Oil & Gas Geology ›› 2016, Vol. 37 ›› Issue (6): 862-873.doi: 10.11743/ogg20160608

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Hydrogeological-hydrogeochemical characteristics and hydrocarbon preservation conditions of the Qianbei Depression and its periphery,Upper Yangtze Block

Zhu Zhenhong1, Lou Zhanghua1, Jin Aimin1, Zhang Runhe2, Si Chunsong2, Yao Genshun2   

  1. 1. Ocean College, Zhejiang University, Zhoushan, Zhejiang 316021, China;
    2. Hangzhou Institute of Petroleum Geology, PetroChina Research Institute of Petroleum Exploration & Development, Hangzhou, Zhejiang 310023, China
  • Received:2015-08-12 Revised:2016-09-07 Online:2016-12-08 Published:2017-01-02

Abstract: The petroleum preservation conditions in the Qianbei depression and its periphery were studied based upon the analysis of groundwater hydrochemical and hydrodynamic characteristics.The results show that the Qianbei depression and its periphery experienced three hydrogeological cycles as follows:Caledonian epoch,Hercynian-Indosinian epoch,and Yanshan-Himalayan epoch.Caledonian epoch and Hercynian-Indosinian epoch are the two main periods of oil-gas reservoirs deposition,although these reservoirs were eroded almost completely during the period of Caledonian and Yanshan-Himalayan movements.The hydrocarbon preservation conditions of strata less than 2 500 meter depth below surface in the Qianzhong uplift and 3 000 meter depth below surface in the Qianbei depression are generally poor due to the multiple tectonic movements and meteoric water infiltrations.This zone with low mineralization formation water is named as free exchanging zone and its lower boundaries are still unclear.The strata deeper than 800 meter are regarded as an exchanging-inactive zone in the Chuannan depression and hydrocarbon preservation conditions thereby are relatively good.

Key words: hydrochemistry, hydrodynamics, hydrocarbon preservation, Qianbei Depression and its periphery, Upper Yangtze Block

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