarbon plays within the Lower–Middle Triassic succession on the NWS.

Sedimentology and sequence stratigraphy of a retrogradational fan-delta system within Lower Triassic in the Mabei area, Junggar Basin ( northwestern China )

2018 ◽  
Vol 59 (6) ◽  
pp. 606-619 ◽  
Author(s):  
B. Peng ◽  
Z. Jin ◽  
J. Wang ◽  
H. Jia ◽  
X. Zhu ◽  
...  
Keyword(s):  
Sequence Stratigraphy ◽  
Junggar Basin ◽  
Lower Triassic ◽  
Northwestern China ◽  
Fan Delta ◽  
Delta System

scholarly journals Accumulation mechanism and controlling factors of the continuous hydrocarbon plays in the Lower Triassic Baikouquan Formation of the Mahu Sag, Junggar Basin, China

2016 ◽  
Vol 1 (4) ◽  
pp. 309-318 ◽  
Author(s):  
Ablimit Imin ◽  
Yong Tang ◽  
Jian Cao ◽  
Gangqiang Chen ◽  
Jing Chen ◽  
...  
Keyword(s):  
Junggar Basin ◽  
Lower Triassic ◽  
Controlling Factors ◽  
Accumulation Mechanism

Hydrocarbon migration in the multiple-sourced petroleum system in the northwestern Junggar Basin (northwestern China): Constraint from geochemical and phase fractionation analysis

AAPG Bulletin ◽  
2019 ◽  
Vol 103 (9) ◽  
pp. 2247-2284 ◽  
Author(s):  
Aiguo Wang ◽  
Zhenliang Wang ◽  
Long Li ◽  
Changyu Fan ◽  
Kuaile Zhang ◽  
...  
Keyword(s):  
Junggar Basin ◽  
Petroleum System ◽  
Northwestern China ◽  
Hydrocarbon Migration ◽  
Fractionation Analysis

The Permian hybrid petroleum system in the northwest margin of the Junggar Basin, northwest China

2005 ◽  
Vol 22 (3) ◽  
pp. 331-349 ◽  
Author(s):  
Jian Cao ◽  
Yijie Zhang ◽  
Wenxuan Hu ◽  
Suping Yao ◽  
Xulong Wang ◽  
...  
Keyword(s):  
Junggar Basin ◽  
Northwest China ◽  
Petroleum System

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

2020 ◽  
Author(s):  
Kun Yang ◽  
Diao Zhou ◽  
Bo Yang ◽  
Jingshu Tong ◽  
Shuai Luo ◽  
...  
Keyword(s):  
Junggar Basin ◽  
Lower Triassic ◽  
Controlling Factors ◽  
Nw China ◽  
Depositional Evolution
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