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Sandbox Modeling of the Fault-increment Pattern in extensional basins

Petroleum Science 2007年第2期4卷 29-34页

作者： Geng Changbo Tong Hengmao He Yudan Wei Chunguang Key Laboratory for Hydrocarbon Accumulation Mechanism under Ministry of Education China University of Petroleum Beijing 102249 China CNPC International Research Center Beo＇ing 100083 China Key Laboratory of Coal Resources under Ministry of Education China University of Mining Technology Beijing 100083 China Sinopec International Petroleum Exploration ＆ Production Corporation Beijing 100083 China

Three series of sandbox modeling experiments were performed to study the fault-increment pattern in extensional basins. Experimental results showed that the tectonic action mode of boundaries and the shape of major boundary faults control the formation and evolution of faults in extensional basins. In the process of extensional deformation, the increase in the number and length of faults was episodic, and every ＇episode＇ experienced three periods, strain-accumulation period, quick fault-increment period and strain-adjustment period. The more complex the shape of the boundary fault, the higher the strain increment each ＇episode＇ experienced. Different extensional modes resulted in different fault-increment patterns. The horizontal detachment extensional mode has the ＇linear＇ style of fault-increment pattern, while the extensional mode controlled by a listric fault has the ＇stepwise＇ style of fault-increment pattern, and the extensional mode controlled by a ramp-flat boundary fault has the ＇stepwise-linear＇ style of fault-increment pattern. These fault-increment patterns given above could provide a theoretical method of fault interpretation and fracture prediction in extensional basins.

关键词： extensional basin sandbox modeling fault-increment pattern boundary fault

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Sequence architecture of a Jurassic ramp succession from Gebel Maghara(North Sinai,Egypt):Implications for eustasy

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Journal of Palaeogeography 2015年第3期4卷 305-330页

作者： Ahmed Awad Abdelhady Franz Theodor Fürsich Geology Department Faculty of ScienceMinia University FG Pal?oumwelt Geozentrum Nordbayern der Universit?t Erlangen

The Jurassic succession at Gebet Maghara, North Sinai, Egypt, represents a mixed carbonate-siticictastic sequence. Combining information from both fossits and rocks attowed a ptausibte reconstruction of the depositionat environments and of the basin evotution. The Ju- rassic succession of Gebel Maghara was deposited on a ramp, and the architecture of the ramp facies was strongty controtted not onty by sea-revel changes but atso by extensionat tectonics in connection with rifting of the Tethys, North Gondwana. Seven tectonicalty modified thirdorder sequences （DS 1-DS 7） have been recognized. The first three sequences （DS 1-DS 3）, ranging from the Toarcian to the Bajocian, record sea invasion （intertidat to shattow subtida[lconditions） across an intracratonic area as a resutt of eustatic sea-fever changes during a quiescent rift stage. The remaining sequences （DS 4-DS 7） reflect open marine mid to outer ramp settings. Non-marine conditions around the Bajocian-Bathonian boundary, documented by catiche, represent the maximum regression of the sea. During an active extensionat stage, horsts, which formerty acted as barriers separating the Maghara sub-basin from the main ocean, subsided. Subsequent rejuvenation and reactivation of fautts shifted the homoctinat physiography of the ramp to a distatty steepened ramp during the earty Bathonian, creating a 200-m-thick dettaic wedge. SimiLar processes during the earty Kimmeridgian created a catcirudite-catcarenite succession of stope origin. The diversity and the epifaunat/infaunat percentage of the macrofauna disptay a cyctic pattern which coincides more or tess with the sequence stratigraphic architecture.

关键词： facies sequence stratigraphy ramp extensional basin Jurassic Gebel Maghara Egypt

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Tectonic and Geodynamic Setting of Oil and Gas basins in China

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Journal of Earth Science 1995年第2期14卷 30-37页

作者： Chen Fajing Wang Xinwen Zhang Guangya Cao Shoulian Luo ChuanrongDepartment of Geology and Energy Resources, China University of Geosciences, Beijing 100083

About 26 sedimentary basins bearing oil and gas are developed in China. They can be classified into two main types . extensional basins and foreland basins . The former are chiefly distributed in the eastern part and the latter in the central and northwestern parts of the country . The present paper discusses the structural characteristics of these basins . including subsidence history , thermal history and structural style and kinematics . Combined with tectonic setting analysis of geophysical data and eruptive rocks , the geodynamic setting of the basins is established , and the formation mechanism of the basins is deduced to have been related to the subduction of the Izanagi and west Pacific plates and the closing of the Tethys ocean .

关键词： extensional basin foreland basin geodynamic setting .

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