Architecture of strike-slip fault zones in the central Tarim Basin and implications for their control on petroleum systems

Wang, Ziyi; Gao, Zhiqian; Fan, Tingting; Zhang, Hehang; Yao, Yuying; Wei, Duan; Liu, Qi; Liu, Yun; Karubandika, Grace Muzee

doi:10.1016/j.petrol.2022.110432

Cited by 13 publications

(2 citation statements)

References 61 publications

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“…Faulting controls the accumulation of natural gas in many deeply buried strata. ,− For example, in the Upper Cretaceous Mesaverde Group in the Piceance Basin, Colorado, the long-term growth of a fault-related fracture system controls the charging of natural gas in tight sandstones. ,, The fault in the Xujiaweizi Depression, Songliao Basin, acts as a migration channel for the long-distance transport of natural gas into the Lower Cretaceous Shahezi Formation tight sandstone . The distribution of faults is particularly dense since the studied region is near the boundary of the basin (Figure a).…”

Section: Discussionmentioning

confidence: 99%

Characterizations of Middle–Lower Triassic Reservoir Quality and Gas Accumulations in the Northeastern Margin of the Ordos Basin, China

Wang

Liu

et al. 2023

Energy Fuels

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New Middle−Lower Triassic gas reservoirs were found in the eastern margin of the Ordos Basin, which provides new possibilities for gas exploration in the Ordos Basin. However, there are few relevant studies on these gas reservoirs. In this study, we use porosity−permeability measurements, optical light microscopy, scanning electron microscopy, mercury intrusion capillary pressure experiments, core-scale low-field nuclear magnetic resonance experiments, fluid inclusion analysis, burial history reconstruction, organic geochemistry data, and wireline log data to systematically investigate the reservoir quality and accumulation pattern of Middle−Lower Triassic gas reservoirs. The Middle−Lower Triassic sandstones are mostly lithic arkose, with a small amount of feldspathic litharenite. In comparison to the upper Paleozoic tight sandstone, the Middle−Lower Triassic sandstones exhibit a superior pore structure and increased porosity and permeability. A significant portion of the Middle−Lower Triassic sandstones can be referred to as "conventional sandstones" (porosities >12% and permeabilities >1 mD). The source rocks of the Middle−Lower Triassic gas reservoirs are most likely the upper Paleozoic coal and organic-rich mudstone, and the accumulation of natural gas occurred in the Early Jurassic to Late Cretaceous. The gas accumulation in the sandstones of the Middle−Lower Triassic reservoirs was mainly driven by buoyancy. The initiation and extension of vertical faults with small displacement in the northeast margin of the Ordos Basin enabled gas to move through the faults from the deep upper Paleozoic source rocks to the Middle−Lower Triassic reservoirs. Since gas accumulation relies on buoyancy, conventional sandstone layers with good reservoir properties are more likely to reach high gas saturation and are the primary targets for exploration and development.

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Section: Discussionmentioning

confidence: 99%

Characterizations of Middle–Lower Triassic Reservoir Quality and Gas Accumulations in the Northeastern Margin of the Ordos Basin, China

Wang

Liu

et al. 2023

Energy Fuels

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“…The study area is located in two structural units of the Bachu uplift and Maigaiti slope in the southwestern Tarim Basin, China, which is referred to as the Bamai area (Figure 1a). The Bamai area is bordered by the Keping uplift to the north; the northern depression and Tazhong uplift to the east; and the Kashi sag, Shache uplift, and Yecheng sag to the southwest [28][29][30][31]. The Carboniferous strata are one of the main subjects of oil and gas exploration in the Bamai area and contain the Bachu Formation, Karashayi Formation, and Xiaohaizi Formation from the bottom up.…”

Section: Geology Of the Study Basinmentioning

confidence: 99%

Growth and Distribution of Coal-Measure Source Rocks in Mixed Platform: A Case Study of Carboniferous in Bamai Area, Southwest Tarim Basin, China

Zhao²,

et al. 2022

Energies

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Coal-measure source rocks are generally developed in marsh facies under a humid climate and are rarely reported in a carbonate platform or a mixed platform. Carboniferous seawater intruded from west to east in the Tarim Basin, and mixed platform deposits of interbedded mudstone and carbonate developed in the southwest of the basin. In recent years, with the deepening of the exploration, nearly 20 m coal seams and carbonaceous mudstone source rocks have been found in the Carboniferous lagoon’s tidal-flat background. The hydrocarbon generation potential, development, and distribution of these coal-measure source rocks have become an important issue for oil and gas exploration. Coal seams and carbonaceous mudstones were found in the Carboniferous formation of wells BT5, BT10, and Lx2. The hydrocarbon prospect, development, and distribution characteristics of these coal formations have become an important research topic. The authors conducted organic geochemical tests and analyses of core and samples drill cuttings from multiple wells in the study area, combined with research focused on the identification and distribution of coal seams, dark mudstones, and depositional facies via logging cross plots of different lithology and 3D seismic inversion. The results show that coal-measure source rocks in the BT5 well are related to the set of delta-lagoon sedimentary systems widely developed in the Carboniferous Karashayi Formation. The maximum cumulative thickness of coal-measure source rocks is about 20 m, with total organic carbon (TOC) contents of 0.15–60%, kerogen types II2-III, and vitrinite reflectance (Ro) values of 0.78–1.65%. The rocks have generally low maturity in the northwestern area and high maturity in the southeastern area, and the maturity changes as the burial depth changes. The effective hydrocarbon source rocks such as coal, carbonaceous mudstone, and dark mudstone all show acoustic time (AC) greater than 300 µs/m, and density (DEN) less than 2.3 g/cm3, but possess different gamma ray (GR) values. The GR value is less than 75 API for coal, between 75–100 API for carbonaceous mudstone, and greater than 100 API for dark mudstones. The distribution of source rocks can be identified in the area between the wells according to a 3D seismic inversion impedance (IMP) of less than 7333 m/s·g/cm3. The development and controlled factors of coal-measure source rocks of delta facies in the mixed platform have a significant role for oil and gas exploration of Upper Paleozoic in this area. The coal measure and sandstones of delta in the Carboniferous are expected to form self-generation and self-storage pools in this area.

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Deep hydrocarbon genesis and accumulation model of strike-slip fault reservoirs in the Yuemanxi area of the Tarim Basin

ZHAO

et al. 2023

Environmental Research

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Architecture of strike-slip fault zones in the central Tarim Basin and implications for their control on petroleum systems

Cited by 13 publications

References 61 publications

Characterizations of Middle–Lower Triassic Reservoir Quality and Gas Accumulations in the Northeastern Margin of the Ordos Basin, China

Characterizations of Middle–Lower Triassic Reservoir Quality and Gas Accumulations in the Northeastern Margin of the Ordos Basin, China

Growth and Distribution of Coal-Measure Source Rocks in Mixed Platform: A Case Study of Carboniferous in Bamai Area, Southwest Tarim Basin, China

Deep hydrocarbon genesis and accumulation model of strike-slip fault reservoirs in the Yuemanxi area of the Tarim Basin

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