Oil & Gas Geology ›› 2018, Vol. 39 ›› Issue (5): 907-917.doi: 10.11743/ogg20180506

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Structural evolution and hydrocarbon accumulation in the eastern Junggar Basin

Zheng Menglin, Tian Aijun, Yang Tongyuan, He Wenjun, Chen Lei, Wu Haisheng, Ding Jing   

  1. Research Institute of Exploration and Development of Xinjiang Oilfield Company Ltd., PetroChina, Karamay, Xinjiang 834000, China
  • Received:2018-05-15 Revised:2018-07-19 Online:2018-10-28 Published:2018-09-06

Abstract: Surface geology,seismic and drilling data in combination with the research progress of orogenic belt in the Junggar Basin and its periphery were used to comprehensively study the structural deformation and its superinposition in the eastern Junggar Basin.The results show that the structural deformation in the study area is characterized by N-S zonation,E-W partition and multi-stage superinposition.From the south to the north,there are three major tectonic deformation regions of the Bogda front,the eastern uplift of the basin and the Kolameili front.To go a step further,the eastern uplift can be subdivided into three major structural deformation zones along N-S direction:the northern zone consists of a set of NE-trending anticlines and synclines;the central part is the NWW-trending paleo-uplifts;and the southern part is a nearly SN-trending structure controlled by early structures,forming a combination of imbricate folds and faults.The area has undergone multi-stage tectonic deformation such as the Carboniferous extensional faulted depression and SN-trending compressional deformation,the Mesozoic compressional strike-slip and the Cenozoic SN-trending compression.It contains varying patterns of structural deformation,such as compression,strike-slip,thrust nappe and kink-band,and chronologically,can be divided into six major tectonic evolution stages.Through the research of discovered oil and gas reservoirs,we considered that the factors controlling the distribution of oil and gas are structural deformation differences,multi-stage superimposed paleo-bulges,unconformities and faults.

Key words: strike-skip fault, thrust nappe, structural deformation, paleo-bulge, unconformity, superimposed evolution, petroleum accumulation, Junggar Basin

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