Lithologic Reservoirs ›› 2015, Vol. 27 ›› Issue (2): 26-30.doi: 10.3969/j.issn.1673-8926.2015.02.005

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Migration systems and hydrocarbon accumulation models of buried hill reservoirs in Jizhong Depression

GAO Changhai1， ZHA Ming1， ZHAO Xianzheng2， PENG Pu3   

  1. 1. School of Geosciences ， China University of Petroleum ， Qingdao 266580 ， Shandong ， China ； 2. PetroChina Huabei Oilfield Company ， Renqiu 062552 ， Hebei ， China ； 3. Hekou Oil Production Plant ， Shengli Oilfield Company ，Sinopec ， Dongying 257200 ， Shandong ， China
  • Online:2015-03-03 Published:2015-03-03

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Abstract:

 The buried hills in Jizhong Depression are abundant in hydrocarbon which is characterized by multi-stage tectonic movements and complex reservoir heterogeneity. The exploration results in recent years indicate that the hydrocarbon migration system in buried hills has become the key factor restricting the exploration. Based on the analysis of structural framework, depositional filling and reservoir characteristics since Mesoproterozoic, it is determined that the hydrocarbon migration pathways of buried hills include fault, unconformity and carbonate reservoir. Among them, faults and unconformities serve as the main migration pathways and control simultaneously the hydrocarbon migration and accumulation with carbonate reservoirs. The assemblage types of hydrocarbon migration system are divided into fault-dominated, unconformity-dominated and fault-unconformity composite according to their functions. On this basis, the hydrocarbon accumulation models can be concluded into three types in combination with differences of zone distribution and structural features, including central uplift belt, fault step belt and ramp belt. The future exploration zones should be focused on the fault step belt and the ramp belt.

Key words:  water-soluble gas degasification, crucial period, Shaximiao Formation, Chengdu Depression

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