Features of the fault system and its relationship with migration and accumulation of hydrocarbon in Liaodong Bay

Xu, Guoce; Ma, Ruimin; Gong, Daoyi; Zhou, Donghong; Li, Jianping; Guo, Yuqing; Yuan, Haifeng; Wu, Changrong

doi:10.1007/s12182-011-0142-0

Cited by 11 publications

(5 citation statements)

References 15 publications

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“…From the horizontal distribution of the formation pressures of the second member of the Shahejie Formation along the eighth and ninth survey lines, it can be seen that starting from the Liaoxi sag and the Liaodong sag to the direction of the Liaoxi salient, formation depth drops. The formation overpressure extent tends to decrease, which indicates that the oil and gas migrate and accumulate from the lateral sags to the Liaoxi salient by the driving of overpressure, which is in agreement with the research results of oil and gas migration and law of oil and gas field distribution (Xu et al., 2011). Along the seventh survey line the overpressure degree is relatively smaller, with only transitional overpressure being observed.…”

Section: Distribution Characteristics Of Formation Overpressuressupporting

confidence: 89%

Genetic mechanisms and distribution characteristics of overpressures in the Paleogene reservoirs of the Bohai Bay Basin, East China

Liang

et al. 2018

Energy Exploration & Exploitation

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The Bohai Bay region is a primary accumulation area of oil and gas in offshore China, in which overpressure commonly occurs in the Paleogene strata; the analysis on distribution characteristics and genetic mechanisms of the overpressure would provide geologic evidences for making plans of well drilling and logging as well as oil and gas exploitation; additionally, it could lay the geological foundation for studying how overpressure controlled hydrocarbon accumulation. Based on research, the overpressure of the study area starts from the second member of the Dongying Formation and ends in the third member of the Shahejie Formation. The distribution of overpressure is mainly controlled by the sag-salient tectonic framework within the basin, which means overpressure mainly develops in sags or slopes; however, high areas stay normal pressured. In the study area, pressure develops around Bozhong Sag and in northern Liaodong Bay reaches the peak. The genetic mechanisms of overpressures in the Paleogene reservoirs are mainly disequilibrium compaction, hydrocarbon generation of the organic matter, fluid charging, and transmission or the superimposition of the former two. Different strata have different genetic mechanisms of overpressure. The chief genetic mechanisms for the generation of overpressure of the Dongying Formation are disequilibrium compaction while the genesis of the formation of overpressure in the Shahejie Formation is more complicated in some extent. The first member of the Shahejie Formation dominated by disequilibrium compaction and hydrocarbon generation of the organic matter plays a supplemental role, while the second member of the Shahejie Formation, as the primary reservoir strata, is dominated by fluid charging and transmission, and the third member of the Shahejie Formation is the main source rock interval; its overpressure is closely related to hydrocarbon generation. Each contribution ratio for overpressure forming by

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Section: Distribution Characteristics Of Formation Overpressuressupporting

confidence: 89%

Genetic mechanisms and distribution characteristics of overpressures in the Paleogene reservoirs of the Bohai Bay Basin, East China

Liang

et al. 2018

Energy Exploration & Exploitation

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“…The studying of faults is of great importance to understand gas/fluid migration and accumulation systems in the subsurface (e.g. Hustoft et al, 2007;Judd and Hovland, 2007;Tryon et al, 2010;Xu et al, 2011). The faults for gas migration in the Western High are handled as two classes;…”

Section: Faultsmentioning

confidence: 99%

Gas occurrence and shallow conduit systems in the Western Sea of Marmara: a review and new acoustic evidence

et al. 2018

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Based on 3D and 2D high-resolution multichannel seismic reflection data in the Western High-Sea of Marmara, this study reviews shallow gas occurrence and related structures and classifies gas conduit systems within the upper, few hundred meter-thick sediment layers below the seafloor. Acoustic anomalies including high amplitude-reverse polarity reflections (bright spots), low amplitude transparent zones, chaotic or discontinuous reflections, pull-down effects, and plumes in the water column are interpreted in terms of natural gas occurrence and fluid flow structures (e.g., mud volcanoes, pockmarks). The gas occurrence is thought to be mostly of thermogenic origin. Mud volcanoes are one of the primary gas conduits forming craters on the seabed due to overpressure of fluidized gassy sediment flows. Following the reach of the Northern Branch of the North Anatolian Fault (NAF-N) to the Western High, the thermogenic fluids are believed to migrate vertically and horizontally to shallow depths mainly through the faults. Natural gas most probably originates from the Thrace Basin Eocene source rock or the Eocene-Oligocene reservoir rock, which extends below the Western High. Shallow gas is distributed by minor faults and gas pipes. Gas, to some extent, emanates from the seafloor via pockmarks and mud volcanoes or is trapped by the crests of the anticlines coinciding with erosional surfaces, impermeable sediments, and gas hydrate-bearing layers. Shallow traps below the tectonized "Western High" structure are likely located in thin layers of sands imbedded with impermeable silty clay layers. However, there is no shallow reservoir in the usual sense within the upper layers imaged by the 3D seismic data (< 300 ms two-way travel time). The existence of gas is an indicator of hydrocarbonrich layers at depth and of active tectonics, and it also impacts the global climate and marine life conditions.

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“…The oil-source correlation analysis shows that these oils were derived from the source rocks of the Es1 and Ed3 strata. Hydrocarbon migration and accumulation primarily occurred during the depositional period of the Ed and N + Q sequences (Xu et al, 2011;Wang et al, 2014;Teng et al, 2016). As one of the hydrocarbon-rich depressions in the Bohai Sea, the Liaodong Bay subbasin has witnessed discoveries of several large and medium oil and gas fields, such as LD27, LD21, and LD16.…”

Section: Implications For Hydrocarbon Exploration In the Southern Lia...mentioning

confidence: 99%

New Insights into the Distribution and Evolution of WNW-Directed Faults in the Liaodong Bay Subbasin of the Bohai Bay Basin, Eastern China

Meng

Zhang³

et al. 2022

Front. Earth Sci.

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WNW-directed faults are widespread in eastern China, but debates regarding their distributions and evolutionary processes remain unsettled. Based on the latest 3-D seismic data, a series of WNW-directed faults south of the Liaodong Bay subbasin was identified, for which the evolution and formation mechanisms were discussed. The results show that four WNW-directed faults are characterized by poor continuity and nearly parallel orientations. Vertically, they exhibit listric geometries and cut through Paleozoic and Mesozoic formations. Since the late Triassic, these faults began as reverse faults under nearly S-N horizontal compression. In the Jurassic, those faults maintained their reverse-faulting activities with dramatically decreased intensities. In the Early Cretaceous, the WNW-directed faults were changed into normal faults under regional extension and were influenced by the sinistral strike-slip movement along the Tan-Lu fault zone. In the Late Cretaceous, the WNW-directed normal faults probably stopped moving due to a regional compressional event. During the Paleogene, the WNW-directed faults were reactivated with decreased intensities and were cut by NNE-directed faults. Here, we emphasize that the evolution of the WNW-directed faults could shed light on the regional tectonics. The WNW-trending faults that developed in the Liaodong Bay subbasin are closely related to the faults in the Yanshan orogenic belt. Therefore, investigating the characteristics and origin of WNW-induced faults will provide evidence for the tectonic evolution of the North China Block. In addition, the development of WNW-directed faults in the southern Liaodong Bay subbasin was conducive to the formation of buried Mesozoic and Paleozoic hills and hydrocarbon accumulations. In addition, we suggest that the compressional segment of the conjugated strike-slip transition zone that was formed by the interaction of the WNW- and NNE-directed strike-slip faults was conducive to hydrocarbon accumulations.

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Features of the fault system and its relationship with migration and accumulation of hydrocarbon in Liaodong Bay

Cited by 11 publications

References 15 publications

Genetic mechanisms and distribution characteristics of overpressures in the Paleogene reservoirs of the Bohai Bay Basin, East China

Genetic mechanisms and distribution characteristics of overpressures in the Paleogene reservoirs of the Bohai Bay Basin, East China

Gas occurrence and shallow conduit systems in the Western Sea of Marmara: a review and new acoustic evidence

New Insights into the Distribution and Evolution of WNW-Directed Faults in the Liaodong Bay Subbasin of the Bohai Bay Basin, Eastern China

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