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Characteristic Of Strike-slip Fault System And Entrapment Description In Zhuangxi Buried-hill, Jiyang Depression

Posted on:2012-06-17Degree:MasterType:Thesis
Country:ChinaCandidate:N N XingFull Text:PDF
GTID:2120330335453410Subject:Mineral prospecting and exploration
Abstract/Summary:PDF Full Text Request
This dissertation regards Zhuangxi Buried Hill as the object of the research, and analysis the characteristics of strike-slip fault structure and factors of control. It dissects structure's combination and style in connection with Zhuangxi Buried Hill strike-slip fault ,by using three dimensional seismic data and the way of coherent analysis. On this basis, it divides the type of entrapment of Zhuangxi Buried Hill Paleogene and confirms the area where it is advantageous for oil exploration.The results of the research shows that Zhuangxi Buried Hill strike-slip structure occurred in the period of Es3-Es2below, Es2above-Ed and Ng-Nm. According to attitude the strike-slip structure can be divided into nearly ns-trending strike-slip system and ne-trending strike-slip systemAt the precipitation period of Es3-Es2below,when Zhuangxi Buried Hill formed, due to the difference of elongation between Jiyang Depression and Bozhong Depression and the difference of fault's elongation at the transmeridional elongation, the fault of western Guzhuang engendered lots of different levels of nearly ns-trending strike-slip fault. On north-southern profile, the style of Zhuangxi Buried Hill is horst structure controlled by 2 groups of X fault, while on east-western it is nearly antiform controlled by nearly north-southern strike-slip fault. At the period of Es2above-Ed, when the affection of nearly north-southern strike-slip turn to be the affection of north-eastern strike-slip, nearly north-southern basement strike-slip continued motioning, but it had not been controlled by the earth's surface yet, with emerging lots of pinniform of T fault in the sedimentary stratum and having obvious progressive deformation. At the same time, due to the affection of Tanlu fault zone ,there are fresh two large north-eastern fault zone in the east and middle part of Zhuangxi Buried Hill, which render the mountain of Zhuangxi Buried Hill rise and turn to north-east. The tectonic regime formed during the period of Es2above-Ed was strengthened during the period of Ng-Nm and went into downwarpingregion of basin, with rifting weakening. At the same time, strike-slip fault continued being active, which make X pattern strengthened.There is self-similarity character in Zhuangxi Buried Hill strike-slip fault. Changdi fault, Gudong fault and Kendong fault are left-orderly en echelon array which is the highest level of en echelon R fault in the east part of Zhanhua. Under the affection of the whole fault system researched by using projective cover, there is fractal character, which is controlled by strike-slip fault, at the mountain of Zhuangxi Buried Hill.Sorts of structural combinations or styles relating to strike-slip structure can be recognized by synthesizing the relationship of Zhuangxi Buried Hill strike-slip and fault complex. Structural combinations or styles of Zhuangxi Buried Hill can be divided into three types, ten kinds in total. Plait structural combinations or styles, horsetail structural styles, S-shaped structural combinations or styles, comb structural combinations or styles and pinniform structural combinations or styles in the plane, camber structural combinations or styles, blühend structural combinations or styles and X-shaped structural combinations or styles in the profile and plane-profile riband and dolphin-shaped structural combinations or styles.Because the types of Zhuangxi Buried Hill Paleogene entrapment are multitudinous and same to type of oil-generated period, it is advantageous for oil exploration in the area. Entrapment mainly occurred during Himalayan, and was controlled by strike-slip fault, spread fault, thrust belt and sub-detachment fault. While the types of entrapment are X-shaped entrapment, anti-form entrapment and sub-detachment controlling entrapment. Due to succession of tectonic activity and sorts of structural combination, different types of entrapment can become mulriple entrapment. It is the most advantageous for oil exploration.
Keywords/Search Tags:Zhuangxi Buried Hill, Strike-slip Fault, Structural Styles, Entrapment, Fractal
PDF Full Text Request
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