Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (2): 44-50.doi: 10.3969/j.issn.1673-8926.2017.02.006

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Structural characteristics of the boundary fault and its control on hydrocarbon accumulation in Saihantala Sag, Erlian Basin

XIAO Yang1, ZHANG Shaohua2,3, WEI Yan1, YANG Minghui2,4, CHEN Yuting1, PAN Juan1   

  1. 1. Geophysical Exploration Research Institute, PetroChina Huabei Oilfield Company, Renqiu 062552, Hebei, China;
    2. College of Geosciences, China University of Petroleum, Beijing 102249, China;
    3. State Key Laboratory of Continental Dynamics, Northwest University, Xi'an 710069, China;
    4. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
  • Received:2016-12-12 Revised:2017-02-11 Online:2017-03-21 Published:2017-03-21

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Abstract: Xilin fault is the boundary fault of Saihantala Sag,which controls origin,evolution and hydrocarbon accumulation of Saihantala Sag. Based on seismic and well data,the structural characteristics of Xilin fault were analyzed, and its control on hydrocarbon accumulation was discussed. The results show that the Xilin fault is a listric fault in profile and it consists of three segments. The southern and northern segments are low dip,while the central segment is steepened. The mean active rate indicates that Xilin fault had a strong activity during the sedimentary period of A'ershan Formation and Tengge'er Formation. The evolution of Xilin fault controls the reservoir accumulation,which can be proven by:(1)Xilin fault played an important role on the formation of hydro carbon generating depression and the accumulation of high-quality source rocks,and it also promoted the maturity of source rocks;(2)the evolution of Xilin fault has a great influence on palaeogeomorphology and the distribution of sand bodies,which dominated the formation of varied traps;(3)faults,sand bodies and unconformity surfaces constituted the hydrocarbon drainage system together. Therefore,the traps controlled by Xilin fault around the source depression are favorable for hydrocarbon accumulation.

CLC Number: 

  • P618.13
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