Oil & Gas Geology ›› 2007, Vol. 28 ›› Issue (2): 257-265.doi: 10.11743/ogg20070218

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The role of Che-Mo palaeohigh in controlling hydrocarbon accumulation in central Juggar basin

Jia Qingsu1, Yi Wei2, Chen Fajing3, Xiong Zuowei4   

  1. 1. China University of Geosciences, Beijing 100083;
    2. Sinopec Exploration and Producation Research Institute;Beijing 100083;
    3. Development Department of PetroChina Changqing Oil Company, Xi'an, Shanxi 710021
  • Received:2007-02-17 Online:2007-04-25 Published:2012-01-16

Abstract:

Che-Mo palaeohigh is a marginal uplift formed when Juggar basin was still a small intracontinental foreland depression in evolution during the Middle-Late Jurassic.Its formation and evolution can be divided into three main stages: growth(J2x-J3),burial(K-E),and disappearance(Nt-Q).The spatio-temporal configuration of the uplifts and hydrocarbon kitchens formed in different structural stages controlled the formation and distribution of hydrocarbon accumulations.And among the uplifts,Che-Mo palaeohigh played an important role in dominating the Mesozoic hydrocarbon accumulations in central Juggar basin in that the reservoirs came into being during the late J2x-J3,entered critical reservoiring period during the late K and the late E,and started adjustment during the late Nt-Q.It is concluded that the most prospective exploration target in Che-Mo palaeohigh shall be the Yongjin area in the south side of the uplift,while Sawodi and Zhuangdongbei in north part are regarded as the second best targets.

Key words: Che-Mo palaeohigh, controlling factor for hydrocarbon accumulation, central Juggar basin

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