Application of Fluid Inclusion Technology to the Study of Hydrocarbon Charge History in Upper Triassic Reservoir of Chuanxi Foreland Basin, China

2011 ◽  
Vol 339 ◽  
pp. 517-520
Author(s):  
Hao Xu ◽  
Da Zhen Tang
Keyword(s):  
Structural Adjustment ◽  
Thermal Evolution ◽  
Foreland Basin ◽  
Upper Triassic ◽  
Tectonic Deformation ◽  
Burial History ◽  
Geologic History ◽  
Acid Dissolution ◽  
Abnormal Pressure ◽  
Hydrocarbon Charge

Comprehensive application of fluid inclusions data from the Upper Triassic reservoir of Chuanxi foreland basin in China, integrated with burial history and thermal evolution, indicates that there are four episodes of hydrocarbon charge during geologic history: early thermo-genetic oil stage, middle thermo-genetic oil stage, late thermo-genetic gas stage, structural adjustment charge stage. In every phrase of charge, four types of fractures origin from inflexible compaction, acid dissolution, breaking by abnormal pressure and tectonic deformation played a essential role in migration and accumulation of hydrocabon in the Upper Triassic reservoir of Chuanxi foreland basin.

scholarly journals Illite/smectite diagenesis and thermal evolution of Lower Cretaceous–Paleogene successions in the Dolna Kamchiya Depression, Eastern Bulgaria

2018 ◽  
Vol 47 (1) ◽  
pp. 3-21
Author(s):  
Yavor Stefanov
Keyword(s):  
Lower Cretaceous ◽  
Thermal Evolution ◽  
Clay Fraction ◽  
Foreland Basin ◽  
First Record ◽  
Burial History ◽  
X Ray Diffraction ◽  
Geological Age ◽  
Basin Subsidence ◽  
Cretaceous Deposits

The diagenesis of mixed-layer illite/smectite (I/S) minerals in Lower Cretaceous–Paleogene successions from the Dolna Kamchiya Depression was studied, using X-ray diffraction analysis of the clay fraction (<2 μm) from core samples. The proportion of illite in I/S and degree of ordering increase with depth irrespective of the geological age, indicating that highly expandable I/S compositions were progressively illitized during the burial evolution. Lowest smectite values are recorded in the Lower Cretaceous deposits, whereas in the Paleogene sections are documented great regional variations in the I/S mineralogy, caused by differential basin subsidence. The transition from randomly interstratified (R0) to R1-ordered I/S occurs between depths of 2200 m and 2400 m, and crosscuts the major stratigraphic boundaries. The variable patterns of I/S depth profiles resulted from the combined influence of temperature, burial history, sedimentation and subsidence rates, and basin geodynamic types on diagenesis. The rapid increase in illite content in the I/S clays across the main unconformities reflects the great thickness of eroded sediments during uplift and denudation events and/or elevated heat flow. The reconstructed palaeogeothermal gradient for the Eocene after corrections for decompaction and erosion would correspond to the values for foreland basin settings reported in the literature. Application of the I/S geothermometer to the Lower Cretaceous–Paleogene rocks demonstrates a general trend of increased organic maturity toward southeast in relatively isochronous deposits. The new results appear to be the first record for the effect of a multiphase basin evolution on the smectite illitization in sedimentary successions from the Dolna Kamchiya Depression.

scholarly journals Basement Structure and Styles of Active Tectonic Deformation in Central Interior Alaska

Geosciences ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 127
Author(s):  
Nilesh C. Dixit ◽  
Catherine Hanks
Keyword(s):  
Crustal Structure ◽  
Foreland Basin ◽  
Active Regions ◽  
Structural Features ◽  
Tectonic Deformation ◽  
Block Rotation ◽  
High Concentration ◽  
Intraplate Earthquakes ◽  
Interior Alaska ◽  
Nenana Basin

Central Interior Alaska is one of the most seismically active regions in North America, exhibiting a high concentration of intraplate earthquakes approximately 700 km away from the southern Alaska subduction zone. Seismological evidence suggests that intraplate seismicity in the region is not uniformly distributed, but concentrated in several discrete seismic zones, including the Nenana basin and the adjacent Tanana basin. Although the location and magnitude of the seismic activity in both basins are well defined by a network of seismic stations in the region, the tectonic controls on these intraplate earthquakes and the heterogeneous nature of Alaska’s continental interior remain poorly understood. We investigated the crustal structure of the Nenana and Tanana basins using available seismic reflection, aeromagnetic and gravity anomaly data, supplemented by geophysical well logs and outcrop data. We developed nine new two-dimensional forward models to delineate internal geometries and the crustal structure of Alaska’s interior. The results of our study demonstrates a strong crustal heterogeneity beneath both basins. The Tanana basin is a relatively shallow (up to 2 km) asymmetrical foreland basin with its southern, deeper side controlled by the northern foothills of the Central Alaska Range. Northeast-trending left lateral strike-slip faults within the Tanana basin are interpreted as a zone of clockwise crustal block rotation. The Nenana basin has a fundamentally different geometry. It is a deep (up to 8 km), narrow transtensional pull-apart basin that is deforming along the left-lateral Minto Fault. This study identifies two distinct modes of current tectonic deformation in Central Interior Alaska and provides a basis for modeling the interplay between intraplate stress fields and major structural features that potentially influence the generation of intraplate earthquakes in the region.

Linked sequence stratigraphy and tectonics in the Sichuan continental foreland basin, Upper Triassic Xujiahe Formation, southwest China

2014 ◽  
Vol 88 ◽  
pp. 116-136 ◽  
Author(s):  
Yingjiao Li ◽  
Longyi Shao ◽  
Kenneth A. Eriksson ◽  
Xin Tong ◽  
Caixia Gao ◽  
...  
Keyword(s):  
Sequence Stratigraphy ◽  
Southwest China ◽  
Foreland Basin ◽  
Upper Triassic ◽  
Xujiahe Formation

Post-orogenic exhumation in the western Pyrenees: evidence for extension driven by pre-orogenic inheritance

2020 ◽  
pp. jgs2020-079
Author(s):  
Charlotte Fillon ◽  
Frédéric Mouthereau ◽  
Sylvain Calassou ◽  
Raphaël Pik ◽  
Nicolas Bellahsen ◽  
...  
Keyword(s):  
Thermal Evolution ◽  
Foreland Basin ◽  
Normal Faulting ◽  
Axial Zone ◽  
Content Type ◽  
The North ◽  
Supplementary Material ◽  
Thermal Histories ◽  
Relationship Of ◽  
Western Pyrenees

We discuss the drivers of the Pyrenean post-orogenic exhumation, including drainage migration, flexural rebound and tectonic reactivation.We provide new low-temperature thermochronological data and inverse thermal modeling from both the hinterland and foreland of the western Pyrenees. Our new thermochronological ages range from 6.6 to 61.4 Ma and reveal a Late Miocene exhumation phase in several massifs. The contrasting thermal histories define a domain of focused exhumation in the western Pyrenees that coincides with the present-day extensional tectonics in a region to the north of the Axial Zone. Based on the inferred cooling rates and paleogradient estimates, we highlight an exhumation phase of c. 1 mm yr–1 between 11 and 9 Ma in the Axial Zone, well above rates expected for a post-orogenic evolution. The thermal evolution inferred from three boreholes of the Aquitaine foreland basin reveals that sediments eroded from the hinterland did not accumulate in the Piedmont region but were transported offshore in the Bay of Biscay. We infer that the significant c. 10 Ma post-orogenic exhumation event must be related to the modern normal faulting regime of the western Pyrenees, associated with contrasting crustal thickness and densities, inherited from the Mesozoic rift evolution of the northern Pyrenees.Supplementary material: Laboratory analytical procedures, radial plot visualization of AFT detrital data and Age/eU relationship of AHe and ZHe samples are available at https://doi.org/10.6084/m9.figshare.c.5212581

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